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esp-idf/components/usb/hcd.c

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// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string.h>
#include "sys/queue.h"
#include "esp_heap_caps.h"
#include "esp_intr_alloc.h"
#include "esp_timer.h"
#include "esp_err.h"
#include "esp_rom_gpio.h"
#include "hal/usbh_hal.h"
#include "soc/gpio_pins.h"
#include "soc/gpio_sig_map.h"
#include "driver/periph_ctrl.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "hcd.h"
// ----------------------------------------------------- Macros --------------------------------------------------------
// --------------------- Constants -------------------------
/**
* @brief Number of transfer descriptors per transfer for various transfer types
*
* Control: Requires 3 transfer descriptors for a single transfer
* corresponding to each stage of a control transfer
* Bulk: Requires 1 transfer descriptor for each transfer
*/
#define NUM_DESC_PER_XFER_CTRL 3
#define NUM_DESC_PER_XFER_BULK 1
#define XFER_LIST_LEN_CTRL 1
#define XFER_LIST_LEN_BULK 1
#define INIT_DELAY_MS 30 //A delay of at least 25ms to enter Host mode. Make it 30ms to be safe
#define DEBOUNCE_DELAY_MS 250 //A debounce delay of 250ms
#define RESET_HOLD_MS 30 //Spec requires at least 10ms. Make it 30ms to be safe
#define RESET_RECOVERY_MS 30 //Reset recovery delay of 10ms (make it 30 ms to be safe) to allow for connected device to recover (and for port enabled interrupt to occur)
#define RESUME_HOLD_MS 30 //Spec requires at least 20ms, Make it 30ms to be safe
#define RESUME_RECOVERY_MS 20 //Resume recovery of at least 10ms. Make it 20 ms to be safe. This will include the 3 LS bit times of the EOP
#define CTRL_EP_MAX_MPS_LS 8 //Largest Maximum Packet Size for Low Speed control endpoints
#define CTRL_EP_MAX_MPS_FS 64 //Largest Maximum Packet Size for Full Speed control endpoints
#define NUM_PORTS 1 //The controller only has one port.
typedef enum {
XFER_REQ_STATE_IDLE, //The transfer request is not enqueued
XFER_REQ_STATE_PENDING, //The transfer request is enqueued and pending execution
XFER_REQ_STATE_INFLIGHT, //The transfer request is currently being executed
XFER_REQ_STATE_DONE, //The transfer request has completed executed or is retired, and is waiting to be dequeued
} xfer_req_state_t;
// -------------------- Convenience ------------------------
#define HCD_ENTER_CRITICAL_ISR() portENTER_CRITICAL_ISR(&hcd_lock)
#define HCD_EXIT_CRITICAL_ISR() portEXIT_CRITICAL_ISR(&hcd_lock)
#define HCD_ENTER_CRITICAL() portENTER_CRITICAL(&hcd_lock)
#define HCD_EXIT_CRITICAL() portEXIT_CRITICAL(&hcd_lock)
#define HCD_CHECK(cond, ret_val) ({ \
if (!(cond)) { \
return (ret_val); \
} \
})
#define HCD_CHECK_FROM_CRIT(cond, ret_val) ({ \
if (!(cond)) { \
HCD_EXIT_CRITICAL(); \
return ret_val; \
} \
})
// ------------------------------------------------------ Types --------------------------------------------------------
typedef struct xfer_req_obj xfer_req_t;
typedef struct pipe_obj pipe_t;
typedef struct port_obj port_t;
/**
* @brief Object representing an HCD transfer request
*/
struct xfer_req_obj {
TAILQ_ENTRY(xfer_req_obj) tailq_entry; //TailQ entry for pending or done tailq in pipe object
pipe_t *pipe; //Target pipe of transfer request
usb_irp_t *irp; //Target IRP
void *context; //Context variable of transfer request
xfer_req_state_t state; //Current state of the transfer request
};
/**
* @brief Object representing a pipe in the HCD layer
*/
struct pipe_obj {
//Transfer requests related
TAILQ_HEAD(tailhead_xfer_req_pend, xfer_req_obj) pend_xfer_req_tailq;
TAILQ_HEAD(tailhead_xfer_req_done, xfer_req_obj) done_xfer_req_tailq;
int num_xfer_req_pending;
int num_xfer_req_done;
xfer_req_t *inflight_xfer_req; //Pointer to the current transfer request being executed by the pipe. NULL if none.
//Port related
port_t *port; //The port to which this pipe is routed through
TAILQ_ENTRY(pipe_obj) tailq_entry; //TailQ entry for port's list of pipes
//HAl channel related
void *xfer_desc_list;
usbh_hal_chan_t *chan_obj;
usbh_hal_ep_char_t ep_char;
//Pipe status, state, and events
hcd_pipe_state_t state;
hcd_pipe_event_t last_event;
TaskHandle_t task_waiting_pipe_notif; //Task handle used for internal pipe events
union {
struct {
uint32_t waiting_xfer_done: 1;
uint32_t paused: 1;
uint32_t pipe_cmd_processing: 1;
//Flags only used by control transfers
uint32_t ctrl_data_stg_in: 1;
uint32_t ctrl_data_stg_skip: 1;
uint32_t reserved3: 3;
uint32_t xfer_desc_list_len: 8;
uint32_t reserved16: 16;
};
uint32_t val;
} flags;
//Pipe callback and context
hcd_pipe_isr_callback_t callback;
void *callback_arg;
void *context;
};
/**
* @brief Object representing a port in the HCD layer
*/
struct port_obj {
usbh_hal_context_t *hal;
//Pipes routed through this port
TAILQ_HEAD(tailhead_pipes_idle, pipe_obj) pipes_idle_tailq;
TAILQ_HEAD(tailhead_pipes_queued, pipe_obj) pipes_queued_tailq;
int num_pipes_idle;
int num_pipes_queued;
//Port status, state, and events
hcd_port_state_t state;
usb_speed_t speed;
hcd_port_event_t last_event;
TaskHandle_t task_waiting_port_notif; //Task handle used for internal port events
union {
struct {
uint32_t event_pending: 1; //The port has an event that needs to be handled
uint32_t event_processing: 1; //The port is current processing (handling) an event
uint32_t cmd_processing: 1; //Used to indicate command handling is ongoing
uint32_t waiting_all_pipes_pause: 1; //Waiting for all pipes routed through this port to be paused
uint32_t disable_requested: 1;
uint32_t conn_devc_ena: 1; //Used to indicate the port is connected to a device that has been reset
uint32_t reserved10: 10;
uint32_t num_pipes_waiting_pause: 16;
};
uint32_t val;
} flags;
bool initialized;
//Port callback and context
hcd_port_isr_callback_t callback;
void *callback_arg;
SemaphoreHandle_t port_mux;
void *context;
};
/**
* @brief Object representing the HCD
*/
typedef struct {
//Ports (Hardware only has one)
port_t *port_obj;
intr_handle_t isr_hdl;
} hcd_obj_t;
static portMUX_TYPE hcd_lock = portMUX_INITIALIZER_UNLOCKED;
static hcd_obj_t *s_hcd_obj = NULL; //Note: "s_" is for the static pointer
// ------------------------------------------------- Forward Declare ---------------------------------------------------
// ----------------------- Events --------------------------
/**
* @brief Wait for an internal event from a port
*
* @note For each port, there can only be one thread/task waiting for an internal port event
* @note This function is blocking (will exit and re-enter the critical section to do so)
*
* @param port Port object
*/
static void _internal_port_event_wait(port_t *port);
/**
* @brief Notify (from an ISR context) the thread/task waiting for the internal port event
*
* @param port Port object
* @return true A yield is required
* @return false Whether a yield is required or not
*/
static bool _internal_port_event_notify_from_isr(port_t *port);
/**
* @brief Wait for an internal event from a particular pipe
*
* @note For each pipe, there can only be one thread/task waiting for an internal port event
* @note This function is blocking (will exit and re-enter the critical section to do so)
*
* @param pipe Pipe object
*/
static void _internal_pipe_event_wait(pipe_t *pipe);
/**
* @brief Notify (from an ISR context) the thread/task waiting for an internal pipe event
*
* @param pipe Pipe object
* @param from_isr Whether this is called from an ISR or not
* @return true A yield is required
* @return false Whether a yield is required or not. Always false when from_isr is also false
*/
static bool _internal_pipe_event_notify(pipe_t *pipe, bool from_isr);
// ------------------------ Port ---------------------------
/**
* @brief Invalidates all the pipes routed through a port
*
* This should be called when port or its connected device is no longer valid (e.g., the port is suddenly reset/disabled
* or the device suddenly disconnects)
*
* @note This function may run one or more callbacks, and will exit and enter the critical section to do so
*
* Entry:
* - The port or its connected device is no longer valid. This guarantees that none of the pipes will be transferring
* Exit:
* - Each pipe will have any pending transfer request moved to their respective done tailq
* - Each pipe will be put into the invalid state
* - Generate a HCD_PIPE_EVENT_INVALID event on each pipe and run their respective callbacks
*
* @param port Port object
*/
static void _port_invalidate_all_pipes(port_t *port);
/**
* @brief Pause all pipes routed through a port
*
* Call this before attempting to reset or suspend a port
*
* Entry:
* - The port is in the HCD_PORT_STATE_ENABLED state (i.e., there is a connected device which has been reset)
* Exit:
* - All pipes of the port have either paused, or are waiting to complete their inflight transfer request to pause
* - If waiting for one or more pipes, _internal_port_event_wait() must be called after this function returns
*
* @param port Port object
* @return true All pipes have been paused
* @return false Need to wait for one or more pipes to pause. Call _internal_port_event_wait() afterwards
*/
static bool _port_pause_all_pipes(port_t *port);
/**
* @brief Un-pause all pipes routed through a port
*
* Call this before after coming out of a port reset or resume.
*
* Entry:
* - The port is in the HCD_PORT_STATE_ENABLED state
* - All pipes are paused
* Exit:
* - All pipes un-paused. If those pipes have pending transfer requests, they will be started.
*
* @param port Port object
*/
static void _port_unpause_all_pipes(port_t *port);
/**
* @brief Send a reset condition on a port's bus
*
* Entry:
* - The port must be in the HCD_PORT_STATE_ENABLED or HCD_PORT_STATE_DISABLED state
* Exit:
* - Reset condition sent on the port's bus
*
* @note This function is blocking (will exit and re-enter the critical section to do so)
*
* @param port Port object
* @return true Reset condition successfully sent
* @return false Failed to send reset condition due to unexpected port state
*/
static bool _port_bus_reset(port_t *port);
/**
* @brief Send a suspend condition on a port's bus
*
* This function will first pause pipes routed through a port, and then send a suspend condition.
*
* Entry:
* - The port must be in the HCD_PORT_STATE_ENABLED state
* Exit:
* - All pipes paused and the port is put into the suspended state
*
* @note This function is blocking (will exit and re-enter the critical section to do so)
*
* @param port Port object
* @return true Suspend condition successfully sent. Port is now in the HCD_PORT_STATE_SUSPENDED state
* @return false Failed to send a suspend condition due to unexpected port state
*/
static bool _port_bus_suspend(port_t *port);
/**
* @brief Send a resume condition on a port's bus
*
* This function will send a resume condition, and then un-pause all the pipes routed through a port
*
* Entry:
* - The port must be in the HCD_PORT_STATE_SUSPENDED state
* Exit:
* - The port is put into the enabled state and all pipes un-paused
*
* @note This function is blocking (will exit and re-enter the critical section to do so)
*
* @param port Port object
* @return true Resume condition successfully sent. Port is now in the HCD_PORT_STATE_ENABLED state
* @return false Failed to send a resume condition due to unexpected port state.
*/
static bool _port_bus_resume(port_t *port);
/**
* @brief Disable a port
*
* Entry:
* - The port must be in the HCD_PORT_STATE_ENABLED or HCD_PORT_STATE_SUSPENDED state
* Exit:
* - All pipes paused (should already be paused if port was suspended), and the port is put into the disabled state.
*
* @note This function is blocking (will exit and re-enter the critical section to do so)
*
* @param port Port object
* @return true Port successfully disabled
* @return false Port to disable port due to unexpected port state
*/
static bool _port_disable(port_t *port);
/**
* @brief Debounce port after a connection or disconnection event
*
* This function should be called after a port connection or disconnect event. This function will execute a debounce
* delay then check the actual connection/disconnections state.
*
* @param port Port object
* @return true A device is connected
* @return false No device connected
*/
static bool _port_debounce(port_t *port);
// ------------------------ Pipe ---------------------------
/**
* @brief Get the next pending transfer request from the pending tailq
*
* Entry:
* - The inflight transfer request must be set to NULL (indicating the pipe currently has no inflight transfer request)
* Exit:
* - If (num_xfer_req_pending > 0), the first transfer request is removed from pend_xfer_req_tailq and and
* inflight_xfer_req is set to that transfer request.
* - If there are no more queued transfer requests, inflight_xfer_req is left as NULL
*
* @param pipe Pipe object
* @return true A pending transfer request is now set as the inflight transfer request
* @return false No more pending transfer requests
*/
static bool _pipe_get_next_xfer_req(pipe_t *pipe);
/**
* @brief Return the inflight transfer request to the done tailq
*
* Entry:
* - The inflight transfer request must already have been parsed (i.e., results have been checked)
* Exit:
* - The inflight transfer request is returned to the done tailq and inflight_xfer_req is set to NULL
*
* @param pipe Pipe object
*/
static void _pipe_ret_cur_xfer_req(pipe_t *pipe);
/**
* @brief Wait until a pipe's inflight transfer request is done
*
* If the pipe has an inflight transfer request, this function will block until it is done (via a internal pipe event).
* If the pipe has no inflight transfer request, this function do nothing and return immediately.
* If the pipe's state changes unexpectedely, this function will return false.
*
* @note This function is blocking (will exit and re-enter the critical section to do so)
*
* @param pipe Pipe object
* @return true Pipes inflight transfer request is done
* @return false Pipes state unexpectedly changed
*/
static bool _pipe_wait_done(pipe_t *pipe);
/**
* @brief Retires all transfer requests (those that were previously inflight or pending)
*
* Retiring all transfer requests will result in any pending transfer request being moved to the done tailq. This
* function will update the IPR status of each transfer request.
* - If the retiring is self-initiated (i.e., due to a pipe command), the IRP status will be set to USB_TRANSFER_STATUS_CANCELLED.
* - If the retiring is NOT self-initiated (i.e., the pipe is no longer valid), the IRP status will be set to USB_TRANSFER_STATUS_NO_DEVICE
*
* Entry:
* - There can be no inflight transfer request (must already be parsed and returned to done queue)
* Exit:
* - If there was an inflight transfer request, it is parsed and returned to the done queue
* - If there are any pending transfer requests:
* - They are moved to the done tailq
*
* @param pipe Pipe object
* @param cancelled Are we actively Pipe retire is initialized by the user due to a command, thus transfer request are actively
* cancelled
*/
static void _pipe_retire(pipe_t *pipe, bool self_initiated);
/**
* @brief Decode a HAL channel error to the corresponding pipe event
*
* @param chan_error The HAL channel error
* @return hcd_pipe_event_t The corresponding pipe error event
*/
static inline hcd_pipe_event_t pipe_decode_error_event(usbh_hal_chan_error_t chan_error);
// ------------------ Transfer Requests --------------------
/**
* @brief Fill a transfer request into the pipe's transfer descriptor list
*
* Entry:
* - The pipe's inflight_xfer_req must be set to the next transfer request
* Exit:
* - inflight_xfer_req filled into the pipe's transfer descriptor list
* - Starting PIDs and directions set
* - Channel slot acquired. Will need to call usbh_hal_chan_activate() to actually start execution
*
* @param pipe Pipe where inflight_xfer_req is already set to the next transfer request
*/
static void _xfer_req_fill(pipe_t *pipe);
/**
* @brief Continue a transfer request
*
* @note This is currently only used for control transfers
*
* @param pipe Pipe where inflight_xfer_req contains the transfer request to continue
*/
static void _xfer_req_continue(pipe_t *pipe);
/**
* @brief Parse the results of a pipe's transfer descriptor list into a transfer request
*
* Entry:
* - The pipe must have stop transferring either due a channel event or a port disconnection.
* - The pipe's state and last_event must be updated before parsing the transfer request as
* they will used to determine the resuult of the transfer request
* Exit:
* - The pipe's inflight_xfer_req is filled with result of the transfer request (i.e., the underlying IRP has its status set)
*
* @param pipe Pipe where inflight_xfer_req contains the completed transfer request
* @param error_occurred Are we parsing after the pipe had an error (or has become invalid)
*/
static void _xfer_req_parse(pipe_t *pipe, bool error_occurred);
// ----------------------------------------------- Interrupt Handling --------------------------------------------------
// ------------------- Internal Event ----------------------
static void _internal_port_event_wait(port_t *port)
{
//There must NOT be another thread/task already waiting for an internal event
assert(port->task_waiting_port_notif == NULL);
port->task_waiting_port_notif = xTaskGetCurrentTaskHandle();
HCD_EXIT_CRITICAL();
//Wait to be notified from ISR
ulTaskNotifyTake(pdTRUE, portMAX_DELAY);
HCD_ENTER_CRITICAL();
port->task_waiting_port_notif = NULL;
}
static bool _internal_port_event_notify_from_isr(port_t *port)
{
//There must be a thread/task waiting for an internal event
assert(port->task_waiting_port_notif != NULL);
BaseType_t xTaskWoken = pdFALSE;
//Unblock the thread/task waiting for the notification
HCD_EXIT_CRITICAL_ISR();
vTaskNotifyGiveFromISR(port->task_waiting_port_notif, &xTaskWoken);
HCD_ENTER_CRITICAL_ISR();
return (xTaskWoken == pdTRUE);
}
static void _internal_pipe_event_wait(pipe_t *pipe)
{
//There must NOT be another thread/task already waiting for an internal event
assert(pipe->task_waiting_pipe_notif == NULL);
pipe->task_waiting_pipe_notif = xTaskGetCurrentTaskHandle();
HCD_EXIT_CRITICAL();
//Wait to be notified from ISR
ulTaskNotifyTake(pdTRUE, portMAX_DELAY);
HCD_ENTER_CRITICAL();
pipe->task_waiting_pipe_notif = NULL;
}
static bool _internal_pipe_event_notify(pipe_t *pipe, bool from_isr)
{
//There must be a thread/task waiting for an internal event
assert(pipe->task_waiting_pipe_notif != NULL);
bool ret;
if (from_isr) {
BaseType_t xTaskWoken = pdFALSE;
HCD_EXIT_CRITICAL_ISR();
//Unblock the thread/task waiting for the pipe notification
vTaskNotifyGiveFromISR(pipe->task_waiting_pipe_notif, &xTaskWoken);
HCD_ENTER_CRITICAL_ISR();
ret = (xTaskWoken == pdTRUE);
} else {
HCD_EXIT_CRITICAL();
xTaskNotifyGive(pipe->task_waiting_pipe_notif);
HCD_ENTER_CRITICAL();
ret = false;
}
return ret;
}
// ----------------- Interrupt Handlers --------------------
/**
* @brief Handle a HAL port interrupt and obtain the corresponding port event
*
* @param[in] port Port object
* @param[in] hal_port_event The HAL port event
* @param[out] yield Set to true if a yield is required as a result of handling the interrupt
* @return hcd_port_event_t Returns a port event, or HCD_PORT_EVENT_NONE if no port event occurred
*/
static hcd_port_event_t _intr_hdlr_hprt(port_t *port, usbh_hal_port_event_t hal_port_event, bool *yield)
{
hcd_port_event_t port_event = HCD_PORT_EVENT_NONE;
switch (hal_port_event) {
case USBH_HAL_PORT_EVENT_CONN: {
//Don't update state immediately, we still need to debounce.
port_event = HCD_PORT_EVENT_CONNECTION;
break;
}
case USBH_HAL_PORT_EVENT_DISCONN: {
if (port->flags.conn_devc_ena) {
//The port was previously enabled, so this is a sudden disconenction
port->state = HCD_PORT_STATE_RECOVERY;
port_event = HCD_PORT_EVENT_SUDDEN_DISCONN;
} else {
//For normal disconnections, don't update state immediately as we still need to debounce.
port_event = HCD_PORT_EVENT_DISCONNECTION;
}
port->flags.conn_devc_ena = 0;
break;
}
case USBH_HAL_PORT_EVENT_ENABLED: {
usbh_hal_port_enable(port->hal); //Initialize remaining host port registers
port->speed = usbh_hal_port_get_conn_speed(port->hal);
port->state = HCD_PORT_STATE_ENABLED;
port->flags.conn_devc_ena = 1;
//This was triggered by a command, so no event needs to be propagated.
break;
}
case USBH_HAL_PORT_EVENT_DISABLED: {
port->flags.conn_devc_ena = 0;
//Disabled could be due to a disable request or reset request, or due to a port error
if (port->state != HCD_PORT_STATE_RESETTING) { //Ignore the disable event if it's due to a reset request
port->state = HCD_PORT_STATE_DISABLED;
if (port->flags.disable_requested) {
//Disabled by request (i.e. by port command). Generate an internal event
port->flags.disable_requested = 0;
*yield |= _internal_port_event_notify_from_isr(port);
} else {
//Disabled due to a port error
port_event = HCD_PORT_EVENT_ERROR;
}
}
break;
}
case USBH_HAL_PORT_EVENT_OVRCUR:
case USBH_HAL_PORT_EVENT_OVRCUR_CLR: { //Could occur if a quick overcurrent then clear happens
if (port->state != HCD_PORT_STATE_NOT_POWERED) {
//We need to power OFF the port to protect it
usbh_hal_port_toggle_power(port->hal, false);
port->state = HCD_PORT_STATE_NOT_POWERED;
port_event = HCD_PORT_EVENT_OVERCURRENT;
}
port->flags.conn_devc_ena = 0;
break;
}
default: {
abort();
break;
}
}
return port_event;
}
/**
* @brief Handles a HAL channel interrupt
*
* This function should be called on a HAL channel when it has an interrupt. Most HAL channel events will correspond to
* to a pipe event, but not always. This function will store the pipe event and return a pipe object pointer if a pipe
* event occurred, or return NULL otherwise.
*
* @param[in] chan_obj Pointer to HAL channel object with interrupt
* @param[out] yield Set to true if a yield is required as a result of handling the interrupt
* @return hcd_pipe_event_t The pipe event
*/
static hcd_pipe_event_t _intr_hdlr_chan(pipe_t *pipe, usbh_hal_chan_t *chan_obj, bool *yield)
{
usbh_hal_chan_event_t chan_event = usbh_hal_chan_decode_intr(chan_obj);
hcd_pipe_event_t event = HCD_PIPE_EVENT_NONE;
//Check the the pipe's port still has a connected and enabled device before processing the interrupt
if (!pipe->port->flags.conn_devc_ena) {
return event; //Treat as a no event.
}
switch (chan_event) {
case USBH_HAL_CHAN_EVENT_SLOT_DONE: {
//An entire transfer descriptor list has completed execution
pipe->last_event = HCD_PIPE_EVENT_XFER_REQ_DONE;
event = HCD_PIPE_EVENT_XFER_REQ_DONE;
_xfer_req_parse(pipe, false); //Parse results of transfer request
_pipe_ret_cur_xfer_req(pipe); //Return the transfer request to the pipe's done tailq
if (pipe->flags.waiting_xfer_done) {
//A port/pipe command is waiting for this pipe to complete its transfer. So don't load the next transfer
pipe->flags.waiting_xfer_done = 0;
if (pipe->port->flags.waiting_all_pipes_pause) {
//Port command is waiting for all pipes to be paused
pipe->flags.paused = 1;
pipe->port->flags.num_pipes_waiting_pause--;
if (pipe->port->flags.num_pipes_waiting_pause == 0) {
//All pipes have finished pausing, Notify the blocked port command
pipe->port->flags.waiting_all_pipes_pause = 0;
*yield |= _internal_port_event_notify_from_isr(pipe->port);
}
} else {
//Pipe command is waiting for transfer to complete
*yield |= _internal_pipe_event_notify(pipe, true);
}
} else if (_pipe_get_next_xfer_req(pipe)) {
//Fill the descriptor list with the transfer request and start the transfer
_xfer_req_fill(pipe);
usbh_hal_chan_activate(chan_obj, 0); //Start with the first descriptor
}
break;
}
case USBH_HAL_CHAN_EVENT_SLOT_HALT: {
//A transfer descriptor list has partially completed. This currently only happens on control pipes
assert(pipe->ep_char.type == USB_XFER_TYPE_CTRL);
_xfer_req_continue(pipe); //Continue the transfer request.
//We are continuing a transfer, so no event has occurred
break;
}
case USBH_HAL_CHAN_EVENT_ERROR: {
//Get and store the pipe error event
usbh_hal_chan_error_t chan_error = usbh_hal_chan_get_error(chan_obj);
usbh_hal_chan_clear_error(chan_obj);
pipe->last_event = pipe_decode_error_event(chan_error);
event = pipe->last_event;
pipe->state = HCD_PIPE_STATE_HALTED;
//Parse the failed transfer request and update it's IRP status
_xfer_req_parse(pipe, true);
_pipe_ret_cur_xfer_req(pipe); //Return the transfer request to the pipe's done tailq
break;
}
case USBH_HAL_CHAN_EVENT_HALT_REQ: //We currently don't halt request so this event should never occur
default:
abort();
break;
}
return event;
}
/**
* @brief Main interrupt handler
*
* - Handle all HPRT (Host Port) related interrupts first as they may change the
* state of the driver (e.g., a disconnect event)
* - If any channels (pipes) have pending interrupts, handle them one by one
* - The HCD has not blocking functions, so the user's ISR callback is run to
* allow the users to send whatever OS primitives they need.
* @param arg
*/
static void intr_hdlr_main(void *arg)
{
port_t *port = (port_t *)arg;
bool yield = false;
HCD_ENTER_CRITICAL_ISR();
usbh_hal_port_event_t hal_port_evt = usbh_hal_decode_intr(port->hal);
if (hal_port_evt == USBH_HAL_PORT_EVENT_CHAN) {
//Channel event. Cycle through each pending channel
usbh_hal_chan_t *chan_obj = usbh_hal_get_chan_pending_intr(port->hal);
while (chan_obj != NULL) {
pipe_t *pipe = (pipe_t *)usbh_hal_chan_get_context(chan_obj);
hcd_pipe_event_t event = _intr_hdlr_chan(pipe, chan_obj, &yield);
//Run callback if a pipe event has occurred and the pipe also has a callback
if (event != HCD_PIPE_EVENT_NONE && pipe->callback != NULL) {
HCD_EXIT_CRITICAL_ISR();
yield |= pipe->callback((hcd_pipe_handle_t)pipe, event, pipe->callback_arg, true);
HCD_ENTER_CRITICAL_ISR();
}
//Check for more channels with pending interrupts. Returns NULL if there are no more
chan_obj = usbh_hal_get_chan_pending_intr(port->hal);
}
} else if (hal_port_evt != USBH_HAL_PORT_EVENT_NONE) { //Port event
hcd_port_event_t port_event = _intr_hdlr_hprt(port, hal_port_evt, &yield);
if (port_event != HCD_PORT_EVENT_NONE) {
port->last_event = port_event;
port->flags.event_pending = 1;
if (port->callback != NULL) {
HCD_EXIT_CRITICAL_ISR();
yield |= port->callback((hcd_port_handle_t)port, port_event, port->callback_arg, true);
HCD_ENTER_CRITICAL_ISR();
}
}
}
HCD_EXIT_CRITICAL_ISR();
if (yield) {
portYIELD_FROM_ISR();
}
}
// --------------------------------------------- Host Controller Driver ------------------------------------------------
static port_t *port_obj_alloc(void)
{
port_t *port = calloc(1, sizeof(port_t));
usbh_hal_context_t *hal = malloc(sizeof(usbh_hal_context_t));
SemaphoreHandle_t port_mux = xSemaphoreCreateMutex();
if (port == NULL || hal == NULL || port_mux == NULL) {
free(port);
free(hal);
if (port_mux != NULL) {
vSemaphoreDelete(port_mux);
}
return NULL;
}
port->hal = hal;
port->port_mux = port_mux;
return port;
}
static void port_obj_free(port_t *port)
{
if (port == NULL) {
return;
}
vSemaphoreDelete(port->port_mux);
free(port->hal);
free(port);
}
// ----------------------- Public --------------------------
esp_err_t hcd_install(const hcd_config_t *config)
{
HCD_ENTER_CRITICAL();
HCD_CHECK_FROM_CRIT(s_hcd_obj == NULL, ESP_ERR_INVALID_STATE);
HCD_EXIT_CRITICAL();
esp_err_t err_ret;
//Allocate memory and resources for driver object and all port objects
hcd_obj_t *p_hcd_obj_dmy = calloc(1, sizeof(hcd_obj_t));
if (p_hcd_obj_dmy == NULL) {
return ESP_ERR_NO_MEM;
}
//Allocate resources for each port (there's only one)
p_hcd_obj_dmy->port_obj = port_obj_alloc();
esp_err_t intr_alloc_ret = esp_intr_alloc(ETS_USB_INTR_SOURCE,
config->intr_flags | ESP_INTR_FLAG_INTRDISABLED, //The interruupt must be disabled until the port is initialized
intr_hdlr_main,
(void *)p_hcd_obj_dmy->port_obj,
&p_hcd_obj_dmy->isr_hdl);
if (p_hcd_obj_dmy->port_obj == NULL) {
err_ret = ESP_ERR_NO_MEM;
}
if (intr_alloc_ret != ESP_OK) {
err_ret = intr_alloc_ret;
goto err;
}
HCD_ENTER_CRITICAL();
if (s_hcd_obj != NULL) {
HCD_EXIT_CRITICAL();
err_ret = ESP_ERR_INVALID_STATE;
goto err;
}
s_hcd_obj = p_hcd_obj_dmy;
//Set HW prereqs for each port (there's only one)
periph_module_enable(PERIPH_USB_MODULE);
periph_module_reset(PERIPH_USB_MODULE);
/*
Configure GPIOS for Host mode operation using internal PHY
- Forces ID to GND for A side
- Forces B Valid to GND as we are A side host
- Forces VBUS Valid to HIGH
- Froces A Valid to HIGH
*/
esp_rom_gpio_connect_in_signal(GPIO_MATRIX_CONST_ZERO_INPUT, USB_OTG_IDDIG_IN_IDX, false);
esp_rom_gpio_connect_in_signal(GPIO_MATRIX_CONST_ZERO_INPUT, USB_SRP_BVALID_IN_IDX, false);
esp_rom_gpio_connect_in_signal(GPIO_MATRIX_CONST_ONE_INPUT, USB_OTG_VBUSVALID_IN_IDX, false);
esp_rom_gpio_connect_in_signal(GPIO_MATRIX_CONST_ONE_INPUT, USB_OTG_AVALID_IN_IDX, false);
HCD_EXIT_CRITICAL();
return ESP_OK;
err:
if (intr_alloc_ret == ESP_OK) {
esp_intr_free(p_hcd_obj_dmy->isr_hdl);
}
port_obj_free(p_hcd_obj_dmy->port_obj);
free(p_hcd_obj_dmy);
return err_ret;
}
esp_err_t hcd_uninstall(void)
{
HCD_ENTER_CRITICAL();
//Check that all ports have been disabled (theres only one)
if (s_hcd_obj == NULL || s_hcd_obj->port_obj->initialized) {
HCD_EXIT_CRITICAL();
return ESP_ERR_INVALID_STATE;
}
periph_module_disable(PERIPH_USB_MODULE);
hcd_obj_t *p_hcd_obj_dmy = s_hcd_obj;
s_hcd_obj = NULL;
HCD_EXIT_CRITICAL();
//Free resources
port_obj_free(p_hcd_obj_dmy->port_obj);
esp_intr_free(p_hcd_obj_dmy->isr_hdl);
free(p_hcd_obj_dmy);
return ESP_OK;
}
// ------------------------------------------------------ Port ---------------------------------------------------------
// ----------------------- Private -------------------------
static void _port_invalidate_all_pipes(port_t *port)
{
//This function should only be called when the port is invalid
assert(!port->flags.conn_devc_ena);
pipe_t *pipe;
//Process all pipes that have queued transfer requests
TAILQ_FOREACH(pipe, &port->pipes_queued_tailq, tailq_entry) {
//Mark the pipe as invalid and set an invalid event
pipe->state = HCD_PIPE_STATE_INVALID;
pipe->last_event = HCD_PIPE_EVENT_INVALID;
//If the pipe had an inflight transfer, parse and return it
if (pipe->inflight_xfer_req != NULL) {
_xfer_req_parse(pipe, true);
_pipe_ret_cur_xfer_req(pipe);
}
//Retire any remaining transfer requests
_pipe_retire(pipe, false);
if (pipe->task_waiting_pipe_notif != NULL) {
//Unblock the thread/task waiting for a notification from the pipe as the pipe is no longer valid.
_internal_pipe_event_notify(pipe, false);
}
if (pipe->callback != NULL) {
HCD_EXIT_CRITICAL();
(void) pipe->callback((hcd_pipe_handle_t)pipe, HCD_PIPE_EVENT_INVALID, pipe->callback_arg, false);
HCD_ENTER_CRITICAL();
}
}
//Process all idle pipes
TAILQ_FOREACH(pipe, &port->pipes_idle_tailq, tailq_entry) {
//Mark pipe as invalid and call its callback
pipe->state = HCD_PIPE_STATE_INVALID;
pipe->last_event = HCD_PIPE_EVENT_INVALID;
if (pipe->callback != NULL) {
HCD_EXIT_CRITICAL();
(void) pipe->callback((hcd_pipe_handle_t)pipe, HCD_PIPE_EVENT_INVALID, pipe->callback_arg, false);
HCD_ENTER_CRITICAL();
}
}
}
static bool _port_pause_all_pipes(port_t *port)
{
assert(port->state == HCD_PORT_STATE_ENABLED);
pipe_t *pipe;
int num_pipes_waiting_done = 0;
//Process all pipes that have queued transfer requests
TAILQ_FOREACH(pipe, &port->pipes_queued_tailq, tailq_entry) {
if (pipe->inflight_xfer_req != NULL) {
//Pipe has an inflight transfer. Indicate to the pipe we are waiting the transfer to complete
pipe->flags.waiting_xfer_done = 1;
num_pipes_waiting_done++;
} else {
//No inflight transfer so no need to wait
pipe->flags.paused = 1;
}
}
//Process all idle pipes. They don't have queue transfer so just mark them as paused
TAILQ_FOREACH(pipe, &port->pipes_idle_tailq, tailq_entry) {
pipe->flags.paused = 1;
}
if (num_pipes_waiting_done > 0) {
//Indicate we need to wait for one or more pipes to complete their transfers
port->flags.num_pipes_waiting_pause = num_pipes_waiting_done;
port->flags.waiting_all_pipes_pause = 1;
return false;
}
return true;
}
static void _port_unpause_all_pipes(port_t *port)
{
assert(port->state == HCD_PORT_STATE_ENABLED);
pipe_t *pipe;
//Process all idle pipes. They don't have queue transfer so just mark them as un-paused
TAILQ_FOREACH(pipe, &port->pipes_idle_tailq, tailq_entry) {
pipe->flags.paused = 0;
}
//Process all pipes that have queued transfer requests
TAILQ_FOREACH(pipe, &port->pipes_queued_tailq, tailq_entry) {
pipe->flags.paused = 0;
//If the pipe has more pending transfer request, start them.
if (_pipe_get_next_xfer_req(pipe)) {
_xfer_req_fill(pipe);
usbh_hal_chan_activate(pipe->chan_obj, 0);
}
}
}
static bool _port_bus_reset(port_t *port)
{
assert(port->state == HCD_PORT_STATE_ENABLED || port->state == HCD_PORT_STATE_DISABLED);
//Put and hold the bus in the reset state. If the port was previously enabled, a disabled event will occur after this
port->state = HCD_PORT_STATE_RESETTING;
usbh_hal_port_toggle_reset(port->hal, true);
HCD_EXIT_CRITICAL();
vTaskDelay(pdMS_TO_TICKS(RESET_HOLD_MS));
HCD_ENTER_CRITICAL();
if (port->state != HCD_PORT_STATE_RESETTING) {
//The port state has unexpectedly changed
goto bailout;
}
//Return the bus to the idle state and hold it for the required reset recovery time. Port enabled event should occur
usbh_hal_port_toggle_reset(port->hal, false);
HCD_EXIT_CRITICAL();
vTaskDelay(pdMS_TO_TICKS(RESET_RECOVERY_MS));
HCD_ENTER_CRITICAL();
if (port->state != HCD_PORT_STATE_ENABLED || !port->flags.conn_devc_ena) {
//The port state has unexpectedly changed
goto bailout;
}
return true;
bailout:
return false;
}
static bool _port_bus_suspend(port_t *port)
{
assert(port->state == HCD_PORT_STATE_ENABLED);
//Pause all pipes before suspending the bus
if (!_port_pause_all_pipes(port)) {
//Need to wait for some pipes to pause. Wait for notification from ISR
_internal_port_event_wait(port);
if (port->state != HCD_PORT_STATE_ENABLED || !port->flags.conn_devc_ena) {
//Port state unexpectedley changed
goto bailout;
}
}
//All pipes are guaranteed paused at this point. Proceed to suspend the port
usbh_hal_port_suspend(port->hal);
port->state = HCD_PORT_STATE_SUSPENDED;
return true;
bailout:
return false;
}
static bool _port_bus_resume(port_t *port)
{
assert(port->state == HCD_PORT_STATE_SUSPENDED);
//Put and hold the bus in the K state.
usbh_hal_port_toggle_resume(port->hal, true);
port->state = HCD_PORT_STATE_RESUMING;
HCD_EXIT_CRITICAL();
vTaskDelay(pdMS_TO_TICKS(RESUME_HOLD_MS));
HCD_ENTER_CRITICAL();
//Return and hold the bus to the J state (as port of the LS EOP)
usbh_hal_port_toggle_resume(port->hal, false);
if (port->state != HCD_PORT_STATE_RESUMING || !port->flags.conn_devc_ena) {
//Port state unexpectedley changed
goto bailout;
}
HCD_EXIT_CRITICAL();
vTaskDelay(pdMS_TO_TICKS(RESUME_RECOVERY_MS));
HCD_ENTER_CRITICAL();
if (port->state != HCD_PORT_STATE_RESUMING || !port->flags.conn_devc_ena) {
//Port state unexpectedley changed
goto bailout;
}
port->state = HCD_PORT_STATE_ENABLED;
_port_unpause_all_pipes(port);
return true;
bailout:
return false;
}
static bool _port_disable(port_t *port)
{
assert(port->state == HCD_PORT_STATE_ENABLED || port->state == HCD_PORT_STATE_SUSPENDED);
if (port->state == HCD_PORT_STATE_ENABLED) {
//There may be pipes that are still transferring, so pause them.
if (!_port_pause_all_pipes(port)) {
//Need to wait for some pipes to pause. Wait for notification from ISR
_internal_port_event_wait(port);
if (port->state != HCD_PORT_STATE_ENABLED || !port->flags.conn_devc_ena) {
//Port state unexpectedley changed
goto bailout;
}
}
}
//All pipes are guaranteed paused at this point. Proceed to suspend the port. This should trigger an internal event
port->flags.disable_requested = 1;
usbh_hal_port_disable(port->hal);
_internal_port_event_wait(port);
if (port->state != HCD_PORT_STATE_DISABLED) {
//Port state unexpectedley changed
goto bailout;
}
_port_invalidate_all_pipes(port);
return true;
bailout:
return false;
}
static bool _port_debounce(port_t *port)
{
if (port->state == HCD_PORT_STATE_NOT_POWERED) {
//Disconnect event due to power off, no need to debounce or update port state.
return false;
}
HCD_EXIT_CRITICAL();
vTaskDelay(pdMS_TO_TICKS(DEBOUNCE_DELAY_MS));
HCD_ENTER_CRITICAL();
//Check the post-debounce state of the bus (i.e., whether it's actually connected/disconnected)
bool is_connected = usbh_hal_port_check_if_connected(port->hal);
if (is_connected) {
port->state = HCD_PORT_STATE_DISABLED;
} else {
port->state = HCD_PORT_STATE_DISCONNECTED;
}
//Disable debounce lock
usbh_hal_disable_debounce_lock(port->hal);
return is_connected;
}
// ----------------------- Public --------------------------
esp_err_t hcd_port_init(int port_number, hcd_port_config_t *port_config, hcd_port_handle_t *port_hdl)
{
HCD_CHECK(port_number > 0 && port_config != NULL && port_hdl != NULL, ESP_ERR_INVALID_ARG);
HCD_CHECK(port_number <= NUM_PORTS, ESP_ERR_NOT_FOUND);
HCD_ENTER_CRITICAL();
HCD_CHECK_FROM_CRIT(s_hcd_obj != NULL && !s_hcd_obj->port_obj->initialized, ESP_ERR_INVALID_STATE);
//Port object memory and resources (such as mutex) already be allocated. Just need to initialize necessary fields only
port_t *port_obj = s_hcd_obj->port_obj;
TAILQ_INIT(&port_obj->pipes_idle_tailq);
TAILQ_INIT(&port_obj->pipes_queued_tailq);
port_obj->state = HCD_PORT_STATE_NOT_POWERED;
port_obj->last_event = HCD_PORT_EVENT_NONE;
port_obj->callback = port_config->callback;
port_obj->callback_arg = port_config->callback_arg;
port_obj->context = port_config->context;
usbh_hal_init(port_obj->hal);
port_obj->initialized = true;
esp_intr_enable(s_hcd_obj->isr_hdl);
*port_hdl = (hcd_port_handle_t)port_obj;
HCD_EXIT_CRITICAL();
vTaskDelay(pdMS_TO_TICKS(INIT_DELAY_MS)); //Need a short delay before host mode takes effect
return ESP_OK;
}
esp_err_t hcd_port_deinit(hcd_port_handle_t port_hdl)
{
port_t *port = (port_t *)port_hdl;
HCD_ENTER_CRITICAL();
HCD_CHECK_FROM_CRIT(s_hcd_obj != NULL && port->initialized
&& port->num_pipes_idle == 0 && port->num_pipes_queued == 0
&& (port->state == HCD_PORT_STATE_NOT_POWERED || port->state == HCD_PORT_STATE_RECOVERY)
&& port->flags.val == 0 && port->task_waiting_port_notif == NULL,
ESP_ERR_INVALID_STATE);
port->initialized = false;
esp_intr_disable(s_hcd_obj->isr_hdl);
usbh_hal_deinit(port->hal);
HCD_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t hcd_port_command(hcd_port_handle_t port_hdl, hcd_port_cmd_t command)
{
esp_err_t ret = ESP_ERR_INVALID_STATE;
port_t *port = (port_t *)port_hdl;
xSemaphoreTake(port->port_mux, portMAX_DELAY);
HCD_ENTER_CRITICAL();
if (port->initialized && !port->flags.event_pending) { //Port events need to be handled first before issuing a command
port->flags.cmd_processing = 1;
switch (command) {
case HCD_PORT_CMD_POWER_ON: {
//Port can only be powered on if currently unpowered
if (port->state == HCD_PORT_STATE_NOT_POWERED) {
port->state = HCD_PORT_STATE_DISCONNECTED;
usbh_hal_port_start(port->hal);
usbh_hal_port_toggle_power(port->hal, true);
ret = ESP_OK;
}
break;
}
case HCD_PORT_CMD_POWER_OFF: {
//Port can only be unpowered if already powered
if (port->state != HCD_PORT_STATE_NOT_POWERED) {
port->state = HCD_PORT_STATE_NOT_POWERED;
usbh_hal_port_stop(port->hal);
usbh_hal_port_toggle_power(port->hal, false);
//If a device is currently connected, this should trigger a disconnect event
ret = ESP_OK;
}
break;
}
case HCD_PORT_CMD_RESET: {
//Port can only a reset when it is in the enabled or disabled states (in case of new connection)
if (port->state == HCD_PORT_STATE_ENABLED || port->state == HCD_PORT_STATE_DISABLED) {
ret = (_port_bus_reset(port)) ? ESP_OK : ESP_ERR_INVALID_RESPONSE;
}
break;
}
case HCD_PORT_CMD_SUSPEND: {
//Port can only be suspended if already in the enabled state
if (port->state == HCD_PORT_STATE_ENABLED) {
ret = (_port_bus_suspend(port)) ? ESP_OK : ESP_ERR_INVALID_RESPONSE;
}
break;
}
case HCD_PORT_CMD_RESUME: {
//Port can only be resumed if already suspended
if (port->state == HCD_PORT_STATE_SUSPENDED) {
ret = (_port_bus_resume(port)) ? ESP_OK : ESP_ERR_INVALID_RESPONSE;
}
break;
}
case HCD_PORT_CMD_DISABLE: {
//Can only disable the port when already enabled or suspended
if (port->state == HCD_PORT_STATE_ENABLED || port->state == HCD_PORT_STATE_SUSPENDED) {
ret = (_port_disable(port)) ? ESP_OK : ESP_ERR_INVALID_RESPONSE;
}
break;
}
}
port->flags.cmd_processing = 0;
}
HCD_EXIT_CRITICAL();
xSemaphoreGive(port->port_mux);
return ret;
}
hcd_port_state_t hcd_port_get_state(hcd_port_handle_t port_hdl)
{
port_t *port = (port_t *)port_hdl;
hcd_port_state_t ret;
HCD_ENTER_CRITICAL();
ret = port->state;
HCD_EXIT_CRITICAL();
return ret;
}
esp_err_t hcd_port_get_speed(hcd_port_handle_t port_hdl, usb_speed_t *speed)
{
port_t *port = (port_t *)port_hdl;
HCD_CHECK(speed != NULL, ESP_ERR_INVALID_ARG);
HCD_ENTER_CRITICAL();
//Device speed is only valid if there is a resetted device connected to the port
HCD_CHECK_FROM_CRIT(port->flags.conn_devc_ena, ESP_ERR_INVALID_STATE);
*speed = usbh_hal_port_get_conn_speed(port->hal);
HCD_EXIT_CRITICAL();
return ESP_OK;
}
hcd_port_event_t hcd_port_handle_event(hcd_port_handle_t port_hdl)
{
port_t *port = (port_t *)port_hdl;
hcd_port_event_t ret = HCD_PORT_EVENT_NONE;
xSemaphoreTake(port->port_mux, portMAX_DELAY);
HCD_ENTER_CRITICAL();
if (port->initialized && port->flags.event_pending) {
port->flags.event_pending = 0;
port->flags.event_processing = 1;
ret = port->last_event;
switch (ret) {
case HCD_PORT_EVENT_CONNECTION: {
if (_port_debounce(port)) {
ret = HCD_PORT_EVENT_CONNECTION;
}
break;
}
case HCD_PORT_EVENT_DISCONNECTION:
if (_port_debounce(port)) {
//A device is still connected, so it was just a debounce
port->state = HCD_PORT_STATE_DISABLED;
ret = HCD_PORT_EVENT_NONE;
} else {
//No device conencted after debounce delay. This is an actual disconenction
port->state = HCD_PORT_STATE_DISCONNECTED;
ret = HCD_PORT_EVENT_DISCONNECTION;
}
break;
case HCD_PORT_EVENT_ERROR:
case HCD_PORT_EVENT_OVERCURRENT:
case HCD_PORT_EVENT_SUDDEN_DISCONN: {
_port_invalidate_all_pipes(port);
break;
}
default: {
break;
}
}
port->flags.event_processing = 0;
} else {
ret = HCD_PORT_EVENT_NONE;
}
HCD_EXIT_CRITICAL();
xSemaphoreGive(port->port_mux);
return ret;
}
esp_err_t hcd_port_recover(hcd_port_handle_t port_hdl)
{
port_t *port = (port_t *)port_hdl;
HCD_ENTER_CRITICAL();
HCD_CHECK_FROM_CRIT(s_hcd_obj != NULL && port->initialized && port->state == HCD_PORT_STATE_RECOVERY
&& port->num_pipes_idle == 0 && port->num_pipes_queued == 0
&& port->flags.val == 0 && port->task_waiting_port_notif == NULL,
ESP_ERR_INVALID_STATE);
//We are about to do a soft reset on the peripheral. Disable the peripheral throughout
esp_intr_disable(s_hcd_obj->isr_hdl);
usbh_hal_core_soft_reset(port->hal);
port->state = HCD_PORT_STATE_NOT_POWERED;
port->last_event = HCD_PORT_EVENT_NONE;
port->flags.val = 0;
esp_intr_enable(s_hcd_obj->isr_hdl);
HCD_EXIT_CRITICAL();
return ESP_OK;
}
void *hcd_port_get_ctx(hcd_port_handle_t port_hdl)
{
port_t *port = (port_t *)port_hdl;
void *ret;
HCD_ENTER_CRITICAL();
ret = port->context;
HCD_EXIT_CRITICAL();
return ret;
}
// --------------------------------------------------- HCD Pipes -------------------------------------------------------
// ----------------------- Private -------------------------
static bool _pipe_get_next_xfer_req(pipe_t *pipe)
{
assert(pipe->inflight_xfer_req == NULL);
bool ret;
//This function assigns the next pending transfer request to the inflight_xfer_req
if (pipe->num_xfer_req_pending > 0) {
//Set inflight_xfer_req to the next pending transfer request
pipe->inflight_xfer_req = TAILQ_FIRST(&pipe->pend_xfer_req_tailq);
TAILQ_REMOVE(&pipe->pend_xfer_req_tailq, pipe->inflight_xfer_req, tailq_entry);
pipe->inflight_xfer_req->state = XFER_REQ_STATE_INFLIGHT;
pipe->num_xfer_req_pending--;
ret = true;
} else {
ret = false;
}
return ret;
}
static void _pipe_ret_cur_xfer_req(pipe_t *pipe)
{
assert(pipe->inflight_xfer_req != NULL);
//Add the transfer request to the pipe's done tailq
TAILQ_INSERT_TAIL(&pipe->done_xfer_req_tailq, pipe->inflight_xfer_req, tailq_entry);
pipe->inflight_xfer_req->state = XFER_REQ_STATE_DONE;
pipe->inflight_xfer_req = NULL;
pipe->num_xfer_req_done++;
}
static bool _pipe_wait_done(pipe_t *pipe)
{
//Check if there is a currently inflight transfer request
if (pipe->inflight_xfer_req != NULL) {
//Wait for pipe to complete its transfer
pipe->flags.waiting_xfer_done = 1;
_internal_pipe_event_wait(pipe);
if (pipe->state == HCD_PIPE_STATE_INVALID) {
//The pipe become invalid whilst waiting for its internal event
pipe->flags.waiting_xfer_done = 0; //Need to manually reset this bit in this case
return false;
}
bool chan_halted = usbh_hal_chan_slot_request_halt(pipe->chan_obj);
assert(chan_halted);
(void) chan_halted;
}
return true;
}
static void _pipe_retire(pipe_t *pipe, bool self_initiated)
{
//Cannot have any inflight transfer request
assert(pipe->inflight_xfer_req == NULL);
if (pipe->num_xfer_req_pending > 0) {
//Process all remaining pending transfer requests
xfer_req_t *xfer_req;
TAILQ_FOREACH(xfer_req, &pipe->pend_xfer_req_tailq, tailq_entry) {
xfer_req->state = XFER_REQ_STATE_DONE;
//If we are initiating the retire, mark the transfer request as cancelled
xfer_req->irp->status = (self_initiated) ? USB_TRANSFER_STATUS_CANCELLED : USB_TRANSFER_STATUS_NO_DEVICE;
}
//Concatenated pending tailq to the done tailq
TAILQ_CONCAT(&pipe->done_xfer_req_tailq, &pipe->pend_xfer_req_tailq, tailq_entry);
pipe->num_xfer_req_done += pipe->num_xfer_req_pending;
pipe->num_xfer_req_pending = 0;
}
}
static inline hcd_pipe_event_t pipe_decode_error_event(usbh_hal_chan_error_t chan_error)
{
hcd_pipe_event_t event = HCD_PIPE_EVENT_NONE;
switch (chan_error) {
case USBH_HAL_CHAN_ERROR_XCS_XACT:
event = HCD_PIPE_EVENT_ERROR_XFER;
break;
case USBH_HAL_CHAN_ERROR_BNA:
event = HCD_PIPE_EVENT_ERROR_XFER_NOT_AVAIL;
break;
case USBH_HAL_CHAN_ERROR_PKT_BBL:
event = HCD_PIPE_EVENT_ERROR_OVERFLOW;
break;
case USBH_HAL_CHAN_ERROR_STALL:
event = HCD_PIPE_EVENT_ERROR_STALL;
break;
}
return event;
}
// ----------------------- Public --------------------------
esp_err_t hcd_pipe_alloc(hcd_port_handle_t port_hdl, const hcd_pipe_config_t *pipe_config, hcd_pipe_handle_t *pipe_hdl)
{
HCD_CHECK(port_hdl != NULL && pipe_config != NULL && pipe_hdl != NULL, ESP_ERR_INVALID_ARG);
port_t *port = (port_t *)port_hdl;
HCD_ENTER_CRITICAL();
//Can only allocate a pipe if the targetted port is initialized and conencted to an enabled device
HCD_CHECK_FROM_CRIT(port->initialized && port->flags.conn_devc_ena, ESP_ERR_INVALID_STATE);
usb_speed_t port_speed = port->speed;
HCD_EXIT_CRITICAL();
//Cannot connect to a FS device if the port is LS
HCD_CHECK(port_speed == USB_SPEED_FULL || (port_speed == USB_SPEED_LOW && pipe_config->dev_speed == USB_SPEED_LOW), ESP_ERR_NOT_SUPPORTED);
esp_err_t ret = ESP_OK;
//Get the type of pipe to allocate
usb_xfer_type_t type;
bool is_default_pipe;
if (pipe_config->ep_desc == NULL) { //A NULL ep_desc indicates we are allocating a default pipe
type = USB_XFER_TYPE_CTRL;
is_default_pipe = true;
} else {
type = USB_DESC_EP_GET_XFERTYPE(pipe_config->ep_desc);
is_default_pipe = false;
}
size_t num_xfer_desc = 0;
switch (type) {
case USB_XFER_TYPE_CTRL: {
num_xfer_desc = XFER_LIST_LEN_CTRL * NUM_DESC_PER_XFER_CTRL;
break;
}
case USB_XFER_TYPE_BULK: {
if (pipe_config->dev_speed == USB_SPEED_LOW) {
return ESP_ERR_NOT_SUPPORTED; //Low speed devices do not support bulk transfers
}
num_xfer_desc = XFER_LIST_LEN_BULK * NUM_DESC_PER_XFER_BULK;
break;
}
default: {
//Isochronous and Interrupt pipes currently not supported
return ESP_ERR_NOT_SUPPORTED;
}
}
//Allocate the pipe resources
pipe_t *pipe = calloc(1, sizeof(pipe_t));
usbh_hal_chan_t *chan_obj = malloc(sizeof(usbh_hal_chan_t));
void *xfer_desc_list = heap_caps_aligned_calloc(USBH_HAL_DMA_MEM_ALIGN, num_xfer_desc, USBH_HAL_XFER_DESC_SIZE, MALLOC_CAP_DMA);
if (pipe == NULL|| chan_obj == NULL || xfer_desc_list == NULL) {
ret = ESP_ERR_NO_MEM;
goto err;
}
//Initialize pipe object
TAILQ_INIT(&pipe->pend_xfer_req_tailq);
TAILQ_INIT(&pipe->done_xfer_req_tailq);
pipe->port = port;
pipe->xfer_desc_list = xfer_desc_list;
pipe->flags.xfer_desc_list_len = num_xfer_desc;
pipe->chan_obj = chan_obj;
pipe->ep_char.type = type;
if (is_default_pipe) {
pipe->ep_char.bEndpointAddress = 0;
//Set the default pipe's MPS to the worst case MPS for the device's speed
pipe->ep_char.mps = (pipe_config->dev_speed == USB_SPEED_FULL) ? CTRL_EP_MAX_MPS_FS : CTRL_EP_MAX_MPS_LS;
} else {
pipe->ep_char.bEndpointAddress = pipe_config->ep_desc->bEndpointAddress;
pipe->ep_char.mps = pipe_config->ep_desc->wMaxPacketSize;
}
pipe->ep_char.dev_addr = pipe_config->dev_addr;
pipe->ep_char.ls_via_fs_hub = (port_speed == USB_SPEED_FULL && pipe_config->dev_speed == USB_SPEED_LOW);
pipe->state = HCD_PIPE_STATE_ACTIVE;
pipe->callback = pipe_config->callback;
pipe->callback_arg = pipe_config->callback_arg;
pipe->context = pipe_config->context;
//Allocate channel
HCD_ENTER_CRITICAL();
if (!port->initialized || !port->flags.conn_devc_ena) {
HCD_EXIT_CRITICAL();
ret = ESP_ERR_INVALID_STATE;
goto err;
}
bool chan_allocated = usbh_hal_chan_alloc(port->hal, pipe->chan_obj, (void *) pipe);
if (!chan_allocated) {
HCD_EXIT_CRITICAL();
ret = ESP_ERR_NOT_SUPPORTED;
goto err;
}
usbh_hal_chan_set_ep_char(pipe->chan_obj, &pipe->ep_char);
//Add the pipe to the list of idle pipes in the port object
TAILQ_INSERT_TAIL(&port->pipes_idle_tailq, pipe, tailq_entry);
port->num_pipes_idle++;
HCD_EXIT_CRITICAL();
*pipe_hdl = (hcd_pipe_handle_t)pipe;
return ret;
err:
free(xfer_desc_list);
free(chan_obj);
free(pipe);
return ret;
}
esp_err_t hcd_pipe_free(hcd_pipe_handle_t pipe_hdl)
{
pipe_t *pipe = (pipe_t *)pipe_hdl;
HCD_ENTER_CRITICAL();
//Check that all transfer requests have been removed and pipe has no pending events
HCD_CHECK_FROM_CRIT(pipe->inflight_xfer_req == NULL
&& pipe->num_xfer_req_pending == 0
&& pipe->num_xfer_req_done == 0,
ESP_ERR_INVALID_STATE);
//Remove pipe from the list of idle pipes (it must be in the idle list because it should have no queued transfer requests)
TAILQ_REMOVE(&pipe->port->pipes_idle_tailq, pipe, tailq_entry);
pipe->port->num_pipes_idle--;
usbh_hal_chan_free(pipe->port->hal, pipe->chan_obj);
HCD_EXIT_CRITICAL();
//Free pipe resources
free(pipe->xfer_desc_list);
free(pipe->chan_obj);
free(pipe);
return ESP_OK;
}
esp_err_t hcd_pipe_update(hcd_pipe_handle_t pipe_hdl, uint8_t dev_addr, int mps)
{
pipe_t *pipe = (pipe_t *)pipe_hdl;
HCD_ENTER_CRITICAL();
//Check if pipe is in the correct state to be updated
HCD_CHECK_FROM_CRIT(pipe->state != HCD_PIPE_STATE_INVALID
&& !pipe->flags.pipe_cmd_processing
&& pipe->num_xfer_req_pending == 0
&& pipe->num_xfer_req_done == 0,
ESP_ERR_INVALID_STATE);
//Check that all transfer requests have been removed and pipe has no pending events
pipe->ep_char.dev_addr = dev_addr;
pipe->ep_char.mps = mps;
usbh_hal_chan_set_ep_char(pipe->chan_obj, &pipe->ep_char);
HCD_EXIT_CRITICAL();
return ESP_OK;
}
void *hcd_pipe_get_ctx(hcd_pipe_handle_t pipe_hdl)
{
pipe_t *pipe = (pipe_t *) pipe_hdl;
void *ret;
HCD_ENTER_CRITICAL();
ret = pipe->context;
HCD_EXIT_CRITICAL();
return ret;
}
hcd_pipe_state_t hcd_pipe_get_state(hcd_pipe_handle_t pipe_hdl)
{
hcd_pipe_state_t ret;
pipe_t *pipe = (pipe_t *) pipe_hdl;
HCD_ENTER_CRITICAL();
//If there is no enabled device, all existing pipes are invalid.
if (pipe->port->state != HCD_PORT_STATE_ENABLED
&& pipe->port->state != HCD_PORT_STATE_SUSPENDED
&& pipe->port->state != HCD_PORT_STATE_RESUMING) {
ret = HCD_PIPE_STATE_INVALID;
} else {
ret = pipe->state;
}
HCD_EXIT_CRITICAL();
return ret;
}
esp_err_t hcd_pipe_command(hcd_pipe_handle_t pipe_hdl, hcd_pipe_cmd_t command)
{
pipe_t *pipe = (pipe_t *) pipe_hdl;
bool ret = ESP_OK;
HCD_ENTER_CRITICAL();
//Cannot execute pipe commands the pipe is already executing a command, or if the pipe or its port are no longer valid
if (pipe->flags.pipe_cmd_processing || !pipe->port->flags.conn_devc_ena || pipe->state == HCD_PIPE_STATE_INVALID) {
ret = ESP_ERR_INVALID_STATE;
} else {
pipe->flags.pipe_cmd_processing = 1;
switch (command) {
case HCD_PIPE_CMD_ABORT: {
//Retire all scheduled transfer requests. Pipe's state remains unchanged
if (!_pipe_wait_done(pipe)) { //Stop any on going transfers
ret = ESP_ERR_INVALID_RESPONSE;
break;
}
_pipe_retire(pipe, true); //Retire any pending transfers
break;
}
case HCD_PIPE_CMD_RESET: {
//Retire all scheduled transfer requests. Pipe's state moves to active
if (!_pipe_wait_done(pipe)) { //Stop any on going transfers
ret = ESP_ERR_INVALID_RESPONSE;
break;
}
_pipe_retire(pipe, true); //Retire any pending transfers
pipe->state = HCD_PIPE_STATE_ACTIVE;
break;
}
case HCD_PIPE_CMD_CLEAR: { //Can only do this if port is still active
//Pipe's state moves from halted to active
if (pipe->state == HCD_PIPE_STATE_HALTED) {
pipe->state = HCD_PIPE_STATE_ACTIVE;
//Start the next pending transfer if it exists
if (_pipe_get_next_xfer_req(pipe)) {
//Fill the descriptor list with the transfer request and start the transfer
_xfer_req_fill(pipe);
usbh_hal_chan_activate(pipe->chan_obj, 0); //Start with the first descriptor
}
}
break;
}
case HCD_PIPE_CMD_HALT: {
//Pipe's state moves to halted
if (!_pipe_wait_done(pipe)) { //Stop any on going transfers
ret = ESP_ERR_INVALID_RESPONSE;
break;
}
pipe->state = HCD_PIPE_STATE_HALTED;
break;
}
}
pipe->flags.pipe_cmd_processing = 0;
}
HCD_EXIT_CRITICAL();
return ret;
}
hcd_pipe_event_t hcd_pipe_get_event(hcd_pipe_handle_t pipe_hdl)
{
pipe_t *pipe = (pipe_t *) pipe_hdl;
hcd_pipe_event_t ret;
HCD_ENTER_CRITICAL();
ret = pipe->last_event;
pipe->last_event = HCD_PIPE_EVENT_NONE;
HCD_EXIT_CRITICAL();
return ret;
}
// ----------------------------------------------- HCD Transfer Requests -----------------------------------------------
// ----------------------- Private -------------------------
static void _xfer_req_fill(pipe_t *pipe)
{
//inflight_xfer_req of the pipe must already set to the target transfer request
assert(pipe->inflight_xfer_req != NULL);
//Fill transfer descriptor list with a single transfer request
usb_irp_t *usb_irp = pipe->inflight_xfer_req->irp;
switch (pipe->ep_char.type) {
case USB_XFER_TYPE_CTRL: {
//Get information about the contorl transfer by analyzing the setup packet (the first 8 bytes)
usb_ctrl_req_t *ctrl_req = (usb_ctrl_req_t *)usb_irp->data_buffer;
pipe->flags.ctrl_data_stg_in = ((ctrl_req->bRequestType & USB_B_REQUEST_TYPE_DIR_IN) != 0);
pipe->flags.ctrl_data_stg_skip = (usb_irp->num_bytes == 0);
//Fill setup stage
usbh_hal_xfer_desc_fill(pipe->xfer_desc_list, 0, usb_irp->data_buffer, sizeof(usb_ctrl_req_t),
USBH_HAL_XFER_DESC_FLAG_SETUP | USBH_HAL_XFER_DESC_FLAG_HALT);
if (pipe->flags.ctrl_data_stg_skip) {
//Fill a NULL packet if there is no data stage
usbh_hal_xfer_desc_fill(pipe->xfer_desc_list, 1, NULL, 0, USBH_HAL_XFER_DESC_FLAG_NULL);
} else {
//Fill data stage
usbh_hal_xfer_desc_fill(pipe->xfer_desc_list, 1, usb_irp->data_buffer + sizeof(usb_ctrl_req_t), usb_irp->num_bytes,
((pipe->flags.ctrl_data_stg_in) ? USBH_HAL_XFER_DESC_FLAG_IN : 0) | USBH_HAL_XFER_DESC_FLAG_HALT);
}
//Fill status stage (i.e., a zero length packet). If data stage is skipped, the status stage is always IN.
usbh_hal_xfer_desc_fill(pipe->xfer_desc_list, 2, NULL, 0,
((pipe->flags.ctrl_data_stg_in && !pipe->flags.ctrl_data_stg_skip) ? 0 : USBH_HAL_XFER_DESC_FLAG_IN) | USBH_HAL_XFER_DESC_FLAG_HALT);
//Set the channel's direction to OUT and PID to 0 respectively for the the setup stage
usbh_hal_chan_set_dir(pipe->chan_obj, false); //Setup stage is always OUT
usbh_hal_chan_set_pid(pipe->chan_obj, 0); //Setup stage always has a PID of DATA0
break;
}
case USB_XFER_TYPE_BULK: {
bool is_in = pipe->ep_char.bEndpointAddress & USB_B_ENDPOINT_ADDRESS_EP_DIR_MASK;
usbh_hal_xfer_desc_fill(pipe->xfer_desc_list, 0, usb_irp->data_buffer, usb_irp->num_bytes,
((is_in) ? USBH_HAL_XFER_DESC_FLAG_IN : 0) | USBH_HAL_XFER_DESC_FLAG_HALT);
break;
}
default: {
break; //Isoc and Interrupt transfers not supported yet
}
}
//Claim slot
usbh_hal_chan_slot_acquire(pipe->chan_obj, pipe->xfer_desc_list, pipe->flags.xfer_desc_list_len, (void *)pipe);
}
static void _xfer_req_continue(pipe_t *pipe)
{
int next_idx = usbh_hal_chan_get_next_desc_index(pipe->chan_obj);
bool next_dir_is_in; //Next descriptor direction is IN
int next_pid; //Next PID (DATA0 or DATA 1)
int num_to_skip; //Number of descriptors to skip
if (next_idx == 1) {
//Just finished setup stage
if (pipe->flags.ctrl_data_stg_skip) {
//Skipping data stage. Go straight to status stage
next_dir_is_in = true; //With no data stage, status stage must be IN
next_pid = 1; //Status stage always has a PID of DATA1
num_to_skip = 1; //Skip over the null descriptor representing the skipped data stage
} else {
//Go to data stage
next_dir_is_in = pipe->flags.ctrl_data_stg_in;
next_pid = 1; //Data stage always starts with a PID of DATA1
num_to_skip = 0;
}
} else { //next_idx == 2
//Going to status stage from data stage
next_dir_is_in = !pipe->flags.ctrl_data_stg_in; //Status stage is opposite direction of data stage
next_pid = 1; //Status stage always has a PID of DATA1
num_to_skip = 0;
}
usbh_hal_chan_set_dir(pipe->chan_obj, next_dir_is_in);
usbh_hal_chan_set_pid(pipe->chan_obj, next_pid);
usbh_hal_chan_activate(pipe->chan_obj, num_to_skip); //Start the next stage
}
static void _xfer_req_parse(pipe_t *pipe, bool error_occurred)
{
assert(pipe->inflight_xfer_req != NULL);
//Release the slot
void *xfer_desc_list;
int xfer_desc_len;
usbh_hal_chan_slot_release(pipe->chan_obj, &xfer_desc_list, &xfer_desc_len);
assert(xfer_desc_list == pipe->xfer_desc_list);
(void) xfer_desc_len;
//Parse the transfer descriptor list for the result of the transfer
usb_irp_t *usb_irp = pipe->inflight_xfer_req->irp;
usb_transfer_status_t xfer_status;
int xfer_rem_len;
if (error_occurred) {
//Either a pipe error has occurred or the pipe is no longer valid
if (pipe->state == HCD_PIPE_STATE_INVALID) {
xfer_status = USB_TRANSFER_STATUS_NO_DEVICE;
} else {
//Must have been a pipe error event
switch (pipe->last_event) {
case HCD_PIPE_EVENT_ERROR_XFER: //Excessive transaction error
xfer_status = USB_TRANSFER_STATUS_ERROR;
break;
case HCD_PIPE_EVENT_ERROR_OVERFLOW:
xfer_status = USB_TRANSFER_STATUS_OVERFLOW;
break;
case HCD_PIPE_EVENT_ERROR_STALL:
xfer_status = USB_TRANSFER_STATUS_STALL;
break;
default:
//HCD_PIPE_EVENT_ERROR_XFER_NOT_AVAIL should never occur
abort();
break;
}
}
//We assume no bytes transmitted because of an error.
xfer_rem_len = usb_irp->num_bytes;
} else {
int desc_status;
switch (pipe->ep_char.type) {
case USB_XFER_TYPE_CTRL: {
if (pipe->flags.ctrl_data_stg_skip) {
//There was no data stage. Just set it as successful
desc_status = USBH_HAL_XFER_DESC_STS_SUCCESS;
xfer_rem_len = 0;
} else {
//Check the data stage (index 1)
usbh_hal_xfer_desc_parse(pipe->xfer_desc_list, 1, &xfer_rem_len, &desc_status);
}
break;
}
case USB_XFER_TYPE_BULK: {
usbh_hal_xfer_desc_parse(pipe->xfer_desc_list, 0, &xfer_rem_len, &desc_status);
break;
}
default: {
//We don't supportISOC and INTR pipes yet
desc_status = USBH_HAL_XFER_DESC_STS_NOT_EXECUTED;
xfer_rem_len = 0;
xfer_status = USB_TRANSFER_STATUS_ERROR;
abort();
break;
}
}
xfer_status = USB_TRANSFER_STATUS_COMPLETED;
assert(desc_status == USBH_HAL_XFER_DESC_STS_SUCCESS);
}
//Write back results to IRP
usb_irp->actual_num_bytes = usb_irp->num_bytes - xfer_rem_len;
usb_irp->status = xfer_status;
}
// ----------------------- Public --------------------------
hcd_xfer_req_handle_t hcd_xfer_req_alloc()
{
xfer_req_t *xfer_req = calloc(1, sizeof(xfer_req_t));
xfer_req->state = XFER_REQ_STATE_IDLE;
return (hcd_xfer_req_handle_t) xfer_req;
}
void hcd_xfer_req_free(hcd_xfer_req_handle_t req_hdl)
{
if (req_hdl == NULL) {
return;
}
xfer_req_t *xfer_req = (xfer_req_t *) req_hdl;
//Cannot free a transfer request that is still being used
assert(xfer_req->state == XFER_REQ_STATE_IDLE);
free(xfer_req);
}
void hcd_xfer_req_set_target(hcd_xfer_req_handle_t req_hdl, hcd_pipe_handle_t pipe_hdl, usb_irp_t *irp, void *context)
{
xfer_req_t *xfer_req = (xfer_req_t *) req_hdl;
//Can only set an transfer request's target when the transfer request is idl
assert(xfer_req->state == XFER_REQ_STATE_IDLE);
xfer_req->pipe = (pipe_t *) pipe_hdl;
xfer_req->irp = irp;
xfer_req->context = context;
}
void hcd_xfer_req_get_target(hcd_xfer_req_handle_t req_hdl, hcd_pipe_handle_t *pipe_hdl, usb_irp_t **irp, void **context)
{
xfer_req_t *xfer_req = (xfer_req_t *) req_hdl;
*pipe_hdl = (hcd_pipe_handle_t) xfer_req->pipe;
*irp = xfer_req->irp;
*context = xfer_req->context;
}
esp_err_t hcd_xfer_req_enqueue(hcd_xfer_req_handle_t req_hdl)
{
xfer_req_t *xfer_req = (xfer_req_t *) req_hdl;
HCD_CHECK(xfer_req->pipe != NULL && xfer_req->irp != NULL //The transfer request's target must be set
&& xfer_req->state == XFER_REQ_STATE_IDLE, //The transfer request cannot be already enqueued
ESP_ERR_INVALID_STATE);
pipe_t *pipe = xfer_req->pipe;
HCD_ENTER_CRITICAL();
HCD_CHECK_FROM_CRIT(pipe->port->state == HCD_PORT_STATE_ENABLED //The pipe's port must be in the correct state
&& pipe->state == HCD_PIPE_STATE_ACTIVE //The pipe must be in the correct state
&& !pipe->flags.pipe_cmd_processing, //Pipe cannot currently be processing a pipe command
ESP_ERR_INVALID_STATE);
//Check if we can start execution on the pipe immediately
if (!pipe->flags.paused && pipe->num_xfer_req_pending == 0 && pipe->inflight_xfer_req == NULL) {
//Pipe isn't executing any transfers. Start immediately
pipe->inflight_xfer_req = xfer_req;
_xfer_req_fill(pipe);
usbh_hal_chan_activate(pipe->chan_obj, 0); //Start with the first descriptor
xfer_req->state = XFER_REQ_STATE_INFLIGHT;
if (pipe->num_xfer_req_done == 0) {
//This is the first transfer request to be enqueued into the pipe. Move the pipe to the list of queued pipes
TAILQ_REMOVE(&pipe->port->pipes_idle_tailq, pipe, tailq_entry);
TAILQ_INSERT_TAIL(&pipe->port->pipes_queued_tailq, pipe, tailq_entry);
pipe->port->num_pipes_idle--;
pipe->port->num_pipes_queued++;
}
} else {
//Add the transfer request to the pipe's pending tailq
TAILQ_INSERT_TAIL(&pipe->pend_xfer_req_tailq, xfer_req, tailq_entry);
pipe->num_xfer_req_pending++;
xfer_req->state = XFER_REQ_STATE_PENDING;
}
HCD_EXIT_CRITICAL();
return ESP_OK;
}
hcd_xfer_req_handle_t hcd_xfer_req_dequeue(hcd_pipe_handle_t pipe_hdl)
{
pipe_t *pipe = (pipe_t *)pipe_hdl;
hcd_xfer_req_handle_t ret;
HCD_ENTER_CRITICAL();
if (pipe->num_xfer_req_done > 0) {
xfer_req_t *xfer_req = TAILQ_FIRST(&pipe->done_xfer_req_tailq);
TAILQ_REMOVE(&pipe->done_xfer_req_tailq, xfer_req, tailq_entry);
pipe->num_xfer_req_done--;
assert(xfer_req->state == XFER_REQ_STATE_DONE);
xfer_req->state = XFER_REQ_STATE_IDLE;
ret = (hcd_xfer_req_handle_t) xfer_req;
if (pipe->num_xfer_req_done == 0 && pipe->num_xfer_req_pending == 0) {
//This pipe has no more enqueued transfers. Move the pipe to the list of idle pipes
TAILQ_REMOVE(&pipe->port->pipes_queued_tailq, pipe, tailq_entry);
TAILQ_INSERT_TAIL(&pipe->port->pipes_idle_tailq, pipe, tailq_entry);
pipe->port->num_pipes_idle++;
pipe->port->num_pipes_queued--;
}
} else {
ret = NULL;
}
HCD_EXIT_CRITICAL();
return ret;
}
esp_err_t hcd_xfer_req_abort(hcd_xfer_req_handle_t req_hdl)
{
xfer_req_t *xfer_req = (xfer_req_t *) req_hdl;
esp_err_t ret;
HCD_ENTER_CRITICAL();
switch (xfer_req->state) {
case XFER_REQ_STATE_PENDING: {
//Transfer request has not been executed so it can be aborted
pipe_t *pipe = xfer_req->pipe;
//Remove it form the pending queue
TAILQ_REMOVE(&pipe->pend_xfer_req_tailq, xfer_req, tailq_entry);
pipe->num_xfer_req_pending--;
//Add it to the done queue
TAILQ_INSERT_TAIL(&pipe->done_xfer_req_tailq, xfer_req, tailq_entry);
pipe->num_xfer_req_done++;
//Update the transfer request and associated IRP's status
xfer_req->state = XFER_REQ_STATE_DONE;
xfer_req->irp->status = USB_TRANSFER_STATUS_CANCELLED;
ret = ESP_OK;
break;
}
case XFER_REQ_STATE_IDLE: {
//Cannot abort a transfer request that was never enqueued
ret = ESP_ERR_INVALID_STATE;
break;
}
default :{
//Transfer request is currently or has already been executed. Nothing to do.
ret = ESP_OK;
break;
}
}
HCD_EXIT_CRITICAL();
return ret;
}
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