kopia lustrzana https://github.com/micropython/micropython
112 wiersze
3.9 KiB
C
112 wiersze
3.9 KiB
C
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* Taken from ST Cube library and heavily modified. See below for original
|
|
* copyright header.
|
|
*/
|
|
|
|
/**
|
|
******************************************************************************
|
|
* @file USB_Device/CDC_Standalone/Src/usbd_cdc_interface.c
|
|
* @author MCD Application Team
|
|
* @version V1.0.1
|
|
* @date 26-February-2014
|
|
* @brief Source file for USBD CDC interface
|
|
******************************************************************************
|
|
* @attention
|
|
*
|
|
* <h2><center>© COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
|
|
*
|
|
* Licensed under MCD-ST Liberty SW License Agreement V2, (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.st.com/software_license_agreement_liberty_v2
|
|
*
|
|
* 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.
|
|
*
|
|
******************************************************************************
|
|
*/
|
|
|
|
/* Includes ------------------------------------------------------------------*/
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "usbd_cdc_msc_hid.h"
|
|
#include "usbd_hid_interface.h"
|
|
|
|
#include "py/obj.h"
|
|
#include "irq.h"
|
|
#include "usb.h"
|
|
|
|
/* Private variables ---------------------------------------------------------*/
|
|
|
|
static __IO uint8_t dev_is_connected = 0; // indicates if we are connected
|
|
|
|
static uint8_t buffer[2][HID_DATA_FS_MAX_PACKET_SIZE]; // pair of buffers to read individual packets into
|
|
static int8_t current_read_buffer = 0; // which buffer to read from
|
|
static uint32_t last_read_len; // length of last read
|
|
static int8_t current_write_buffer = 0; // which buffer to write to
|
|
|
|
|
|
/* Private function prototypes -----------------------------------------------*/
|
|
static int8_t HID_Itf_Receive (uint8_t* pbuf, uint32_t Len);
|
|
|
|
const USBD_HID_ItfTypeDef USBD_HID_fops = {
|
|
HID_Itf_Receive
|
|
};
|
|
|
|
/**
|
|
* @brief HID_Itf_Receive
|
|
* Data received over USB OUT endpoint is processed here.
|
|
* @param Buf: Buffer of data received
|
|
* @param Len: Number of data received (in bytes)
|
|
* @retval Result of the opeartion: USBD_OK if all operations are OK else USBD_FAIL
|
|
* @note The buffer we are passed here is just UserRxBuffer, so we are
|
|
* free to modify it.
|
|
*/
|
|
static int8_t HID_Itf_Receive(uint8_t* Buf, uint32_t Len) {
|
|
current_write_buffer = !current_write_buffer;
|
|
last_read_len = Len;
|
|
// initiate next USB packet transfer, to append to existing data in buffer
|
|
USBD_HID_SetRxBuffer(&hUSBDDevice, buffer[current_write_buffer]);
|
|
USBD_HID_ReceivePacket(&hUSBDDevice);
|
|
|
|
return USBD_OK;
|
|
}
|
|
|
|
// timout in milliseconds.
|
|
// Returns number of bytes read from the device.
|
|
int USBD_HID_Rx(uint8_t *buf, uint32_t len, uint32_t timeout) {
|
|
// Wait until we have buffer to read
|
|
uint32_t start = HAL_GetTick();
|
|
while (current_read_buffer == current_write_buffer) {
|
|
// Wraparound of tick is taken care of by 2's complement arithmetic.
|
|
if (HAL_GetTick() - start >= timeout) {
|
|
// timeout
|
|
return 0;
|
|
}
|
|
if (query_irq() == IRQ_STATE_DISABLED) {
|
|
// IRQs disabled so buffer will never be filled; return immediately
|
|
return 0;
|
|
}
|
|
__WFI(); // enter sleep mode, waiting for interrupt
|
|
}
|
|
|
|
// There is not enough space in buffer
|
|
if (len < last_read_len) {
|
|
return 0;
|
|
}
|
|
|
|
// Copy bytes from device to user buffer
|
|
memcpy(buf, buffer[current_read_buffer], last_read_len);
|
|
current_read_buffer = !current_read_buffer;
|
|
|
|
// Success, return number of bytes read
|
|
return last_read_len;
|
|
}
|