kopia lustrzana https://github.com/micropython/micropython
247 wiersze
9.0 KiB
C
247 wiersze
9.0 KiB
C
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2020-2021 Damien P. George
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include "py/runtime.h"
|
|
#include "py/stream.h"
|
|
#include "py/mphal.h"
|
|
#include "py/mperrno.h"
|
|
#include "modmachine.h"
|
|
|
|
#include "hardware/uart.h"
|
|
|
|
#define DEFAULT_UART_BAUDRATE (115200)
|
|
#define DEFAULT_UART_BITS (8)
|
|
#define DEFAULT_UART_STOP (1)
|
|
#define DEFAULT_UART0_TX (0)
|
|
#define DEFAULT_UART0_RX (1)
|
|
#define DEFAULT_UART1_TX (4)
|
|
#define DEFAULT_UART1_RX (5)
|
|
|
|
#define IS_VALID_PERIPH(uart, pin) (((((pin) + 4) & 8) >> 3) == (uart))
|
|
#define IS_VALID_TX(uart, pin) (((pin) & 3) == 0 && IS_VALID_PERIPH(uart, pin))
|
|
#define IS_VALID_RX(uart, pin) (((pin) & 3) == 1 && IS_VALID_PERIPH(uart, pin))
|
|
|
|
typedef struct _machine_uart_obj_t {
|
|
mp_obj_base_t base;
|
|
uart_inst_t *const uart;
|
|
uint8_t uart_id;
|
|
uint32_t baudrate;
|
|
uint8_t bits;
|
|
uart_parity_t parity;
|
|
uint8_t stop;
|
|
uint8_t tx;
|
|
uint8_t rx;
|
|
} machine_uart_obj_t;
|
|
|
|
STATIC machine_uart_obj_t machine_uart_obj[] = {
|
|
{{&machine_uart_type}, uart0, 0, 0, DEFAULT_UART_BITS, UART_PARITY_NONE, DEFAULT_UART_STOP, DEFAULT_UART0_TX, DEFAULT_UART0_RX},
|
|
{{&machine_uart_type}, uart1, 1, 0, DEFAULT_UART_BITS, UART_PARITY_NONE, DEFAULT_UART_STOP, DEFAULT_UART1_TX, DEFAULT_UART1_RX},
|
|
};
|
|
|
|
STATIC const char *_parity_name[] = {"None", "0", "1"};
|
|
|
|
/******************************************************************************/
|
|
// MicroPython bindings for UART
|
|
|
|
STATIC void machine_uart_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
|
|
machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
|
|
mp_printf(print, "UART(%u, baudrate=%u, bits=%u, parity=%s, stop=%u, tx=%d, rx=%d)",
|
|
self->uart_id, self->baudrate, self->bits, _parity_name[self->parity],
|
|
self->stop, self->tx, self->rx);
|
|
}
|
|
|
|
STATIC mp_obj_t machine_uart_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
|
|
enum { ARG_id, ARG_baudrate, ARG_bits, ARG_parity, ARG_stop, ARG_tx, ARG_rx };
|
|
static const mp_arg_t allowed_args[] = {
|
|
{ MP_QSTR_id, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
|
|
{ MP_QSTR_baudrate, MP_ARG_INT, {.u_int = -1} },
|
|
{ MP_QSTR_bits, MP_ARG_INT, {.u_int = -1} },
|
|
{ MP_QSTR_parity, MP_ARG_OBJ, {.u_rom_obj = MP_ROM_INT(-1)} },
|
|
{ MP_QSTR_stop, MP_ARG_INT, {.u_int = -1} },
|
|
{ MP_QSTR_tx, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
|
|
{ MP_QSTR_rx, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
|
|
};
|
|
|
|
// Parse args.
|
|
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
|
|
mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
|
|
|
|
// Get UART bus.
|
|
int uart_id = mp_obj_get_int(args[ARG_id].u_obj);
|
|
if (uart_id < 0 || uart_id >= MP_ARRAY_SIZE(machine_uart_obj)) {
|
|
mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("UART(%d) doesn't exist"), uart_id);
|
|
}
|
|
|
|
// Get static peripheral object.
|
|
machine_uart_obj_t *self = (machine_uart_obj_t *)&machine_uart_obj[uart_id];
|
|
|
|
// Set baudrate if configured.
|
|
if (args[ARG_baudrate].u_int > 0) {
|
|
self->baudrate = args[ARG_baudrate].u_int;
|
|
}
|
|
|
|
// Set bits if configured.
|
|
if (args[ARG_bits].u_int > 0) {
|
|
self->bits = args[ARG_bits].u_int;
|
|
}
|
|
|
|
// Set parity if configured.
|
|
if (args[ARG_parity].u_obj != MP_OBJ_NEW_SMALL_INT(-1)) {
|
|
if (args[ARG_parity].u_obj == mp_const_none) {
|
|
self->parity = UART_PARITY_NONE;
|
|
} else if (mp_obj_get_int(args[ARG_parity].u_obj) & 1) {
|
|
self->parity = UART_PARITY_ODD;
|
|
} else {
|
|
self->parity = UART_PARITY_EVEN;
|
|
}
|
|
}
|
|
|
|
// Set stop bits if configured.
|
|
if (args[ARG_stop].u_int > 0) {
|
|
self->stop = args[ARG_stop].u_int;
|
|
}
|
|
|
|
// Set TX/RX pins if configured.
|
|
if (args[ARG_tx].u_obj != mp_const_none) {
|
|
int tx = mp_hal_get_pin_obj(args[ARG_tx].u_obj);
|
|
if (!IS_VALID_TX(self->uart_id, tx)) {
|
|
mp_raise_ValueError(MP_ERROR_TEXT("bad TX pin"));
|
|
}
|
|
self->tx = tx;
|
|
}
|
|
if (args[ARG_rx].u_obj != mp_const_none) {
|
|
int rx = mp_hal_get_pin_obj(args[ARG_rx].u_obj);
|
|
if (!IS_VALID_RX(self->uart_id, rx)) {
|
|
mp_raise_ValueError(MP_ERROR_TEXT("bad RX pin"));
|
|
}
|
|
self->rx = rx;
|
|
}
|
|
|
|
// Initialise the UART peripheral if any arguments given, or it was not initialised previously.
|
|
if (n_args > 1 || n_kw > 0 || self->baudrate == 0) {
|
|
if (self->baudrate == 0) {
|
|
self->baudrate = DEFAULT_UART_BAUDRATE;
|
|
}
|
|
uart_init(self->uart, self->baudrate);
|
|
uart_set_format(self->uart, self->bits, self->stop, self->parity);
|
|
uart_set_fifo_enabled(self->uart, true);
|
|
gpio_set_function(self->tx, GPIO_FUNC_UART);
|
|
gpio_set_function(self->rx, GPIO_FUNC_UART);
|
|
}
|
|
|
|
return MP_OBJ_FROM_PTR(self);
|
|
}
|
|
|
|
STATIC mp_obj_t machine_uart_any(mp_obj_t self_in) {
|
|
machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
|
|
return MP_OBJ_NEW_SMALL_INT(uart_is_readable(self->uart));
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_uart_any_obj, machine_uart_any);
|
|
|
|
STATIC mp_obj_t machine_uart_sendbreak(mp_obj_t self_in) {
|
|
machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
|
|
uart_set_break(self->uart, true);
|
|
mp_hal_delay_us(13000000 / self->baudrate + 1);
|
|
uart_set_break(self->uart, false);
|
|
return mp_const_none;
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_uart_sendbreak_obj, machine_uart_sendbreak);
|
|
|
|
STATIC const mp_rom_map_elem_t machine_uart_locals_dict_table[] = {
|
|
{ MP_ROM_QSTR(MP_QSTR_any), MP_ROM_PTR(&machine_uart_any_obj) },
|
|
|
|
{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) },
|
|
|
|
{ MP_ROM_QSTR(MP_QSTR_sendbreak), MP_ROM_PTR(&machine_uart_sendbreak_obj) },
|
|
};
|
|
STATIC MP_DEFINE_CONST_DICT(machine_uart_locals_dict, machine_uart_locals_dict_table);
|
|
|
|
STATIC mp_uint_t machine_uart_read(mp_obj_t self_in, void *buf_in, mp_uint_t size, int *errcode) {
|
|
machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
|
|
// TODO support timeout
|
|
uint8_t *dest = buf_in;
|
|
for (size_t i = 0; i < size; ++i) {
|
|
while (!uart_is_readable(self->uart)) {
|
|
MICROPY_EVENT_POLL_HOOK
|
|
}
|
|
*dest++ = uart_get_hw(self->uart)->dr;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
STATIC mp_uint_t machine_uart_write(mp_obj_t self_in, const void *buf_in, mp_uint_t size, int *errcode) {
|
|
machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
|
|
// TODO support timeout
|
|
const uint8_t *src = buf_in;
|
|
for (size_t i = 0; i < size; ++i) {
|
|
while (!uart_is_writable(self->uart)) {
|
|
MICROPY_EVENT_POLL_HOOK
|
|
}
|
|
uart_get_hw(self->uart)->dr = *src++;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
STATIC mp_uint_t machine_uart_ioctl(mp_obj_t self_in, mp_uint_t request, mp_uint_t arg, int *errcode) {
|
|
machine_uart_obj_t *self = self_in;
|
|
mp_uint_t ret;
|
|
if (request == MP_STREAM_POLL) {
|
|
uintptr_t flags = arg;
|
|
ret = 0;
|
|
if ((flags & MP_STREAM_POLL_RD) && uart_is_readable(self->uart)) {
|
|
ret |= MP_STREAM_POLL_RD;
|
|
}
|
|
if ((flags & MP_STREAM_POLL_WR) && uart_is_writable(self->uart)) {
|
|
ret |= MP_STREAM_POLL_WR;
|
|
}
|
|
} else {
|
|
*errcode = MP_EINVAL;
|
|
ret = MP_STREAM_ERROR;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
STATIC const mp_stream_p_t uart_stream_p = {
|
|
.read = machine_uart_read,
|
|
.write = machine_uart_write,
|
|
.ioctl = machine_uart_ioctl,
|
|
.is_text = false,
|
|
};
|
|
|
|
const mp_obj_type_t machine_uart_type = {
|
|
{ &mp_type_type },
|
|
.name = MP_QSTR_UART,
|
|
.print = machine_uart_print,
|
|
.make_new = machine_uart_make_new,
|
|
.getiter = mp_identity_getiter,
|
|
.iternext = mp_stream_unbuffered_iter,
|
|
.protocol = &uart_stream_p,
|
|
.locals_dict = (mp_obj_dict_t *)&machine_uart_locals_dict,
|
|
};
|