micropython/ports/zephyr/machine_uart.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Damien P. George
* Copyright (c) 2020 Yonatan Schachter
*
* 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 <stdio.h>
#include <stdint.h>
#include <string.h>
#include <zephyr/zephyr.h>
#include <zephyr/drivers/uart.h>
#include "py/runtime.h"
#include "py/stream.h"
#include "py/mperrno.h"
#include "py/objstr.h"
#include "modmachine.h"
typedef struct _machine_uart_obj_t {
mp_obj_base_t base;
const struct device *dev;
uint16_t timeout; // timeout waiting for first char (in ms)
uint16_t timeout_char; // timeout waiting between chars (in ms)
} machine_uart_obj_t;
STATIC const char *_parity_name[] = {"None", "Odd", "Even", "Mark", "Space"};
STATIC const char *_stop_bits_name[] = {"0.5", "1", "1.5", "2"};
STATIC const char *_data_bits_name[] = {"5", "6", "7", "8", "9"};
STATIC const char *_flow_control_name[] = {"None", "RTS/CTS", "DTR/DSR"};
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);
struct uart_config config;
uart_config_get(self->dev, &config);
mp_printf(print, "UART(\"%s\", baudrate=%u, data_bits=%s, parity_bits=%s, stop_bits=%s, flow_control=%s, timeout=%u, timeout_char=%u)",
self->dev->name, config.baudrate, _data_bits_name[config.data_bits],
_parity_name[config.parity], _stop_bits_name[config.stop_bits], _flow_control_name[config.flow_ctrl],
self->timeout, self->timeout_char);
}
STATIC void machine_uart_init_helper(machine_uart_obj_t *self, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_timeout, ARG_timeout_char };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_timeout_char, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
self->timeout = args[ARG_timeout].u_int;
self->timeout_char = args[ARG_timeout_char].u_int;
}
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 *args) {
mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
machine_uart_obj_t *self = mp_obj_malloc(machine_uart_obj_t, &machine_uart_type);
self->dev = device_get_binding(mp_obj_str_get_str(args[0]));
if (!self->dev) {
mp_raise_ValueError(MP_ERROR_TEXT("Bad device name"));
}
mp_map_t kw_args;
mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
machine_uart_init_helper(self, n_args - 1, args + 1, &kw_args);
return MP_OBJ_FROM_PTR(self);
}
STATIC const mp_rom_map_elem_t machine_uart_locals_dict_table[] = {
{ 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) },
};
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);
uint8_t *buffer = (uint8_t *)buf_in;
uint8_t data;
mp_uint_t bytes_read = 0;
size_t elapsed_ms = 0;
size_t time_to_wait = self->timeout;
while ((elapsed_ms < time_to_wait) && (bytes_read < size)) {
if (!uart_poll_in(self->dev, &data)) {
buffer[bytes_read++] = data;
elapsed_ms = 0;
time_to_wait = self->timeout_char;
} else {
k_msleep(1);
elapsed_ms++;
}
}
return bytes_read;
}
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);
uint8_t *buffer = (uint8_t *)buf_in;
for (mp_uint_t i = 0; i < size; i++) {
uart_poll_out(self->dev, buffer[i]);
}
return size;
}
STATIC mp_uint_t machine_uart_ioctl(mp_obj_t self_in, mp_uint_t request, uintptr_t arg, int *errcode) {
mp_uint_t ret;
if (request == MP_STREAM_POLL) {
ret = 0;
// read is always blocking
if (arg & MP_STREAM_POLL_WR) {
ret |= MP_STREAM_POLL_WR;
}
return ret;
} 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,
};
MP_DEFINE_CONST_OBJ_TYPE(
machine_uart_type,
MP_QSTR_UART,
MP_TYPE_FLAG_NONE,
machine_uart_make_new,
print, machine_uart_print,
getiter, mp_identity_getiter,
iternext, mp_stream_unbuffered_iter,
protocol, &uart_stream_p,
locals_dict, &machine_uart_locals_dict
);