169 lines
6.1 KiB
C
169 lines
6.1 KiB
C
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/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Damien P. George
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* Copyright (c) 2020 Yonatan Schachter
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <zephyr.h>
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#include <drivers/uart.h>
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#include "py/runtime.h"
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#include "py/stream.h"
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#include "py/mperrno.h"
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#include "py/objstr.h"
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#include "modmachine.h"
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typedef struct _machine_uart_obj_t {
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mp_obj_base_t base;
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const struct device *dev;
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uint16_t timeout; // timeout waiting for first char (in ms)
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uint16_t timeout_char; // timeout waiting between chars (in ms)
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} machine_uart_obj_t;
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STATIC const char *_parity_name[] = {"None", "Odd", "Even", "Mark", "Space"};
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STATIC const char *_stop_bits_name[] = {"0.5", "1", "1.5", "2"};
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STATIC const char *_data_bits_name[] = {"5", "6", "7", "8", "9"};
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STATIC const char *_flow_control_name[] = {"None", "RTS/CTS", "DTR/DSR"};
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STATIC void machine_uart_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
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struct uart_config config;
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uart_config_get(self->dev, &config);
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mp_printf(print, "UART(\"%s\", baudrate=%u, data_bits=%s, parity_bits=%s, stop_bits=%s, flow_control=%s, timeout=%u, timeout_char=%u)",
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self->dev->name, config.baudrate, _data_bits_name[config.data_bits],
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_parity_name[config.parity], _stop_bits_name[config.stop_bits], _flow_control_name[config.flow_ctrl],
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self->timeout, self->timeout_char);
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}
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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) {
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enum { ARG_timeout, ARG_timeout_char };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_timeout_char, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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self->timeout = args[ARG_timeout].u_int;
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self->timeout_char = args[ARG_timeout_char].u_int;
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}
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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) {
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mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
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GET_STR_DATA_LEN(args[0], name, name_len);
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machine_uart_obj_t *self = m_new_obj(machine_uart_obj_t);
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self->base.type = &machine_uart_type;
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self->dev = device_get_binding(name);
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if (!self->dev) {
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mp_raise_ValueError(MP_ERROR_TEXT("Bad device name"));
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}
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mp_map_t kw_args;
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mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
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machine_uart_init_helper(self, n_args - 1, args + 1, &kw_args);
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return MP_OBJ_FROM_PTR(self);
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}
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STATIC const mp_rom_map_elem_t machine_uart_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
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{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(machine_uart_locals_dict, machine_uart_locals_dict_table);
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STATIC mp_uint_t machine_uart_read(mp_obj_t self_in, void *buf_in, mp_uint_t size, int *errcode) {
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machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
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uint8_t *buffer = (uint8_t *)buf_in;
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uint8_t data;
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mp_uint_t bytes_read = 0;
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size_t elapsed_ms = 0;
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size_t time_to_wait = self->timeout;
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while ((elapsed_ms < time_to_wait) && (bytes_read < size)) {
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if (!uart_poll_in(self->dev, &data)) {
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buffer[bytes_read++] = data;
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elapsed_ms = 0;
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time_to_wait = self->timeout_char;
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} else {
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k_msleep(1);
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elapsed_ms++;
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}
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}
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return bytes_read;
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}
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STATIC mp_uint_t machine_uart_write(mp_obj_t self_in, const void *buf_in, mp_uint_t size, int *errcode) {
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machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
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uint8_t *buffer = (uint8_t *)buf_in;
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for (mp_uint_t i = 0; i < size; i++) {
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uart_poll_out(self->dev, buffer[i]);
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}
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return size;
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}
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STATIC mp_uint_t machine_uart_ioctl(mp_obj_t self_in, mp_uint_t request, mp_uint_t arg, int *errcode) {
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mp_uint_t ret;
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if (request == MP_STREAM_POLL) {
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ret = 0;
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// read is always blocking
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if (arg & MP_STREAM_POLL_WR) {
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ret |= MP_STREAM_POLL_WR;
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}
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return ret;
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} else {
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*errcode = MP_EINVAL;
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ret = MP_STREAM_ERROR;
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}
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return ret;
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}
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STATIC const mp_stream_p_t uart_stream_p = {
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.read = machine_uart_read,
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.write = machine_uart_write,
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.ioctl = machine_uart_ioctl,
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.is_text = false,
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};
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const mp_obj_type_t machine_uart_type = {
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{ &mp_type_type },
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.name = MP_QSTR_UART,
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.print = machine_uart_print,
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.make_new = machine_uart_make_new,
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.getiter = mp_identity_getiter,
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.iternext = mp_stream_unbuffered_iter,
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.protocol = &uart_stream_p,
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.locals_dict = (mp_obj_dict_t *)&machine_uart_locals_dict,
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};
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