f28f8ba568
This was done to allow greatly granularity when deciding what functionality is built into each board's build. For example, this way pulseio can be omitted to allow for something else such as touchio.
279 lines
9.1 KiB
C
279 lines
9.1 KiB
C
/*
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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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*
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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 "ets_sys.h"
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#include "espuart.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 "modmachine.h"
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// UartDev is defined and initialized in rom code.
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extern UartDevice UartDev;
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typedef struct _pyb_uart_obj_t {
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mp_obj_base_t base;
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uint8_t uart_id;
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uint8_t bits;
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uint8_t parity;
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uint8_t stop;
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uint32_t baudrate;
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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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} pyb_uart_obj_t;
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STATIC const char *_parity_name[] = {"None", "1", "0"};
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/******************************************************************************/
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// MicroPython bindings for UART
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STATIC void pyb_uart_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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pyb_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_printf(print, "UART(%u, baudrate=%u, bits=%u, parity=%s, stop=%u, timeout=%u, timeout_char=%u)",
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self->uart_id, self->baudrate, self->bits, _parity_name[self->parity],
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self->stop, self->timeout, self->timeout_char);
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}
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STATIC void pyb_uart_init_helper(pyb_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_baudrate, ARG_bits, ARG_parity, ARG_stop, ARG_timeout, ARG_timeout_char };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_baudrate, MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_bits, MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_parity, MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_stop, MP_ARG_INT, {.u_int = 0} },
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//{ MP_QSTR_tx, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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//{ MP_QSTR_rx, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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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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// set baudrate
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if (args[ARG_baudrate].u_int > 0) {
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self->baudrate = args[ARG_baudrate].u_int;
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UartDev.baut_rate = self->baudrate; // Sic!
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}
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// set data bits
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switch (args[ARG_bits].u_int) {
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case 0:
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break;
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case 5:
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UartDev.data_bits = UART_FIVE_BITS;
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self->bits = 5;
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break;
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case 6:
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UartDev.data_bits = UART_SIX_BITS;
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self->bits = 6;
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break;
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case 7:
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UartDev.data_bits = UART_SEVEN_BITS;
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self->bits = 7;
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break;
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case 8:
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UartDev.data_bits = UART_EIGHT_BITS;
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self->bits = 8;
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break;
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default:
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "invalid data bits"));
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break;
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}
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// set parity
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if (args[ARG_parity].u_obj != MP_OBJ_NULL) {
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if (args[ARG_parity].u_obj == mp_const_none) {
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UartDev.parity = UART_NONE_BITS;
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UartDev.exist_parity = UART_STICK_PARITY_DIS;
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self->parity = 0;
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} else {
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mp_int_t parity = mp_obj_get_int(args[ARG_parity].u_obj);
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UartDev.exist_parity = UART_STICK_PARITY_EN;
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if (parity & 1) {
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UartDev.parity = UART_ODD_BITS;
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self->parity = 1;
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} else {
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UartDev.parity = UART_EVEN_BITS;
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self->parity = 2;
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}
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}
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}
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// set stop bits
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switch (args[ARG_stop].u_int) {
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case 0:
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break;
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case 1:
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UartDev.stop_bits = UART_ONE_STOP_BIT;
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self->stop = 1;
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break;
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case 2:
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UartDev.stop_bits = UART_TWO_STOP_BIT;
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self->stop = 2;
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break;
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default:
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "invalid stop bits"));
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break;
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}
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// set timeout
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self->timeout = args[ARG_timeout].u_int;
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// set timeout_char
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// make sure it is at least as long as a whole character (13 bits to be safe)
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self->timeout_char = args[ARG_timeout_char].u_int;
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uint32_t min_timeout_char = 13000 / self->baudrate + 1;
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if (self->timeout_char < min_timeout_char) {
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self->timeout_char = min_timeout_char;
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}
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// setup
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uart_setup(self->uart_id);
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}
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STATIC mp_obj_t pyb_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 uart id
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mp_int_t uart_id = mp_obj_get_int(args[0]);
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if (uart_id != 0 && uart_id != 1) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "UART(%d) does not exist", uart_id));
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}
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// create instance
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pyb_uart_obj_t *self = m_new_obj(pyb_uart_obj_t);
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self->base.type = &pyb_uart_type;
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self->uart_id = uart_id;
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self->baudrate = 115200;
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self->bits = 8;
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self->parity = 0;
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self->stop = 1;
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self->timeout = 0;
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self->timeout_char = 0;
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// init the peripheral
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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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pyb_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 mp_obj_t pyb_uart_init(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
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pyb_uart_init_helper(args[0], n_args - 1, args + 1, kw_args);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_KW(pyb_uart_init_obj, 1, pyb_uart_init);
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STATIC const mp_rom_map_elem_t pyb_uart_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&pyb_uart_init_obj) },
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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(pyb_uart_locals_dict, pyb_uart_locals_dict_table);
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STATIC mp_uint_t pyb_uart_read(mp_obj_t self_in, void *buf_in, mp_uint_t size, int *errcode) {
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pyb_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
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if (self->uart_id == 1) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError, "UART(1) can't read"));
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}
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// make sure we want at least 1 char
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if (size == 0) {
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return 0;
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}
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// wait for first char to become available
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if (!uart_rx_wait(self->timeout * 1000)) {
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*errcode = MP_EAGAIN;
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return MP_STREAM_ERROR;
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}
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// read the data
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uint8_t *buf = buf_in;
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for (;;) {
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*buf++ = uart_rx_char();
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if (--size == 0 || !uart_rx_wait(self->timeout_char * 1000)) {
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// return number of bytes read
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return buf - (uint8_t*)buf_in;
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}
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}
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}
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STATIC mp_uint_t pyb_uart_write(mp_obj_t self_in, const void *buf_in, mp_uint_t size, int *errcode) {
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pyb_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
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const byte *buf = buf_in;
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/* TODO implement non-blocking
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// wait to be able to write the first character
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if (!uart_tx_wait(self, timeout)) {
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*errcode = EAGAIN;
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return MP_STREAM_ERROR;
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}
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*/
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// write the data
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for (size_t i = 0; i < size; ++i) {
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uart_tx_one_char(self->uart_id, *buf++);
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}
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// return number of bytes written
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return size;
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}
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STATIC mp_uint_t pyb_uart_ioctl(mp_obj_t self_in, mp_uint_t request, mp_uint_t arg, int *errcode) {
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*errcode = MP_EINVAL;
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return MP_STREAM_ERROR;
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}
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STATIC const mp_stream_p_t uart_stream_p = {
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.read = pyb_uart_read,
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.write = pyb_uart_write,
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.ioctl = pyb_uart_ioctl,
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.is_text = false,
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};
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const mp_obj_type_t pyb_uart_type = {
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{ &mp_type_type },
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.name = MP_QSTR_UART,
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.print = pyb_uart_print,
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.make_new = pyb_uart_make_new,
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.getiter = mp_identity,
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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*)&pyb_uart_locals_dict,
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};
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