468 lines
16 KiB
C
468 lines
16 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 "driver/uart.h"
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#include "freertos/FreeRTOS.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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typedef struct _machine_uart_obj_t {
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mp_obj_base_t base;
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uart_port_t uart_num;
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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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int8_t tx;
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int8_t rx;
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int8_t rts;
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int8_t cts;
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uint16_t txbuf;
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uint16_t rxbuf;
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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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uint32_t invert; // lines to invert
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} machine_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 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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uint32_t baudrate;
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uart_get_baudrate(self->uart_num, &baudrate);
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mp_printf(print, "UART(%u, baudrate=%u, bits=%u, parity=%s, stop=%u, tx=%d, rx=%d, rts=%d, cts=%d, txbuf=%u, rxbuf=%u, timeout=%u, timeout_char=%u",
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self->uart_num, baudrate, self->bits, _parity_name[self->parity],
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self->stop, self->tx, self->rx, self->rts, self->cts, self->txbuf, self->rxbuf, self->timeout, self->timeout_char);
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if (self->invert) {
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mp_printf(print, ", invert=");
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uint32_t invert_mask = self->invert;
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if (invert_mask & UART_INVERSE_TXD) {
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mp_printf(print, "INV_TX");
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invert_mask &= ~UART_INVERSE_TXD;
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if (invert_mask) {
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mp_printf(print, "|");
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}
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}
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if (invert_mask & UART_INVERSE_RXD) {
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mp_printf(print, "INV_RX");
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invert_mask &= ~UART_INVERSE_RXD;
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if (invert_mask) {
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mp_printf(print, "|");
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}
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}
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if (invert_mask & UART_INVERSE_RTS) {
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mp_printf(print, "INV_RTS");
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invert_mask &= ~UART_INVERSE_RTS;
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if (invert_mask) {
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mp_printf(print, "|");
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}
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}
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if (invert_mask & UART_INVERSE_CTS) {
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mp_printf(print, "INV_CTS");
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}
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}
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mp_printf(print, ")");
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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_baudrate, ARG_bits, ARG_parity, ARG_stop, ARG_tx, ARG_rx, ARG_rts, ARG_cts, ARG_txbuf, ARG_rxbuf, ARG_timeout, ARG_timeout_char, ARG_invert };
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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_INT, {.u_int = UART_PIN_NO_CHANGE} },
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{ MP_QSTR_rx, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = UART_PIN_NO_CHANGE} },
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{ MP_QSTR_rts, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = UART_PIN_NO_CHANGE} },
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{ MP_QSTR_cts, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = UART_PIN_NO_CHANGE} },
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{ MP_QSTR_txbuf, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
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{ MP_QSTR_rxbuf, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
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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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{ MP_QSTR_invert, 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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// wait for all data to be transmitted before changing settings
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uart_wait_tx_done(self->uart_num, pdMS_TO_TICKS(1000));
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if (args[ARG_txbuf].u_int >= 0 || args[ARG_rxbuf].u_int >= 0) {
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// must reinitialise driver to change the tx/rx buffer size
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if (args[ARG_txbuf].u_int >= 0) {
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self->txbuf = args[ARG_txbuf].u_int;
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}
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if (args[ARG_rxbuf].u_int >= 0) {
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self->rxbuf = args[ARG_rxbuf].u_int;
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}
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uart_config_t uartcfg = {
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.flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
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.rx_flow_ctrl_thresh = 0
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};
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uint32_t baudrate;
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uart_get_baudrate(self->uart_num, &baudrate);
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uartcfg.baud_rate = baudrate;
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uart_get_word_length(self->uart_num, &uartcfg.data_bits);
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uart_get_parity(self->uart_num, &uartcfg.parity);
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uart_get_stop_bits(self->uart_num, &uartcfg.stop_bits);
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uart_driver_delete(self->uart_num);
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uart_param_config(self->uart_num, &uartcfg);
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uart_driver_install(self->uart_num, self->rxbuf, self->txbuf, 0, NULL, 0);
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}
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// set baudrate
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uint32_t baudrate = 115200;
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if (args[ARG_baudrate].u_int > 0) {
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uart_set_baudrate(self->uart_num, args[ARG_baudrate].u_int);
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uart_get_baudrate(self->uart_num, &baudrate);
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}
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uart_set_pin(self->uart_num, args[ARG_tx].u_int, args[ARG_rx].u_int, args[ARG_rts].u_int, args[ARG_cts].u_int);
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if (args[ARG_tx].u_int != UART_PIN_NO_CHANGE) {
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self->tx = args[ARG_tx].u_int;
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}
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if (args[ARG_rx].u_int != UART_PIN_NO_CHANGE) {
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self->rx = args[ARG_rx].u_int;
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}
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if (args[ARG_rts].u_int != UART_PIN_NO_CHANGE) {
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self->rts = args[ARG_rts].u_int;
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}
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if (args[ARG_cts].u_int != UART_PIN_NO_CHANGE) {
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self->cts = args[ARG_cts].u_int;
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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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uart_set_word_length(self->uart_num, UART_DATA_5_BITS);
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self->bits = 5;
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break;
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case 6:
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uart_set_word_length(self->uart_num, UART_DATA_6_BITS);
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self->bits = 6;
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break;
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case 7:
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uart_set_word_length(self->uart_num, UART_DATA_7_BITS);
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self->bits = 7;
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break;
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case 8:
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uart_set_word_length(self->uart_num, UART_DATA_8_BITS);
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self->bits = 8;
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break;
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default:
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mp_raise_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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uart_set_parity(self->uart_num, UART_PARITY_DISABLE);
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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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if (parity & 1) {
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uart_set_parity(self->uart_num, UART_PARITY_ODD);
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self->parity = 1;
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} else {
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uart_set_parity(self->uart_num, UART_PARITY_EVEN);
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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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// FIXME: ESP32 also supports 1.5 stop bits
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case 0:
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break;
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case 1:
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uart_set_stop_bits(self->uart_num, UART_STOP_BITS_1);
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self->stop = 1;
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break;
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case 2:
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uart_set_stop_bits(self->uart_num, UART_STOP_BITS_2);
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self->stop = 2;
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break;
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default:
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mp_raise_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 / 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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// set line inversion
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if (args[ARG_invert].u_int & ~UART_LINE_INV_MASK) {
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mp_raise_ValueError("invalid inversion mask");
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}
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self->invert = args[ARG_invert].u_int;
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uart_set_line_inverse(self->uart_num, self->invert);
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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 uart id
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mp_int_t uart_num = mp_obj_get_int(args[0]);
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if (uart_num < 0 || uart_num >= UART_NUM_MAX) {
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mp_raise_msg_varg(&mp_type_ValueError, "UART(%d) does not exist", uart_num);
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}
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// Attempts to use UART0 from Python has resulted in all sorts of fun errors.
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// FIXME: UART0 is disabled for now.
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if (uart_num == UART_NUM_0) {
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mp_raise_msg_varg(&mp_type_ValueError, "UART(%d) is disabled (dedicated to REPL)", uart_num);
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}
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// Defaults
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uart_config_t uartcfg = {
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.baud_rate = 115200,
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.data_bits = UART_DATA_8_BITS,
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.parity = UART_PARITY_DISABLE,
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.stop_bits = UART_STOP_BITS_1,
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.flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
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.rx_flow_ctrl_thresh = 0
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};
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// create instance
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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->uart_num = uart_num;
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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->rts = UART_PIN_NO_CHANGE;
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self->cts = UART_PIN_NO_CHANGE;
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self->txbuf = 256;
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self->rxbuf = 256; // IDF minimum
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self->timeout = 0;
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self->timeout_char = 0;
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switch (uart_num) {
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case UART_NUM_0:
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self->rx = UART_PIN_NO_CHANGE; // GPIO 3
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self->tx = UART_PIN_NO_CHANGE; // GPIO 1
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break;
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case UART_NUM_1:
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self->rx = 9;
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self->tx = 10;
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break;
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case UART_NUM_2:
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self->rx = 16;
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self->tx = 17;
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break;
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}
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// Remove any existing configuration
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uart_driver_delete(self->uart_num);
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// init the peripheral
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// Setup
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uart_param_config(self->uart_num, &uartcfg);
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uart_driver_install(uart_num, self->rxbuf, self->txbuf, 0, NULL, 0);
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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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// Make sure pins are connected.
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uart_set_pin(self->uart_num, self->tx, self->rx, self->rts, self->cts);
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return MP_OBJ_FROM_PTR(self);
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}
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STATIC mp_obj_t machine_uart_init(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
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machine_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(machine_uart_init_obj, 1, machine_uart_init);
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STATIC mp_obj_t machine_uart_deinit(mp_obj_t self_in) {
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machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
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uart_driver_delete(self->uart_num);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_uart_deinit_obj, machine_uart_deinit);
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STATIC mp_obj_t machine_uart_any(mp_obj_t self_in) {
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machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
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size_t rxbufsize;
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uart_get_buffered_data_len(self->uart_num, &rxbufsize);
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return MP_OBJ_NEW_SMALL_INT(rxbufsize);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_uart_any_obj, machine_uart_any);
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STATIC mp_obj_t machine_uart_sendbreak(mp_obj_t self_in) {
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machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
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// Save settings
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uart_word_length_t word_length;
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uart_parity_t parity;
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uart_get_word_length(self->uart_num, &word_length);
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uart_get_parity(self->uart_num, &parity);
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// Synthesise the break condition by either a longer word or using even parity
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uart_wait_tx_done(self->uart_num, pdMS_TO_TICKS(1000));
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if (word_length != UART_DATA_8_BITS) {
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uart_set_word_length(self->uart_num, UART_DATA_8_BITS);
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} else if (parity == UART_PARITY_DISABLE) {
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uart_set_parity(self->uart_num, UART_PARITY_EVEN);
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} else {
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// Cannot synthesise break
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mp_raise_OSError(MP_EPERM);
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}
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char buf[1] = {0};
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uart_write_bytes(self->uart_num, buf, 1);
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uart_wait_tx_done(self->uart_num, pdMS_TO_TICKS(1000));
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// Restore original settings
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uart_set_word_length(self->uart_num, word_length);
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uart_set_parity(self->uart_num, parity);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_uart_sendbreak_obj, machine_uart_sendbreak);
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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_init), MP_ROM_PTR(&machine_uart_init_obj) },
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{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&machine_uart_deinit_obj) },
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{ MP_ROM_QSTR(MP_QSTR_any), MP_ROM_PTR(&machine_uart_any_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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{ MP_ROM_QSTR(MP_QSTR_sendbreak), MP_ROM_PTR(&machine_uart_sendbreak_obj) },
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{ MP_ROM_QSTR(MP_QSTR_INV_TX), MP_ROM_INT(UART_INVERSE_TXD) },
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{ MP_ROM_QSTR(MP_QSTR_INV_RX), MP_ROM_INT(UART_INVERSE_RXD) },
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{ MP_ROM_QSTR(MP_QSTR_INV_RTS), MP_ROM_INT(UART_INVERSE_RTS) },
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{ MP_ROM_QSTR(MP_QSTR_INV_CTS), MP_ROM_INT(UART_INVERSE_CTS) },
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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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// 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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TickType_t time_to_wait;
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if (self->timeout == 0) {
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time_to_wait = 0;
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} else {
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time_to_wait = pdMS_TO_TICKS(self->timeout);
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}
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int bytes_read = uart_read_bytes(self->uart_num, buf_in, size, time_to_wait);
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if (bytes_read <= 0) {
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*errcode = MP_EAGAIN;
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return MP_STREAM_ERROR;
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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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int bytes_written = uart_write_bytes(self->uart_num, buf_in, size);
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if (bytes_written < 0) {
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*errcode = MP_EAGAIN;
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return MP_STREAM_ERROR;
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}
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// return number of bytes written
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return bytes_written;
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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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machine_uart_obj_t *self = self_in;
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mp_uint_t ret;
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if (request == MP_STREAM_POLL) {
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mp_uint_t flags = arg;
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ret = 0;
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size_t rxbufsize;
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uart_get_buffered_data_len(self->uart_num, &rxbufsize);
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if ((flags & MP_STREAM_POLL_RD) && rxbufsize > 0) {
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ret |= MP_STREAM_POLL_RD;
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}
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if ((flags & MP_STREAM_POLL_WR) && 1) { // FIXME: uart_tx_any_room(self->uart_num)
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ret |= MP_STREAM_POLL_WR;
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}
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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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