443 lines
14 KiB
C
443 lines
14 KiB
C
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/*
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* This file is part of the Micro Python 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) 2015 Glenn Ruben Bakke
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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 <stdbool.h>
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#include <string.h>
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#include <stdarg.h>
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#include "py/nlr.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/mphal.h"
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#include "uart.h"
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#include "mpconfigboard.h"
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#include "nrf.h"
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#include "mphalport.h"
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#include "hal_uart.h"
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#define CHAR_WIDTH_8BIT (0)
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#define CHAR_WIDTH_9BIT (1)
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struct _pyb_uart_obj_t {
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mp_obj_base_t base;
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UART_HandleTypeDef uart;
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IRQn_Type irqn;
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pyb_uart_t uart_id : 8;
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bool is_enabled : 1;
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byte char_width; // 0 for 7,8 bit chars, 1 for 9 bit chars
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uint16_t char_mask; // 0x7f for 7 bit, 0xff for 8 bit, 0x1ff for 9 bit
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uint16_t timeout; // timeout waiting for first char
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uint16_t timeout_char; // timeout waiting between chars
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uint16_t read_buf_len; // len in chars; buf can hold len-1 chars
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volatile uint16_t read_buf_head; // indexes first empty slot
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uint16_t read_buf_tail; // indexes first full slot (not full if equals head)
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byte *read_buf; // byte or uint16_t, depending on char size
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};
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STATIC mp_obj_t pyb_uart_deinit(mp_obj_t self_in);
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void uart_init0(void) {
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for (int i = 0; i < MP_ARRAY_SIZE(MP_STATE_PORT(pyb_uart_obj_all)); i++) {
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MP_STATE_PORT(pyb_uart_obj_all)[i] = NULL;
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}
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}
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// unregister all interrupt sources
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void uart_deinit(void) {
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for (int i = 0; i < MP_ARRAY_SIZE(MP_STATE_PORT(pyb_uart_obj_all)); i++) {
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pyb_uart_obj_t *uart_obj = MP_STATE_PORT(pyb_uart_obj_all)[i];
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if (uart_obj != NULL) {
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pyb_uart_deinit(uart_obj);
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}
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}
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}
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/// \method deinit()
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/// Turn off the UART bus.
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STATIC mp_obj_t pyb_uart_deinit(mp_obj_t self_in) {
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_uart_deinit_obj, pyb_uart_deinit);
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//// assumes Init parameters have been set up correctly
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STATIC bool uart_init2(pyb_uart_obj_t * uart_obj) {
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uart_obj->is_enabled = true;
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return true;
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}
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void uart_irq_handler(mp_uint_t uart_id) {
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}
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bool uart_rx_any(pyb_uart_obj_t *uart_obj) {
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// TODO: uart will block for now.
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return true;
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}
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// Waits at most timeout milliseconds for at least 1 char to become ready for
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// reading (from buf or for direct reading).
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// Returns true if something available, false if not.
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STATIC bool uart_rx_wait(pyb_uart_obj_t *self, uint32_t timeout) {
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return false;
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}
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int uart_rx_char(pyb_uart_obj_t *self) {
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return (int)nrf_uart_char_read();
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}
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STATIC void uart_tx_char(pyb_uart_obj_t * self, int c) {
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nrf_uart_char_write((char)c);
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}
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void uart_tx_strn(pyb_uart_obj_t *uart_obj, const char *str, uint len) {
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for (const char *top = str + len; str < top; str++) {
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uart_tx_char(uart_obj, *str);
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}
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}
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void uart_tx_strn_cooked(pyb_uart_obj_t *uart_obj, const char *str, uint len) {
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for (const char *top = str + len; str < top; str++) {
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if (*str == '\n') {
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uart_tx_char(uart_obj, '\r');
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}
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uart_tx_char(uart_obj, *str);
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}
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}
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/******************************************************************************/
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/* Micro Python bindings */
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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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}
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/// \method init(baudrate, bits=8, parity=None, stop=1, *, timeout=1000, timeout_char=0, read_buf_len=64)
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///
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/// Initialise the UART bus with the given parameters:
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///
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/// - `baudrate` is the clock rate.
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/// - `bits` is the number of bits per byte, 7, 8 or 9.
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/// - `parity` is the parity, `None`, 0 (even) or 1 (odd).
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/// - `stop` is the number of stop bits, 1 or 2.
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/// - `timeout` is the timeout in milliseconds to wait for the first character.
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/// - `timeout_char` is the timeout in milliseconds to wait between characters.
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/// - `read_buf_len` is the character length of the read buffer (0 to disable).
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STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_baudrate, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 9600} },
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{ MP_QSTR_bits, MP_ARG_INT, {.u_int = 8} },
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{ MP_QSTR_parity, MP_ARG_OBJ, {.u_obj = mp_const_none} },
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{ MP_QSTR_stop, MP_ARG_INT, {.u_int = 1} },
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{ MP_QSTR_flow, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = UART_HWCONTROL_NONE} },
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{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1000} },
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{ MP_QSTR_timeout_char, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_read_buf_len, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 64} },
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};
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// parse args
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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 the UART configuration values
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memset(&self->uart, 0, sizeof(self->uart));
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UART_InitTypeDef *init = &self->uart.init;
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// baudrate
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init->baud_rate = args[0].u_int;
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// flow control
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init->flow_control = args[4].u_int;
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// init UART (if it fails, it's because the port doesn't exist)
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if (!uart_init2(self)) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "UART(%d) does not exist", self->uart_id));
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}
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// set timeouts
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self->timeout = args[5].u_int;
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self->timeout_char = args[6].u_int;
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// setup the read buffer
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m_del(byte, self->read_buf, self->read_buf_len << self->char_width);
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self->read_buf_head = 0;
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self->read_buf_tail = 0;
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if (args[7].u_int <= 0) {
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// no read buffer
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self->read_buf_len = 0;
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self->read_buf = NULL;
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} else {
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// read buffer using interrupts
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self->read_buf_len = args[7].u_int;
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self->read_buf = m_new(byte, args[7].u_int << self->char_width);
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}
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hal_uart_init_t uart_init = {
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.rx_pin = MICROPY_HW_UART1_RX,
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.tx_pin = MICROPY_HW_UART1_TX,
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.rts_pin = MICROPY_HW_UART1_RTS,
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.cts_pin = MICROPY_HW_UART1_CTS,
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#if MICROPY_HW_UART1_HWFC
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.flow_control = true,
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#else
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.flow_control = false,
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#endif
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.use_parity = false,
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.baud_rate = HAL_UART_BAUD_115K2,
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#if (BLUETOOTH_SD == 100)
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.irq_priority = 3
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#else
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.irq_priority = 6
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#endif
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};
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nrf_uart_init(&uart_init);
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return mp_const_none;
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}
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/// \classmethod \constructor(bus, ...)
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///
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/// Construct a UART object.
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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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// check arguments
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mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
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// work out port
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int uart_id = 0;
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if (MP_OBJ_IS_STR(args[0])) {
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const char *port = mp_obj_str_get_str(args[0]);
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if (0) {
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} else if (strcmp(port, "COM1") == 0) {
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uart_id = PYB_UART_1;
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} else {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "UART(%s) does not exist", port));
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}
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} else {
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uart_id = mp_obj_get_int(args[0]);
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if (uart_id < 1 || uart_id > MP_ARRAY_SIZE(MP_STATE_PORT(pyb_uart_obj_all))) {
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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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}
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pyb_uart_obj_t *self;
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if (MP_STATE_PORT(pyb_uart_obj_all)[uart_id - 1] == NULL) {
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// create new UART object
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self = m_new0(pyb_uart_obj_t, 1);
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self->base.type = &pyb_uart_type;
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self->uart_id = uart_id;
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MP_STATE_PORT(pyb_uart_obj_all)[uart_id - 1] = self;
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} else {
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// reference existing UART object
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self = MP_STATE_PORT(pyb_uart_obj_all)[uart_id - 1];
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}
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if (n_args > 1 || n_kw > 0) {
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// start 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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}
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return self;
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}
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/// \method any()
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/// Return `True` if any characters waiting, else `False`.
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STATIC mp_obj_t pyb_uart_any(mp_obj_t self_in) {
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pyb_uart_obj_t *self = self_in;
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if (uart_rx_any(self)) {
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return mp_const_true;
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} else {
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return mp_const_false;
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}
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_uart_any_obj, pyb_uart_any);
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/// \method writechar(char)
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/// Write a single character on the bus. `char` is an integer to write.
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/// Return value: `None`.
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STATIC mp_obj_t pyb_uart_writechar(mp_obj_t self_in, mp_obj_t char_in) {
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pyb_uart_obj_t *self = self_in;
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// get the character to write (might be 9 bits)
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uint16_t data = mp_obj_get_int(char_in);
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for (int i = 0; i < 2; i++) {
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uart_tx_char(self, (int)(&data)[i]);
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}
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self->uart.instance->TASKS_STOPTX = 0;
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HAL_StatusTypeDef status = self->uart.instance->EVENTS_ERROR;
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if (status != HAL_OK) {
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mp_hal_raise(status);
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}
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(pyb_uart_writechar_obj, pyb_uart_writechar);
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/// \method readchar()
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/// Receive a single character on the bus.
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/// Return value: The character read, as an integer. Returns -1 on timeout.
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STATIC mp_obj_t pyb_uart_readchar(mp_obj_t self_in) {
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pyb_uart_obj_t *self = self_in;
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if (uart_rx_wait(self, self->timeout)) {
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return MP_OBJ_NEW_SMALL_INT(uart_rx_char(self));
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} else {
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// return -1 on timeout
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return MP_OBJ_NEW_SMALL_INT(-1);
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}
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_uart_readchar_obj, pyb_uart_readchar);
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// uart.sendbreak()
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STATIC mp_obj_t pyb_uart_sendbreak(mp_obj_t self_in) {
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_uart_sendbreak_obj, pyb_uart_sendbreak);
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STATIC const mp_map_elem_t pyb_uart_locals_dict_table[] = {
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// instance methods
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//{ MP_OBJ_NEW_QSTR(MP_QSTR_init), (mp_obj_t)&pyb_uart_init_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_deinit), (mp_obj_t)&pyb_uart_deinit_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_any), (mp_obj_t)&pyb_uart_any_obj },
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/// \method read([nbytes])
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{ MP_OBJ_NEW_QSTR(MP_QSTR_read), (mp_obj_t)&mp_stream_read_obj },
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/// \method readall()
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{ MP_OBJ_NEW_QSTR(MP_QSTR_readall), (mp_obj_t)&mp_stream_readall_obj },
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/// \method readline()
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{ MP_OBJ_NEW_QSTR(MP_QSTR_readline), (mp_obj_t)&mp_stream_unbuffered_readline_obj},
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/// \method readinto(buf[, nbytes])
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{ MP_OBJ_NEW_QSTR(MP_QSTR_readinto), (mp_obj_t)&mp_stream_readinto_obj },
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/// \method writechar(buf)
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{ MP_OBJ_NEW_QSTR(MP_QSTR_writechar), (mp_obj_t)&pyb_uart_writechar_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_readchar), (mp_obj_t)&pyb_uart_readchar_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_sendbreak), (mp_obj_t)&pyb_uart_sendbreak_obj },
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// class constants
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/*
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{ MP_OBJ_NEW_QSTR(MP_QSTR_RTS), MP_OBJ_NEW_SMALL_INT(UART_HWCONTROL_RTS) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_CTS), MP_OBJ_NEW_SMALL_INT(UART_HWCONTROL_CTS) },
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*/
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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 = self_in;
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byte *buf = buf_in;
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// check that size is a multiple of character width
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if (size & self->char_width) {
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*errcode = MP_EIO;
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return MP_STREAM_ERROR;
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}
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// convert byte size to char size
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size >>= self->char_width;
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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;
|
||
|
}
|
||
|
|
||
|
// read the data
|
||
|
byte * orig_buf = buf;
|
||
|
for (;;) {
|
||
|
int data = uart_rx_char(self);
|
||
|
|
||
|
*buf++ = data;
|
||
|
|
||
|
if (--size == 0) {
|
||
|
// return number of bytes read
|
||
|
return buf - orig_buf;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
STATIC mp_uint_t pyb_uart_write(mp_obj_t self_in, const void *buf_in, mp_uint_t size, int *errcode) {
|
||
|
pyb_uart_obj_t *self = self_in;
|
||
|
const byte *buf = buf_in;
|
||
|
|
||
|
// check that size is a multiple of character width
|
||
|
if (size & self->char_width) {
|
||
|
*errcode = MP_EIO;
|
||
|
return MP_STREAM_ERROR;
|
||
|
}
|
||
|
|
||
|
for (int i = 0; i < size; i++) {
|
||
|
uart_tx_char(self, (int)((uint8_t *)buf)[i]);
|
||
|
}
|
||
|
|
||
|
HAL_StatusTypeDef status = self->uart.instance->EVENTS_ERROR;
|
||
|
|
||
|
if (status == HAL_OK) {
|
||
|
// return number of bytes written
|
||
|
return size;
|
||
|
} else {
|
||
|
*errcode = mp_hal_status_to_errno_table[status];
|
||
|
return MP_STREAM_ERROR;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
STATIC mp_uint_t pyb_uart_ioctl(mp_obj_t self_in, mp_uint_t request, uintptr_t arg, int *errcode) {
|
||
|
pyb_uart_obj_t *self = self_in;
|
||
|
(void)self;
|
||
|
return MP_STREAM_ERROR;
|
||
|
}
|
||
|
|
||
|
STATIC const mp_stream_p_t uart_stream_p = {
|
||
|
.read = pyb_uart_read,
|
||
|
.write = pyb_uart_write,
|
||
|
.ioctl = pyb_uart_ioctl,
|
||
|
.is_text = false,
|
||
|
};
|
||
|
|
||
|
const mp_obj_type_t pyb_uart_type = {
|
||
|
{ &mp_type_type },
|
||
|
.name = MP_QSTR_UART,
|
||
|
.print = pyb_uart_print,
|
||
|
.make_new = pyb_uart_make_new,
|
||
|
.getiter = mp_identity,
|
||
|
.iternext = mp_stream_unbuffered_iter,
|
||
|
.protocol = &uart_stream_p,
|
||
|
.locals_dict = (mp_obj_t)&pyb_uart_locals_dict,
|
||
|
};
|
||
|
|