416 lines
13 KiB
C
416 lines
13 KiB
C
#include <stdio.h>
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#include <string.h>
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#include "stm32f4xx_hal.h"
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#include "nlr.h"
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#include "misc.h"
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#include "mpconfig.h"
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#include "qstr.h"
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#include "obj.h"
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#include "runtime.h"
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#include "bufhelper.h"
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#include "uart.h"
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// Usage model:
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//
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// See usage model of I2C in i2c.c. UART is very similar. Main difference is
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// parameters to init the UART bus:
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//
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// from pyb import UART
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// uart = UART(1, 9600) # init with given baudrate
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// uart.init(9600, bits=8, stop=1, parity=None) # init with given parameters
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//
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// Bits can be 8 or 9, stop can be 1 or 2, parity can be None, 0 (even), 1 (odd).
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//
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// Extra method:
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//
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// uart.any() # returns True if any characters waiting
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struct _pyb_uart_obj_t {
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mp_obj_base_t base;
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pyb_uart_t uart_id;
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bool is_enabled;
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UART_HandleTypeDef uart;
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};
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pyb_uart_obj_t *pyb_uart_global_debug = NULL;
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// assumes Init parameters have been set up correctly
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bool uart_init2(pyb_uart_obj_t *uart_obj) {
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USART_TypeDef *UARTx = NULL;
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uint32_t GPIO_Pin = 0;
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uint8_t GPIO_AF_UARTx = 0;
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GPIO_TypeDef* GPIO_Port = NULL;
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switch (uart_obj->uart_id) {
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// USART1 is on PA9/PA10 (CK on PA8), PB6/PB7
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case PYB_UART_1:
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UARTx = USART1;
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GPIO_AF_UARTx = GPIO_AF7_USART1;
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#if defined (PYBV4) || defined(PYBV10)
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GPIO_Port = GPIOB;
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GPIO_Pin = GPIO_PIN_6 | GPIO_PIN_7;
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#else
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GPIO_Port = GPIOA;
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GPIO_Pin = GPIO_PIN_9 | GPIO_PIN_10;
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#endif
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__USART1_CLK_ENABLE();
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break;
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// USART2 is on PA2/PA3 (CK on PA4), PD5/PD6 (CK on PD7)
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case PYB_UART_2:
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UARTx = USART2;
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GPIO_AF_UARTx = GPIO_AF7_USART2;
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GPIO_Port = GPIOA;
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GPIO_Pin = GPIO_PIN_2 | GPIO_PIN_3;
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__USART2_CLK_ENABLE();
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break;
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// USART3 is on PB10/PB11 (CK on PB12), PC10/PC11 (CK on PC12), PD8/PD9 (CK on PD10)
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case PYB_UART_3:
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UARTx = USART3;
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GPIO_AF_UARTx = GPIO_AF7_USART3;
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#if defined(PYBV3) || defined(PYBV4) | defined(PYBV10)
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GPIO_Port = GPIOB;
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GPIO_Pin = GPIO_PIN_10 | GPIO_PIN_11;
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#else
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GPIO_Port = GPIOD;
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GPIO_Pin = GPIO_PIN_8 | GPIO_PIN_9;
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#endif
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__USART3_CLK_ENABLE();
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break;
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// UART4 is on PA0/PA1, PC10/PC11
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case PYB_UART_4:
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UARTx = UART4;
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GPIO_AF_UARTx = GPIO_AF8_UART4;
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GPIO_Port = GPIOA;
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GPIO_Pin = GPIO_PIN_0 | GPIO_PIN_1;
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__UART4_CLK_ENABLE();
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break;
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// USART6 is on PC6/PC7 (CK on PC8)
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case PYB_UART_6:
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UARTx = USART6;
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GPIO_AF_UARTx = GPIO_AF8_USART6;
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GPIO_Port = GPIOC;
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GPIO_Pin = GPIO_PIN_6 | GPIO_PIN_7;
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__USART6_CLK_ENABLE();
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break;
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default:
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return false;
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}
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// init GPIO
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.Pin = GPIO_Pin;
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GPIO_InitStructure.Speed = GPIO_SPEED_HIGH;
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GPIO_InitStructure.Mode = GPIO_MODE_AF_PP;
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GPIO_InitStructure.Pull = GPIO_PULLUP;
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GPIO_InitStructure.Alternate = GPIO_AF_UARTx;
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HAL_GPIO_Init(GPIO_Port, &GPIO_InitStructure);
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// init UARTx
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uart_obj->uart.Instance = UARTx;
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HAL_UART_Init(&uart_obj->uart);
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uart_obj->is_enabled = true;
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return true;
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}
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bool uart_init(pyb_uart_obj_t *uart_obj, uint32_t baudrate) {
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UART_HandleTypeDef *uh = &uart_obj->uart;
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memset(uh, 0, sizeof(*uh));
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uh->Init.BaudRate = baudrate;
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uh->Init.WordLength = UART_WORDLENGTH_8B;
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uh->Init.StopBits = UART_STOPBITS_1;
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uh->Init.Parity = UART_PARITY_NONE;
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uh->Init.Mode = UART_MODE_TX_RX;
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uh->Init.HwFlowCtl = UART_HWCONTROL_NONE;
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uh->Init.OverSampling = UART_OVERSAMPLING_16;
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return uart_init2(uart_obj);
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}
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void uart_deinit(pyb_uart_obj_t *uart_obj) {
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uart_obj->is_enabled = false;
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UART_HandleTypeDef *uart = &uart_obj->uart;
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HAL_UART_DeInit(uart);
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if (uart->Instance == USART1) {
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__USART1_FORCE_RESET();
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__USART1_RELEASE_RESET();
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__USART1_CLK_DISABLE();
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} else if (uart->Instance == USART2) {
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__USART2_FORCE_RESET();
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__USART2_RELEASE_RESET();
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__USART2_CLK_DISABLE();
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} else if (uart->Instance == USART3) {
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__USART3_FORCE_RESET();
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__USART3_RELEASE_RESET();
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__USART3_CLK_DISABLE();
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} else if (uart->Instance == UART4) {
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__UART4_FORCE_RESET();
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__UART4_RELEASE_RESET();
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__UART4_CLK_DISABLE();
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} else if (uart->Instance == USART6) {
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__USART6_FORCE_RESET();
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__USART6_RELEASE_RESET();
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__USART6_CLK_DISABLE();
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}
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}
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bool uart_rx_any(pyb_uart_obj_t *uart_obj) {
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return __HAL_UART_GET_FLAG(&uart_obj->uart, UART_FLAG_RXNE);
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}
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int uart_rx_char(pyb_uart_obj_t *uart_obj) {
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uint8_t ch;
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if (HAL_UART_Receive(&uart_obj->uart, &ch, 1, 0) != HAL_OK) {
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ch = 0;
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}
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return ch;
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}
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void uart_tx_char(pyb_uart_obj_t *uart_obj, int c) {
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uint8_t ch = c;
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HAL_UART_Transmit(&uart_obj->uart, &ch, 1, 100000);
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}
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void uart_tx_str(pyb_uart_obj_t *uart_obj, const char *str) {
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HAL_UART_Transmit(&uart_obj->uart, (uint8_t*)str, strlen(str), 100000);
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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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HAL_UART_Transmit(&uart_obj->uart, (uint8_t*)str, len, 100000);
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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(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
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pyb_uart_obj_t *self = self_in;
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if (!self->is_enabled) {
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print(env, "UART(%lu)", self->uart_id);
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} else {
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print(env, "UART(%lu, baudrate=%u, bits=%u, stop=%u",
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self->uart_id, self->uart.Init.BaudRate,
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self->uart.Init.WordLength == UART_WORDLENGTH_8B ? 8 : 9,
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self->uart.Init.StopBits == UART_STOPBITS_1 ? 1 : 2);
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if (self->uart.Init.Parity == UART_PARITY_NONE) {
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print(env, ", parity=None)");
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} else {
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print(env, ", parity=%u)", self->uart.Init.Parity == UART_PARITY_EVEN ? 0 : 1);
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}
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}
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}
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STATIC const mp_arg_t pyb_uart_init_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_KW_ONLY | MP_ARG_INT, {.u_int = 8} },
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{ MP_QSTR_stop, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1} },
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{ MP_QSTR_parity, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
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};
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#define PYB_UART_INIT_NUM_ARGS ARRAY_SIZE(pyb_uart_init_args)
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STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
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// parse args
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mp_arg_val_t vals[PYB_UART_INIT_NUM_ARGS];
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mp_arg_parse_all(n_args, args, kw_args, PYB_UART_INIT_NUM_ARGS, pyb_uart_init_args, vals);
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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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init->BaudRate = vals[0].u_int;
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init->WordLength = vals[1].u_int == 8 ? UART_WORDLENGTH_8B : UART_WORDLENGTH_9B;
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switch (vals[2].u_int) {
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case 1: init->StopBits = UART_STOPBITS_1; break;
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default: init->StopBits = UART_STOPBITS_2; break;
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}
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if (vals[3].u_obj == mp_const_none) {
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init->Parity = UART_PARITY_NONE;
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} else {
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machine_int_t parity = mp_obj_get_int(vals[3].u_obj);
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init->Parity = (parity & 1) ? UART_PARITY_ODD : UART_PARITY_EVEN;
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}
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init->Mode = UART_MODE_TX_RX;
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init->HwFlowCtl = UART_HWCONTROL_NONE;
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init->OverSampling = UART_OVERSAMPLING_16;
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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 port %d does not exist", self->uart_id));
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}
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return mp_const_none;
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}
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STATIC mp_obj_t pyb_uart_make_new(mp_obj_t type_in, uint n_args, uint 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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// create object
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pyb_uart_obj_t *o = m_new_obj(pyb_uart_obj_t);
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o->base.type = &pyb_uart_type;
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// work out port
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o->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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#if defined(PYBV10)
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} else if (strcmp(port, "XA") == 0) {
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o->uart_id = PYB_UART_XA;
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} else if (strcmp(port, "XB") == 0) {
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o->uart_id = PYB_UART_XB;
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} else if (strcmp(port, "YA") == 0) {
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o->uart_id = PYB_UART_YA;
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} else if (strcmp(port, "YB") == 0) {
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o->uart_id = PYB_UART_YB;
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#endif
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} else {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "UART port %s does not exist", port));
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}
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} else {
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o->uart_id = mp_obj_get_int(args[0]);
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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(o, n_args - 1, args + 1, &kw_args);
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}
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return o;
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}
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STATIC mp_obj_t pyb_uart_init(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
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return pyb_uart_init_helper(args[0], n_args - 1, args + 1, kw_args);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_uart_init_obj, 1, pyb_uart_init);
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STATIC mp_obj_t pyb_uart_deinit(mp_obj_t self_in) {
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pyb_uart_obj_t *self = self_in;
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uart_deinit(self);
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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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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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STATIC const mp_arg_t pyb_uart_send_args[] = {
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{ MP_QSTR_send, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
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};
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#define PYB_UART_SEND_NUM_ARGS ARRAY_SIZE(pyb_uart_send_args)
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STATIC mp_obj_t pyb_uart_send(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
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// TODO assumes transmission size is 8-bits wide
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pyb_uart_obj_t *self = args[0];
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// parse args
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mp_arg_val_t vals[PYB_UART_SEND_NUM_ARGS];
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mp_arg_parse_all(n_args - 1, args + 1, kw_args, PYB_UART_SEND_NUM_ARGS, pyb_uart_send_args, vals);
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// get the buffer to send from
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mp_buffer_info_t bufinfo;
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uint8_t data[1];
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pyb_buf_get_for_send(vals[0].u_obj, &bufinfo, data);
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// send the data
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HAL_StatusTypeDef status = HAL_UART_Transmit(&self->uart, bufinfo.buf, bufinfo.len, vals[1].u_int);
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if (status != HAL_OK) {
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// TODO really need a HardwareError object, or something
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_Exception, "HAL_UART_Transmit failed with code %d", 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_KW(pyb_uart_send_obj, 1, pyb_uart_send);
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STATIC const mp_arg_t pyb_uart_recv_args[] = {
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{ MP_QSTR_recv, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
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};
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#define PYB_UART_RECV_NUM_ARGS ARRAY_SIZE(pyb_uart_recv_args)
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STATIC mp_obj_t pyb_uart_recv(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
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// TODO assumes transmission size is 8-bits wide
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pyb_uart_obj_t *self = args[0];
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// parse args
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mp_arg_val_t vals[PYB_UART_RECV_NUM_ARGS];
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mp_arg_parse_all(n_args - 1, args + 1, kw_args, PYB_UART_RECV_NUM_ARGS, pyb_uart_recv_args, vals);
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// get the buffer to receive into
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mp_buffer_info_t bufinfo;
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mp_obj_t o_ret = pyb_buf_get_for_recv(vals[0].u_obj, &bufinfo);
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// receive the data
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HAL_StatusTypeDef status = HAL_UART_Receive(&self->uart, bufinfo.buf, bufinfo.len, vals[1].u_int);
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if (status != HAL_OK) {
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// TODO really need a HardwareError object, or something
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_Exception, "HAL_UART_Receive failed with code %d", status));
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}
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// return the received data
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if (o_ret == MP_OBJ_NULL) {
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return vals[0].u_obj;
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} else {
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return mp_obj_str_builder_end(o_ret);
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}
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_uart_recv_obj, 1, pyb_uart_recv);
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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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{ MP_OBJ_NEW_QSTR(MP_QSTR_send), (mp_obj_t)&pyb_uart_send_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_recv), (mp_obj_t)&pyb_uart_recv_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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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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.locals_dict = (mp_obj_t)&pyb_uart_locals_dict,
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};
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