267 lines
7.8 KiB
C
267 lines
7.8 KiB
C
#include <stdio.h>
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#include <stm32f4xx_rcc.h>
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#include <stm32f4xx_gpio.h>
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#include <stm32f4xx_usart.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 "usart.h"
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pyb_usart_t pyb_usart_global_debug = PYB_USART_NONE;
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static USART_TypeDef *usart_get_base(pyb_usart_t usart_id) {
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USART_TypeDef *USARTx=NULL;
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switch (usart_id) {
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case PYB_USART_NONE:
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break;
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case PYB_USART_1:
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USARTx = USART1;
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break;
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case PYB_USART_2:
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USARTx = USART2;
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break;
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case PYB_USART_3:
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USARTx = USART3;
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break;
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case PYB_USART_6:
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USARTx = USART6;
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break;
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}
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return USARTx;
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}
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void usart_init(pyb_usart_t usart_id, uint32_t baudrate) {
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USART_TypeDef *USARTx=NULL;
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uint32_t GPIO_Pin=0;
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uint8_t GPIO_AF_USARTx=0;
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GPIO_TypeDef* GPIO_Port=NULL;
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uint16_t GPIO_PinSource_TX=0;
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uint16_t GPIO_PinSource_RX=0;
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uint32_t RCC_APBxPeriph=0;
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void (*RCC_APBxPeriphClockCmd)(uint32_t, FunctionalState)=NULL;
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switch (usart_id) {
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case PYB_USART_NONE:
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return;
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case PYB_USART_1:
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USARTx = USART1;
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GPIO_Port = GPIOA;
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GPIO_AF_USARTx = GPIO_AF_USART1;
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GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
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GPIO_PinSource_TX = GPIO_PinSource9;
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GPIO_PinSource_RX = GPIO_PinSource10;
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RCC_APBxPeriph = RCC_APB2Periph_USART1;
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RCC_APBxPeriphClockCmd =RCC_APB2PeriphClockCmd;
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break;
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case PYB_USART_2:
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USARTx = USART2;
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GPIO_Port = GPIOD;
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GPIO_AF_USARTx = GPIO_AF_USART2;
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GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6;
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GPIO_PinSource_TX = GPIO_PinSource5;
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GPIO_PinSource_RX = GPIO_PinSource6;
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RCC_APBxPeriph = RCC_APB1Periph_USART2;
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RCC_APBxPeriphClockCmd =RCC_APB1PeriphClockCmd;
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break;
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case PYB_USART_3:
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USARTx = USART3;
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#if defined(PYBOARD3) || defined(PYBOARD4)
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GPIO_Port = GPIOB;
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GPIO_AF_USARTx = GPIO_AF_USART3;
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GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
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GPIO_PinSource_TX = GPIO_PinSource10;
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GPIO_PinSource_RX = GPIO_PinSource11;
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#else
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GPIO_Port = GPIOD;
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GPIO_AF_USARTx = GPIO_AF_USART3;
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GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
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GPIO_PinSource_TX = GPIO_PinSource8;
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GPIO_PinSource_RX = GPIO_PinSource9;
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#endif
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RCC_APBxPeriph = RCC_APB1Periph_USART3;
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RCC_APBxPeriphClockCmd =RCC_APB1PeriphClockCmd;
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break;
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case PYB_USART_6:
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USARTx = USART6;
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GPIO_Port = GPIOC;
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GPIO_AF_USARTx = GPIO_AF_USART6;
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GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
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GPIO_PinSource_TX = GPIO_PinSource6;
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GPIO_PinSource_RX = GPIO_PinSource7;
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RCC_APBxPeriph = RCC_APB2Periph_USART6;
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RCC_APBxPeriphClockCmd =RCC_APB2PeriphClockCmd;
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break;
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}
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/* Initialize USARTx */
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RCC_APBxPeriphClockCmd(RCC_APBxPeriph, ENABLE);
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GPIO_PinAFConfig(GPIO_Port, GPIO_PinSource_TX, GPIO_AF_USARTx);
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GPIO_PinAFConfig(GPIO_Port, GPIO_PinSource_RX, GPIO_AF_USARTx);
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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GPIO_Init(GPIO_Port, &GPIO_InitStructure);
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USART_InitTypeDef USART_InitStructure;
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USART_InitStructure.USART_BaudRate = baudrate;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_No;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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USART_Init(USARTx, &USART_InitStructure);
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USART_Cmd(USARTx, ENABLE);
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}
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bool usart_rx_any(pyb_usart_t usart_id) {
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USART_TypeDef *USARTx = usart_get_base(usart_id);
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return USART_GetFlagStatus(USARTx, USART_FLAG_RXNE) == SET;
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}
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int usart_rx_char(pyb_usart_t usart_id) {
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USART_TypeDef *USARTx = usart_get_base(usart_id);
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return USART_ReceiveData(USARTx);
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}
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void usart_tx_char(pyb_usart_t usart_id, int c) {
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USART_TypeDef *USARTx = usart_get_base(usart_id);
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// wait until the end of any previous transmission
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uint32_t timeout = 100000;
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while (USART_GetFlagStatus(USARTx, USART_FLAG_TC) == RESET && --timeout > 0) {
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}
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USART_SendData(USARTx, c);
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}
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void usart_tx_str(pyb_usart_t usart_id, const char *str) {
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for (; *str; str++) {
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usart_tx_char(usart_id, *str);
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}
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}
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void usart_tx_bytes(pyb_usart_t usart_id, const char *data, uint len) {
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for (; len > 0; data++, len--) {
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usart_tx_char(usart_id, *data);
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}
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}
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void usart_tx_strn_cooked(pyb_usart_t usart_id, const char *str, int 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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usart_tx_char(usart_id, '\r');
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}
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usart_tx_char(usart_id, *str);
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}
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}
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/******************************************************************************/
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/* Micro Python bindings */
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typedef struct _pyb_usart_obj_t {
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mp_obj_base_t base;
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pyb_usart_t usart_id;
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bool is_enabled;
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} pyb_usart_obj_t;
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static mp_obj_t usart_obj_status(mp_obj_t self_in) {
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pyb_usart_obj_t *self = self_in;
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if (usart_rx_any(self->usart_id)) {
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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_obj_t usart_obj_rx_char(mp_obj_t self_in) {
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mp_obj_t ret = mp_const_none;
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pyb_usart_obj_t *self = self_in;
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if (self->is_enabled) {
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ret = mp_obj_new_int(usart_rx_char(self->usart_id));
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}
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return ret;
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}
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static mp_obj_t usart_obj_tx_char(mp_obj_t self_in, mp_obj_t c) {
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pyb_usart_obj_t *self = self_in;
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uint len;
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const char *str = mp_obj_str_get_data(c, &len);
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if (len == 1 && self->is_enabled) {
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usart_tx_char(self->usart_id, str[0]);
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}
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return mp_const_none;
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}
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static mp_obj_t usart_obj_tx_str(mp_obj_t self_in, mp_obj_t s) {
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pyb_usart_obj_t *self = self_in;
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if (self->is_enabled) {
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if (MP_OBJ_IS_STR(s)) {
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uint len;
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const char *data = mp_obj_str_get_data(s, &len);
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usart_tx_bytes(self->usart_id, data, len);
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}
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}
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return mp_const_none;
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}
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static void usart_obj_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_usart_obj_t *self = self_in;
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print(env, "<Usart %lu>", self->usart_id);
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}
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static MP_DEFINE_CONST_FUN_OBJ_1(usart_obj_status_obj, usart_obj_status);
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static MP_DEFINE_CONST_FUN_OBJ_1(usart_obj_rx_char_obj, usart_obj_rx_char);
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static MP_DEFINE_CONST_FUN_OBJ_2(usart_obj_tx_char_obj, usart_obj_tx_char);
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static MP_DEFINE_CONST_FUN_OBJ_2(usart_obj_tx_str_obj, usart_obj_tx_str);
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static const mp_method_t usart_methods[] = {
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{ "status", &usart_obj_status_obj },
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{ "recv_chr", &usart_obj_rx_char_obj },
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{ "send_chr", &usart_obj_tx_char_obj },
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{ "send", &usart_obj_tx_str_obj },
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{ NULL, NULL },
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};
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static const mp_obj_type_t usart_obj_type = {
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{ &mp_type_type },
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.name = MP_QSTR_Usart,
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.print = usart_obj_print,
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.methods = usart_methods,
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};
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mp_obj_t pyb_Usart(mp_obj_t usart_id, mp_obj_t baudrate) {
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if (mp_obj_get_int(usart_id)>PYB_USART_MAX) {
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return mp_const_none;
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}
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/* init USART */
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usart_init(mp_obj_get_int(usart_id), mp_obj_get_int(baudrate));
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pyb_usart_obj_t *o = m_new_obj(pyb_usart_obj_t);
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o->base.type = &usart_obj_type;
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o->usart_id = mp_obj_get_int(usart_id);
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o->is_enabled = true;
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return o;
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}
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