275 lines
7.7 KiB
C
275 lines
7.7 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 "usart.h"
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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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UART_HandleTypeDef handle;
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};
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pyb_usart_obj_t *pyb_usart_global_debug = NULL;
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bool usart_init(pyb_usart_obj_t *usart_obj, 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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switch (usart_obj->usart_id) {
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// USART1 is on PA9/PA10, PB6/PB7
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case PYB_USART_1:
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USARTx = USART1;
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GPIO_AF_USARTx = GPIO_AF7_USART1;
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#if 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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#if !defined(PYBV10)
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// USART2 is on PA2/PA3, PD5/PD6
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case PYB_USART_2:
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USARTx = USART2;
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GPIO_AF_USARTx = GPIO_AF7_USART2;
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GPIO_Port = GPIOD;
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GPIO_Pin = GPIO_PIN_5 | GPIO_PIN_6;
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__USART2_CLK_ENABLE();
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break;
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#endif
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// USART3 is on PB10/PB11, PC10/PC11, PD8/PD9
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case PYB_USART_3:
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USARTx = USART3;
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GPIO_AF_USARTx = 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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// USART4 is on PA0/PA1, PC10/PC11
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case PYB_USART_4:
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USARTx = UART4;
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GPIO_AF_USARTx = 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
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case PYB_USART_6:
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USARTx = USART6;
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GPIO_AF_USARTx = 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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// Initialize USARTx
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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_USARTx;
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HAL_GPIO_Init(GPIO_Port, &GPIO_InitStructure);
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UART_HandleTypeDef *uh = &usart_obj->handle;
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memset(uh, 0, sizeof(*uh));
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uh->Instance = USARTx;
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uh->Init.BaudRate = baudrate;
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uh->Init.WordLength = USART_WORDLENGTH_8B;
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uh->Init.StopBits = USART_STOPBITS_1;
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uh->Init.Parity = USART_PARITY_NONE;
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uh->Init.Mode = USART_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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HAL_UART_Init(uh);
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return true;
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}
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bool usart_rx_any(pyb_usart_obj_t *usart_obj) {
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return __HAL_UART_GET_FLAG(&usart_obj->handle, USART_FLAG_RXNE);
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}
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int usart_rx_char(pyb_usart_obj_t *usart_obj) {
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uint8_t ch;
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if (HAL_UART_Receive(&usart_obj->handle, &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 usart_tx_char(pyb_usart_obj_t *usart_obj, int c) {
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uint8_t ch = c;
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HAL_UART_Transmit(&usart_obj->handle, &ch, 1, 100000);
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}
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void usart_tx_str(pyb_usart_obj_t *usart_obj, const char *str) {
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for (; *str; str++) {
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usart_tx_char(usart_obj, *str);
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}
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}
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void usart_tx_strn(pyb_usart_obj_t *usart_obj, const char *str, uint len) {
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for (; len > 0; str++, len--) {
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usart_tx_char(usart_obj, *str);
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}
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}
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void usart_tx_strn_cooked(pyb_usart_obj_t *usart_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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usart_tx_char(usart_obj, '\r');
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}
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usart_tx_char(usart_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 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_obj_t usart_obj_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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if (!(n_args == 2 && n_kw == 0)) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "USART accepts 2 arguments"));
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}
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// create object
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pyb_usart_obj_t *o = m_new_obj(pyb_usart_obj_t);
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o->base.type = &pyb_usart_type;
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// work out port
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o->usart_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->usart_id = PYB_USART_XA;
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} else if (strcmp(port, "XB") == 0) {
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o->usart_id = PYB_USART_XB;
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} else if (strcmp(port, "YA") == 0) {
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o->usart_id = PYB_USART_YA;
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} else if (strcmp(port, "YB") == 0) {
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o->usart_id = PYB_USART_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, "USART port %s does not exist", port));
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}
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} else {
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o->usart_id = mp_obj_get_int(args[0]);
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}
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// init USART (if it fails, it's because the port doesn't exist)
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if (!usart_init(o, mp_obj_get_int(args[1]))) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "USART port %d does not exist", o->usart_id));
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}
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o->is_enabled = true;
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return o;
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}
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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)) {
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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));
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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, 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_strn(self, 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 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_map_elem_t usart_locals_dict_table[] = {
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{ MP_OBJ_NEW_QSTR(MP_QSTR_status), (mp_obj_t)&usart_obj_status_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_recv_chr), (mp_obj_t)&usart_obj_rx_char_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_send_chr), (mp_obj_t)&usart_obj_tx_char_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_send), (mp_obj_t)&usart_obj_tx_str_obj },
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};
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STATIC MP_DEFINE_CONST_DICT(usart_locals_dict, usart_locals_dict_table);
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const mp_obj_type_t pyb_usart_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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.make_new = usart_obj_make_new,
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.locals_dict = (mp_obj_t)&usart_locals_dict,
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};
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