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#include <stdio.h>
#include <string.h>
#include "stm32f4xx_hal.h"
#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "usart.h"
struct _pyb_usart_obj_t {
mp_obj_base_t base;
pyb_usart_t usart_id;
bool is_enabled;
UART_HandleTypeDef handle;
};
pyb_usart_obj_t *pyb_usart_global_debug = NULL;
void usart_init(pyb_usart_obj_t *usart_obj, uint32_t baudrate) {
USART_TypeDef *USARTx=NULL;
uint32_t GPIO_Pin=0;
uint8_t GPIO_AF_USARTx=0;
GPIO_TypeDef* GPIO_Port=NULL;
switch (usart_obj->usart_id) {
case PYB_USART_NONE:
return;
case PYB_USART_1:
USARTx = USART1;
GPIO_Port = GPIOA;
GPIO_AF_USARTx = GPIO_AF7_USART1;
GPIO_Pin = GPIO_PIN_9 | GPIO_PIN_10;
__USART1_CLK_ENABLE();
break;
case PYB_USART_2:
USARTx = USART2;
GPIO_Port = GPIOD;
GPIO_AF_USARTx = GPIO_AF7_USART2;
GPIO_Pin = GPIO_PIN_5 | GPIO_PIN_6;
__USART2_CLK_ENABLE();
break;
case PYB_USART_3:
USARTx = USART3;
#if defined(PYBV3) || defined(PYBV4)
GPIO_Port = GPIOB;
GPIO_AF_USARTx = GPIO_AF7_USART3;
GPIO_Pin = GPIO_PIN_10 | GPIO_PIN_11;
#else
GPIO_Port = GPIOD;
GPIO_AF_USARTx = GPIO_AF7_USART3;
GPIO_Pin = GPIO_PIN_8 | GPIO_PIN_9;
#endif
__USART3_CLK_ENABLE();
break;
case PYB_USART_6:
USARTx = USART6;
GPIO_Port = GPIOC;
GPIO_AF_USARTx = GPIO_AF8_USART6;
GPIO_Pin = GPIO_PIN_6 | GPIO_PIN_7;
__USART6_CLK_ENABLE();
break;
}
// Initialize USARTx
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.Pin = GPIO_Pin;
GPIO_InitStructure.Speed = GPIO_SPEED_HIGH;
GPIO_InitStructure.Mode = GPIO_MODE_AF_PP;
GPIO_InitStructure.Pull = GPIO_PULLUP;
GPIO_InitStructure.Alternate = GPIO_AF_USARTx;
HAL_GPIO_Init(GPIO_Port, &GPIO_InitStructure);
UART_HandleTypeDef *uh = &usart_obj->handle;
memset(uh, 0, sizeof(*uh));
uh->Instance = USARTx;
uh->Init.BaudRate = baudrate;
uh->Init.WordLength = USART_WORDLENGTH_8B;
uh->Init.StopBits = USART_STOPBITS_1;
uh->Init.Parity = USART_PARITY_NONE;
uh->Init.Mode = USART_MODE_TX_RX;
uh->Init.HwFlowCtl = UART_HWCONTROL_NONE;
uh->Init.OverSampling = UART_OVERSAMPLING_16;
HAL_UART_Init(uh);
}
bool usart_rx_any(pyb_usart_obj_t *usart_obj) {
return __HAL_UART_GET_FLAG(&usart_obj->handle, USART_FLAG_RXNE);
}
int usart_rx_char(pyb_usart_obj_t *usart_obj) {
uint8_t ch;
if (HAL_UART_Receive(&usart_obj->handle, &ch, 1, 0) != HAL_OK) {
ch = 0;
}
return ch;
}
void usart_tx_char(pyb_usart_obj_t *usart_obj, int c) {
uint8_t ch = c;
HAL_UART_Transmit(&usart_obj->handle, &ch, 1, 100000);
}
void usart_tx_str(pyb_usart_obj_t *usart_obj, const char *str) {
for (; *str; str++) {
usart_tx_char(usart_obj, *str);
}
}
void usart_tx_strn(pyb_usart_obj_t *usart_obj, const char *str, uint len) {
for (; len > 0; str++, len--) {
usart_tx_char(usart_obj, *str);
}
}
void usart_tx_strn_cooked(pyb_usart_obj_t *usart_obj, const char *str, uint len) {
for (const char *top = str + len; str < top; str++) {
if (*str == '\n') {
usart_tx_char(usart_obj, '\r');
}
usart_tx_char(usart_obj, *str);
}
}
/******************************************************************************/
/* Micro Python bindings */
STATIC void usart_obj_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
pyb_usart_obj_t *self = self_in;
print(env, "<Usart %lu>", self->usart_id);
}
STATIC mp_obj_t usart_obj_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
// check arguments
if (!(n_args == 2 && n_kw == 0)) {
nlr_jump(mp_obj_new_exception_msg(&mp_type_ValueError, "Usart accepts 2 arguments"));
}
if (mp_obj_get_int(args[0]) > PYB_USART_MAX) {
return mp_const_none;
}
pyb_usart_obj_t *o = m_new_obj(pyb_usart_obj_t);
o->base.type = &pyb_usart_type;
o->usart_id = mp_obj_get_int(args[0]);
o->is_enabled = true;
/* init USART */
usart_init(o, mp_obj_get_int(args[1]));
return o;
}
STATIC mp_obj_t usart_obj_status(mp_obj_t self_in) {
pyb_usart_obj_t *self = self_in;
if (usart_rx_any(self)) {
return mp_const_true;
} else {
return mp_const_false;
}
}
STATIC mp_obj_t usart_obj_rx_char(mp_obj_t self_in) {
mp_obj_t ret = mp_const_none;
pyb_usart_obj_t *self = self_in;
if (self->is_enabled) {
ret = mp_obj_new_int(usart_rx_char(self));
}
return ret;
}
STATIC mp_obj_t usart_obj_tx_char(mp_obj_t self_in, mp_obj_t c) {
pyb_usart_obj_t *self = self_in;
uint len;
const char *str = mp_obj_str_get_data(c, &len);
if (len == 1 && self->is_enabled) {
usart_tx_char(self, str[0]);
}
return mp_const_none;
}
STATIC mp_obj_t usart_obj_tx_str(mp_obj_t self_in, mp_obj_t s) {
pyb_usart_obj_t *self = self_in;
if (self->is_enabled) {
if (MP_OBJ_IS_STR(s)) {
uint len;
const char *data = mp_obj_str_get_data(s, &len);
usart_tx_strn(self, data, len);
}
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(usart_obj_status_obj, usart_obj_status);
STATIC MP_DEFINE_CONST_FUN_OBJ_1(usart_obj_rx_char_obj, usart_obj_rx_char);
STATIC MP_DEFINE_CONST_FUN_OBJ_2(usart_obj_tx_char_obj, usart_obj_tx_char);
STATIC MP_DEFINE_CONST_FUN_OBJ_2(usart_obj_tx_str_obj, usart_obj_tx_str);
STATIC const mp_map_elem_t usart_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_status), (mp_obj_t)&usart_obj_status_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_recv_chr), (mp_obj_t)&usart_obj_rx_char_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_send_chr), (mp_obj_t)&usart_obj_tx_char_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_send), (mp_obj_t)&usart_obj_tx_str_obj },
};
STATIC MP_DEFINE_CONST_DICT(usart_locals_dict, usart_locals_dict_table);
const mp_obj_type_t pyb_usart_type = {
{ &mp_type_type },
.name = MP_QSTR_Usart,
.print = usart_obj_print,
.make_new = usart_obj_make_new,
.locals_dict = (mp_obj_t)&usart_locals_dict,
};
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