Created
March 27, 2018 23:13
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/********************************************** | |
* | |
* This simple library is used to redirect | |
* functions like printf(), scanf(), putchar() | |
* among other to the UART output on the STM32 | |
* using HAL. | |
* | |
* Credits to the book Mastering STM32 | |
* File by Benjamin Calderon 2017 | |
* | |
***********************************************/ | |
#include "stm32l0xx_hal.h" | |
#include "usart.h" | |
#include <errno.h> | |
#include <sys/stat.h> | |
#include <stdio.h> | |
#define STDIN_FILENO 0 | |
#define STDOUT_FILENO 1 | |
#define STDERR_FILENO 2 | |
UART_HandleTypeDef *gHuart; | |
void RetargetInit(UART_HandleTypeDef *huart) { | |
gHuart = huart; | |
setvbuf(stdout, NULL, _IONBF, 0); | |
} | |
int _isatty(int fd) { | |
if (fd >= STDIN_FILENO && fd <= STDERR_FILENO) | |
return 1; | |
errno = EBADF; | |
return 0; | |
} | |
int _write(int fd, char* ptr, int len) { | |
HAL_StatusTypeDef hstatus; | |
if (fd == STDOUT_FILENO || fd == STDERR_FILENO) { | |
hstatus = HAL_UART_Transmit(gHuart, (uint8_t *) ptr, len, HAL_MAX_DELAY); | |
if (hstatus == HAL_OK) | |
return len; | |
else | |
return EIO; | |
} | |
errno = EBADF; | |
return -1; | |
} | |
int _lseek(int fd, int ptr, int dir) { | |
(void) fd; | |
(void) ptr; | |
(void) dir; | |
errno = EBADF; | |
return -1; | |
} | |
int _read(int fd, char* ptr, int len) { | |
HAL_StatusTypeDef hstatus; | |
if (fd == STDIN_FILENO) { | |
hstatus = HAL_UART_Receive(gHuart, (uint8_t *) ptr, 1, HAL_MAX_DELAY); | |
if (hstatus == HAL_OK) | |
return 1; | |
else | |
return EIO; | |
} | |
errno = EBADF; | |
return -1; | |
} | |
int _fstat(int fd, struct stat* st) { | |
if (fd >= STDIN_FILENO && fd <= STDERR_FILENO) { | |
st->st_mode = S_IFCHR; | |
} | |
errno = EBADF; | |
return -1; | |
} |
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