139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
/**
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******************************************************************************
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* @file syscalls.c
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* @author Suroy Wrote with Auto-generated by STM32CubeIDE
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* @url https://suroy.cn
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* @brief STM32CubeIDE Minimal System calls file
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*
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* For more information about which c-functions
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* need which of these lowlevel functions
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* please consult the Newlib libc-manual
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2020-2022 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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/* Includes */
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#ifndef __SYSCALLS_H
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#define __SYSCALLS_H
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stm32f1xx_hal_uart.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <time.h>
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extern UART_HandleTypeDef huart2;
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/* Variables */
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extern int __io_putchar(int ch) __attribute__((weak));
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extern int __io_getchar(void) __attribute__((weak));
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/* Functions */
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__attribute__((weak)) int _read(int file, char *ptr, int len) {
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(void)file;
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int DataIdx;
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for (DataIdx = 0; DataIdx < len; DataIdx++) {
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*ptr++ = __io_getchar();
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}
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return len;
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}
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__attribute__((weak)) int _write(int file, char *ptr, int len) {
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(void)file;
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int DataIdx;
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for (DataIdx = 0; DataIdx < len; DataIdx++) {
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__io_putchar(*ptr++);
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}
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return len;
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}
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// 条件编译
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#ifdef __GNUC__
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#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
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#define GETCHAR_PROTOTYPE int __io_getchar(void)
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#else
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#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
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#define GETCHAR_PROTOTYPE int fgetc(FILE *f)
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#endif /* __GNUC__ */
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/**
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* 函数功能: 重定向 c库函数 printf到 DEBUG_USARTx
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* 输入参数: 无
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* 返 回 值: 无
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* 说 明：无
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*/
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PUTCHAR_PROTOTYPE {
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HAL_UART_Transmit(&huart2, (uint8_t *)&ch, 1, 0xFFFF); // 阻塞式无限等待
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return ch;
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}
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/**
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* 函数功能: 重定向 c库函数 getchar,scanf到 DEBUG_USARTx
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* 输入参数: 无
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* 返 回 值: 无
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* 说 明：无
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*/
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GETCHAR_PROTOTYPE {
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uint8_t ch = 0;
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HAL_UART_Receive(&huart2, &ch, 1, 0xFFFF);
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return ch;
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}
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/* 非GCC模式才允许编译使用即 Keil、IAR 等 */
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#ifndef __GNUC__
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/**
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* @brief 重定向 C 标准库 printf 函数到串口 huart2
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* 适用于 Keil、IAR 等IDE；不适用 GCC
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* @author Suroy
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* @param ch
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* @param f
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* @return int
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*
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* @usage printf("USART1_Target:\r\n");
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*/
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int fputc(int ch, FILE *f) {
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// 采用轮询方式发送1字节数据，超时时间为无限等待
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HAL_UART_Transmit(&huart2, (uint8_t *)&ch, 1, HAL_MAX_DELAY); // huart2是串口的句柄
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return ch;
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}
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/**
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* @brief fgets 重定向
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* 重定向 C 标准库 scanf 函数到串口 huart2
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* 注意以 空格 为结束
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* @param f
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* @return int
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*
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* @usage scanf("%c", &RecData);
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*/
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int fgetc(FILE *f) {
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uint8_t ch;
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HAL_UART_Receive(&huart2, (uint8_t *)&ch, 1, HAL_MAX_DELAY); // huart2是串口的句柄
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return ch;
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}
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#endif /* __GNUC__ */
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void delay_us(uint16_t us) {
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uint32_t delay = (HAL_RCC_GetHCLKFreq() / 4000000 * us);
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while (delay--);
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}
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#endif
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