87 lines
1.6 KiB
C
87 lines
1.6 KiB
C
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#include "syscalls.h"
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extern UART_HandleTypeDef huart1;
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// 条件编译，适配不同平台 (GNU, GCC)
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#ifdef __GNUC__
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__attribute__((weak)) int _read(int file, char *ptr, int len)
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{
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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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{
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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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{
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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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{
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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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#endif
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/**
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* @brief 重定向 C 标准库 printf 函数到串口 huart1
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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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PUTCHAR_PROTOTYPE
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{
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HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, HAL_MAX_DELAY); // 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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* @brief 重定向 c库函数 getchar,scanf到 DEBUG_USARTx
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* 重定向 C 标准库 scanf 函数到串口 huart1
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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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GETCHAR_PROTOTYPE
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{
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uint8_t ch = 0;
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HAL_UART_Receive(&huart1, (uint8_t *)&ch, 1, HAL_MAX_DELAY);
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return ch;
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}
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void delay_us(uint16_t us)
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{
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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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/**
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* @brief 自定义printf
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* @param huart, buf
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* @return void
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*
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* @usage my_printf(HUART1, "USART1_Target:\r\n");
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*/
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void my_printf(UART_HandleTypeDef *huart, const char *buf, ...)
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{
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char str[255] = {0};
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va_list v;
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va_start(v, buf);
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vsprintf(str, buf, v);
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HAL_UART_Transmit(huart, (const uint8_t *)str, strlen(str), 0xff);
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va_end(v);
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}
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