9G-STM32 MDK-ARM开发过程简介（3） character, function, library, return, source

/**
  * @brief  Retargets the C library printf function to the USART.
  * @param  None
  * @retval None
  */
int fputc(int ch, FILE *f)
{
  /* Place your implementation of fputc here */
  /* e.g. write a character to the USART */
  USART_SendData(USART1, (uint8_t) ch);
  /* Loop until the end of transmission */
  while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
  {}
  return ch;
}
#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *   where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  printf("Wrong parameters value: file %s on line %d\r\n", file, line);
  /* Infinite loop */
  while (1)
  {
  }
}
#endif
/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/
2,main.c文件
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "stm32f10x_conf.h"
#include
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
extern void UART_Configuration(void);
/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
int main(void)
{
/* Setup STM32 system (clock, PLL and Flash configuration) */
  SystemInit();
  UART_Configuration();
  /* Output a message on Hyperterminal using printf function */
  printf("\n\r\n\r\n\r\n\r");
  printf("*** STM32-MDK V1.0 Build by yuanxihua@21cn.com on ("__DATE__ " - " __TIME__ ")\n\r");
  printf("*** STM32-MDK V1.0 Rebooting ...\n\r");
  /* Add your application code here
     */
  /* Infinite loop */
  while (1)
  {
  }
}
/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/