main.c

STM32 库文件

/**
  ******************************************************************************
  * @file USART/Printf/main.c 
  * @author  MCD Application Team
  * @version  V3.0.0
  * @date  04/06/2009
  * @brief  Main program body
  ******************************************************************************
  * @copy
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2009 STMicroelectronics</center></h2>
  */ 

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "stdio.h"
#include "platform_config.h"

/** @addtogroup StdPeriph_Examples
  * @{
  */

/** @addtogroup USART_Printf
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
USART_InitTypeDef USART_InitStructure;

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);

#ifdef __GNUC__
  /* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
     set to 'Yes') calls __io_putchar() */
  #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
  #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */
  
/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program
  * @param  None
  * @retval : None
  */
int main(void)
{
  /* System Clocks Configuration */
  RCC_Configuration();

  /* Configure the GPIO ports */
  GPIO_Configuration();

/* USARTx configuration ------------------------------------------------------*/
  /* USARTx configured as follow:
        - BaudRate = 115200 baud  
        - Word Length = 8 Bits
        - One Stop Bit
        - No parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
  */
  USART_InitStructure.USART_BaudRate = 115200;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No ;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  
  /* Configure the USARTx */ 
  USART_Init(USARTx, &USART_InitStructure);
  /* Enable the USARTx */
  USART_Cmd(USARTx, ENABLE);

  /* Output a message on Hyperterminal using printf function */
  printf("\n\rUSART Printf Example: retarget the C library printf function to the USART\n\r");

  while (1)
  {
  }
}

/**
  * @brief  Configures the different system clocks.
  * @param  None
  * @retval : None
  */
void RCC_Configuration(void)
{
  /* Setup the microcontroller system. Initialize the Embedded Flash Interface,  
     initialize the PLL and update the SystemFrequency variable. */
  SystemInit();
    
  /* Enable GPIOx clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOx, ENABLE);

/* Enable USARTx clocks */
#ifdef USE_USART1  
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
#else
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USARTx, ENABLE);
#endif
}

/**
  * @brief  Configures the different GPIO ports.
  * @param  None
  * @retval : None
  */
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

#if defined USE_USART2	&& defined USE_STM3210B_EVAL
  /* Enable AFIO clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

  /* Enable the USART2 Pins Software Remapping */
  GPIO_PinRemapConfig(GPIO_Remap_USART2, ENABLE);
#endif

  /* Configure USARTx_Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_TxPin;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOx, &GPIO_InitStructure);

  /* Configure USARTx_Rx as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_RxPin;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOx, &GPIO_InitStructure);

}

/**
  * @brief  Retargets the C library printf function to the USART.
  * @param  None
  * @retval : None
  */
PUTCHAR_PROTOTYPE
{
  /* Write a character to the USART */
  USART_SendData(USARTx, (uint8_t) ch);

  /* Loop until the end of transmission */
  while(USART_GetFlagStatus(USARTx, 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) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif

/**
  * @}
  */ 

/**
  * @}
  */ 

/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/