main.c

STM32 库文件

/**
  ******************************************************************************
  * @file USART/HyperTerminal_HwFlowControl/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 "platform_config.h"

/** @addtogroup StdPeriph_Examples
  * @{
  */

/** @addtogroup USART_HyperTerminal_HwFlowControl
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define TxBufferSize   (countof(TxBuffer) - 1)
#define RxBufferSize   0xFF

/* Private macro -------------------------------------------------------------*/
#define countof(a)   (sizeof(a) / sizeof(*(a)))

/* Private variables ---------------------------------------------------------*/
USART_InitTypeDef USART_InitStructure;
uint8_t TxBuffer[] = "\n\rUSART Hyperterminal Hardware Flow Control Example: USART - \
Hyperterminal communication using hardware flow control\n\r";
uint8_t RxBuffer[RxBufferSize];
uint8_t NbrOfDataToTransfer = TxBufferSize;
uint8_t TxCounter = 0;
uint8_t RxCounter = 0;

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

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

  /* Configure the GPIO ports */
  GPIO_Configuration();
  
/* USART2 configuration ------------------------------------------------------*/
  /* USART2 configured as follow:
        - BaudRate = 115200 baud  
        - Word Length = 8 Bits
        - One Stop Bit
        - No parity
        - Hardware flow control enabled (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_RTS_CTS;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

  USART_Init(USART2, &USART_InitStructure);
  /* Enable the USART2 */
  USART_Cmd(USART2, ENABLE);

/* Communication hyperterminal-USART2 using hardware flow control -------------*/
  /* Send a buffer from USART to hyperterminal */  
  while(NbrOfDataToTransfer--)
  {
    USART_SendData(USART2, TxBuffer[TxCounter++]);
    while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);          
  }
  
  /* Receive a string (Max RxBufferSize bytes) from the Hyperterminal ended by '\r' (Enter key) */
  do
  { 
    if((USART_GetFlagStatus(USART2, USART_FLAG_RXNE) != RESET)&&(RxCounter < RxBufferSize))
    {
       RxBuffer[RxCounter] = USART_ReceiveData(USART2);
       USART_SendData(USART2, RxBuffer[RxCounter++]);
    }   
 
  }while((RxBuffer[RxCounter - 1] != '\r')&&(RxCounter != RxBufferSize));

  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 and AFIO clocks */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOx | RCC_APB2Periph_AFIO, ENABLE);

  /* Enable USART2 clocks */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
}

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

#ifdef USE_STM3210B_EVAL  
  /* Enable the USART2 Pins Software Remapping */
  GPIO_PinRemapConfig(GPIO_Remap_USART2, ENABLE);
#endif

  /* Configure USART2 RTS and USART2 Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_RTSPin | GPIO_TxPin;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOx, &GPIO_InitStructure);

  /* Configure USART2 CTS and USART2 Rx as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_CTSPin | GPIO_RxPin;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOx, &GPIO_InitStructure);
}

#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****/