main.c

STM32 库文件

/**
  ******************************************************************************
  * @file USART/DMA_Interrupt/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_DMA_Interrupt
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus;

/* Private define ------------------------------------------------------------*/
#define USART1_DR_Base  0x40013804
#define USART2_DR_Base  0x40004404
#define TxBufferSize1   (countof(TxBuffer1) - 1)
#define TxBufferSize2   (countof(TxBuffer2) - 1)

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

/* Private variables ---------------------------------------------------------*/
USART_InitTypeDef USART_InitStructure;
uint8_t TxBuffer1[] = "USART DMA Interrupt: USART1 -> USART2 using DMA Tx and Rx Flag";
uint8_t TxBuffer2[] = "USART DMA Interrupt: USART2 -> USART1 using DMA Tx and Rx Interrupt";
uint8_t RxBuffer1[TxBufferSize2];
uint8_t RxBuffer2[TxBufferSize1];
uint8_t NbrOfDataToRead = TxBufferSize1;
uint8_t index = 0;
volatile TestStatus TransferStatus1 = FAILED, TransferStatus2 = FAILED;

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void DMA_Configuration(void);
TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);

/* Private functions ---------------------------------------------------------*/

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

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

  /* Configure the DMA */
  DMA_Configuration();

/* USART1 and USART2 configuration -------------------------------------------*/
  /* USART and USART2 configured as follow:
        - BaudRate = 230400 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 = 230400;
  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 USART1 */
  USART_Init(USART1, &USART_InitStructure);
  /* Configure USART2 */
  USART_Init(USART2, &USART_InitStructure);

  /* Enable USART1 DMA TX request */
  USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE);

  /* Enable USART2 DMA TX request */
  USART_DMACmd(USART2, USART_DMAReq_Tx, ENABLE);

  /* Enable the USART2 Receive Interrupt */
  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

  /* Enable DMA1 Channel4 */
  DMA_Cmd(DMA1_Channel4, ENABLE);
  /* Enable DMA1 Channel7 */
  DMA_Cmd(DMA1_Channel7, ENABLE);

  /* Enable the USART1 */
  USART_Cmd(USART1, ENABLE);
  /* Enable the USART2 */
  USART_Cmd(USART2, ENABLE);

  /* Receive the TxBuffer2 */
  while(index < TxBufferSize2)
  {
     while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET)
     {
     }
     RxBuffer1[index++] = USART_ReceiveData(USART1);  
  }

  /* Wait until DMA1_Channel 4 Transfer Complete */
  while (DMA_GetFlagStatus(DMA1_FLAG_TC4) == RESET)
  {
  }
  /* Wait until DMA1_Channel 7 Transfer Complete */
  while (DMA_GetFlagStatus(DMA1_FLAG_TC7) == RESET)
  {
  }
  
  /* Check the received data with the send ones */
  TransferStatus1 = Buffercmp(TxBuffer2, RxBuffer1, TxBufferSize2);
  /* TransferStatus1 = PASSED, if the data transmitted from USART2 and  
     received by USART1 are the same */
  /* TransferStatus1 = FAILED, if the data transmitted from USART2 and 
     received by USART1 are different */
  TransferStatus2 = Buffercmp(TxBuffer1, RxBuffer2, TxBufferSize1);
  /* TransferStatus2 = PASSED, if the data transmitted from USART1 and  
     received by USART2 are the same */
  /* TransferStatus2 = FAILED, if the data transmitted from USART1 and 
     received by USART2 are different */

  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();
    
  /* DMA clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
  /* Enable USART1, GPIOA, GPIOx and AFIO clocks */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA |
                         RCC_APB2Periph_GPIOx | RCC_APB2Periph_AFIO, ENABLE);
  /* Enable USART2 clock */
  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 USART1 Rx (PA.10) as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Configure USART2 Rx as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_RxPin;
  GPIO_Init(GPIOx, &GPIO_InitStructure);
  
  /* Configure USART1 Tx (PA.09) as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Configure USART2 Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_TxPin;
  GPIO_Init(GPIOx, &GPIO_InitStructure);
}

/**
  * @brief  Configures the nested vectored interrupt controller.
  * @param  None
  * @retval : None
  */
void NVIC_Configuration(void)
{
   NVIC_InitTypeDef NVIC_InitStructure;

  /* Enable the USART2 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

/**
  * @brief  Configures the DMA.
  * @param  None
  * @retval : None
  */
void DMA_Configuration(void)
{
  DMA_InitTypeDef DMA_InitStructure;

  /* DMA1 Channel4 (triggered by USART1 Tx event) Config */
  DMA_DeInit(DMA1_Channel4);
  DMA_InitStructure.DMA_PeripheralBaseAddr = USART1_DR_Base;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)TxBuffer1;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = TxBufferSize1;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel4, &DMA_InitStructure);
  
  /* DMA1 Channel7 (triggered by USART2 Tx event) Config */
  DMA_DeInit(DMA1_Channel7);
  DMA_InitStructure.DMA_PeripheralBaseAddr = USART2_DR_Base;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)TxBuffer2;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = TxBufferSize2;
  DMA_Init(DMA1_Channel7, &DMA_InitStructure);
}

/**
  * @brief  Compares two buffers.
  * @param pBuffer1, pBuffer2: buffers to be compared.
  * @param BufferLength: buffer's length
  * @retval : PASSED: pBuffer1 identical to pBuffer2
  *   FAILED: pBuffer1 differs from pBuffer2
  */
TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength)
{
  while(BufferLength--)
  {
    if(*pBuffer1 != *pBuffer2)
    {
      return FAILED;
    }

    pBuffer1++;
    pBuffer2++;
  }

  return PASSED;
}

#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****/