main.c

STM32串口操作源代码 STM32串口操作源代码 STM32串口操作源代码

/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name          : main.c
* Author             : MCD Application Team
* Date First Issued  : 05/21/2007
* Description        : Main program body
********************************************************************************
* History:
* 05/21/2007: V0.3
********************************************************************************
* THE PRESENT SOFTWARE 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 SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"

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

/* Private define ------------------------------------------------------------*/
/*#define USART1_DR_Base  0x40013804	  */
#define USART2_DR_Base  0x40004404
#define USART3_DR_Base  0x40004804
#define TxBufferSize2   380
#define TxBufferSize3   380
#define Port_CAN_ID   0x07
#define Port_UART2_ID 0x08
#define Port_Uart3_ID 0x09

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

/* Private variables ---------------------------------------------------------*/
USART_InitTypeDef USART_InitStructure;
u8 TxBuffer2[TxBufferSize2];
u8 TxBuffer3[TxBufferSize3]; 
u8 RxBuffer2[TxBufferSize2];
u8 RxBuffer3[TxBufferSize3];
u8 UART1_REVDATA[380];
/*volatile TestStatus TransferStatus1 = FAILED;
volatile TestStatus TransferStatus2 = FAILED; 			*/
ErrorStatus HSEStartUpStatus;

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void DMA_Configuration(void);
/*TestStatus Buffercmp(u8* pBuffer1, u8* pBuffer2, u16 BufferLength);		   */

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

/*******************************************************************************
* Function Name  : main
* Description    : Main program
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
  debug();
#endif

  /* 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 Clock disabled
        - USART CPOL: Clock is active low
        - USART CPHA: Data is captured on the second edge 
        - USART LastBit: The clock pulse of the last data bit is not output to 
                         the SCLK pin
  */
  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; /*send a idle frame,cause TXE=1 interupt*/
  USART_InitStructure.USART_Clock = USART_Clock_Disable;
  USART_InitStructure.USART_CPOL = USART_CPOL_Low;
  USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
  USART_InitStructure.USART_LastBit = USART_LastBit_Disable;
  
  /* Configure USART1 */
  USART_Init(USART1, &USART_InitStructure);
  /* Configure USART2 */
  USART_Init(USART2, &USART_InitStructure);

  USART_Init(USART3, &USART_InitStructure);

  /*Enable USART3 DMA RX and TX REQUEST*/
  USART_DMACmd(USART3, USART_DMAReq_Rx | USART_DMAReq_Tx, ENABLE);
  /* Enable USART2 DMA Rx and TX request */
  USART_DMACmd(USART2, USART_DMAReq_Rx | USART_DMAReq_Tx, ENABLE);

  /*USART3 TX DAM CHANNEL*/
  DMA_Cmd(DMA_Channel2, ENABLE);
  /*USART3 RX DMA CHANEL*/
  DMA_Cmd(DMA_Channel3, ENABLE);
  /* Enable DMA Channel6 */
  DMA_Cmd(DMA_Channel6, ENABLE);  
  /* Enable DMA Channel7 */
  DMA_Cmd(DMA_Channel7, ENABLE);

  /* Enable the USART Transmoit interrupt: this interrupt is generated when the 
   USART1 transmit data register is empty */  
  USART_ITConfig(USART1, USART_IT_TXE, ENABLE);	

/* Enable the USART Receive interrupt: this interrupt is generated when the 
   USART1 receive data register is not empty */
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

  /* Enable the USART1 */
  USART_Cmd(USART1, ENABLE);
  /* Enable the USART2 */
  USART_Cmd(USART2, ENABLE);
  USART_Cmd(USART3, ENABLE);

  /* Wait until DMA_Channel 4 Transfer Complete */
  while (DMA_GetFlagStatus(DMA_FLAG_TC4) == RESET)
  {
  }
  /* Wait until DMA_Channel 5 Transfer Complete */
  while (DMA_GetFlagStatus(DMA_FLAG_TC5) == RESET)
  {
  }
  /* Wait until DMA_Channel 6 Transfer Complete */
  while (DMA_GetFlagStatus(DMA_FLAG_TC6) == RESET)
  {
  }
  /* Wait until DMA_Channel 7 Transfer Complete */
  while (DMA_GetFlagStatus(DMA_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)
  {
  }
}

/*******************************************************************************
* Function Name  : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{
  /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();

  if(HSEStartUpStatus == SUCCESS)
  {
    /* HCLK = SYSCLK */
    RCC_HCLKConfig(RCC_SYSCLK_Div1); 
  
    /* PCLK2 = HCLK */
    RCC_PCLK2Config(RCC_HCLK_Div1); 

    /* PCLK1 = HCLK/2 */
    RCC_PCLK1Config(RCC_HCLK_Div2);

    /* Flash 2 wait state */
    FLASH_SetLatency(FLASH_Latency_2);
    /* Enable Prefetch Buffer */
    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

    /* PLLCLK = 8MHz * 9 = 72 MHz */
    RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

    /* Enable PLL */ 
    RCC_PLLCmd(ENABLE);

    /* Wait till PLL is ready */
    while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {
    }

    /* Select PLL as system clock source */
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

    /* Wait till PLL is used as system clock source */
    while(RCC_GetSYSCLKSource() != 0x08)
    {
    }
  }
   
  /* DMA clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA, ENABLE);

  /* Enable USART1, GPIOA, GPIOD and AFIO clocks */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA |
                         RCC_APB2Periph_GPIOB );
  /* Enable USART2 clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN, ENABLE);
}

/*******************************************************************************
* Function Name  : GPIO_Configuration
* Description    : Configures the different GPIO ports.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Enable the USART2 Pins Software Remapping */
  /*GPIO_PinRemapConfig(GPIO_Remap_USART2, ENABLE);		   48pin no remap*/

  /* 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);

  /*PA.03UART2 RX*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /**PB.11UART3 RX*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
  GPIO_Init(GPIOB, &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);

  /*PA2 UART2 TX*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /*PB10 UART3 TX*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
}

/*******************************************************************************
* Function Name  : NVIC_Configuration
* Description    : Configures Vector Table base location.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void NVIC_Configuration(void)
{  
#ifdef  VECT_TAB_RAM  
  /* Set the Vector Table base location at 0x20000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); 
#else  /* VECT_TAB_FLASH  */
  /* Set the Vector Table base location at 0x08000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);   
#endif
/*Enable USART1 interrupt*/
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

/*******************************************************************************
* Function Name  : DMA_Configuration
* Description    : Configures the DMA.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/