main.c

STM32 库文件

/**
  ******************************************************************************
  * @file CAN/LoopBack/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"

/* Local includes ------------------------------------------------------------*/

/** @addtogroup StdPeriph_Examples
  * @{
  */

/** @addtogroup CAN_LoopBack
  * @{
  */ 

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

/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO uint32_t ret = 0; /* for return of the interrupt handling */
volatile TestStatus TestRx;

/* Private functions ---------------------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
TestStatus CAN_Polling(void);
TestStatus CAN_Interrupt(void);

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

  /* NVIC Configuration */
  NVIC_Configuration();
  
  /* GPIO ports pins Configuration */
  GPIO_Configuration();
  
  GPIO_ResetBits(GPIO_LED, GPIO_Pin_6);
  GPIO_ResetBits(GPIO_LED, GPIO_Pin_7);
  GPIO_ResetBits(GPIO_LED, GPIO_Pin_8);
  GPIO_ResetBits(GPIO_LED, GPIO_Pin_9);
  
  /* CAN transmit at 100Kb/s and receive by polling in loopback mode */
  TestRx = CAN_Polling();

  if (TestRx == FAILED)
  {
    /* Turn on led connected to GPIO_LED pin8 (LD3) */
    GPIO_SetBits(GPIO_LED, GPIO_Pin_8);
  }
  else
  {
    /* Turn on led connected to GPIO_LED pin6 (LD1) */
    GPIO_SetBits(GPIO_LED, GPIO_Pin_6);
  }

  /* CAN transmit at 500Kb/s and receive by interrupt in loopback mode */
  TestRx = CAN_Interrupt();

  if (TestRx == FAILED)
  {
    /* Turn on led connected to GPIO_LED pin9 (LD4) */
    GPIO_SetBits(GPIO_LED, GPIO_Pin_9); 
  }
  else
  {
    /* Turn on led connected to GPIO_LED pin7 (LD2) */
    GPIO_SetBits(GPIO_LED, GPIO_Pin_7);
  }
  
  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. */
  /* The System frequency should be set to HSE frequency */
  SystemInit();
  
  /* GPIO for CAN and GPIO for LEDs clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO |RCC_APB2Periph_GPIO_CAN | RCC_APB2Periph_GPIO_LED, ENABLE);

  /* CAN1 Periph clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
}

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

  /* Configure GPIO_LED pin6, pin7, pin8 and pin9 as Output push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIO_LED, &GPIO_InitStructure);

  /* Configure CAN pin: RX */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_RX;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_Init(GPIO_CAN, &GPIO_InitStructure);
  
  /* Configure CAN pin: TX */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_TX;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIO_CAN, &GPIO_InitStructure);
  
  GPIO_PinRemapConfig(GPIO_Remap_CAN , ENABLE);
}

/**
  * @brief  Configures the NVIC and Vector Table base address.
  * @param  None
  * @retval : None
  */
void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

  /* Enable CAN1 RX0 interrupt IRQ channel */
  NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

/**
  * @brief  Configures the CAN, transmit and receive by polling
  * @param  None
  * @retval : PASSED if the reception is well done, FAILED in other case
  */
TestStatus CAN_Polling(void)
{
  CAN_InitTypeDef        CAN_InitStructure;
  CAN_FilterInitTypeDef  CAN_FilterInitStructure;
  CanTxMsg TxMessage;
  CanRxMsg RxMessage;
  uint32_t i = 0;
  uint8_t TransmitMailbox = 0;

  /* CAN register init */
  CAN_DeInit(CAN1);
  CAN_StructInit(&CAN_InitStructure);

  /* CAN cell init */
  CAN_InitStructure.CAN_TTCM=DISABLE;
  CAN_InitStructure.CAN_ABOM=DISABLE;
  CAN_InitStructure.CAN_AWUM=DISABLE;
  CAN_InitStructure.CAN_NART=DISABLE;
  CAN_InitStructure.CAN_RFLM=DISABLE;
  CAN_InitStructure.CAN_TXFP=DISABLE;
  CAN_InitStructure.CAN_Mode=CAN_Mode_LoopBack;
  CAN_InitStructure.CAN_SJW=CAN_SJW_1tq;
  CAN_InitStructure.CAN_BS1=CAN_BS1_8tq;
  CAN_InitStructure.CAN_BS2=CAN_BS2_7tq;
  CAN_InitStructure.CAN_Prescaler=5;
  CAN_Init(CAN1, &CAN_InitStructure);

  /* CAN filter init */
  CAN_FilterInitStructure.CAN_FilterNumber=0;
  CAN_FilterInitStructure.CAN_FilterMode=CAN_FilterMode_IdMask;
  CAN_FilterInitStructure.CAN_FilterScale=CAN_FilterScale_32bit;
  CAN_FilterInitStructure.CAN_FilterIdHigh=0x0000;
  CAN_FilterInitStructure.CAN_FilterIdLow=0x0000;
  CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0x0000;
  CAN_FilterInitStructure.CAN_FilterMaskIdLow=0x0000;
  CAN_FilterInitStructure.CAN_FilterFIFOAssignment=0;
  CAN_FilterInitStructure.CAN_FilterActivation=ENABLE;
  CAN_FilterInit(&CAN_FilterInitStructure);

  /* transmit */
  TxMessage.StdId=0x11;
  TxMessage.RTR=CAN_RTR_DATA;
  TxMessage.IDE=CAN_ID_STD;
  TxMessage.DLC=2;
  TxMessage.Data[0]=0xCA;
  TxMessage.Data[1]=0xFE;

  TransmitMailbox=CAN_Transmit(CAN1, &TxMessage);
  i = 0;
  while((CAN_TransmitStatus(CAN1, TransmitMailbox) != CANTXOK) && (i != 0xFF))
  {
    i++;
  }

  i = 0;
  while((CAN_MessagePending(CAN1, CAN_FIFO0) < 1) && (i != 0xFF))
  {
    i++;
  }

  /* receive */
  RxMessage.StdId=0x00;
  RxMessage.IDE=CAN_ID_STD;
  RxMessage.DLC=0;
  RxMessage.Data[0]=0x00;
  RxMessage.Data[1]=0x00;
  CAN_Receive(CAN1, CAN_FIFO0, &RxMessage);

  if (RxMessage.StdId!=0x11)
  {
    return FAILED;  
  }

  if (RxMessage.IDE!=CAN_ID_STD)
  {
    return FAILED;
  }

  if (RxMessage.DLC!=2)
  {
    return FAILED;  
  }

  if ((RxMessage.Data[0]<<8|RxMessage.Data[1])!=0xCAFE)
  {
    return FAILED;
  }
  
  return PASSED; /* Test Passed */
}

/**
  * @brief  Configures the CAN, transmit and receive using interrupt.
  * @param  None
  * @retval : PASSED if the reception is well done, FAILED in other case
  */
TestStatus CAN_Interrupt(void)
{
  CAN_InitTypeDef        CAN_InitStructure;
  CAN_FilterInitTypeDef  CAN_FilterInitStructure;
  CanTxMsg TxMessage;
  uint32_t i = 0;

  /* CAN register init */
  CAN_DeInit(CAN1);
  CAN_StructInit(&CAN_InitStructure);

  /* CAN cell init */
  CAN_InitStructure.CAN_TTCM=DISABLE;
  CAN_InitStructure.CAN_ABOM=DISABLE;
  CAN_InitStructure.CAN_AWUM=DISABLE;
  CAN_InitStructure.CAN_NART=DISABLE;
  CAN_InitStructure.CAN_RFLM=DISABLE;
  CAN_InitStructure.CAN_TXFP=DISABLE;
  CAN_InitStructure.CAN_Mode=CAN_Mode_LoopBack;
  CAN_InitStructure.CAN_SJW=CAN_SJW_1tq;
  CAN_InitStructure.CAN_BS1=CAN_BS1_8tq;
  CAN_InitStructure.CAN_BS2=CAN_BS2_7tq;
  CAN_InitStructure.CAN_Prescaler=1;
  CAN_Init(CAN1, &CAN_InitStructure);

  /* CAN filter init */
  CAN_FilterInitStructure.CAN_FilterNumber=1;
  CAN_FilterInitStructure.CAN_FilterMode=CAN_FilterMode_IdMask;
  CAN_FilterInitStructure.CAN_FilterScale=CAN_FilterScale_32bit;
  CAN_FilterInitStructure.CAN_FilterIdHigh=0x0000;
  CAN_FilterInitStructure.CAN_FilterIdLow=0x0000;
  CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0x0000;
  CAN_FilterInitStructure.CAN_FilterMaskIdLow=0x0000;
  CAN_FilterInitStructure.CAN_FilterFIFOAssignment=CAN_FIFO0;
  CAN_FilterInitStructure.CAN_FilterActivation=ENABLE;
  CAN_FilterInit(&CAN_FilterInitStructure);

  /* CAN FIFO0 message pending interrupt enable */ 
  CAN_ITConfig(CAN1, CAN_IT_FMP0, ENABLE);

  /* transmit 1 message */
  TxMessage.StdId=0x00;
  TxMessage.ExtId=0x1234;
  TxMessage.IDE=CAN_ID_EXT;
  TxMessage.RTR=CAN_RTR_DATA;
  TxMessage.DLC=2;
  TxMessage.Data[0]=0xDE;
  TxMessage.Data[1]=0xCA;
  CAN_Transmit(CAN1, &TxMessage);

  /* initialize the value that will be returned */
  ret = 0xFF;
       
  /* receive message with interrupt handling */
  i=0;
  while((ret == 0xFF) && (i < 0xFFF))
  {
    i++;
  }
  
  if (i == 0xFFF)
  {
    ret=0;  
  }

  /* disable interrupt handling */
  CAN_ITConfig(CAN1, CAN_IT_FMP0, DISABLE);

  return (TestStatus)ret;
}

#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****/