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STM32F10X can loopback 通讯

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ID:398216 发表于 2018-9-15 14:30 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "stm32_eval.h"
/** @addtogroup STM32F10x_StdPeriph_Examples
  * @{
  */
/** @addtogroup CAN_LoopBack
  * @{
  */

/* Private define ------------------------------------------------------------*/
#define __CAN1_USED__
/* #define __CAN2_USED__*/   /* Please check that you device is
                                Connectivity line when using CAN2 */
#ifdef  __CAN1_USED__
  #define CANx CAN1
#else /*__CAN2_USED__*/
  #define CANx CAN2
#endif  /* __CAN1_USED__ */
/* Private typedef -----------------------------------------------------------*/
typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus;
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO uint32_t ret = 0; /* for return of the interrupt handling */
volatile TestStatus TestRx;
/* Private function prototypes -----------------------------------------------*/
void NVIC_Configuration(void);
TestStatus CAN_Polling(void);
TestStatus CAN_Interrupt(void);
/* Private functions ---------------------------------------------------------*/
/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured,
       this is done through SystemInit() function which is called from startup
       file (startup_stm32f10x_xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32f10x.c file
     */     
      

#ifdef  __CAN1_USED__
  /* CANx Periph clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
#else /*__CAN2_USED__*/
  /* CAN1 & 2  Periph clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN2, ENABLE);
#endif  /* __CAN1_USED__ */
  /* NVIC Configuration */
  NVIC_Configuration();
  
  /* Configures LED 1..4 */
  STM_EVAL_LEDInit(LED1);
  STM_EVAL_LEDInit(LED2);
  STM_EVAL_LEDInit(LED3);
  STM_EVAL_LEDInit(LED4);
  
  /* Turns selected LED Off */  
  STM_EVAL_LEDOff(LED1);
  STM_EVAL_LEDOff(LED2);
  STM_EVAL_LEDOff(LED3);
  STM_EVAL_LEDOff(LED4);
  
  /* CAN transmit at 125Kb/s and receive by polling in loopback mode */
  TestRx = CAN_Polling();
  if (TestRx == FAILED)
  {
    /* Turn on led LD3 */
    STM_EVAL_LEDOn(LED3);
  }
  else
  {
    /* Turn on led LD1 */
    STM_EVAL_LEDOn(LED1);
  }
  /* CAN transmit at 500Kb/s and receive by interrupt in loopback mode */
  TestRx = CAN_Interrupt();
  if (TestRx == FAILED)
  {
    /* Turn on led LD4 */
    STM_EVAL_LEDOn(LED4);
  }
  else
  {
    /* Turn on led LD2 */
    STM_EVAL_LEDOn(LED2);
  }
  /* Infinite loop */
  while (1)
  {
  }
}
/**
  * @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(CANx);
  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;
  
  /* Baudrate = 125kbps*/
  CAN_InitStructure.CAN_SJW=CAN_SJW_1tq;
  CAN_InitStructure.CAN_BS1=CAN_BS1_2tq;
  CAN_InitStructure.CAN_BS2=CAN_BS2_3tq;
  CAN_InitStructure.CAN_Prescaler=48;
  CAN_Init(CANx, &CAN_InitStructure);
  /* CAN filter init */
#ifdef  __CAN1_USED__
  CAN_FilterInitStructure.CAN_FilterNumber=0;
#else /*__CAN2_USED__*/
  CAN_FilterInitStructure.CAN_FilterNumber=14;
#endif  /* __CAN1_USED__ */
  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(CANx, &TxMessage);
  i = 0;
  while((CAN_TransmitStatus(CANx, TransmitMailbox) != CANTXOK) && (i != 0xFFFF))
  {
    i++;
  }
  i = 0;
  while((CAN_MessagePending(CANx, CAN_FIFO0) < 1) && (i != 0xFFFF))
  {
    i++;
  }
  /* receive */
  RxMessage.StdId=0x00;
  RxMessage.IDE=CAN_ID_STD;
  RxMessage.DLC=0;
  RxMessage.Data[0]=0x00;
  RxMessage.Data[1]=0x00;
  CAN_Receive(CANx, 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(CANx);

  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;
  
  /* Baudrate = 500 Kbps */
  CAN_InitStructure.CAN_BS1=CAN_BS1_2tq;
  CAN_InitStructure.CAN_BS2=CAN_BS2_3tq;
  CAN_InitStructure.CAN_Prescaler=12;
  CAN_Init(CANx, &CAN_InitStructure);
  /* CAN filter init */
#ifdef  __CAN1_USED__
  CAN_FilterInitStructure.CAN_FilterNumber=1;
#else /*__CAN2_USED__*/
  CAN_FilterInitStructure.CAN_FilterNumber=15;
#endif  /* __CAN1_USED__ */
  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(CANx, CAN_IT_FMP0, ENABLE);
  /* transmit 1 message */
  TxMessage.StdId=0;
  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(CANx, &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(CANx, CAN_IT_FMP0, DISABLE);
  return (TestStatus)ret;
}
/**
  * @brief  Configures the NVIC and Vector Table base address.
  * @param  None
  * @retval None
  */
void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
  /* Enable CANx RX0 interrupt IRQ channel */
#ifndef STM32F10X_CL
#ifdef  __CAN1_USED__
  NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
#else  /*__CAN2_USED__*/
  /* CAN2 is not implemented in the device */
   #error "CAN2 is implemented only in Connectivity line devices"
  
#endif /*__CAN1_USED__*/
#else
#ifdef  __CAN1_USED__
  NVIC_InitStructure.NVIC_IRQChannel = CAN1_RX0_IRQn;
#else  /*__CAN2_USED__*/
  NVIC_InitStructure.NVIC_IRQChannel = CAN2_RX0_IRQn;
#endif /*__CAN1_USED__*/
#endif /* STM32F10X_CL*/
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}
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ID:1 发表于 2018-9-15 16:29 | 只看该作者
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