Stm32F4Discoverykit Can Bus Sorunu

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Merhaba ,

Gömülü Sistemler dersi proje kapsamında Can bus protokolü ile ilgili bir projem var .

Stm32f4 ile dış dünyadan(sensör ile) aldığım bilgileri can bus hattıyla Beagle Bone göndereceğim ve okunan bilginin de webte gösterilmesini yapacağım.

Aşağıda yazdığım kodu çalıştırıyorum ama osiloskop ortamında bir çıkış göremiyorum kodun çalışıp çalışmadığını nasıl denetleyebilirim . Osiloskopta sinyal göremediğim için çalışmıyor büyük ihtimalle ama osiloskopta sinyalin hızı yüksek olduğu için veya bağlantı hatalarım yüzüden göremiyor olma ihtimalim de var.

Aşağıda kendi kodumu paylaşıyorum. Yardımlarınız için teşekkürler şimdiden. Tranciever olarak sn65vd230 kullanıyorum.

[code] #include "stm32f4xx.h"
 
int main(void)
{
  GPIO_InitTypeDef      GPIO_InitStructure;
  RCC_ClocksTypeDef     RCC_Clocks;
  CAN_InitTypeDef       CAN_InitStructure;
  CAN_FilterInitTypeDef CAN_FilterInitStructure;
 
  CanTxMsg TxMessage;
  
  RCC_GetClocksFreq(&RCC_Clocks);
 
  /* CAN GPIOs configuration **************************************************/
  /* Enable GPIO clock */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
 
  /* Connect CAN pins */
  GPIO_PinAFConfig(GPIOD, GPIO_PinSource0, GPIO_AF_CAN1);
  GPIO_PinAFConfig(GPIOD, GPIO_PinSource1, GPIO_AF_CAN1);
 
  /* Configure CAN RX and TX pins */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOD, &GPIO_InitStructure);
 
  /* CAN configuration ********************************************************/
  /* Enable CAN clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
 
  /* 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_Normal;
 
  /* quanta 1+6+7 = 14, 14 * 3 = 42, 42000000 / 42 = 1000000 */
  /* CAN Baudrate = 1Mbps (CAN clocked at 42 MHz) Prescale = 3 */
 
  /* Requires a clock with integer division into APB clock */
 
  CAN_InitStructure.CAN_SJW = CAN_SJW_1tq; // 1+6+7 = 14, 1+14+6 = 21, 1+15+5 = 21
  CAN_InitStructure.CAN_BS1 = CAN_BS1_6tq;
  CAN_InitStructure.CAN_BS2 = CAN_BS2_7tq;
  CAN_InitStructure.CAN_Prescaler = RCC_Clocks.PCLK1_Frequency / (14 * 1000000); // quanta by baudrate
 
  CAN_Init(CAN1, &CAN_InitStructure);
 
  /* CAN filter init */
  CAN_FilterInitStructure.CAN_FilterNumber = 0; // CAN1 [ 0..13]
 
  CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask; // IdMask or IdList
  CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_32bit; // 16 or 32
 
  CAN_FilterInitStructure.CAN_FilterIdHigh      = 0x0000; // Everything, otherwise 11-bit in top bits
  CAN_FilterInitStructure.CAN_FilterIdLow       = 0x0000;
  CAN_FilterInitStructure.CAN_FilterMaskIdHigh  = 0x0000;
  CAN_FilterInitStructure.CAN_FilterMaskIdLow   = 0x0000;
 
  CAN_FilterInitStructure.CAN_FilterFIFOAssignment = CAN_FIFO0; // Rx
  CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
 
  CAN_FilterInit(&CAN_FilterInitStructure);
 
  // transmit */
  TxMessage.StdId = 0x123;
  TxMessage.ExtId = 0x00;
  TxMessage.RTR = CAN_RTR_DATA;
  TxMessage.IDE = CAN_ID_STD;
  TxMessage.DLC = 8;
 
  TxMessage.Data[0] = 0x02;
  TxMessage.Data[1] = 0x11;
  TxMessage.Data[2] = 0x11;
  TxMessage.Data[3] = 0x11;
 
  while(1) // Do not want to exit
  {
    volatile uint32_t i;
    static int j = 0;
    uint8_t TransmitMailbox = 0;
 
    TxMessage.Data[4] = (j >>  0) & 0xFF; // Cycling
    TxMessage.Data[5] = (j >>  8) & 0xFF;
    TxMessage.Data[6] = (j >> 16) & 0xFF;
    TxMessage.Data[7] = (j >> 24) & 0xFF;
    j++;
 
    TransmitMailbox = CAN_Transmit(CAN1, &TxMessage);
 
    i = 0;
    while((CAN_TransmitStatus(CAN1, TransmitMailbox) != CANTXOK) && (i != 0xFFFFFF)) // Wait on Transmit
    {
      i++;
    }
  }
}
 
#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

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