CAN过滤器设置的问题

只看该作者 · 2014-5-13 15:54

在设置过滤器时，我是这样设置的：

#define MAKE_ADDR(a) (((a)&0x7f)<<21)
#define CAN_BOARDCAST_ADDR 0x7f

tmp2 = MAKE_ADDR(0x7f);
tmp = MAKE_ADDR(addr);
//tmp = 0;
CAN_FilterInitStructure.CAN_FilterNumber = 0;
CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask;
CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_32bit;
CAN_FilterInitStructure.CAN_FilterIdHigh = tmp >> 16;
CAN_FilterInitStructure.CAN_FilterIdLow = tmp & 0x0ffff;

CAN_FilterInitStructure.CAN_FilterMaskIdHigh = tmp2 >> 16;
CAN_FilterInitStructure.CAN_FilterMaskIdLow = tmp2 & 0x0ffff;
CAN_FilterInitStructure.CAN_FilterFIFOAssignment = CAN_FilterFIFO0;

CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);

tmp = MAKE_ADDR(CAN_BOARDCAST_ADDR);
CAN_FilterInitStructure.CAN_FilterNumber = 1;
CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask;
CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_32bit;

CAN_FilterInitStructure.CAN_FilterIdHigh = tmp >> 16;
CAN_FilterInitStructure.CAN_FilterIdLow = tmp & 0x0ffff;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh = tmp >> 16;
CAN_FilterInitStructure.CAN_FilterMaskIdLow = tmp & 0x0ffff;
CAN_FilterInitStructure.CAN_FilterFIFOAssignment = CAN_FilterFIFO0;
CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);

在发送CAN包时的ID是这样设的：
   //这个包是针对目的地址是0x7f的终端
   tmp = 0x5fe04044;
CANx->sTxMailBox[mailbox_id].TIR = tmp;
/* Set up the DLC */
CANx->sTxMailBox[mailbox_id].TDTR &= (uint32_t)0xFFFFFFF0;
CANx->sTxMailBox[mailbox_id].TDTR |= (dlc & 0x0f);

/* Set up the data field */
CANx->sTxMailBox[mailbox_id].TDLR = data[0];
CANx->sTxMailBox[mailbox_id].TDHR = data[1];
/* Request transmission */
CANx->sTxMailBox[mailbox_id].TIR |= TMIDxR_TXRQ;

但是问题是：接收端收不到数据

3万 · 2014-5-14 15:25

void Can1_NVIC_Config(void)
{
  NVIC_InitTypeDef  NVIC_InitStructure;
  NVIC_InitStructure.NVIC_IRQChannel = CAN1_RX0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

/**
  * @brief  Configures the CAN.
  * @param  None
  * @retval None
  */
void CAN_Config(void)
{
  GPIO_InitTypeDef  GPIO_InitStructure;

  //CAN GPIOs configuration **************************************************
  // Connect CAN pins to AF9
  GPIO_PinAFConfig(CAN_GPIO_RX_PORT, CAN_RX_SOURCE, CAN_AF_PORT);
  GPIO_PinAFConfig(CAN_GPIO_TX_PORT, CAN_TX_SOURCE, CAN_AF_PORT);

  // Configure CAN RX and TX pins
  GPIO_InitStructure.GPIO_Pin =  CAN_TX_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
  GPIO_Init(CAN_GPIO_TX_PORT, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = CAN_RX_PIN ;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
  GPIO_Init(CAN_GPIO_RX_PORT, &GPIO_InitStructure);

  // CAN configuration ********************************************************
  // Enable CAN clock
  RCC_APB1PeriphClockCmd(CAN_CLK, ENABLE);

  // CAN register init
  CAN_DeInit(CANx);

  // 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;
  CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;

  // CAN Baudrate = 1 MBps (CAN clocked at 30 MHz)
//BaudRate = PCLK1/((BS1 + BS2 + 1)*Prescaler)=(168/4)/((5+8+1)*3)=1M
  CAN_InitStructure.CAN_BS1 = CAN_BS1_5tq;
  CAN_InitStructure.CAN_BS2 = CAN_BS2_8tq;
  CAN_InitStructure.CAN_Prescaler = 3;
  CAN_Init(CANx, &CAN_InitStructure);

  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 Structure preparation
  TxMessage.StdId = 0x321;
  TxMessage.ExtId = 0x01;
  TxMessage.RTR = CAN_RTR_DATA;
  TxMessage.IDE = CAN_ID_STD;
  TxMessage.DLC = 8;

  // Enable FIFO 0 message pending Interrupt
  CAN_ITConfig(CANx, CAN_IT_FMP0, ENABLE);
}

3万 · 2014-5-14 15:25

我以前用407，调通过的；
你可以参考下，上面是初始化部分；

只看该作者 · 2014-5-15 11:52

mmuuss586 发表于 2014-5-14 15:25
我以前用407，调通过的；
你可以参考下，上面是初始化部分；

非常感谢你的回复，按照你的设置是可以通过，但是这个设置相当于过滤器没有用啊

只看该作者 · 2014-5-15 13:32

本帖最后由 wyjben 于 2014-5-15 14:52 编辑

      CAN_FilterInitStructure.CAN_FilterMaskIdHigh = tmp >> 16;
      CAN_FilterInitStructure.CAN_FilterMaskIdLow = tmp & 0x0ffff;
   调整这两个位置的值，如用使用扩展ID，用以下方法：
   CAN_FilterInitStructure.CAN_FilterMaskIdLow设置为你想要接收到的ID左移3位，再和0XF8相与；
   CAN_FilterInitStructure.CAN_FilterMaskIdHigh 设置为你想要接收到的ID左移3位，再和0XFF相与；