STM32 CAN通信 滤波器配置总结（3） 滤波器, 通信

yuyang911220

/*管脚初始化*/
void CAN_PinInit(void)
{
GPIO_InitTypeDef  GPIO_InitStructure;

/* Configure CAN pin: RX */
GPIO_InitStructure.GPIO_Pin = PIN_CAN_RX;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIO_CAN, &GPIO_InitStructure);

/* Configure CAN pin: TX */
GPIO_InitStructure.GPIO_Pin = PIN_CAN_TX;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//GPIO_Mode_Out_PP;
GPIO_Init(GPIO_CAN, &GPIO_InitStructure);
}
/*CAN1配置函数*/
void CAN_Configuration(void)
{
CAN_InitTypeDef        CAN_InitStructure;
    CAN_FilterInitTypeDef  CAN_FilterInitStructure;

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

// CAN cell init
    CAN_InitStructure.CAN_TTCM=DISABLE;//禁止时间触发通信模式
    CAN_InitStructure.CAN_ABOM=DISABLE;
    CAN_InitStructure.CAN_AWUM=DISABLE;//睡眠模式通过清除sleep位来唤醒
    CAN_InitStructure.CAN_NART=ENABLE;//ENABLE;报文自动重传
    CAN_InitStructure.CAN_RFLM=DISABLE;//接收溢出时，FIFO未锁定
    CAN_InitStructure.CAN_TXFP=DISABLE;//发送的优先级由标示符的大小决定
    CAN_InitStructure.CAN_Mode=CAN_Mode_Normal;//正常模式下

//设置can通讯波特率为50Kbps
    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=45;
    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_FilterScale_16bit; //32bit
    CAN_FilterInitStructure.CAN_FilterIdHigh   = (((u32)slave_id<<21)&0xffff0000)>>16;
CAN_FilterInitStructure.CAN_FilterIdLow   =(((u32)slave_id<<21)|CAN_ID_STD|CAN_RTR_DATA)&0xffff;
    CAN_FilterInitStructure.CAN_FilterMaskIdHigh  = 0xFFFF;
    CAN_FilterInitStructure.CAN_FilterMaskIdLow   = 0xFFFF;
    CAN_FilterInitStructure.CAN_FilterFIFOAssignment=CAN_FIFO0;
    CAN_FilterInitStructure.CAN_FilterActivation=ENABLE;
//时能过滤器
    CAN_FilterInit(&CAN_FilterInitStructure);
    CAN_ITConfig(CAN1,CAN_IT_FMP0|CAN_IT_EPV, ENABLE);
}