N32使用CAN列表模式过滤指定ID报文

发表于 2022-12-5 15:49

在CAN使用过程中，需要对总线上的报文做接收处理，但一般使用场景来说，总线上报文繁多，我们不会对总线上所有的报文全部接收，只需要接收我们需要的报文即可，下面小编通过典型实例来介绍一下如何配置过滤器来实现对特定ID报文的接收

发表于 2022-12-5 15:50

例1：需要过滤一个ID为0x22A的数据标准帧，将过滤器初始化函数这样配置即可（以N32G45X为例）：

#define CAN_FILTER_STDID(STDID) ((STDID&0x7FF)<<5)

#define CAN_STD_ID_H_MASK_DONT_CARE 0x0000

#define CAN_STD_ID_L_MASK_DONT_CARE 0x0000

void CAN_Filter_Init(void)

{

CAN_FilterInitType CAN_FilterInitStructure;

CAN_FilterInitStructure.Filter_Num = CAN_FILTERNUM0;

CAN_FilterInitStructure.Filter_Mode = CAN_Filter_IdListMode;

CAN_FilterInitStructure.Filter_Scale = CAN_Filter_32bitScale;

CAN_FilterInitStructure.Filter_HighId = CAN_FILTER_STDID(0x22A);

CAN_FilterInitStructure.Filter_LowId = CAN_FILTER_STDID(0x22A);

CAN_FilterInitStructure.FilterMask_HighId = CAN_STD_ID_H_MASK_DONT_CARE;

CAN_FilterInitStructure.FilterMask_LowId = CAN_STD_ID_L_MASK_DONT_CARE;

CAN_FilterInitStructure.Filter_FIFOAssignment = CAN_FIFO0;

CAN_FilterInitStructure.Filter_Act = ENABLE;

CAN1_InitFilter(&CAN_FilterInitStructure);

}

发表于 2022-12-5 15:51

例2：需要过滤一个ID为0x18FF0320的数据扩展帧，我们将过滤器初始化函数这样配置即可（以N32G45X为例）：

#define CAN_FILTER_EXTID_H(EXTID) ((EXTID<<3)>>16)&0xffff

#define CAN_FILTER_EXTID_L(EXTID) ((EXTID)<<3)&0xffff | CAN_ID_EXT