Question

STM32 CAN 通信 滤波设置问题

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_Mode_Normal CAN_Mode_LoopBack
CAN_InitStructure.CAN_SJW=CAN_SJW_1tq;
CAN_InitStructure.CAN_BS1=CAN_BS1_8tq;
CAN_InitStructure.CAN_BS2=CAN_BS2_3tq;
CAN_InitStructure.CAN_Prescaler=3;
CAN_Init(CAN1, &CAN_InitStructure);
/* CAN filter init */
CAN_FilterInitStructure.CAN_FilterNumber=0;
CAN_FilterInitStructure.CAN_FilterMode=CAN_FilterMode_IdMask;//CAN_FilterMode_IdList 标识符列表模式 CAN_FilterMode_IdMask 标识符屏蔽位模式
CAN_FilterInitStructure.CAN_FilterScale=CAN_FilterScale_32bit;

CAN_FilterInitStructure.CAN_FilterIdHigh=0x0A00;//<<8;//接收ID为0x0A的数据
CAN_FilterInitStructure.CAN_FilterIdLow=0x0000;

//CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0x001f<<8;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0x1F00;//<<8;
CAN_FilterInitStructure.CAN_FilterMaskIdLow=0x0000;
// CAN_FilterInitStructure.CAN_FilterFIFOAssignment=0;
CAN_FilterInitStructure.CAN_FilterFIFOAssignment=CAN_FIFO0;
CAN_FilterInitStructure.CAN_FilterActivation=ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);

使用上面的设置后,CAN 就接收不到数据了,
CAN_FilterInitStructure.CAN_FilterIdHigh=0x0000;//<<8;//接收ID为0x0A的数据
CAN_FilterInitStructure.CAN_FilterIdLow=0x0000;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0x0000;//<<8;
CAN_FilterInitStructure.CAN_FilterMaskIdLow=0x0000;
使用上面的设置,然后用地址判断 能接收到数据。
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Answer 1

首先这个配置使用的是 32位的标识符屏蔽位模式

CAN_FilterIdHigh和CAN_FilterIdLow组合成一个32位寄存器，用来存储将要过滤的ID

CAN_FilterMaskIdHigh和CAN_FilterMaskIdLow组合成一个32位寄存器，用来表示这个ID的哪些位

必须符合（置1），哪些位不care（置0）.

使用标示符屏蔽模式可以实现接收包含特定位的帧，即一系列的帧。

 

CAN的接收邮箱标示符寄存器中，31~3位存储29位的扩展标示符。

 

所以通过滤波器要接收ID为0x0A的帧，

CAN_FilterIdLow = 0x000A << 3; CAN_FilterIdHigh = 0;

CAN_FilterMaskIdLow = 0x00FF << 3; CAN_FilterMaskIdHigh = 0;

 

纯手打，若正确请给辛苦费

Answer 2

我 可以帮你完成的