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EEPW首頁(yè) > 嵌入式系統 > 設計應用 > STM32 CAN濾波器設置 Identifier filter

STM32 CAN濾波器設置 Identifier filter

作者: 時(shí)間:2016-11-13 來(lái)源:網(wǎng)絡(luò ) 收藏
stm32的屏蔽濾波功能對ID是有要求的,mpc2515你可以直接寫(xiě)ID,但在STM32 這里ID必須進(jìn)行移位處理.

對照下表:

本文引用地址:http://dyxdggzs.com/article/201611/316410.htm

Extended Id濾波器設置(已驗證,只接受Receive_ID節點(diǎn)的數據):

/* CAN filter init */ //設置成只能接受主節點(diǎn) Extended Id:01 的數據 reference manual p557
CAN_FilterInitStructure.CAN_FilterNumber=0;
CAN_FilterInitStructure.CAN_FilterMode=CAN_FilterMode_IdMask;
//CAN_FilterInitStructure.CAN_FilterMode=CAN_FilterMode_IdList;//###########################################
CAN_FilterInitStructure.CAN_FilterScale=CAN_FilterScale_32bit;
CAN_FilterInitStructure.CAN_FilterIdHigh=(((u32)Receive_ID<<3)&0xFFFF0000)>>16;
CAN_FilterInitStructure.CAN_FilterIdLow=(((u32)Receive_ID<<3)|CAN_ID_EXT|CAN_RTR_DATA)&0xFFFF;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0xFFFF;
CAN_FilterInitStructure.CAN_FilterMaskIdLow=0xFFFF; // 1 :must match” or 0: as “don’t care
CAN_FilterInitStructure.CAN_FilterFIFOAssignment=0;
CAN_FilterInitStructure.CAN_FilterActivation=ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);

Standard Id濾波器設置:

CAN_FilterMaskId 位的含義是

Mask
Each bit of the register specifies whether the bit of the associated identifier register must
match with the corresponding bit of the expected identifier or not.
0: Don’t care, the bit is not used for the comparison
1: Must match, the bit of the incoming identifier must have the same level has specified in
the corresponding identifier register of the filter.

我們這里全部設置成1 ,也就是只接受CAN_Filter中設置的節點(diǎn)的數據



關(guān)鍵詞: STM32CAN濾波器設

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