stm32之can总线过滤器研究
stm32的can总线的配置如下: 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;
CAN_InitStructure.CAN_NART=DISABLE;
//CAN报文只被发送1次,不管发送的结果如何(成功、出错或仲裁丢失)
CAN_InitStructure.CAN_RFLM=DISABLE;
CAN_InitStructure.CAN_TXFP=DISABLE;
CAN_InitStructure.CAN_Mode=CAN_Mode_Normal;
//CAN_Mode_LoopBack
//CAN_Mode_Normal
CAN_InitStructure.CAN_SJW=CAN_SJW_1tq;
CAN_InitStructure.CAN_BS1=CAN_BS1_5tq;
//1--16
CAN_InitStructure.CAN_BS2=CAN_BS2_2tq;
//1--8
CAN_InitStructure.CAN_Prescaler=2;
CAN_Init(&CAN_InitStructure);
/* CAN filter init */
CAN_FilterInitStructure.CAN_FilterNumber=0;
//选择过滤器0
CAN_FilterInitStructure.CAN_FilterMode=CAN_FilterMode_IdMask;
//指定过滤器被设置为标识符屏蔽模式
CAN_FilterInitStructure.CAN_FilterScale=CAN_FilterScale_32bit;
//给出过滤器位宽为32位 下面根据设置的参数不同来决定can总线can总线的配置情况: 1、对扩展数据帧进行过滤:(只接收扩展数据帧)
CAN_FilterInitStructure.CAN_FilterIdHigh= (((u32)slave_id<<3)&0xFFFF0000)>>16;
CAN_FilterInitStructure.CAN_FilterIdLow= (((u32)slave_id<<3)|CAN_ID_EXT|CAN_RTR_DATA)&0xFFFF;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh= 0xFFFF;
CAN_FilterInitStructure.CAN_FilterMaskIdLow= 0xFFFF;
(注:标准帧数据帧、标准远程帧和扩展远程帧均被过滤)
2、对扩展远程帧过滤:(只接收扩展远程帧)
CAN_FilterInitStructure.CAN_FilterIdHigh= (((u32)slave_id<<3)&0xFFFF0000)>>16;
CAN_FilterInitStructure.CAN_FilterIdLow= (((u32)slave_id<<3)|CAN_ID_EXT|CAN_RTR_REMOTE)&0xFFFF;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh= 0xFFFF;
CAN_FilterInitStructure.CAN_FilterMaskIdLow= 0xFFFF;
3、对标准远程帧过滤:(只接收标准远程帧)
CAN_FilterInitStructure.CAN_FilterIdHigh= (((u32)slave_id<<21)&0xffff0000)>>16;
CAN_FilterInitStructure.CAN_FilterIdLow= (((u32)slave_id<<21)|CAN_ID_STD|CAN_RTR_REMOTE)&0xffff;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh= 0xFFFF;
CAN_FilterInitStructure.CAN_FilterMaskIdLow= 0xFFFF;
4、对标准数据帧过滤:(只接收标准数据帧)
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;
5、对扩展帧进行过滤:(扩展帧不会被过滤掉)
CAN_FilterInitStructure.CAN_FilterIdHigh= (((u32)slave_id<<3)&0xFFFF0000)>>16;
CAN_FilterInitStructure.CAN_FilterIdLow= (((u32)slave_id<<3)|CAN_ID_EXT)&0xFFFF;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh= 0xFFFF;
CAN_FilterInitStructure.CAN_FilterMaskIdLow= 0xFFFC;
6、对标准帧进行过滤:(标准帧不会被过滤掉)
CAN_FilterInitStructure.CAN_FilterIdHigh= (((u32)slave_id<<21)&0xffff0000)>>16;
CAN_FilterInitStructure.CAN_FilterIdLow= (((u32)slave_id<<21)|CAN_ID_STD)&0xffff;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh= 0xFFFF;
CAN_FilterInitStructure.CAN_FilterMaskIdLow= 0xFFFC;
注:slave_id为要过滤的id号。 【stm32之can总线过滤器研究】转载于:https://www.cnblogs.com/liufang/p/3709864.html
推荐阅读
- PMSJ寻平面设计师之现代(Hyundai)
- 太平之莲
- 闲杂“细雨”
- 七年之痒之后
- 深入理解Go之generate
- 由浅入深理解AOP
- 期刊|期刊 | 国内核心期刊之(北大核心)
- 生活随笔|好天气下的意外之喜
- 感恩之旅第75天
- python学习之|python学习之 实现QQ自动发送消息