CAN接收函数的理解

打洞者 · 发表于 2015-11-4 11:00:53

[mw_shl_code=c,true]请教大家，我想知道该函数的参数为什么需要用指针，函数的参数是怎样的引用过程[/mw_shl_code] [mw_shl_code=c,true]void Can_Rx_Msg(u8 fifox,u32 *id,u8 *ide,u8 *rtr,u8 *len,u8 *dat) { *ide=CAN->sFIFOMailBox[fifox].RIR&0x04;//????±ê??·??????????? if(*ide==0)//±ê×?±ê??·? { *id=CAN->sFIFOMailBox[fifox].RIR>>21; }else //?©??±ê??·? { *id=CAN->sFIFOMailBox[fifox].RIR>>3; } *rtr=CAN->sFIFOMailBox[fifox].RIR&0x02; //????????·??????ó??. *len=CAN->sFIFOMailBox[fifox].RDTR&0x0F;//????DLC //*fmi=(CAN->sFIFOMailBox[FIFONumber].RDTR>>8)&0xFF;//????FMI //???????? dat[0]=CAN->sFIFOMailBox[fifox].RDLR&0XFF; dat[1]=(CAN->sFIFOMailBox[fifox].RDLR>>8)&0XFF; dat[2]=(CAN->sFIFOMailBox[fifox].RDLR>>16)&0XFF; dat[3]=(CAN->sFIFOMailBox[fifox].RDLR>>24)&0XFF; dat[4]=CAN->sFIFOMailBox[fifox].RDHR&0XFF; dat[5]=(CAN->sFIFOMailBox[fifox].RDHR>>8)&0XFF; dat[6]=(CAN->sFIFOMailBox[fifox].RDHR>>16)&0XFF; dat[7]=(CAN->sFIFOMailBox[fifox].RDHR>>24)&0XFF; if(fifox==0)CAN->RF0R|=0X20;//??·?FIFO0???? else if(fifox==1)CAN->RF1R|=0X20;//??·?FIFO1???? }[/mw_shl_code]