畢業設計做的Lin總線，關鍵代碼貼出來。

計算校驗和

unsigned char LINCalcChecksum(unsigned char *data) {unsigned int sum = 0;unsigned char i;for(i = 0; i < 4; i++){sum += data[i];if(sum&0xFF00)sum = (sum&0x00FF) + 1;}sum ^= 0x00FF; return (unsigned char)sum; }

計算校驗位

unsigned char LINCalcParity(unsigned char id) {unsigned char parity, p0,p1;parity=id; p0=(BIT(parity,0)^BIT(parity,1)^BIT(parity,2)^BIT(parity,4))<<6; //偶校驗位p1=(!(BIT(parity,1)^BIT(parity,3)^BIT(parity,4)^BIT(parity,5)))<<7; //奇校驗位parity|=(p0|p1);return parity; }
結構體

//FrameProgress代表從機接收幀的進度， // FrameProgress=0x00代表進度0， // FrameProgress=0x01代表進度1， // FrameProgress=0x02代表進度2， // FrameProgress=0x03代表進度3。 //每當有中斷（sci）發生，先檢測進度根據進度執行相應的代碼段 //進度0：接收0x55，接收成功則設置進度為進度1 //進度1：接收ID ，接收成功則設置進度為進度2 //進度2：接收數據字節，接收成功設置為進度3 //進度3：設置執行標志位(ReceiveLinDataCompleted)為'執行'（True），主程序檢測到執行標志位為'執行'則執行檢查校驗和解析數據字節執行相應的操作 unsigned char LinFrameByte=0x00; unsigned char FrameProgress=0x00;//LinDataProgress是接收Lin幀中的數據字節的進度 unsigned char LinDataProgress =0x00; Bool ReceiveLinDataCompleted = 0;struct LinMessageStruct{unsigned char LinData[5];}; struct LinMessageStruct LinMessage;

串口發送

void SCI發送(unsigned char data) {while(!SCI0SR1_TDRE); SCI0DRL = data; }
串口接收

unsigned char SCI接收(void) {while(!SCI0SR1_RDRF); return(SCI0DRL); }

初始化鎖相環

void INIT_鎖相環(void) {CLKSEL &= 0x7f; PLLCTL &= 0x8F; CRGINT &= 0xDF;#if(BUS_CLOCK == 40000000) SYNR = 0x44;#elif(BUS_CLOCK == 32000000)SYNR = 0x43; #elif(BUS_CLOCK == 24000000)SYNR = 0x42;#endif REFDV = 0x81; PLLCTL =PLLCTL|0x70; asm NOP;asm NOP;while(!(CRGFLG&0x08)); CLKSEL |= 0x80; }

Lin總線應用層代碼

Lin總線應用層代碼

Lin總線應用層代碼

void main(void) {DisableInterrupts;INIT_SCI();//設置為輸出INIT_PLL();//初始化鎖相環 DDRB=0xff;//使能PORTBDDRA=0XFF;//使能PORTAEnableInterrupts; for(;;) { //檢查是否接收幀完成if(ReceiveLinDataCompleted == 1) { //檢查校驗和if(LinMessage.LinData[4]==LINCalcChecksum(LinMessage.LinData)) {if(LinMessage.LinData[0]==0x11) {PORTA_PA0=0;//燈亮}}ReceiveLinDataCompleted =0;}} }

串口中斷接收函數

#pragma CODE_SEG __NEAR_SEG NON_BANKED interrupt void Receivedata(void) { LinFrameByte = SCI_receive(); if(FrameProgress==0x00) { if(LinFrameByte !=0x55){ return; } if(LinFrameByte ==0x55){ FrameProgress=0x01; return; } }if(FrameProgress==0x01) { //暫時不用奇偶校驗if(ID==LinFrameByte) {FrameProgress=0x02;}return;} if(FrameProgress==0x02) { //接收數據if(LinDataProgress==0x00){ LinMessage.LinData[0]=LinFrameByte;LinDataProgress=0x01; return; }if(LinDataProgress==0x01){ LinMessage.LinData[1]=LinFrameByte;LinDataProgress=0x02; return; }if(LinDataProgress==0x02){ LinMessage.LinData[2]=LinFrameByte;LinDataProgress=0x03; return; }if(LinDataProgress==0x03){ LinMessage.LinData[3]=LinFrameByte;LinDataProgress=0x04; return; }if(LinDataProgress==0x04){ LinMessage.LinData[4]=LinFrameByte;LinDataProgress=0x00; }//數據接收完成 ReceiveLinDataCompleted = 1;FrameProgress=0x00;return;} } #pragma CODE_SEG DEFAULT

總結

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