AVR單片機之間的SPI通信

/******************ATmega16&SPI通信********************************FileName:master.cAuthor:滄海麒麟Date:2011.05.26Version:1.0Description:單片機ATmega16之間的簡單的ＳＰＩ通信*/#include<iom16v.h>//常用頭文件,如有需要可以查庫文件include#include<avrdef.h>#include<macros.h>#include<string.h>#defineuintunsignedint#defineucharunsignedchar#definextal8chardat[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};voidDelay_1ms(void);voidDelay_nms(uintn);voidSPI_MasterPort_init(void);voidSPI_MasterRegisters_init(void);voidSPI_MasterTransmit(charcData);/*********************************************/voidmain(void){uchari=0;SPI_MasterPort_init();SPI_MasterRegisters_init();while(1){for(i=0;i<8;i++) {SPI_MasterTransmit(dat[i]);Delay_nms(500); }//endofif}//endofwhile}//****************************************voidDelay_1ms(void) {uinti;for(i=1;i<(uint)(xtal*143-2);i++);}//=============================================voidDelay_nms(uintn) {uinti=0;while(i<n){Delay_1ms();i++;}}/*=====從機SPI引腳方向定義===============*/voidSPI_MasterPort_init(void){PORTB|=0x40;//SS(PB4自定義)MOSI(PB5自定義)DDRB|=0xB0;//MISO(PB6輸入)SCK(PB7自定義)}//=============================================voidSPI_MasterRegisters_init(void){SPCR=(1<<SPE)|(1<<MSTR)|(1<<SPR0);}//=============================================voidSPI_MasterTransmit(charcData){SPDR=cData;while(!(SPSR&(1<<SPIF)));}/******************ATmega16&SPI通信********************************FileName:slave.cAuthor:滄海麒麟Date:2011.05.26Version:1.0Description:單片機ATmega16之間的簡單的ＳＰＩ通信*/#include<iom16v.h>//常用頭文件,如有需要可以查庫文件include#include<avrdef.h>#include<macros.h>#include<string.h>#defineuintunsignedint#defineucharunsignedchar#definextal8voidDelay_1ms(void);voidDelay_nms(uintn);voidSPI_SlavePort_init(void);voidSPI_SlaveRegisters_init(void);ucharSPI_SlaveReceive(void);//voidSPI_SlaveTransmit(charcData);/*********************************************/voidmain(void){uchartemp;DDRA=0xFF;SPI_SlavePort_init();SPI_SlaveRegisters_init();while(1){temp=SPI_SlaveReceive();//接收一位數(shù)據(jù)SPSR&=~BIT(SPIF);// PORTA=temp; temp=0;}//endofwhile}//****************************************voidDelay_1ms(void) {uinti;for(i=1;i<(uint)(xtal*143-2);i++);}//=============================================voidDelay_nms(uintn) {uinti=0;while(i<n){Delay_1ms();i++;}}/*=====從機SPI引腳方向定義===============*/voidSPI_SlavePort_init(void){PORTB|=0xF0;//SS(PB4輸入)MOSI(PB5輸入)DDRB|=0x00;//MISO(PB6自定義)SCK(PB7輸入)}//=============================================voidSPI_SlaveRegisters_init(void){SPCR=(1<<SPE)|(1<<SPR0);}/*******************************/ucharSPI_