Spi.rar_AVR spi_mega16 spi

#include <iom16v.h> #include <macros.h> #include "lcd0.h" void SPI_SlaveInit(void) { /* 设置MISO 为输出，其他为输入 */ DDRB = (1<<PB6); /* 使能 SPI */ SPCR = (1<<SPE);//PR1 和SPR0 对从机没有影响。 } char SPI_SlaveReceive(void) { uchar clear; while(!(SPSR & (1<<SPIF))) ; clear = SPSR; return SPDR; } char SPI_SlaveTransmit(char cData) { char clear; SPDR = cData; //while(!(SPSR & (1<<SPIF))); clear = SPSR; return SPDR; } void main(void) { uchar x,y; SPI_SlaveInit(); init_lcd(); clrram (); delayms(10); lcd_display_string(0x90,10,"从机发送：");//注意延时 lcd_display_string(0x98,10,"从机接收："); while(1) { PORTB&=~(1<<PB4); delayms(200); PORTB|=(1<<PB4);//不能有？？？ x=SPI_SlaveTransmit(0x39); //send_i(0x96); //send_d(x); send_int(0x96,4,x); delayms(10); /*y=SPI_SlaveReceive(); //send_i(0x9e); //send_d(y); send_int(0x9e,4,y); delayms(10);*/ } }