SPI.rar_ATMEGA128 spi_atmega128 spi_atmega128 s_spi atmega128_s

//主机程序 #include<avr/io.h> #include<util/delay.h> void spi_init(void) { //PORTB |= (1<<PB4); //按照spi协议的握手方式手动操作ss(低）:在开始传输前将其拉低，传输结束后再将其抬高。 PORTB |= (1<<PB0); //DDRB |= (1<<DDB4) | (1<<DDB5) | (1<<DDB7);//ss(低)、sck、mosi 输出方式 DDRB |= (1<<DDB0) | (1<<DDB1) | (1<<DDB2); SPCR = 0x70; //使能spi、主机模式、低位在先、模式0、fosc/2 } void spi_mt(char cData) { //PORTB &=~ (1<<PB4); //开始传输前拉低ss PORTB &=~ (1<<PB0); SPCR |= (1<<MSTR); //设主机模式 SPDR = cData; while(!(SPSR & (1<<SPIF)))//等待传送完毕 ; //PORTB |= (1<<PB4);//传输结束后太高ss PORTB |= (1<<PB0); } /*void delay1s(void) { unsigned char i; for(i=20;i>0;i--) { _delay_loop_2(50000);// 50ms } } */ int main(void) { // unsigned char shuma[10] = {0x81,0xf3,0x49,0x61,0x33,0x25,0x05,0xf1,0x01,0x21}; unsigned char shuma[8] = {0X01,0X02,0X04,0X08,0X10,0X20,0X40,0X80}; spi_init(); unsigned char tmp; while(1) { //for(tmp=0;tmp<10;tmp++) for(tmp=0;tmp<8;tmp++) { spi_mt(shuma[tmp]); //spi_mt(tmp); //delay1s(); _delay_ms(1000); } } }