用两个Atmega16的单片机进行SPI通讯。收到神么就在C管脚显示什么
以下是proteus的截图:虽然数码管接的不对但管脚可以看出数据是正确的
主机程序：
- /*
- * GccApplication5.c
- *
- * Created: 2014-9-29 19:46:18
- * Author: Administrator
- */
- #include <avr/io.h>
- #define DD_SS 4 //ss
- #define DD_MOSI 5 //MOSI
- #define DD_SCK 7 //SCK
- void SPI_MasterInit()
- {
- DDRB = (1<<DD_SS)|(1<<DD_MOSI)|(1<<DD_SCK); //设置ss,mosi,sck引脚下
- SPCR = (1<<SPE)|(1<<SPR0)|(1<<MSTR); //enable SPI, mast, fosc/16
- }
- unsigned char SPI_MasterTransmit(char data)
- {
- SPDR = data;
- while(!(SPSR&(1<<SPIF))); //等行发送完
- return SPDR;
- }
- int main()
- {
- unsigned char data;
- unsigned char i=0x88;
- SPI_MasterInit();
- while(1)
- {
-
-
- data=SPI_MasterTransmit(i);
- }
- }
从机程序：
- /*
- * GccApplication6.c
- *
- * Created: 2014-9-29 20:02:33
- * Author: Administrator
- */
- #include <avr/io.h>
- #define DD_MISO 6
- void SPI_SlaveInit(void)
- {
- DDRB=(1<<DD_MISO);
- SPCR=(1<<SPE);
- }
- char SPI_SlaveReceive(void)
- {
- while(!(SPSR&(1<<SPIF)));
- return SPDR;
-
- }
- int main(void)
- {
- DDRC = 0xFF;
- SPI_SlaveInit();
- while(1)
- {
- PORTC=SPI_SlaveReceive();
- }
-
-
- }
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楼主
