51和pic單片機(jī)都能用的spi bus程序

/*pic18->mcu_pic_18  avr->mcu_avr  /*******************************/#define _CPOL     0 //模式配置#define _CPHA     0 //模式配置/*******************************/#ifdef mcu_51#include "REG51.h"#define SCK_IO(x)  (0?(P1&=0XFE):(P1|=0X01))//1->輸出  0->輸入#define MOSI_IO(x) (0?(P1&=0XFD):(P1|=0X02))#define MISO_IO(x) (0?(P1&=0XFB):(P1|=0X04))#define SSEL_IO(x) (0?(P1&=0XF7):(P1|=0X08))#define SCK_D(x)  (x?(P1|=0X01):(P1&=0XFE))#define MOSI_D(x) (x?(P1|=0X02):(P1&=0XFD))#define SSEL_D(X) (X?(P1|=0X08):(P1&=0XF7))#define MISO_I()  (P1&0X04)  #endif#ifdef mcu_pic_18#include "PIC18.h"#define SCK_IO(x)  (x?(TRISA&=0XFE):(TRISA|=0X01))//1->輸出  0->輸入#define MOSI_IO(x) (x?(TRISA&=0XFD):(TRISA|=0X02))#define MISO_IO(x) (x?(TRISA&=0XFB):(TRISA|=0X04))#define SSEL_IO(x) (x?(TRISA&=0XF7):(TRISA|=0X08))#define SCK_D(x)  (x?(LATA|=0X01):(LATA&=0XFE))#define MOSI_D(x) (x?(LATA|=0X02):(LATA&=0XFD))#define SSEL_D(X) (X?(LATA|=0X08):(LATA&=0XF7))#define MISO_I()  (PORTA&0X04)  #endif#ifdef mcu_avr#include "iom8535v.h"#define SCK_IO(x)  (x?(DDRA|=0X01):(DDRA&=0XFE))//1->輸出  0->輸入#define MOSI_IO(x) (x?(DDRA|=0X02):(DDRA&=0XFD))#define MISO_IO(x) (x?(DDRA|=0X04):(DDRA&=0XFB))#define SSEL_IO(x) (x?(DDRA|=0X08):(DDRA&=0XF7))#define SCK_D(x)  (x?(PORTA|=0X01):(PORTA&=0XFE))#define MOSI_D(x) (x?(PORTA|=0X02):(PORTA&=0XFD))#define SSEL_D(X) (X?(PORTA|=0X08):(PORTA&=0XF7))#define MISO_I()  (PINA&0X04)  #endifextern void SPI_Init(void);extern unsigned char SPI_Send_Dat(unsigned char dat);extern void delay(unsigned char ms );void delay(unsigned char ms ){unsigned char m;while(ms--)for(m=0;m<100;m++);}/************************************************端口方向配置  與輸出初始化************************************************/void SPI_Init(void){SCK_IO(1)   ;  MOSI_IO(1)  ; MISO_IO(0)  ;  SSEL_IO(1)  ;SSEL_D(1);MOSI_D(1);#if _CPOL==0SCK_D(0);#elseSCK_D(1);#endif}/**********************************************模式零           ***********************************************/#if _CPOL==0&&_CPHA==0          //MODE   0  0    unsigned char SPI_Send_Dat(unsigned char dat){//第一數(shù)據(jù)sck上升之前 其他下降沿  數(shù)據(jù)采樣 上升沿 unsigned char n,rx_dat;for(n=0;n<8;n++){SCK_D(0);//下降沿if(dat&0x80)MOSI_D(1);else MOSI_D(0);dat<<=1;SCK_D(1); //上升沿 rx_dat<<=1;if(MISO_I())rx_dat|=0x01;else rx_dat&=0xfe;}SCK_D(0);return rx_dat;}#endif/**********************************************模式二          ***********************************************/#if _CPOL==1&&_CPHA==0           //MODE   1  0unsigned char SPI_Send_Dat(unsigned char dat){//第一數(shù)據(jù)sck下降沿之前 其他上升沿  數(shù)據(jù)采樣 下降沿 unsigned char n,rx_dat;for(n=0;n<8;n++){SCK_D(1);if(dat&0x80)MOSI_D(1);else MOSI_D(0);dat<<=1;SCK_D(0);rx_dat<<=1;if(MISO_I())rx_dat|=0x01;else rx_dat&=0xfe;}SCK_D(1);return rx_dat;}#endif/*********************************************模式一       *********************************************/#if _CPOL==0&&_CPHA==1           //MODE  0  1unsigned char SPI_Send_Dat(unsigned char dat){//第一數(shù)據(jù)sck上升 其他上升沿  數(shù)據(jù)采樣 下降沿 unsigned char n,rx_dat;SCK_D(0);for(n=0;n<8;n++){SCK_D(1);if(dat&0x80)MOSI_D(1);else MOSI_D(0);dat<<=1;SCK_D(0);rx_dat<<=1;if(MISO_I())rx_dat|=0x01;else rx_dat&=0xfe;}return  rx_dat;}#endif //////////////////////////////////////////////////////////////////////////////////////////////////////////////#if _CPOL==1&&_CPHA==1            //MODE  1  1unsigned char SPI_Send_Dat(unsigned char dat){//第一數(shù)據(jù)下降沿  其他下降沿   數(shù)據(jù)采樣 上升沿 unsigned char n,rx_dat;SCK_D(1);for(n=0;n<8;n++){SCK_D(0);if(dat&0x80)MOSI_D(1);else MOSI_D(0);dat<<=1;SCK_D(1);rx_dat<<=1;if(MISO_I())rx_dat|=0x01;else rx_dat&=0xfe;}return rx_dat;}/**************************************************************************//*int main(void){//DDRB=0Xff;SPI_Init();while(1){SSEL_D(0);P2=SPI_Send_Dat(0xaa);SSEL_D(1);//delay(100);}return 0;} */