mma7455角度传感器基于SPI协议的测试程序

//#define spi_cs PA0 //#define spi_sda PA1 //#define spi_sck PA3 //#define spi_res PA4 void lcd_start() //初始化 { PORTA|=(1<<0)|(1<<3); PORTA&=~(1<<4); _delay_ms(1); PORTA|=(1<<4); _delay_ms(1); } void lcd_send(unsigned char data) //发送数据或指令 { unsigned char i; for(i=0;i<8;i++) { PORTA&=~(1<<3); if(data&0x80) PORTA|=(1<<1); else PORTA&=~(1<<1); PORTA|=(1<<3); data=data<<1; } } void clean() //清屏 { PORTA&=~(1<<0); lcd_send(0x80); PORTA|=(1<<0); } void light(unsigned char lightdu) //亮度设置 { PORTA&=~(1<<0); lcd_send(0x8a); lcd_send(lightdu); PORTA|=(1<<0); } void shezhi(unsigned char cod,unsigned char liang) //设置函数 { PORTA&=~(1<<0); lcd_send(cod); lcd_send(liang); PORTA|=(1<<0); } void fasong_2(unsigned char cmd,unsigned char x,unsigned char y) //发送需要两位数据指令的函数 { PORTA&=~(1<<0); lcd_send(cmd); lcd_send(x); lcd_send(y); PORTA|=(1<<0); } void fasong_3(unsigned char cmd,unsigned char x,unsigned char y,unsigned char neirong) //发送需要三位数据指令的函数 { PORTA&=~(1<<0); lcd_send(cmd); lcd_send(x); lcd_send(y); lcd_send(neirong); PORTA|=(1<<0); } void fasong_4(unsigned char cmd,unsigned char x,unsigned char y,unsigned char gao,unsigned char di) //发送需要四位数据指令的函数 { PORTA&=~(1<<0); lcd_send(cmd); lcd_send(x); lcd_send(y); lcd_send(gao); lcd_send(di); PORTA|=(1<<0); } void lcd_128() { DDRA|=(1<<0)|(1<<1)|(1<<2)|(1<<3);//|(1<<4) lcd_start(); clean(); light(127); shezhi(0x81,0x01); //设置ASCII输入 shezhi(0x82,0x01); // 设置汉字输入 shezhi(0x83,0x01); //图形输入; }