ATMEGA16--ds1302-show.rar_show

//*********** DS1302 驱动程序 //接口定义 // PA5: RST // PA6: I/O // PA7: CLK #include<iom16v.h> static unsigned char clock[8]={0,0,12,1,12,0,8,0}; //秒、分、时、日、月、星期、年、空位 void write_byte(unsigned char word) { unsigned char i; DDRA|=(1<<6); for(i=0; i<8;i++) { if(word & 0x01) PORTA |=(1<<6); else PORTA &=~(1<<6); word = word >> 1; PORTA|=(1<<7); PORTA&=~(1<<7); } } unsigned char read_byte() { unsigned char i,byte=0; DDRA &=~(1<<6); for(i=0; i<8; i++) { if(PINA&(1<<6)) //读数据,从低位开始 byte|=(1<<i); else byte&=~(1<<i); PORTA |=(1<<7); PORTA &=~(1<<7); } return(byte); } void write_1302(unsigned char addr, unsigned char data) { PORTA&=~(1<<5); // RST to L PORTA&=~(1<<7); // CLK to L PORTA|=(1<<5); // RST to H write_byte(addr); /* 地址，命令 */ write_byte(data); /* 写1Byte数据*/ PORTA|=(1<<7); //CLK to H PORTA&=~(1<<5); //RST to L } unsigned char read_1302(unsigned char addr) { unsigned char word; PORTA&=~(1<<5); // RST to L PORTA&=~(1<<7); // CLK to L PORTA|=(1<<5); // RST to H write_byte(addr); /* 地址，命令 */ word = read_byte(); /* 读1Byte数据 */ PORTA|=(1<<7); //CLK to H PORTA|=(1<<7); PORTA&=~(1<<5); //RST to L return(word); } void init_1302() { unsigned char i; write_1302(0x8E,0x00); // 允许写入 write_1302(0x09,0xA9); // 允许充电, 双二极管, 8K 电阻 write_byte(0xBE); for(i=0;i<8;i++) { write_byte(clock[i]); } }