84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
/* # DS1302代码片段说明
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1. 本文件夹中提供的驱动代码供参赛选手完成程序设计参考。
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2.
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参赛选手可以自行编写相关代码或以该代码为基础，根据所选单片机类型、运行速度和试题
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中对单片机时钟频率的要求，进行代码调试和修改。
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*/
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#include "ds1302.h"
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#include "REG52.H"
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#include "intrins.h"
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sbit SCK = P1 ^ 7;
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sbit SDA = P2 ^ 3;
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sbit RST = P1 ^ 3;
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//
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void Write_Ds1302(unsigned char temp) {
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unsigned char i;
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for (i = 0; i < 8; i++) {
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SCK = 0;
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SDA = temp & 0x01;
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temp >>= 1;
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SCK = 1;
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}
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}
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//
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void Write_Ds1302_Byte(unsigned char address, unsigned char dat) {
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RST = 0;
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_nop_();
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SCK = 0;
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_nop_();
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RST = 1;
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_nop_();
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Write_Ds1302(address);
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Write_Ds1302(dat);
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RST = 0;
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}
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//
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unsigned char Read_Ds1302_Byte(unsigned char address) {
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unsigned char i, temp = 0x00;
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RST = 0;
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_nop_();
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SCK = 0;
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_nop_();
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RST = 1;
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_nop_();
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Write_Ds1302(address);
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for (i = 0; i < 8; i++) {
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SCK = 0;
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temp >>= 1;
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if (SDA) temp |= 0x80;
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SCK = 1;
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}
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RST = 0;
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_nop_();
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SCK = 0;
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_nop_();
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SCK = 1;
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_nop_();
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SDA = 0;
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_nop_();
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SDA = 1;
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_nop_();
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return (temp);
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}
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void Set_Rtc(unsigned char *ucRtc) {
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unsigned char i;
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unsigned char temp1;
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Write_Ds1302_Byte(0x8e, 0x00); // 关闭写保护
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for (i = 0; i < 3; i++) {
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temp1 = (ucRtc[i] / 10 << 4) | (ucRtc[i] % 10);
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Write_Ds1302_Byte(0x84 - 2 * i, temp1);
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}
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Write_Ds1302_Byte(0x8e, 0x80); // 打开写保护
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}
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void Read_Rtc(unsigned char *ucRtc) {
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unsigned char i;
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unsigned char temp2;
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for (i = 0; i < 3; i++) {
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temp2 = Read_Ds1302_Byte(0x85 - 2 * i);
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ucRtc[i] = temp2 / 16 * 10 + temp2 % 16;
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}
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} |