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带掉电记忆功能的LED时钟代码分享！如何实现LED时钟的掉电记忆呢，我们采用的是ATMEL的芯片，并配以DS1302结构来实现精准的时间走时与掉电记忆功能。下面是电路图和实物图片，如下：
具体实现代码如下：
#include
#include
#include
#include
const Pin pPinRST=PIN_DS1302_RST_OUT;
const Pin pPinIOIN=PIN_DS1302_IO_IN;
const Pin pPinIOOUT=PIN_DS1302_IO_OUT;
const Pin pPinSCK=PIN_DS1302_SCK_OUT;
void ds1302_write_byte(unsigned char addr, unsigned char data) {
unsigned char i=0;
RST_SET;//启动DS1302总线
delay_ms(10);
//写入目标地址：addr
IO_OUT;
addr = addr & 0xFE;//最低位置零
for (i = 0; i < 8; i ++) {
if (addr & 0x01) {
IO_SET;
}
else {
IO_CLR;
}
delay_ms(10);
SCK_SET;
delay_ms(10);
SCK_CLR;
delay_ms(10);
addr = addr >> 1;
}
//写入数据:
IO_OUT;
for (i = 0; i < 8; i ++) {
if (data & 0x01) {
IO_SET;
}
else {
IO_CLR;
}
delay_ms(10);
SCK_SET;
delay_ms(10);
SCK_CLR;
delay_ms(10);
data = data >> 1;
}
RST_CLR;//停止DS1302总线
}
unsigned char ds1302_read_byte(unsigned char addr){
unsigned char i=0;
unsigned char tp=0;
RST_SET;//启动DS1302总线
delay_ms(10);
//写入目标地址：addr
IO_OUT;
addr = addr | 0x01;//最低位置高
for (i = 0; i < 8; i ++) {
if (addr & 0x01) {
IO_SET;
}
else {
IO_CLR;
}
delay_ms(10);
SCK_SET;
delay_ms(10);
SCK_CLR;
delay_ms(10);
addr = addr >> 1;
}
//输出数据：tp
IO_IN;
delay_ms(10);
for (i = 0; i < 8; i ++) {
tp = tp >> 1;
if (IO_R) {
tp |= 0x80;
}
else {
tp &= 0x7F;
}
delay_ms(10);
SCK_SET;
delay_ms(10);
SCK_CLR;
delay_ms(10);
}
RST_CLR;//停止DS1302总线
return tp;
}
void ds1302_write_time(void){
ds1302_write_byte(ds1302_control_add,0x00); //关闭写保护
ds1302_write_byte(ds1302_sec_add,0x80); //暂停
ds1302_write_byte(ds1302_charger_add,0xa5); //涓流充电
ds1302_write_byte(ds1302_year_add,time_buf[1]); //年
ds1302_write_byte(ds1302_month_add,time_buf[2]); //月
ds1302_write_byte(ds1302_date_add,time_buf[3]); //日
ds1302_write_byte(ds1302_hr_add,time_buf[4]); //时
ds1302_write_byte(ds1302_min_add,time_buf[5]); //分
ds1302_write_byte(ds1302_sec_add,time_buf[6]); //秒
ds1302_write_byte(ds1302_day_add,time_buf[7]); //周
ds1302_write_byte(0xDD,0xAA); //标记
ds1302_write_byte(ds1302_control_add,0x80); //打开写保护
}
void ds1302_read_time(void){
time_buf[1]=ds1302_read_byte(ds1302_year_add); //年
time_buf[2]=ds1302_read_byte(ds1302_month_add); //月
time_buf[3]=ds1302_read_byte(ds1302_date_add); //日
time_buf[4]=ds1302_read_byte(ds1302_hr_add); //时
time_buf[5]=ds1302_read_byte(ds1302_min_add); //分
time_buf[6]=ds1302_read_byte(ds1302_sec_add)&0x7F; //秒
time_buf[7]=ds1302_read_byte(ds1302_day_add); //周
}