发布时间 : 星期四 文章基于51单片机的DS1302+LCD12864+DS18B20小综合更新完毕开始阅读
delay_us(4); }
return temp; }
uchar DS18B20_Init(void) {
uchar init_18B20_flag; DQ=1;
delay_us(8); DQ=0;
delay_us(80); DQ=1;
delay_us(10); init_18B20_flag=DQ; delay_us(5);
//while(init_fail);
return init_18B20_flag; }
uint read_temperature(void) {
uchar a; uint b,t;
DS18B20_Init();
DS18B20_write_byte(0xcc); DS18B20_write_byte(0x44); delay_us(200);
DS18B20_Init();
DS18B20_write_byte(0xcc); DS18B20_write_byte(0xBE);
a=DS18B20_read_byte(); b=DS18B20_read_byte();
b<<=8; t=a+b; return t; }
void write_temp(uchar temp_h) {
uchar i;
write_symbol(sbl_addr_pos,symbol);
write_command(third_line+Tep_addr_pos); delay_ms(5);
write_data(0x30+temp_h/10); delay_ms(5);
write_data(0x30+temp_h); delay_ms(5);
write_command(third_line+Tmp_addr_pos); delay_ms(5);
for(i=14;i<16;i++){
write_data(str_wek[i]); } }
void write_symbol(uchar addr,uchar symbol) {
write_command(third_line+addr); delay_ms(5);
write_data(symbol); }
void display_18B20_err(void) {
uchar i;
uchar str[]=\错误\
write_command(third_line+sbl_addr_pos); for(i=0;i<6;i++){
write_data(str[i]); delay_ms(5); } }