藍橋杯 讀溫度

讀溫度使用的是ds18b20晶元，該晶元通過單匯流排one-wire協議和微控制器進行通訊，在比賽的時候會提供onewire.c和onewire.h兩個檔案。完整**會放在最後，下面講解如何編寫讀取溫度的程式。

跳過rom操作指令

啟動溫度轉化

開始讀取暫存器的資料

新增到onewire.c中

unsigned

char
duwendu()

unsigned

char
duwendu()
;

實驗晶元：stc15f2k60s2

實驗現象：獲取當前環境溫度，顯示在數碼管上

**如下

#include

"onewire.h"
//單匯流排延時函式
void
delay_onewire
(unsigned
int t)
//ds18b20晶元初始化
bit init_ds18b20
(void
)//通過單匯流排向ds18b20寫乙個位元組
void
write_ds18b20
(unsigned
char dat)
delay_onewire(5
);}//從ds18b20讀取乙個位元組
unsigned
char
read_ds18b20
(void
)delay_onewire(5
);}return dat;
}//讀溫度
unsigned
char
duwendu()

#ifndef _onewire_h

#define _onewire_h
#include
"stc15f2k60s2.h"
#define ow_skip_rom 0xcc
#define ds18b20_convert 0x44
#define ds18b20_read 0xbe
//ic引腳定義
sbit dq = p1^4;
//函式宣告
void
delay_onewire
(unsigned
int t)
;void
write_ds18b20
(unsigned
char dat)
;bit init_ds18b20
(void);
unsigned
char
read_ds18b20
(void);
unsigned
char
duwendu()
;//新增
#endif

# include

"stc15f2k60s2.h"
# include
"onewire.h"
#define uchar unsigned char
#define uint unsigned int
uchar duan=
; uchar dispbuff[8]
; uint temp;
bit temp_flag;
void
close_buzz()
void
display()
void
show_temp()
void
timer0init
(void
)//2毫秒@12.000mhz
void
timer_display
() interrupt 1
}void
main()
show_temp();}}

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