ds18b20测量温度并显示到lcd1602上的汇编程序

以下是使用ds18b20测量温度并将其显示到lcd1602上的汇编程序：

;-----------------------DS18B20温度传感器-----------------------
;DS18B20温度传感器引脚定义
DS18B20_PORT EQU P3
DS18B20_PIN EQU 0

;LCD1602引脚定义
LCD1602_DATA_PORT EQU P0
LCD1602_RS EQU P2.0
LCD1602_RW EQU P2.1
LCD1602_EN EQU P2.2

;定义常量
DELAY_TIME EQU 500

;初始化DS18B20
INIT_DS18B20 PROC
    MOV A, #0
    MOV DS18B20_PORT, A
    MOV A, #1
    MOV DPTR, #DELAY_TIME
    CALL DELAY
    MOV A, #1
    MOV DS18B20_PORT, A
    MOV DPTR, #DELAY_TIME
    CALL DELAY
    RET
INIT_DS18B20 ENDP

;向DS18B20发送指令
SEND_DS18B20 PROC
    MOV A, #0
    MOV DS18B20_PORT, A
    MOV A, #1
    MOV DPTR, #DELAY_TIME
    CALL DELAY
    MOV A, #1
    MOV DS18B20_PORT, A
    MOV DPTR, #DELAY_TIME
    CALL DELAY
    RET
SEND_DS18B20 ENDP

;读取DS18B20的响应
READ_DS18B20 PROC
    MOV A, DS18B20_PORT
    ANL A, #01H
    RET
READ_DS18B20 ENDP

;发送一个字节的数据
SEND_BYTE PROC BYTE_VAL
    MOV R7, #08H
SEND_BYTE_LOOP:
    MOV A, BYTE_VAL
    RLC A
    MOV DS18B20_PORT.0, C
    MOV DPTR, #DELAY_TIME
    CALL DELAY
    MOV DS18B20_PORT.0, 1
    DJNZ R7, SEND_BYTE_LOOP
    RET
SEND_BYTE ENDP

;读取一个字节的数据
READ_BYTE PROC
    MOV R7, #08H
    MOV A, #0
READ_BYTE_LOOP:
    RLC A
    MOV DS18B20_PORT.0, 1
    MOV DPTR, #DELAY_TIME
    CALL DELAY
    MOV C, DS18B20_PORT.0
    JNC READ_BYTE_SKIP
    SETB A.0
READ_BYTE_SKIP:
    MOV DS18B20_PORT.0, 0
    DJNZ R7, READ_BYTE_LOOP
    RET
READ_BYTE ENDP

;读取温度
READ_TEMPERATURE PROC
    CALL INIT_DS18B20
    CALL SEND_DS18B20
    CALL SEND_BYTE, #0CCH
    CALL SEND_BYTE, #044H
    CALL INIT_DS18B20
    CALL SEND_DS18B20
    CALL SEND_BYTE, #0CCH
    CALL SEND_BYTE, #BEH
    CALL READ_BYTE
    MOV R6, A
    CALL READ_BYTE
    MOV R5, A
    MOV A, R5
    MOV B, R6
    CPL A
    CPL B
    JZ READ_TEMPERATURE_SKIP
    MOV A, #0FFH
READ_TEMPERATURE_SKIP:
    RET
READ_TEMPERATURE ENDP

;显示温度到LCD1602
DISPLAY_TEMPERATURE PROC TEMPERATURE
    MOV A, TEMPERATURE
    ACALL CONVERT_TEMPERATURE
    MOV LCD1602_RS, #0
    MOV LCD1602_RW, #0
    MOV LCD1602_DATA_PORT, #38H
    MOV LCD1602_EN, #1
    MOV DPTR, #DELAY_TIME
    CALL DELAY
    MOV LCD1602_EN, #0
    MOV LCD1602_DATA_PORT, #0FH
    MOV LCD1602_EN, #1
    MOV DPTR, #DELAY_TIME
    CALL DELAY
    MOV LCD1602_EN, #0
    MOV LCD1602_RS, #1
    MOV LCD1602_RW, #0
    MOV A, #80H
    ADD A, #0
    MOV LCD1602_DATA_PORT, A
    MOV LCD1602_EN, #1
    MOV DPTR, #DELAY_TIME
    CALL DELAY
    MOV LCD1602_EN, #0
    MOV A, TEMPERATURE_HIGH
    ACALL CONVERT_TEMPERATURE
    MOV LCD1602_DATA_PORT, A
    MOV LCD1602_EN, #1
    MOV DPTR, #DELAY_TIME
    CALL DELAY
    MOV LCD1602_EN, #0
    MOV A, TEMPERATURE_LOW
    ACALL CONVERT_TEMPERATURE
    MOV LCD1602_DATA_PORT, A
    MOV LCD1602_EN, #1
    MOV DPTR, #DELAY_TIME
    CALL DELAY
    MOV LCD1602_EN, #0
    RET
DISPLAY_TEMPERATURE ENDP

;转换温度为可显示的字符
CONVERT_TEMPERATURE PROC
    MOV R0, A
    MOV R1, #10H
    DIV AB, R1
    MOV TEMPERATURE_HIGH, A
    MOV A, B
    MOV R1, #10
    DIV AB, R1
    ADD A, #30H
    MOV TEMPERATURE_LOW, A
    RET
CONVERT_TEMPERATURE ENDP

;延时函数
DELAY PROC
    MOV R2, #0FFH
DELAY_LOOP:
    DJNZ R2, $
    MOV R3, #0FFH
DELAY_LOOP_1:
    DJNZ R3, DELAY_LOOP_1
    DJNZ DPTR, DELAY_LOOP
    RET
DELAY ENDP

;主程序
MAIN:
    MOV P0, #0
    MOV P2, #0
    CALL DISPLAY_TEMPERATURE, READ_TEMPERATURE
    SJMP MAIN

需要注意的是，以上程序仅供参考，实际使用中可能需要进行适当的修改和调试。