adc.asm

本程序是PIC单片机自带AD转换功能的使用例子

;=========================================================  
; A/D转换子程序，采样16次并取平均值
;
;---------------1次A/D转换子程序--------------------------
 ADCONV
  CALL INTADC
   CALL DELAY1
   BSF ADCON0,GO ;A/D START 
   ADCONV1
   BTFSS PIR1,ADIF
   GOTO ADCONV1
   MOVF ADRESH,W
   MOVWF ADH
   BANKSEL ADRESL
   MOVF ADRESL,W
  BANKSEL PORTC
   MOVWF ADL

   BCF PIR1,ADIF                    ；加一句清中断溢出标志即可
  RETURN

;------------------------16次求和--------------------------
 ADAVG
  MOVLW 10H
  MOVWF COUNT0
 ADAVG1  
  CALL ADCONV
  BCF STATUS,C
  MOVF ADL,0
  ADDWF TEMPL,1 
  MOVF ADH,0
  ADDWF TEMPH,1
   BTFSC STATUS,C ;DO WITH "C"
  CALL ADDONE 
 GO_ON
  DECFSZ COUNT0,1
  GOTO ADAVG1
  MOVLW 04H
  MOVWF RL
 GO1 
  BCF STATUS,0
  RRF TEMPL,1
  RRF TEMPH,1
  DECFSZ RL,1
  GOTO GO1
 
  RETURN
 ADDONE
  MOVLW 01H
  ADDWF TEMPH
  RETURN 

;-----------------------------------------------
 INTADC
  BANKSEL ADCON0
  MOVLW 0X41
  MOVWF ADCON0  BANKSEL ADCON1
  MOVLW 0X8E
  MOVWF ADCON1  BANKSEL ADCON0
  RETURN
;-----------------------------------------------