STC12C5A60S2汇编(ADC查询方式)示例程序 -

STC12C5A60S2汇编(ADC查询方式)示例程序

本文引用地址: http://www.21ic.com/app/mcu/201806/761564.htm

;/*Declare SFR associated with the ADC */
ADC_CONTR EQU 0BCH ;ADC control register

ADC_RES EQU 0BDH ;ADC high 8-bit result register
ADC_LOW2 EQU 0BEH ;ADC low 2-bit result register
P1ASF EQU 09DH ;P1 secondary function control register

;/*Define ADC operation const for ADC_CONTR*/
ADC_POWER EQU 80H ;ADC power control bit
ADC_FLAG EQU 10H ;ADC complete flag
ADC_START EQU 08H ;ADC start control bit
ADC_SPEEDLL EQU 00H ;420 cLOCks
ADC_SPEEDL EQU 20H ;280 clocks
ADC_SPEEDH EQU 40H ;140 clocks
ADC_SPEEDHH EQU 60H ;70 clocks

;-----------------------------------------
ORG 0000H
LJMP MAIN
;-----------------------------------------
ORG 0100H
MAIN:
LCALL INIT_UART ;Init UART, use to show ADC result
LCALL INIT_ADC ;Init ADC sfr
;-------------------------------
NEXT:
MOV A,#0
LCALL SHOW_RESULT ;Show channel0 result
MOV A,#1
LCALL SHOW_RESULT ;Show channel1 result
MOV A,#2
LCALL SHOW_RESULT ;Show channel2 result
MOV A,#3
LCALL SHOW_RESULT ;Show channel3 result
MOV A,#4
LCALL SHOW_RESULT ;Show channel4 result
MOV A,#5
LCALL SHOW_RESULT ;Show channel5 result
MOV A,#6
LCALL SHOW_RESULT ;Show channel6 result
MOV A,#7
LCALL SHOW_RESULT ;Show channel7 result

SJMP NEXT

;/*----------------------------
;Send ADC result to UART
;Input: ACC(ADC channel NO.)
;Output:-
;----------------------------*/
SHOW_RESULT:
LCALL SEND_DATA ;Show Channel NO.
LCALL GET_ADC_RESULT ;Get high 8-bit ADC result
LCALL SEND_DATA ;Show result

;//if you want show 10-bit result, uncomment next 2 lines
; MOV A,ADC_LOW2 ;Get low 2-bit ADC result
; LCALL SEND_DATA ;Show result
RET

;/*----------------------------
;Read ADC conversion result
;Input: ACC (ADC channel NO.)
;Output:ACC (ADC result)
;----------------------------*/
GET_ADC_RESULT:
ORL A,#ADC_POWER | ADC_SPEEDLL | ADC_START
MOV ADC_CONTR,A ;StartA/Dconversion
NOP ;Must wait before inquiry
NOP
NOP
NOP
WAIT:
MOV A,ADC_CONTR ;Wait complete flag
JNB ACC.4,WAIT ;ADC_FLAG(ADC_CONTR.4)
ANL ADC_CONTR,#NOT ADC_FLAG ;Clear ADC_FLAG
MOV A,ADC_RES ;Return ADC result
RET

;/*----------------------------
;Initial ADC sfr
;----------------------------*/
INIT_ADC:
MOV P1ASF,#0FFH ;Open 8 channels ADC function
MOV ADC_RES,#0 ;Clear previous result
MOV ADC_CONTR,#ADC_POWER | ADC_SPEEDLL
MOV A,#2 ;ADC power-on and delay
LCALL DELAY
RET

;/*----------------------------
;Initial UART
;----------------------------*/
INIT_UART:
MOV SCON,#5AH ;8 bit data ,no parity bit
MOV TMOD,#20H ;T1 as 8-bit auto reload
MOV A,#-5 ;Set Uart baudrate -(18432000/12/32/9600)
MOV TH1,A ;Set T1 reload value
MOV TL1,A
SETB TR1 ;T1 start running
RET

;/*----------------------------
;Send one byte data to PC
;Input: ACC (UART data)
;Output:-
;----------------------------*/
SEND_DATA:
JNB TI,$ ;Wait for the previous data is sent
CLR TI ;Clear TI flag
MOV SBUF,A ;Send current data
RET

;/*----------------------------
;SOFtware delay function
;----------------------------*/
DELAY:
MOV R2,A
CLR A
MOV R0,A
MOV R1,A
DELAY1:
DJNZ R0,DELAY1
DJNZ R1,DELAY1
DJNZ R2,DELAY1
RET

END