Cirrus-logic AN89 Manual do Utilizador descarregar pdf (Página 6)

AN89

6 AN89Rev2

**************************************************************************************

* Program Code

**************************************************************************************

ORG $0100

**************************************************************************************

* Routine - Main

* Input - none

* Output - none

* This is the entry point to the program.

**************************************************************************************

MAIN EQU * ; Start from Reset Vector

******** Initialize System and Perform SELF OFFSET Calibration

JSR initialize ; Initialize the system

JSR calibrate ; Calibrate the ADC Offset

******** Write to the GAIN Register

LDA #$82 ; Prepare COMMANDBYTE

STA COMMANDBYTE

LDA #$80 ; Prepare HIGHBYTE

STA HIGHBYTE

CLR MIDBYTE ; Prepare MIDBYTE

CLR LOWBYTE ; Prepare LOWBYTE

JSR write_register ; Write to Gain Register

******** Read from the GAIN Register

LDA #$92 ; Prepare COMMANDBYTE

STA COMMANDBYTE

JSR read_register ; Read the Gain Register

******** Perform Single Conversions

LOOP JSR convert ; Convert Analog input

JMP LOOP ; Repeat Loop

******** End MAIN

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Cirrus-logic AN89 Manual do Utilizador Página 6