Cirrus Logic AN89 - Manual (Page 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