Software Overview
.if (EXTERNAL_CLOCK) |
|
@CR0_SEND ^= #CLK_INTERNAL | ; clear CLK_INTERNAL bit if one |
@CR0_SEND = #CLK_EXTERNAL | ; set CLK_EXTERNAL mode |
.endif |
|
.if (AUTO_PWDN_ENABLE) |
|
@CR1_SEND ^= #NO_AUTO_PWDN | ; clear NO_AUTO_PWDN bit if one |
@CR1_SEND = #AUTO_PWDN | ; set AUTO_PWDN mode |
.endif |
|
.if (DIFF_INPUT_MODE) |
|
@CR0_SEND ^= #SINGLE_END | ; clear single ended input bit if one |
@CR0_SEND = #DIFFERENTIAL | ; set differential input mode |
.endif |
|
****************************************************************************
*Calibration:
*do a calibration of the input if choosen (the location of this instruction
*is only for an EVM test, in practice, the calibration procedure should
*be executed when the inputs are shorted to the correct voltage and after
*calibration, the analog signal is to apply before doing any further signal
*conversion)
*the calibration implementation is more or less inserted as an example
****************************************************************************
.if (IME_CALIBRATION)
call CALIBRAT_INTERNAL_MID_SCALE
.endif
.if (SME_CALIBRATION)
call CALIBRAT_SYSTEM_MID_SCALE
.endif
****************************
*ADC_INI:
*set ADC register CR0/CR1
****************************
ADC_INI:
*write CR1 (to reset old CSTART mode initialization, because otherwise, the ADC never sets
*back its INT pin to show a sample is available:
@CR_PROBLEM = #(SW_PWDNNO_AUTO_PWDNNO_2COMPLEMENTNO_DEBUGRES_10_BITRD_CONV_START);
port(ADC) = @CR_PROBLEM | ; Address decoder sets CS low, |
| ; WR– low and send CR_PROBLEM value to the ADC |
NOP | ; wait for tW(CSH)=50ns |
* write CR1:
port(ADC) = @CR1_SEND ; Address decoder sets CS low,
; WR– low and send CR1 value to the ADC
