Texas Instruments TLV1562 Software Overview, if SENDOUTPARALLEL, endif if SAVEINTOMEMORY, SLAA040

Software Overview

DP = #AD_DP ;

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

*ADC_mono_con_Start:

*read samples and store them into memory

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

ADC_mono_con_Start:

repeat(#12)
NOP	; wait for t(SAMPLES) (450ns)
STEP6: @ADSAMPLE = port(ADC)	; read the new sample into the DSP

*IMPORTANT: fine–tune the counter number of the next repeat loop in order

*to achive maximum throughput related to the delay of the store instructions STEP7: repeat(#7)

NOP	; wait for t(CONV1) (about 800ns)
STEP8: call STORE	; store the last sample into the table
goto STEP6	; go back to receive next sample
**********************************
* STORE:
* saving the samples into memory
**********************************
STORE:

.if (SEND_OUT_PARALLEL)

* store sample	into the parallel buffer location		if chosen
port(DAC1)	= @ADSAMPLE	; update DAC	output

.endif

.if SAVE_INTO_MEMORY

* store new sample into DSP data memory

*AR7+ = data(@ADSAMPLE) ; write last sample into memory table

.endif

.if SEND_OUT_SERIAL

* store sample into the serial buffer location

DP	= #00000h	; point	to page zero
TC	= bitf(@SPC,#01000h)	; test,	is the XRDY Bit in SPC=1?
if (TC) goto SEND_SERIAL_END ; don’t			send something until XDR is empty

;this has been included because the serial DAC TLC5618A is not able to understand

;endless data–stream (the CS should not become high before end of sending

;the 16th bit)

DP = #AD_DP ; reset Data page pointer to variables

A= @ADSAMPLE<<2 ; leftshift of the sample for a 12-bit format

@ADSAMPLE = A;

@ADSAMPLE = #(TLC5618_LATCH_ATLC5618_FAST_MODETLC5618_POWER_UP) ; set the mode of the DAC

data(BDXR) = @ADSAMPLE ; send out the sample to the serial DAC SEND_SERIAL_END:

78SLAA040