Texas Instruments TLV1562 manual Software Overview, endif, if SMECALIBRATION

			Software Overview
nop		; wait for 34 cycles until conversion has been finished
@TEMP = port(ADC)		; read the sample but don’t care about the content
IFR	= #1	; reset any old interrupt on pin INT0

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

*set back ADC register CR0/CR1

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

*write CR1 (to reset old CSTART mode initialization, because otherwise, the ADC never resets

*the 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
port(DEACTIVE) = @ZERO	; deselect ADC (CS high)
NOP	; wait for tW(CSH)=50ns
* write CR0
port(ADC) = @CR0_SEND	; send CR0 value to the ADC
port(DEACTIVE) = @ZERO	; deselect ADC (CS high)
NOP	; wait for tW(CSH)=50ns
return	; return from call
.endif

.if (SME_CALIBRATION)

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

*CALIBRAT_SYSTEM_MID_SCALE

*performs an internal calibration of the ADC to offset for the device midscale

*error and input offset

*basic idea: do a error calibration in mono interrupt driven mode using CSTART

*for conversion, but use the channel & single/differential input information already

*set–up in the CR0_send register from

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

CALIBRAT_SYSTEM_MID_SCALE:

DP	= #AD_DP	; initialize data pointer
* clear calibration related bits in CR0:
@CR0_SEND &= #(NO_CALIB_OP^0FFFFh)		; clear bit for no calibration use
@CR0_SEND &= #(CALIB_OP^0FFFFh)		; clear bit for no calibration use

* initialize the send values to setup the two		programmable registers of the ADC to calibrate
data(CR_CALIBRA) = @CR0_SEND	;	load help register with CR0 content

Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP 55