Texas Instruments TLV1562 manual Software Overview

Software Overview

CR0_SEND	.usect ”.variabl”, 1				; the last value, sent to register CR0
CR1_SEND	.usect ”.variabl”, 1				; the last value, sent to register CR1
CR_PROBLEM .usect ”.variabl”, 1					; problem with initialization of this mode
					when repeated (reset)
ZERO	.usect ”.variabl”, 1				; the value zero to send
TEMP	.usect ”.variabl”, 1				; temporary variable
isr_save	.usect ”.variabl”, 1				; memory location to save AR7 during
					; interrupts
CH1_ADSAMPLE		.usect ”.variabl”,1			; last read sample of channel 1
CH2_ADSAMPLE		.usect ”.variabl”,1			; last read sample of channel 2
* Address Decoder constants:
ADC	.set	00002h			; activate A0 when TLV1562 is choosen
CSTART	.set 00001h				; activate A1 when CSTART is choosen
DAC1	.set	00003h			; activate A2 when DAC1 is choosen
DEACTIVE	.set		00000h		; deactivate the address lines A0, A1 and A2
* set timing mode (use od IRQ, or timer)
POLLING_DRV		.set	00001h		; software polls the INT0 pin to wait, until
					conversion is done
INT0_DRIVEN		.set	00000h		; software uses Interrupt INT0 to wait for end of
					conversion
NO_INT0_SIG		.set	00000h		; INT0 signal not in use, timing solution
SAVE_INTO_MEMORY.set 00001h					; store the samples into DSP memory
SEND_OUT_SERIAL .set				00000h	; store the last sample allways into serial buffer memory
SEND_OUT_PARALLEL.set 00001h					; store the last sample allways into DAC1
R10BIT_RESOLUT .set				00001h	; use maximum resolution of 10 bit
R8BIT_RESOLUT .set 00000h					; use 8 Bit resolution
R4BIT_RESOLUT .set 00000h					; use fastest mode (4 Bit resolution)
INTERNAL_CLOCK .set				00001h	; use the internal clock of the ADC
EXTERNAL_CLOCK .set				00000h	; use the external clock of the ADC
AUTO_PWDN_ENABLE.set 00000h					; ADC goes into power reduced state after conversion
DIFF_INPUT_MODE .set				00000h	; use differential mode instead of single ended inputs
IME_CALIBRATION .set				00000h	; do an Internal Midscale Error Calibration
SME_CALIBRATION .set				00000h	; do a System Midscale Error Calibration
.sect ”.text”

_MAIN:

START:

INITIALIZATION:

* disable IRQ, sign extension mode, ini Stack

Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP 67