Texas Instruments TLV1562 manual Software Overview

Software Overview

isr_save	.usect ”.variabl”,		1	; memory location to save AR7 during
				; interrupts
ADSAMPLE	.usect ”.variabl”, 1			; last read sample from the ADC
* Address Decoder constants:
ADC	.set	00002h	; activate A0 when TLV1562 is choosen
RD_CALIBRATION	.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
SAVE_INTO_MEMORY .set		00000h	; 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
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

	INTM	= 1	; disable IRQ
	SXM	= 0	; no sign extension mode
;	SP	= #0280h	; initialize Stack pointer
* initialize waitstates:
	DP	= #00000h	; point to page zero
	@SWWSR = #01000h		; one I/O wait states

*copy interrupt routine, which are not critical for the EVM to the IRQ table location:

*this is required for the DSKplus kit but has to be changed on other platforms

DP	= #1	; point to page 1 (IRQ vector table)
AR7	= #00200h
repeat(#3h)
data(0084h) = *AR7+		; copy the NMI vector
AR7	= #00240h
repeat(#35)
data(00C0h) = *AR7+
		; copy INT0, INT1,...

* clear all memory locations of the sampling table (table, where the samples will be stored)

DP	= #AD_DP	;
@TEMP	= #00000h	;
repeat(#num_data_A–1)

Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP 75