Texas Instruments TLV1562 manual Software Overview

Software Overview

;.setsect ”.vectors”, 0x00180,0 ; sections of code

;	.setsect	”.text”,	0x00200,0	;	these assembler directives specify
;	.setsect	”.data”,	0x01800,1	;	the absolute addresses of different

;.setsect ”.variabl”, 0x01800,1 ; sections of code

.sect ”.vectors”

.copy ”vectors.asm”

.sect ”.data”
.copy ”constant.asm”
AD_DP		.usect ”.variabl”, 0				;
ACT_CHANNEL		.usect ”.variabl”, 1				; jump address to init. new channel
ADWORD		.usect ”.variabl”, 1				; send–bytes to the ADC
ADCOUNT		.usect ”.variabl”, 1				; counter for one channel
ADMEM		.usect ”.variabl”, 1				; points to act. memory save location
CH_NO		.usect ”.variabl”, 1				; channel number 1 to 4
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
ADSAMPLE		.usect ”.variabl”,1				; last read sample
* 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
		.def		_TLV1562
.sect ”.text”
START:
INITIALIZATION:
_TLV1562:
data(ADMEM) = *SP(1)					; read saving location
data(ADCOUNT) = *SP(2)					; read number of samples
push(AR6)					; save AR6
push(AR7)					; save AR7
CPL	= #0				; do DP pointer addressing
* sign extension mode, ini Stack
SXM	= 0				; no sign extension mode
* reset pending IRQs
IFR	= #1			; reset any old interrupt on pin INT0

Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP 87