Texas Instruments TMS320F20x/F24x DSP manual Preliminary, Assembly Source for Algorithms, A-21

PRELIMINARY

Assembly Source for Algorithms

*	BASE_3	Used for buffer/row start addr	*
*	BASE_4	Used for destination end addr	*
*	BASE_5	Used for byte mask	*

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

GPGMJ: SPLK	#0,IMR		;MASK ALL INTERRUPTS
SETC	INTM		;GLOBALLY MASK ALL INTERRUPTS
SPLK	#0,ERROR		;Initialize error flag (no error).
LACL	PRG_paddr		;Get destination start address.
SACL	FL_ADRS		;Save as current address.
ADD	PRG_length		;Determine destination end addr.
SUB	#1		;
SACL	BASE_4		;Save destination end addr.
LACL	PRG_paddr		;Get destination start addr.
LAR	AR3,PRG_bufaddr			;Get buffer start address.
********Begin a new row.*
NEWROW
SACL	BASE_1			;Save row start address.
SAR	AR3,BASE_3			;Save buffer/row start address.
LAR	AR1,#0			;Init pulse count to zero.
SPLK	#31,BASE_2			;Init row length±1 to 31.
AND	#001Fh			;Is start addr on row boundary?
CC	ADJ_ROW,NEQ			;If not then adjust row length.
LACL	BASE_1			;Get row start address.
OR	#001Fh			;Get row end address.
SUB	BASE_4			;Is end address on row boundary?
CC	ADJ_ROW,GT			;If not then adjust row length.
********Same row, next pulse.*
SAMEROW SPLK #1,BASE_0				;Set row done flag = 1(True).
LACL		BASE_1		;Get row start address.
SACL		FL_ADRS		;Save as current address.
LAR		AR3,BASE_3		;Get buffer/row start addr.
LAR		AR2,BASE_2		;Init row index.

**	Repeat the following code 32 times or until end of row.*
LOBYTE			;********First, do low byte.*
	CALL	SET_MODULE,AR4		;Determine which flash module.
	SPLK		#0FFh,BASE_5	;Set lo±byte mask.
	CALL		PRG_BYTE	;Check/Program lo±byte.
	SPLK		#0FF00h,BASE_5	;Set hi±byte mask.
	CALL	PRG_BYTE		;Check/Program hi±byte.
NEXTWORD			;********Next word in row.
	LACL		FL_ADRS	;Load address for next word.
	ADD		#1	;Increment address.
	SACL		FL_ADRS	;Save as current address.
	MAR		*,AR3	;ARP ±> buffer addr index.
	MAR		*+,AR2	;Inc, and ARP ±> row index.
	BANZ		LOBYTE	;Do next word,and dec AR2.
**	Reached end of row. Check if row done. *
	BIT		BASE_0,15	;Get row_done flag.
	BCND		ROW_DONE,TC	;If 1 then row is done.
	MAR		*,AR1	;Else, row is not done, so
	MAR		*+	;inc row pulse count.
	LAR		AR0,#MAX_PGM	;Check if passed allowable max.
	CMPR		2	;If AR1>MAX_PGM then

PRELIMINARY Assembly Source Listings and Program Examples A-21