Texas Instruments TMS320F20x/F24x DSP manual Preliminary, Assembly Source for Algorithms, A-16

Assembly Source for Algorithms

PRELIMINARY

* BASE_3 Used for EXE + flw cmd*

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

.include ºsvar20.hº			;defines variables for flash0
			;or for flash1 array
*
MAX_FLW	.set	10000	;Allow only 10000 flw pulses.
INV_ER	.set	018h	;INVERSE ERASE COMMAND WORD
FLWR	.set	6	;FLASH WRITE COMMAND WORD
FLWR_EX	.set	047h	;FLASH WRITE EXEBIN COMMAND WORD
STOP	.set	0	;RESET REGISTER COMMAND WORD
	.def	FLWS
	.ref PROTECT,SEG_ST,SEG_END
	.ref	DELAY,REGS,ARRAY

.sect ºfl_wrtº

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

* FLWS: This routine			is used to check for bits	*
* in depletion mode. If any are found, flash±				*
* write is used to recover.				*
*	AR1	Flash±write pulse count.		*
*	AR2	Used for main banz loop.		*
*	BASE_0 Parameter passed to Set_mode.			*
*	BASE_1	Used for flash address.		*
*	BASE_2	Used for flash data.		*

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

FLWS:

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

*	Code initialization section	*
* Initialize test loop counters:		*
*	AR1 is the number of flash±write pulses.	*

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

SETC	INTM	;Disable maskable ints.
LACL	SEG_ST	;Get segment start address.
AND	#04000h	;Get array start address.
SACL	FL_ST	;Save array start address.
SPLK	#0,ERROR	;Reset error flag.
LAR	AR1,#0	;Set FLW count to 0.
SPLK	#STOP,BASE_0	;Flash STOP command.
CALL	SET_MODE	;Disable any flash commands.
INV_ERASE
SPLK	#INV_ER,BASE_0
CALL	SET_MODE	;Set inverse±erase mode.
BLDD	#FL_ST,BASE_1	;Array start address.
LAR	AR2,#31	;Loop count.
MAR	*,AR2
NEXT_IVERS
LACL	BASE_1	;Get address.
TBLR	BASE_2	;Dummy read.
TBLR	BASE_2	;Dummy read.
TBLR	BASE_2	;Read data.
ADD	#1	;Increment address.
SACL	BASE_1	;Save address.
ZAC
ADD	BASE_2	;Add data.

A-16 PRELIMINARY