Texas Instruments TMS320F20x/F24x DSP Preliminary, C-Callable Interface to Flash Algorithms, A-28

C-Callable Interface to Flash Algorithms

PRELIMINARY

;**Variables included from flash algorithms.

.include ºsvar20.hº		;Variable declarations
.ref	GCLR	;References clear algo.
.ref	GPGMJ	;References program algo.
.ref	GERS	;References erase algo.
.ref	FLWS	;References flash±write algo.
;**Parameters used by flash algorithms.
.def	PRG_bufaddr, PRG_paddr
.def	PRG_length, PARMS
.def	SEG_ST,SEG_END,PROTECT

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

VARS: .usect ºPRG_dataº,16 ;This is an uninitialized data	*
;section required by the standard *
;flash algos for temporary	*
;variables. Pointers to this	*
;space are hardcoded in SVAR20.H, *
;and variables are init'd at	*
;run time.	*

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

PARMS: .usect ºPRG_parmº,10 ;This is an uninitialized data	*
;section used for temporary	*
;variables and for passing	*
;parameters to the flash	*
;algorithms.	*

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

PROTECT .set PARMS ;Segment enable bits.*

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

*****Parameters needed for Programming algorithm. ********

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

PRG_bufaddr	.set	PARMS+1	;Addr of buffer for pgm data	*
PRG_paddr	.set	PARMS+2	;First flash addr to program	*
PRG_length	.set	PARMS+3	;Length of block to program	*

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

**Parameters needed for CLEAR, ERASE, and FLW algorithms. *

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

SEG_ST	.set	PARMS+4	;Segment	start address.	*
SEG_END	.set	PARMS+5	;Segment	end address.	*

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

****Other misc variables.****

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

ERS_COUNT .set		PARMS+6	;Used	for erase fail count.	*
SV_AR1	.set	PARMS+7	;Used	to save AR1.	*

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

.sect ºPRG_textº

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

*	function erase(PROTECT,SEG_ST,SEG_END)	*
* Status is returned in the accumulator.		*
*	0 = Fail,1 = Pass	*

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

*	This function performs the clear and erase operation	*
*	on the 'F2XX flash. If the erase operation fails, the *
*	flash±write operation is used to try to recover from	*
*	depletion. If the array recovers, the entire process	*
*	(clr+ers+flw) is repeated a maximum of 10 times. The	*
*	return value indicates the status. If this function	*

A-28 PRELIMINARY