Texas Instruments TMS320F20x/F24x DSP Preliminary, C-Callable Interface to Flash Algorithms, A-30

C-Callable Interface to Flash Algorithms

PRELIMINARY

ADD	#1	;Increment fail count.
SACL	ERS_COUNT	;Save new count.
SUB	#10	;CHECK for max of 10.
BCND	ers_error,GT	;If ers_cout>10 then hard fail.
CALL	FLWS	;Else, try to recover from depletion.
LACL	ERROR	;Check for FLASH±WRITE error.
BCND	ers_error,neq ;If couldn't recover, then hard fail.
B	ers_loop	;Else, try erase again.
ers_error:
LACL	#0	;Error while erasing.
ers_done:
LAR	AR1,SV_AR1	;Restore AR1.
CLRC	OVM	;Disable overflow.

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

;Begin C Post Processing

mar *,ar1
sbrk #1
lar	ar6,*±	;save FP
lar	ar0,*±	;save ar6
pshd	*	;pop return address, push on s/w stack

;End C Post Processing ret

*****************END of _erase****************************

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

*	function program(PROTECT,PRG_bufaddr,PRG_paddr,	*
*	PRG_length)	*
* Status will be returned in the accumulator.		*
*	0 = Fail, 1 = Pass	*

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

*	This function performs the	program operation on the *
*	'F2XX flash. The values to	be programmed will be read *

*from a buffer in data memory. The function can program*

*one to n words of flash in a single call; restricted *

*	only by the data buffer size. If the function passes, *
*	the flash was programmed correctly. The function is		*
*	controlled by the following parameter list:		*
*	1)PROTECT	±flash segments to protect.	*
*	2)PRG_bufaddr ±Start address of program buffer in		*
*		data memory.	*
*	3)PRG_paddr	±Start address of flash locations to *
*		be programmed.	*
*	4)PRG_length	±Number of words to be programmed.	*
*			*
*	To program 20 words of flash1 starting at address		*
*	0x4020, from a buffer at 0x0800@data use this:		*
*	program(0xff00,0x0800,0x4020,20).		*

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

_program:

PRG_PARAMS	.set	4
AR_STACK	.set	ar1

;**Parameters to be popped from s/w stack.

AR_PROTECT	.set ar2
AR_bufaddr	.set ar3
AR_paddr	.set ar4
AR_length	.set ar5

A-30 PRELIMINARY