Texas Instruments TMS320F20x/F24x DSP Preliminary, C-Callable Interface to Flash Algorithms, A-31

PRELIMINARY

C-Callable Interface to Flash Algorithms

;Begin C Preprocessing

POPD *+	; pop return address, push on s/w stack
sar ar0,*+	; save FP
sar ar6,*	; save ar6
sbrk #3

;Local variables (and parameters) are set up as follows:

;get arguments and place them properly ± take them from ;the software stack and place them into their correct ;positions

lar AR_PROTECT,*± lar AR_bufaddr,*± lar AR_paddr,*± lar AR_length,*±

adrk #PRG_PARAMS+4 ; ar1 = next empty point on stack (SP)

;End C Preprocessing

LDP	#PARMS
SAR	AR1,SV_AR1	;Save AR1.
SPLK	#0,ERROR	;Set algo error flag to 0
		;(no errors).

**********Put parameters where they belong.**********

SAR AR_PROTECT,PROTECT SAR AR_bufaddr,PRG_bufaddr SAR AR_paddr,PRG_paddr SAR AR_length,PRG_length

***********Next, program flash ************

CALL		GPGMJ		;Program flash from buffer.
LACL		ERROR		;Check for program error.
BCND		prg_error,neq ;If error then clear ACC.
LACL		#1		;Else, No errors programming.
B		prg_done
prg_error:
LACL		#0		;Error while programming.
prg_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 _program************************

PRELIMINARY Assembly Source Listings and Program Examples A-31