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C-Callable Interface to Flash Algorithms
PRELIMINARY
A-31
Assembly Source Listings and Program Examples
PRELIMINARY
;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************************