IAP on the Philips P89V51RD2

[laurah]

Basically, I just want my program to be able to save preferences changes that users make when using the program on the chip. I figured that using IAP to save a few integers would make it possible to recall those integers if there was a power cycle.

I am programming in C on a Keil uVision 3 platform. I understand that to do IAP will require some assembly language. I was hoping that someone might have some simple C code that calls some simple assembly code that can perform Read/Write using IAP.

Thanks

 

[laurah]

Anyone? Please?

Basically, I just want my program to be able to save preferences changes that users make when using the program on the chip. I figured that using IAP to save a few integers would make it possible to recall those integers if there was a power cycle.

I am programming in C on a Keil uVision 3 platform. I understand that to do IAP will require some assembly language. I was hoping that someone might have some simple C code that calls some simple assembly code that can perform Read/Write using IAP.

Thanks

 

[snaiks]

Basically, I just want my program to be able to save preferences changes that users make when using the program on the chip. I figured that using IAP to save a few integers would make it possible to recall those integers if there was a power cycle.

I am programming in C on a Keil uVision 3 platform. I understand that to do IAP will require some assembly language. I was hoping that someone might have some simple C code that calls some simple assembly code that can perform Read/Write using IAP.

Thanks

refer http://www.efton.sk/t0t1/p89v51rd2 iap.pdf

 

[oyaramana]

How to store user defined values into P89v51RD2. please guide me.

 

[snaiks]

;http://www.efton.sk/t0t1/p89v51rd2 iap.pdf

;=========================================================================
$MOD52
FCF EQU 0B1h
ORG 0
ljmp Reset
;---- interrupt vectors
;none here
;---- "main"
Reset:
;if we try to rewrite an already programmed byte without previously erasing it, this will fail:
MOV DPTR, #TestArea1
MOV A, #55h
CALL FLASH_PROGRAM_BYTE
;this is how a sector has to be erased prior bytes in it are being rewritten:
MOV DPTR, #TestArea2
CALL FLASH_ERASE_SECTOR
MOV DPTR, #TestArea2
MOV A, #0AAh
CALL FLASH_PROGRAM_BYTE
Stop: SJMP Stop
;---- data area, 128-byte sectors
;make sure that there is no code in the whole sector,
;as upon updating the data the whole sector gets erased
ORG 0080h
TestArea1:
db 0, 0
ORG 0100h
TestArea2:
db 0, 0
;end of TestArea2 at 017F
ORG 0180h
;rest of code may go here
;---- FLASH API - must be located anywhere ABOVE 2000h
ORG 03F00h
;programs a single byte in FLASH
;DPTR=addres, A=content of byte to be programmed
;the position to be programmed must be previously erased
FLASH_PROGRAM_BYTE:
PUSH IE ;DISABLE INTERRUPTS
CLR EA
MOV R1,#02 ;SETUP OPERATION CODE -- write byte
ANL FCF,#0FCh ;enable boot sector - !!! this command MUST be located ABOVE 2000h!!!
CALL 01FF0H ;call to ISP_API (modifies B register but no Rx)
ORL FCF,#001h ;switch back to user FLASH
POP IE
RET
;erases a 128-byte sector in FLASH
;DPTR=address of first byte of sector to be erased
FLASH_ERASE_SECTOR:
PUSH IE ;DISABLE INTERRUPTS
CLR EA
MOV R1,#08 ;SETUP OPERATION CODE -- erase sector
ANL FCF,#0FCh ;enable boot sector - !!! this command MUST be located ABOVE 2000h!!!
CALL 01FF0H ;call to ISP_API (modifies B register but no Rx)
ORL FCF,#001h ;switch back to user FLASH
POP IE
RET
;----- that's all, folks
END