Prgramming HCS08 Flash - Help Needed

Davo — Sat, 14 Jul 2007 18:38:12 GMT

I am creating some code to save configs in Flash on a HCS908QG8. Single byte writes are fine. I created the code from scratch, but find it is locking-up the micro. I then lifted the code from AN2496 and I get the same result. The problem occurs as soon as I issue the program command.

Any help is appreciated. The code is listed below.

byte_pgm: equ $20 ;Command to program a single byte

; bit position masks
mFCBEF:     equ   %10000000   ;flash command buffer empty flag
mFCCF:      equ   %01000000   ;flash command complete flag
mFPVIOL:    equ   %00100000   ;flash protection violation
mFACCERR:   equ   %00010000   ;flash access error
mFBLANK:    equ   %00000100   ;flash verified as all blank (erased =$ff) flag

sei

* Flash Routines Initialisation

  lda #!45
  sta rFCDIV   ;Set the flash clock divider register to produce 186kHz clock
  ldhx #vNVStorageStart ;Set up an address pointer
  sthx wAddrFlashWrite  ; "
  lda #'a'   ;Create some test data
  sta yFlashByte  ; "
  jsr COP_Reset

ProgFlashByte lda #mFPVIOL|mFACCERR ;error flag bits to clear if set
sta rFSTAT ;clear any error flags

  ldhx wAddrFlashWrite  ;Get address to program
  lda yFlashByte  ;Store the byte in flash
  sta ,X   ; "
  aix #1   ;Save address of next free config space in flash
  sthx wAddrFlashWrite  ; "

  lda #byte_pgm  ;page write command
  sta rFCMD   ;initiate the programming sequence
  lda rFSTAT
  ora #mFCBEF
  sta rFSTAT   ;launch the command
         nop    ;burn bus cycs before chking status
  nop
  nop
  nop
  nop

  lda rFSTAT   ;look at status register for errors
  and #mFPVIOL|mFACCERR ;error flag bits
  bne flash_error  ;check for programming errors
pgm_loop: lda rFSTAT   ;wait around unil prog'ing complete
  and #mFCCF   ;command complete yet?
  beq pgm_loop  ;not done yet..loop until complete

Re: Prgramming HCS08 Flash - Help Needed

thisobj — Sun, 15 Jul 2007 06:56:02 GMT

Hi Davo,

You didn't mention code location in your post, but code that programs flash memory locations must run in RAM.

Regards,

Frank

8-bit MicrocontrollersのトピックPrgramming HCS08 Flash - Help Needed

Prgramming HCS08 Flash - Help Needed

Re: Prgramming HCS08 Flash - Help Needed