S12 / MagniV MicrocontrollersのトピックRe: programming the xdp512 eeprom not working

programming the xdp512 eeprom not working

e_taylor — Tue, 30 Dec 2008 06:14:17 GMT

hello again:

i'm having a mental block on something that should be quite straight forward. following the flow chart of the S12XEETX4KV2 module i arrived at this code.

EPROT is set at the start

movb #%11111000,EPROT

and the eeprom is erased by the start of code warrior.

when i call the routine it does not program the word as expected.

LoadMachineDefaults
   ldx #DJoystick1XMax     ;start address of default data
  ldy #Joystick1XMax     ;start address of eeprom
   brset ECLKDIV,mECLKDIV_EDIVLD,CheckCBEIF
   movb #%01001010,ECLKDIV
CheckCBEIF brclr ESTAT,#mESTAT_CBEIF,*
   ldd 2,x+
  std 2,y+
  movb #$20,ECMD     ;
  movb #mESTAT_CBEIF,ESTAT
  brclr ESTAT,#mESTAT_CBEIF,*
  brclr ESTAT,#mESTAT_CCIF,*
  rts

any help is greatly appreciated!

regards,

Re: programming the xdp512 eeprom not working

kef — Tue, 30 Dec 2008 16:58:39 GMT

How do you check it doesn't program? Debugger may not update contents of nonvolatile memory. If you are really sure it doesn't work, then inspect ESTAT before and after programming routine. What's the state of ACCERR and PVIOL bits.

Re: programming the xdp512 eeprom not working

e_taylor — Wed, 31 Dec 2008 04:24:48 GMT

hi kef:

thanks for your reply! the debugger is set to display the contents of nonvolitile memory. i used the following code which is contrary to the manual and will only work in special mode (bdm connected) to write to the eeprom. it works and the debugger displays the correct data. this is not the correct method and i'll need to figure it out. i'm now suspect that the eeprom circuit may not work correctly with the bdm pod attached. i was polling the ACCERR and PVIOL prior to the routine.

thanks again and a happy new year to you!

   ldx #DJoystick1XMax     ;start address of default data
  ldy #Joystick1XMax     ;start address of eeprom
   brset ECLKDIV,mECLKDIV_EDIVLD,CheckCBEIF
   movb #%01001010,ECLKDIV
CheckCBEIF brclr ESTAT,#mESTAT_CBEIF,*
LMDLoop  ldd 2,x+
  std EDATAHI
  sty     EADDRHI
  iny
  movb #$20,ECMD     ;
  movb #mESTAT_CBEIF,ESTAT
  brclr ESTAT,#mESTAT_CBEIF,*
  brclr ESTAT,#mESTAT_CCIF,*
  cpx #EndOfMachineDefaults+1 ;#EndOfMachineDefaults+1
  blo LMDLoop

Re: programming the xdp512 eeprom not working

e_taylor — Wed, 31 Dec 2008 08:22:56 GMT

hi kef:

thanks again for your reply. i was asleep at the switch and was looking at $800 which is the paged window and not location $c00 which indeed programsjust fine.

regards,