ColdFire/68K Microcontrollers and ProcessorsのトピックRe: Need Help About MCF51EM256 Flash Programming Routines

Need Help About MCF51EM256 Flash Programming Routines

Nur — Mon, 31 Jan 2011 17:07:46 GMT

Hi all,

I have a problem about flash programming for MCF51EM256. I downloaded application note by AN3942 document number and also downloaded software by AN3942SW number. And then I followed the instructions (also set my flash clock). My erase function is running perfectly but my burst program is not. It is writing my datas to the given address but it can not jump to subroutine. Here are the burst code from AN3942SW;

/*******************************************************************************/

_Burst_Prog:
             move.l d0,d4
             move.l a1,a3
             move.l a0,d2
             move.l a0,d6

             cmpi.l   #0x1FFFF,d6
             bgt.s    SEC_ROUT2

             move.l #(SpSubBurstEnd),a1
             move.l #(SpSubBurst),a6

             bra     DOONSTACK2

SEC_ROUT2:   move.l #(SpSubBurstEnd2),a1
             move.l #(SpSubBurst2),a6

DOONSTACK2: bsr     DoOnStack

               cmpi.l   #0x1FFFF,d6
               bgt.s    SECOND_BLOCK2

FIRST_BLOCK2:
               move.l a0,a1
               move.b #(mF1STAT_FCCF + mF1STAT_FCBEF),d0
               move.b d0,F1STAT
               bra     JMP_STACK2
SECOND_BLOCK2:
               move.l a0,a1
               move.b #(mF2STAT_FCCF + mF2STAT_FCBEF),d0
               move.b d0,F2STAT
JMP_STACK2:
              jsr     (A1)                      //The problem is here
           rts

/*******************************************************************************/
DoOnStack:
             move.l A7,A2       /* save actual address SP */
DoOnStack1:
             suba.l #2,a7

             move.w (a1),d0
             move.w d0,(A7)

             cmpa.l a6,a1       /* SELECTED #(SpSubBurst) or #(SpSub) */
             suba.l #2,a1
             bne.s   DoOnStack1

             move.l A7,A0
             move.l A2,A7
             rts

/*******************************************************************************/

What sould I do?

Thank you,

Nur

Re: Need Help About MCF51EM256 Flash Programming Routines

kef — Mon, 31 Jan 2011 18:11:46 GMT

It is weird that _Burst_Prog is trying to launch flash command by writing one to FCBEF bit. If this attempt is accepted by flash controller, then CPU should runaway, because _Burst_Prog is probably in flash and flash is not readable while being programmed, CPU can't read opcodes etc. Writing one to FCBEF should be done only in one of Spxxxx routines, which are copied by DoOnStack routine to RAM(stack). Maybe they ware trying to clear FPVIOL and FACCERR bits? Try commenting out in _Burst_Prog

move.b d0,F1STAT
and

move.b d0,F2STAT

or replace

move.b #(mF1STAT_FCCF + mF1STAT_FCBEF),d0

and

move.b #(mF2STAT_FCCF + mF2STAT_FCBEF),d0

with

move.b #(mF1STAT_FPVIOL + mF1STAT_FACCERR),d0

and

move.b #(mF2STAT_FPVIOL + mF2STAT_FACCERR),d0

Re: Need Help About MCF51EM256 Flash Programming Routines

Nur — Mon, 31 Jan 2011 19:41:12 GMT

Thank you, but the problem is still remaining...