8-bit MicrocontrollersのトピックRe: FLASH programming code for JM60

FLASH programming code for JM60

donw — Sat, 27 Jun 2009 09:40:44 GMT

Does someone have the code (prefer assembly code)

for flashing data to a byte or block of flash in a JM60 ?

I dont need anything fancy, just code that runs in RAM with interrupts disabled

(I have looked at the USB bootloader samples, but the flash code is hidden in a library...)

Re: FLASH programming code for JM60

peg — Sat, 27 Jun 2009 12:12:26 GMT

Hello Don,

This should get you started. Should still work with JM apart from any paging type issues .

Re: FLASH programming code for JM60

TurboBob — Thu, 29 Oct 2020 09:48:45 GMT

I am using this in a JM60 project, its an adaptation to the Mini-RAM routines posted in this forum.

const unsigned char ROM_PGM[7]  = {  0xf7,                // sta ,X      FSTAT  0x44,               // lsra -  delay and convert to FCCF bit0xf5,               // Bit X ,fstat0xf5,               // Bit X ,fstat0x27,0xfd,          // BEQ *-10x81                // RTS}; volatile unsigned char PGM[7]  = {  0xf7,                // sta ,X      FSTAT  0x44,               // lsra -  delay and convert to FCCF bit0xf5,               // Bit X ,fstat0xf5,               // Bit X ,fstat0x27,0xfd,          // BEQ *-10x81                // RTS}; void InitFlashRoutine(void)    // match number of bytes above.  {  PGM[0] = ROM_PGM[0];  PGM[1] = ROM_PGM[1];  PGM[2] = ROM_PGM[2];  PGM[3] = ROM_PGM[3];  PGM[4] = ROM_PGM[4];  PGM[5] = ROM_PGM[5];  PGM[6] = ROM_PGM[6];    }byte FlashErasePage(word page) {      asm {      TPA         ; Get status to A      PSHA        ; Save current status        SEI         ; Disable interrupts      LDA  #0x30      STA  FSTAT  ; Clear FACCERR & FPVIOL flags      LDHX  page      STA ,X      ; Save the data      LDA  #$40   ; Erase command      STA  FCMD      LDA  #FSTAT_FCBEF_MASK      LDHX @FSTAT       JSR  PGM      PULA        ; Restore previous status      TAP   }     return (FSTAT & 0x30);  }byte FlashProgramByte(word address, byte data) {      asm{      TPA        PSHA        ; Save current status        SEI         ; Disable interrupts      LDA  #0x30      STA  FSTAT  ; Clear FACCERR & FPVIOL flags      LDHX  address      LDA  data      STA ,X      ; Save the data      LDA  #$20   ; Burn command      STA  FCMD      LDA  #FSTAT_FCBEF_MASK      LDHX @FSTAT       JSR   PGM      PULA        ; Restore previous status      TAP      }     return (FSTAT & 0x30);  }

Re: FLASH programming code for JM60

donw — Sun, 05 Jul 2009 07:51:39 GMT

Thanks Bob & Peg

I have enough to go on with now. I need to alter one or more bytes in a block,

so will copy the flash block to Ram, modify the ram bytes & flash it back to Flash

using the block flash command.

One would think FS would have demo code of these commonly required tasks available....

Re: FLASH programming code for JM60

TurboBob — Sun, 05 Jul 2009 07:58:08 GMT

In my opinion, there is a lot of demo code that FS should have published.

You may want to consider using 2 blocks. Copy block A to RAM, change the bytes you want, then erase and program block B. Then you can work out a recovery plan in case of a reset in the middle of the operation.

Bob

Re: FLASH programming code for JM60

donw — Sun, 05 Jul 2009 08:12:09 GMT

Yes its always a good idea to have a recovery plan!