Erease Flash 0n MC9S08QE8

DavidoBG — Tue, 03 Feb 2009 20:50:17 GMT

To erase flash, i use following code and asm code doonstack.asm

#include <hidef.h> /* for EnableInterrupts macro */
#include "derivative.h" /* include peripheral declarations */
#include "hcs08.h" // This is our definition file!
#include <MC9S08QE8.h>
#include "doonstack.h"

#define BUSCLK 8000000
#define vFCDIV (BUSCLK/200000-1)

char fdata, operation;
unsigned int faddress;

// Write-protect addresses ranging from 0xE400 up to 0xFFFF
const byte NVPROT_INIT @0x0000FFBD = 0xE2;

// MCU innitialization
void mcu_init(void)
{
SOPT1 = bBKGDPE;        // Enable debug pin
ICSSC = NVFTRIM;       // configure FTRIM value
ICSTRM = NVICSTRM;     // configure TRIM value
ICSC2 = 0;              // ICSOUT = DCOOUT / 1
// BUSCLK is now 8 MHz
FCDIV = 39;//vFCDIV;         // set FCLK divider (FCLK = 200kHz)
}

#pragma inline
// Read the content of a memory address
char flash_read(unsigned int address)
{
unsigned char *pointer;
pointer = (char*) address;
return (*pointer);
}

// Write a byte into the specified FLASH address
char flash_write(unsigned int address, unsigned char data)
{
unsigned char *pointer;
pointer = (char*) address;
FlashProg(pointer,data); // call the FLASH programming function
if (FSTAT_FACCERR) data=1; else data=0;
if (FSTAT_FPVIOL) data|=2;
return(data);
}

// Erase a sector of the FLASH memory
unsigned char flash_sector_erase(unsigned int address)
{
unsigned char *pointer, res;
pointer = (char*) address;
FlashErase(pointer);
if (FSTAT_FACCERR) res=1; else res=0;
if (FSTAT_FPVIOL) res|=2;
return(res);
}

void main(void)
{
mcu_init();
fdata = 0;
faddress = 0xE200;
operation = 1;
while (1)
{
    switch (operation)
    {
      case 1: // sector erase
        fdata = flash_sector_erase(faddress);
        operation = 2;
        break;
      case 2: // write operation
        faddress = 0xE200;
        fdata = 'D';
        fdata = flash_write(faddress,fdata);
        operation = 3;
        break;
      case 3: // read operation
        faddress = 0xE200;
        fdata = flash_read(faddress);
        operation = 0;
        break;
    }
}
}

If i run full chip simulation and i run code my erase function don't run. I don't kown why?

Do you have any idea about this?

Thanks

david

Re: Erease Flash 0n MC9S08QE8

bigmac — Tue, 03 Feb 2009 21:05:10 GMT

Hello David,

Please refer to the following recent thread -
http://forums.freescale.com/freescale/board/message?board.id=CW816COMM&thread.id=5101

Regards,
Mac

Message Edited by bigmac on 2009-02-04 12:10 AM

topic Re: Erease Flash 0n MC9S08QE8 in 8-bit Microcontrollers

Erease Flash 0n MC9S08QE8

Re: Erease Flash 0n MC9S08QE8