S12 / MagniV MicrocontrollersのトピックRe: How to read the D-Flash

How to read the D-Flash

herefent — Sat, 18 May 2013 09:38:06 GMT

I am programming the function of writing and reading data from D-Flash of the mc9s12xs128maa.

It seem that i can erase and write the sector because the FSTAT is 0x80 after i called Flash_Erase() and Flash_Write(),but i don't konw how to read the data from D-Flash.Could someone help me?

Here is my code:

void Flash_Init()

{

FCLKDIV=0x0f;

DFPROT=0x80;

}

void Flash_Erase() {

DisableInterrupts;

if ((FSTAT & 0x30) != 0) {

FSTAT |= 0x30; // clear ACCERR or FPVIOL if set

}

FCCOBIX = 0x00; /* index 0 */

FCCOBHI = 0x12; /* D-Flash Erase command */

FCCOBLO = 0x10; /* Global address value i.e. G-Page value */

FCCOBIX = 0x01; /* index 1 */

FCCOB = 0x0f00; /* sector address of a D-Flash */

FSTAT = 0x80;

while(!FSTAT_CCIF);

EnableInterrupts;

}

void Flash_Write(unsigned char address){

DisableInterrupts;

while(FSTAT_CCIF==0) ;

if ((FSTAT & 0x30) != 0) {

FSTAT |= 0x30; // clear ACCERR or FPVIOL if set

}

FCCOBIX = 0;

FCCOBHI = 0x11; // prog D-flash

FCCOBLO = 0x10; // global addr

FCCOBIX = 1;

FCCOB = 0x0f00; //global addr - within an erased sectot

FCCOBIX = 2;

FCCOB = 0xabab;

FCCOBIX = 3;

FCCOB = 0xabab;

FSTAT = 0x80;

while(!FSTAT_CCIF);

EnableInterrupts;

}

word Flash_Read(unsigned char address){

word *p;

p=(word*)(0x100f00);

return *p;

}

Flash_Init();

Flash_Erase();

Flash_Write(0);

Flash_Read(0);

called in main.

thinks.

Re: How to read the D-Flash

herefent — Tue, 21 May 2013 00:08:54 GMT

I had solved the problem by myself. Originally, we should set the EPAGE register to determine which D-Flash sector map the local address in 0x0800 that is used as a D-Flash window to access globle address from 0x10000 to 0x101fff.

Here is my code.

void Flash_Init()

{

FCLKDIV=0x0f;

DFPROT=0x80;

EPAGE=0x00;

}

void Flash_Erase() {

DisableInterrupts;

if ((FSTAT & 0x30) != 0) {

FSTAT |= 0x30; // clear ACCERR or FPVIOL if set

}

FCCOBIX = 0x00; /* index 0 */

FCCOBHI = 0x12; /* D-Flash Erase command */

FCCOBLO = 0x10; /* Global address value i.e. G-Page value */

FCCOBIX = 0x01; /* index 1 */

FCCOB = 0x0000; /* sector address of a D-Flash */

FSTAT = 0x80;

while(!FSTAT_CCIF);

EnableInterrupts;

}

void Flash_Write(unsigned char address,word value){

DisableInterrupts;

while(FSTAT_CCIF==0) ;

if ((FSTAT & 0x30) != 0) {

FSTAT |= 0x30; // clear ACCERR or FPVIOL if set

}

FCCOBIX = 0;

FCCOBHI = 0x11; // prog D-flash

FCCOBLO = 0x10; // global addr

FCCOBIX = 1;

FCCOB = 0x0000+address; //global addr - within an erased sectot

FCCOBIX = 2;

FCCOB = value;

FSTAT = 0x80;

while(!FSTAT_CCIF);

EnableInterrupts;

}

unsigned char Flash_Read(unsigned char address){

unsigned char *p;

p=(unsigned char*)(0x0800+address);

return *p;

}

Because i only have 10 foat-data to store, i just implement a sector of D-Flash which has 256byte.