Copy function in RAM

I have found a example how to define a function in RAM(C:\Keil\ARM\RV30\Examples\RAM_Function).
But after debuggging when i look in the map.file i realise that this function still stay in ROM.
and i don't have her adress in RAM so that i would be able to use the IAP function(copy RAM to flash).

please help me to get a solution.

Best regard

I have found a example how to define a function in RAM(C:\Keil\ARM\RV30\Examples\RAM_Function).
But after debuggging when i look in the map.file i realise that this function still stay in ROM.
and i don't have her adress in RAM so that i would be able to use the IAP function(copy RAM to flash).

please help me to get a solution.

Best regard

Note that when you need initialized data or code in RAM, the linker has to place he information in ROM and the initialization code can then copy the information to RAM when the system is booting.

When a compiler + linker supports placing initialized data in RAM, it will generate all address references in the code as if the data was in RAM, but will store a copy of the data in ROM. After the init code have moved the data, you will access it just as if it had been in RAM from the beginning - your program will not know that there is a (possibly compressed) copy of the data somewhere in the ROM image.

If the information was immediately placed in RAM, you would be able to send the information to the chip using a JTAG interface or similar, but you would loose that information as soon as the chip lost power or was reset.

Thank you so much for this important information.

If the information was immediately placed in RAM, you would be able to send the information to the chip using a JTAG interface or similar

Until now i can't see the function in the RAM and that blocks me for using IAP function, because i need the address of the function in RAM so that i will be able to use IAP command: copy RAM to flash.

I am thankfull for any help.

Best regards.

Hallo every body!

Can somebody tell me whether i need the RAM address of the function for IAP programming in this example?
And the definition of the function from sector number
i don't realy understand that.Can you try to explain to me?.

 unsigned int get_secnum (unsigned int addr)  {
  unsigned int n;

  n = ((unsigned int) addr >> 13) & 0x1F;        // pseudo sector number

  if (n >= (0x30000 >> 13))  {
    n -= 14;                                    // high small 8kB Sectors (
  }
  else if (n >= (0x10000 >> 13))  {
    n  = 7 + (n >> 3);                          // large 64kB Sectors
  }
  return (n);                                   // sector number
}

 unsigned int program (unsigned int flash_addr, unsigned char *data, unsigned int size)  {
  struct iap_in  iap;                      // IAP input parameters
  unsigned int result[16];                 // IAP results
  unsigned int save_VicInt;                // for saving of interrupt enable register

  save_VicInt = VICIntEnable;              // save interrupt enable status
  VICIntEnClr = 0xFFFFFFFF;                // disable all interrupts

#ifdef BYPASS_IAP
  stop_pll();                              // IAP requires to run without PLL
#endif

  iap.cmd = 50;                            // IAP Command: Prepare Sectors for Write
  iap.par[0] = get_secnum (flash_addr);    // start sector
  iap.par[1] = iap.par[0];                 // end Sektor
  iap_entry (&iap, result);                // call IAP function
  if (result[0])  goto exit;               // an error occured?

  iap.cmd = 51;                            // IAP Command: Copy RAM to Flash
  iap.par[0] = (unsigned int) flash_addr;  // destination-addr
  iap.par[1] = (unsigned int) data;        // source-addr
  iap.par[2] = size;                       // number of bytes
  iap.par[3] = 12000;                       // CPU clock  in kHZ
  iap_entry (&iap, result);                // call IAP function

exit:

char var[512];

 int main(void){
   erase   (0x30000, 0x31FFF);
 program (0x30000, var, sizeof (var)); }

please i realy need your Help.

tanks.

Somebody tall me that it is not possible to use IAP programming with the evalution version of the RealView.Is that true?

Best regards

Theirs should not be any problem in using IAP function in evaluation version.
You dont need to copy any code to RAM for IAP.

Just be sure your IAP execute routine is their.
If its in assembly normally it will hve .

Store your present registers along with return address.

a call to location (0x7FFFFFF1). This will give a call in thumb mode.*** This is a branch to the IAP function.

Relaoad values of registers from stack Return to mail program.

Also be sure your buffer (RAM) is word alligned.

Suvidh