[En-Nut-Discussion] function to write data into flash memory

[Dusan Ferbas]

Hi,

I suggest e.g. following, which was digged from eboot\tftp.c. 
Checking for full page and stuffing is done in upper layer. For 
Spm... functions use eboot\flash.* files. Note: we renamed SPMCR to 
SPMCSR in flash.s and also changed 0 (argument) to SPMEN macro.

void FlashPage(unsigned short page, unsigned short *data, unsigned short len)
{
     unsigned short i;
//      if (len > 256)
//              len = 256;

     if (page >= 256) {
         RAMPZ = 1;
     } else
         RAMPZ = 0;
     page <<= 8;

     SpmCommand(page, _BV(PGERS) | _BV(SPMEN));
     SpmCommand(0, _BV(RWWSRE) | _BV(SPMEN));

     for (i = 0; i < len; i += 2)
         SpmBufferFill(i, *data++);

     SpmCommand(page, _BV(PGWRT) | _BV(SPMEN));
     SpmCommand(0, _BV(RWWSRE) | _BV(SPMEN));
}

At 18:19 15.2.2007, you wrote:
>No problem.
>
>The same question I wrote in AVR-LIBC-DEV discussion. There I get 
>the answer by Eric Weddington (Atmel) that I can use the bootloader 
>functions (See <avr/boot.h>).
>
>Thomas
>
>Mustafa Yuecel schrieb:
>>Sorry for the wrong information. I see now that even uromfs does not
>>implement any write function...
>>
>>Thomas Richter wrote:
>>>Hi Mustafa,
>>>
>>>thanks for answer.
>>>
>>>I have checked the avr-libc and the program space utilities yet. But all
>>>functions in the lib only have functionality for reading from program
>>>space.
>>>In the EEPROM handling and Bootloader Support Utilities there are
>>>reading and writing functions. I do not understand why the program space
>>>utitities do not have writing functions.
>>>
>>>My aim is to write data into flash.
>>>
>>>Regards,
>>>Thomas
>>
>>Dusan