how to copy a subroutine from FLASH to RAM

[CASEYKEVIN]

I am new to Freescale MCU,HCS08

in my application, i need to reprogram some flash area to update my parameters, my upate subroutine  locate in FLASH

i shoud copy the update subroutine from FLASH to RAM, and re-program  flash , right?

if it is right ,how to how to copy a subroutine  from FLASH to RAM?

any guys here know how to do it, plz tell me, thanks a aot

[bigmac]

Hello,

There are two different methods of using RAM for the programming of non-volatile data.  One method uses the stack, as Peg has referenced.  The second method uses a fixed block of RAM, often placed at the bottom of the stack.  In this case the temporary block size can be as little as 20 bytes.  I recall that the code required for this method has also been previously placed on this forum - see if you can find it using the forum search.

You do not say whether you are coding in assembly or C.

Regards,

Mac

[CASEYKEVIN]

hi,mac

i am coding in C langeuage, do i need to use assembly to do it?

[peg · Accepted solution]

Hello caseykevin,

Welcome to the fora!

Take a look https://community.freescale.com/message/35354#35354

The key is the doonstack subroutine

[CASEYKEVIN]

thank u for your link,i will go to read it