LPC Microcontrollers中的主题 Re: Place constant data into flash at specific address

Place constant data into flash at specific address

lpcware — Wed, 15 Jun 2016 19:39:08 GMT

Content originally posted in LPCWare by salmandosersa on Thu Jun 09 07:49:53 MST 2016
Hi

I'm trying to place at the top of the flash a number of version software.
i already tried

const char test[]="HELLO";
and search the string into the .bin file and i couldn't find it.
I know this method don't put the string into a specific address.

I modify the Memory layout to
Flash Location 0x0000 size 0x3000
Flash2 Location 0x3000 size 0x1000
then...
__attribute__ ((section (".rodata.Flash2"))) const char test[]="HELLO";
didn't work.

I'm using LPC1115 LPCXpresso Board with LPCXpresso 8.1.4

thanks

Re: Place constant data into flash at specific address

lpcware — Wed, 15 Jun 2016 19:39:09 GMT

Content originally posted in LPCWare by vtw.433e on Thu Jun 09 08:44:39 MST 2016
Do you use (reference) the variable in your code? If not, the linker will discard it as it is unused. Either use it, or use the "used" attribute.

Re: Place constant data into flash at specific address

lpcware — Wed, 15 Jun 2016 19:39:09 GMT

Content originally posted in LPCWare by salmandosersa on Thu Jun 09 10:24:48 MST 2016
the attribute "used" didn't work, but using it in my code did.

__attribute__ ((used,section (".rodata.$Flash2"))) const char version[] = "V01";
__attribute__ ((used,section (".rodata.$Flash2"))) static const char version[] = "V01";

is that ok?

Thanks

Re: Place constant data into flash at specific address

lpcware — Sun, 19 Jun 2016 01:12:51 GMT

bump