Hi,

I am using the psoc 5 with 256k flash for a project and need to set some locations of the flash to a pre-defined value during compile time.

i.e. I need to put 0xAA in adress 0x3ffff ( the last byte of the flash). This is for a signature checking for production process.

Any idea how to do it with the PSoC creator?

Thanks

Lawrence

 Don't worry, I figured out how to do this..

hey lleung

can you please share with us how u were able to do it?

i tried _at_ but in vain.

Put this in the source file.

unsigned char ucCRCdata __attribute__ ((section (".CRCDATA"))) = 0xAA;

And go to the psoc creator

build setting -> linker -> command line

in the custom flags, add

-Wl,--section-start=.CRCDATA=0x30000

Please also notice that you can not do this after 0x3fffc( or the last 4 byte of your chip). The compiler will fail.

I think that's because the ARM is 32 bit machine so the last address it can use is should be the last but 4.

thank you very much for your quick reply.

i tried the same code in a sample project and tried to verify in debug mode. but i wasn't able to see the 0xAA at the location 0x30000. is it the right way to verify, or is there anything i am missing out?

thanks once again.

you can check the memory data in the psoc creator after downloading the code to the chip.

you can also check the hex file, the content should be around line 3076

One more thing is that the compiler would omit the code if it was not used.

In your code, you should use/refer to it at least once directly(not via a pointer).

that's absolutely right lleung !

After using the variable in the code, i was able to see the required value in the specified memory location when i ran it in the debug mode.

thanks a lot !

Good to hear that