Help with variable declaration

(2 posts) (2 voices)

yokurk
Member

Hi all,
im new to this platform and am trying to port a program i was using with arduino to maple.
The program is something related to lcd display.

I have avoided use of pgmspace.h by using the declarations as suggested in http://leaflabs.com/docs/arm-gcc.html#switching-from-avr-gcc

The problem is the file depends on another file that holds an array :

unsigned char Song9[12*95] __FLASH__={
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
...,...,...
}
When i compile this i get this error:
error: expected '=', ',', ';', 'asm' or '__attribute__' before '__FLASH__'

Please help me with this. And the array holds some char values.

Please explain how you store it in the Flash or along with the program itself (either way is ok).

Posted 4 years ago #
gbulmer
Moderator
I assume the ...,...,... is just you shortening the example.

put a ; after the closing }
(I'd put a space around the =, but it doesn't matter)
```
unsigned char Song9[12*95] __FLASH__ = {
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
// ..., ..., ...
};
```
There isn't anything else to do. Pointers, or indexing into the array 'just work' (TM:-).
Unlike the Atmel AVR, and some other microcontrollers (MCUs), the ARM Cortex-M3 has a single 32-bit address space for program, data and peripheral, so Cortex-M3 MCUs don't need special instructions to read flash.
Posted 4 years ago #

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