Thanks Maarten,
The inline asm did the trick. Final code looks like:
static
uint16_t fw_begin(void) __naked
{
__asm__("ldw x,#s_HOME");
__asm__("ret");
}
static
uint16_t fw_end(void) __naked
{
__asm__("ldw x,#s_HOME");
__asm__("addw x,#l_HOME");
__asm__("addw x,#l_GSINIT");
__asm__("addw x,#l_GSFINAL");
__asm__("addw x,#l_CONST");
__asm__("addw x,#l_CODE");
__asm__("addw x,#l_INITIALIZER");
__asm__("ret");
}
I was able to validate this agains ihex content.
It would be nice to be able to access linker defined symbols from C afterall.
On Tue, Jun 14, 2022 at 5:27 PM Maarten Brock <sourceforge.br...@dse.nl> wrote:
>
> Hello Wlodzimierz,
>
> I just tried using inline asm, but could not get it working with .equ
> either.
> It does work however as a return value from a function.
>
> unsigned int get_l_data(void) __naked
> {
> __asm
> ldw x,#l_DATA
> __endasm;
> }
>
> Maarten
>
> Wlodzimierz Lipert schreef op 2022-06-13 08:54:
> > Hello,
> >
> > I would like to impl. FW checksuming for STM8. I was unable to find
> > out how to access l_DATA/s_DATA from C. Looks like all C symbols are
> > prefixed with "_" and there is no way to generate "l_DATA"/"s_DATA"
> > within C.
> >
> > extern uint16_t l_DATA;
> > extern uint16_t s_DATA;
> >
> > static
> > uint16_t calc_fw_checksum(void)
> > {
> > uint16_t crc16 = UINT16_C(0xFFFF);
> > { // .text & data sections
> > uint8_t *begin = (uint8_t*)((uint16_t)&l_DATA);
> > const uint8_t *const end = (uint8_t *)((uint16_t)&l_DATA) +
> > s_DATA;
> >
> > while(begin != end) crc16 = crc16_update(crc16, *begin++);
> > }
> > return crc16;
> > }
> >
> > I have similar code for GCC/AVR.
> > https://github.com/wdl83/rgb_strip_lamp/blob/master/rtu_cmd.c
> >
> > Thanks.
--
BR/Pozdrawiam. Wlodzimierz Lipert
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