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Implemented load of OSCCAL value (draft) #343

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Implemented load of OSCCAL value (draft) #343

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6c126cb
Implemented load of osccal value (draft)
LadislavOzobot Apr 7, 2022
1b609bb
Updated calibration procedure to use OSCCAL from defines to correct s…
LadislavOzobot Apr 12, 2022
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9 changes: 7 additions & 2 deletions optiboot/bootloaders/optiboot/optiboot.c
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Original file line number Diff line number Diff line change
Expand Up @@ -694,13 +694,18 @@ void pre_main(void) {
// entry to this function will always be here, independent of
// compilation, features etc
asm volatile (
" rjmp 1f\n"
" rjmp start_main\n"
#if APP_NOSPM
" ret\n" // if do_spm isn't include, return without doing anything
#else
" rjmp do_spm\n"
#endif
"1:\n"
"set_osccal:\n" // start_main must difer only by extra 1s, so they can be overwritten to 0s after calibration is done. Here is rjmp is set default to 0x05 and would overwrite to 0x01.
" nop\n"
" ldi r24, 0xFF\n"
" sts %[osccal_reg], r24\n"
"start_main:\n"
: : [osccal_reg] "M" (_SFR_MEM_ADDR(OSCCAL)) : "r24"
);
}

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