optimized code doesn't use cbi / sbi #2
Description
#define sclk 52
digitalWriteFast(sclk, HIGH);
12c6: 85 b1 in r24, 0x05 ; 5
12c8: 82 60 ori r24, 0x02 ; 2
asm volatile("nop \n\tnop \n\t");
12ca: 00 00 nop
12cc: 00 00 nop
digitalWriteFast(sclk, LOW);
12ce: 8d 7f andi r24, 0xFD ; 253
12d0: 85 b9 out 0x05, r24 ; 5
after much research, this issue is that the __atomicWrite__ function is missing
volatile casts on the first parameter to bitWrite which is causing the compiler
to do various optimizations.
Attached is a correct version of the code. I've removed the (uint8_t*) casts
in the digital macros and just placed them in the atomicWrite macro
Original issue reported on code.google.com by cr...@moonrock.com on 4 Aug 2011 at 6:08
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