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Workaround ++gfCacheP into postincrement ld r22, Z+ 

TODO: ideally improve the automaton to work with postincrement only, at
least in this case.
This commit is contained in:
D.R.racer 2021-01-27 09:52:20 +01:00
parent d275fe0e83
commit b6c59e08ac
1 changed files with 2 additions and 0 deletions
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2
Firmware/SdFile.cpp
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@ -74,10 +74,12 @@ void __attribute__((noinline)) SdFile::gfUpdateCurrentPosition(uint16_t inc){
#define find_endl(resultP, startP) \
__asm__ __volatile__ ( \
"adiw r30, 1 \n" /* workaround the ++gfCacheP into post increment Z+ */ \
"cycle: \n" \
"ld r22, Z+ \n" \
"cpi r22, 0x0A \n" \
"brne cycle \n" \
"sbiw r30, 1 \n" /* workaround the ++gfCacheP into post increment Z+ */ \
: "=z" (resultP) /* result of the ASM code - in our case the Z register (R30:R31) */ \
: "z" (startP) /* input of the ASM code - in our case the Z register as well (R30:R31) */ \
: "r22" /* modifying register R22 - so that the compiler knows */ \