Apple-2-SW/apple2048
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Use the volatile keyword with all inline assembly to make sure the optimizer doesn't remove it.

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Jeremy Rand 2018-10-21 14:26:19 -04:00
parent 209b1ef23e
commit 74cf2775f1
4 changed files with 2 additions and 2 deletions
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apple2048.xcodeproj/project.xcworkspace/xcuserdata/jrand.xcuserdatad/UserInterfaceState.xcuserstate generated
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apple2048/Makefile
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@ -70,7 +70,7 @@ SRCDIRS+=
# If you want to add arguments to the compile commandline, add them # If you want to add arguments to the compile commandline, add them
# to this variable: # to this variable:
CFLAGS += -Oi CFLAGS += -O
# If you want to add arguments to the assembly commandline, add them # If you want to add arguments to the assembly commandline, add them
# to this variable: # to this variable:

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apple2048/make/V2Make.scpt
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apple2048/ui.c
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@ -33,7 +33,7 @@ void playSound(int8_t freq, int16_t duration)
return; return;
while (duration > 0) { while (duration > 0) {
asm ("STA %w", 0xc030); asm volatile ("STA %w", 0xc030);
while (freq > 0) { while (freq > 0) {
freq--; freq--;
} }