prodriguez/choco-chip8
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fixed ticks to delay timer conversion

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This commit is contained in:
Pablo Rodriguez
2025-03-14 01:21:12 -04:00
parent 3c30d2a04f
commit af39b2ab07
2 changed files with 5 additions and 4 deletions
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8
Interpreter.cpp
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@@ -145,16 +145,16 @@ void Interpreter::tick() {
case 0xF000: // several unique instructions case 0xF000: // several unique instructions
switch(inst & 0xF0FF) { switch(inst & 0xF0FF) {
case 0xF007: // FX07 - read timer register case 0xF007: // FX07 - read timer register
mvReg[iRegDst] = (mvSpecialReg[SR_T1] + mcTicksPerSecond - 1) / mcTicksPerSecond; mvReg[iRegDst] = (mvSpecialReg[SR_T1] * scTimerFreq + (mcTicksPerSecond - 1)) / mcTicksPerSecond;
break; break;
case 0xF015: // FX15 - set timer register case 0xF015: // FX15 - set timer register
mvSpecialReg[SR_T1] = mcTicksPerSecond * mvReg[iRegDst]; mvSpecialReg[SR_T1] = (mcTicksPerSecond * mvReg[iRegDst]) / scTimerFreq;
break; break;
case 0xF018: // FX18 - set sound timer register case 0xF018: // FX18 - set sound timer register
if(mvSpecialReg[SR_T1] == 0 && mvReg[iRegDst] != 0) { if(mvSpecialReg[SR_T2] == 0 && mvReg[iRegDst] != 0) {
mrBuzzer.on(); mrBuzzer.on();
} }
mvSpecialReg[SR_T1] = mcTicksPerSecond * mvReg[iRegDst]; mvSpecialReg[SR_T2] = (mcTicksPerSecond * mvReg[iRegDst]) / scTimerFreq;
break; break;
case 0xF01E: // FX1E - add to I case 0xF01E: // FX1E - add to I
mvSpecialReg[SR_I] += mvReg[iRegDst]; mvSpecialReg[SR_I] += mvReg[iRegDst];

1
Interpreter.hpp
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@@ -16,6 +16,7 @@ private:
public: public:
constexpr static sreg_t scLowRestFontAddr = 0x0000; constexpr static sreg_t scLowRestFontAddr = 0x0000;
constexpr static sreg_t scResetVector = 0x0200; constexpr static sreg_t scResetVector = 0x0200;
constexpr static sreg_t scTimerFreq = 60;
constexpr static size_t scMemorySize = 4096; constexpr static size_t scMemorySize = 4096;
enum { enum {