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sh4: make RTC R64CNT tick #2547

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sh4: make RTC R64CNT tick #2547

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10 changes: 9 additions & 1 deletion core/hw/sh4/modules/rtc.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4,17 +4,25 @@
#include "hw/hwreg.h"
#include "hw/sh4/sh4_mmr.h"
#include "modules.h"
#include "hw/sh4/sh4_sched.h"

RTCRegisters rtc;

// R64CNT is a free-running 7-bit counter incremented at 128 Hz: bit 0 is the
// 64 Hz bit and bit 6 the 1 Hz bit, so it wraps once per second.
static u8 read_R64CNT(u32 addr)
{
return (u8)((sh4_sched_now64() / (SH4_MAIN_CLOCK / 128)) & 0x7F);
}

void RTCRegisters::init()
{
super::init();

// NAOMI reads from at least RTC_R64CNT

//RTC R64CNT 0xFFC80000 0x1FC80000 8 Held Held Held Held Pclk
setReadOnly<RTC_R64CNT_addr, u8>();
setReadOnly<RTC_R64CNT_addr, u8>(read_R64CNT);

//RTC RSECCNT H'FFC8 0004 H'1FC8 0004 8 Held Held Held Held Pclk
setRW<RTC_RSECCNT_addr, u8, 0x7f>();
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