Play-/Source/Timer.cpp

#include <stdio.h>
#include "Timer.h"
#include "Log.h"

#define LOG_NAME ("timer")

CTimer::CTimer(CINTC& intc) :
m_intc(intc)
{
    Reset();
}

CTimer::~CTimer()
{

}

void CTimer::Reset()
{
	memset(m_Timer, 0, sizeof(TIMER) * 4);
}

void CTimer::Count(unsigned int nCycles)
{
    for(unsigned int i = 0; i < 4; i++)
    {
        TIMER* pTimer = &m_Timer[i];

        if(!(pTimer->nMODE & 0x80)) continue;

        uint32 nPrevious	= pTimer->nCOUNT;
        uint32 nNext		= pTimer->nCOUNT;

        switch(pTimer->nMODE & 0x03)
        {
        case 0x00:
        case 0x03:
            nNext += nCycles;
            break;
        case 0x01:
            nNext += nCycles * 16;
            break;
        case 0x02:
            nNext += nCycles * 256;
            break;
        }

        uint32 nCompare = (pTimer->nCOMP == 0) ? 0x10000 : pTimer->nCOMP;

        //Check if it hit the reference value
        if((nPrevious < nCompare) && (nNext >= nCompare))
        {
            pTimer->nMODE |= 0x400;
        }

        pTimer->nCOUNT = nNext;

//		if(pTimer->nCOUNT >= 0xFFFF)
//		{
//			pTimer->nMODE |= 0x800;
//			pTimer->nCOUNT &= 0xFFFF;
//		}

        if(i == 2)
        {
            uint32 nMask;
            nMask = (pTimer->nMODE & 0x300) << 2;
            if((pTimer->nMODE & nMask) != 0)
            {
                m_intc.AssertLine(CINTC::INTC_LINE_TIMER2);
            }
        }
    }
}

uint32 CTimer::GetRegister(uint32 nAddress)
{
	unsigned int nTimerId;

	DisassembleGet(nAddress);

	nTimerId = (nAddress >> 11) & 0x3;

	switch(nAddress & 0x7FF)
	{
	case 0x00:
		return m_Timer[nTimerId].nCOUNT & 0xFFFF;
		break;
	case 0x04:
	case 0x08:
	case 0x0C:
		break;

	case 0x10:
		return m_Timer[nTimerId].nMODE;
		break;
	case 0x14:
	case 0x18:
	case 0x1C:
		break;

	case 0x20:
		return m_Timer[nTimerId].nCOMP;
		break;
	case 0x24:
	case 0x28:
	case 0x2C:
		break;

	case 0x30:
		return m_Timer[nTimerId].nHOLD;
		break;
	case 0x34:
	case 0x38:
	case 0x3C:
		break;

	default:
        CLog::GetInstance().Print(LOG_NAME, "Read an unhandled IO port (0x%0.8X).\r\n", nAddress);
		break;
	}

	return 0;
}

void CTimer::SetRegister(uint32 nAddress, uint32 nValue)
{
	unsigned int nTimerId;

	DisassembleSet(nAddress, nValue);

	nTimerId = (nAddress >> 11) & 0x3;

	switch(nAddress & 0x7FF)
	{
	case 0x00:
		m_Timer[nTimerId].nCOUNT = nValue & 0xFFFF;
		break;
	case 0x04:
	case 0x08:
	case 0x0C:
		break;

	case 0x10:
		m_Timer[nTimerId].nMODE &= ~(nValue & 0xC00);
		m_Timer[nTimerId].nMODE &= 0xC00;
		m_Timer[nTimerId].nMODE |= nValue & ~0xC00;
		break;
	case 0x14:
	case 0x18:
	case 0x1C:
		break;

	case 0x20:
		m_Timer[nTimerId].nCOMP = nValue & 0xFFFF;
		break;
	case 0x24:
	case 0x28:
	case 0x2C:
		break;

	case 0x30:
		m_Timer[nTimerId].nHOLD = nValue & 0xFFFF;
		break;
	case 0x34:
	case 0x38:
	case 0x3C:
		break;

	default:
		CLog::GetInstance().Print(LOG_NAME, "Wrote to an unhandled IO port (0x%0.8X, 0x%0.8X).\r\n", nAddress, nValue);
		break;
	}
}

void CTimer::DisassembleGet(uint32 nAddress)
{
	unsigned int nTimerId;

	nTimerId = (nAddress >> 11) & 0x3;

	switch(nAddress & 0x7FF)
	{
	case 0x00:
		CLog::GetInstance().Print(LOG_NAME, "= T%i_COUNT\r\n", nTimerId);
		break;

	case 0x10:
		CLog::GetInstance().Print(LOG_NAME, "= T%i_MODE\r\n", nTimerId);
		break;

	case 0x20:
		CLog::GetInstance().Print(LOG_NAME, "= T%i_COMP\r\n", nTimerId);
		break;

	case 0x30:
		CLog::GetInstance().Print(LOG_NAME, "= T%i_HOLD\r\n", nTimerId);
		break;
	}
}

void CTimer::DisassembleSet(uint32 nAddress, uint32 nValue)
{
	unsigned int nTimerId;

	nTimerId = (nAddress >> 11) & 0x3;

	switch(nAddress & 0x7FF)
	{
	case 0x00:
		CLog::GetInstance().Print(LOG_NAME, "T%i_COUNT = 0x%0.8X\r\n", nTimerId, nValue);
		break;

	case 0x10:
		CLog::GetInstance().Print(LOG_NAME, "T%i_MODE = 0x%0.8X\r\n", nTimerId, nValue);
		break;

	case 0x20:
		CLog::GetInstance().Print(LOG_NAME, "T%i_COMP = 0x%0.8X\r\n", nTimerId, nValue);
		break;

	case 0x30:
		CLog::GetInstance().Print(LOG_NAME, "T%i_HOLD = 0x%0.8X\r\n", nTimerId, nValue);
		break;
	}
}