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SPU: Hook up DMA reads/writes to RAM

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This commit is contained in:
Connor McLaughlin 2019-09-24 23:55:57 +10:00
parent 575a3b36f5
commit 6aa36c2ead
2 changed files with 26 additions and 5 deletions
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29
src/pse/spu.cpp
View File

@ -75,10 +75,9 @@ void SPU::WriteRegister(u32 offset, u16 value)
case 0x1F801DA8 - SPU_BASE:
{
std::memcpy(&m_ram[m_transfer_address], &value, sizeof(value));
Log_TracePrintf("SPU transfer data register <- 0x%04X (RAM offset 0x%08X)", ZeroExtend32(value),
m_transfer_address);
m_transfer_address = (m_transfer_address + sizeof(value)) & RAM_MASK;
RAMTransferWrite(value);
return;
}
@ -107,11 +106,17 @@ void SPU::WriteRegister(u32 offset, u16 value)
u32 SPU::DMARead()
{
Log_ErrorPrintf("SPU DMA READ");
return UINT32_C(0xFFFFFFFF);
const u16 lsb = RAMTransferRead();
const u16 msb = RAMTransferRead();
return ZeroExtend32(lsb) | (ZeroExtend32(msb) << 16);
}
void SPU::DMAWrite(u32 value) {}
void SPU::DMAWrite(u32 value)
{
// two 16-bit writes to prevent out-of-bounds
RAMTransferWrite(Truncate16(value));
RAMTransferWrite(Truncate16(value >> 16));
}
void SPU::UpdateDMARequest()
{
@ -119,3 +124,17 @@ void SPU::UpdateDMARequest()
const bool request = (mode == RAMTransferMode::DMAWrite || mode == RAMTransferMode::DMARead);
m_dma->SetRequest(DMA::Channel::SPU, request);
}
u16 SPU::RAMTransferRead()
{
u16 value;
std::memcpy(&value, &m_ram[m_transfer_address], sizeof(value));
m_transfer_address = (m_transfer_address + sizeof(value)) & RAM_MASK;
return value;
}
void SPU::RAMTransferWrite(u16 value)
{
std::memcpy(&m_ram[m_transfer_address], &value, sizeof(value));
m_transfer_address = (m_transfer_address + sizeof(value)) & RAM_MASK;
}

2
src/pse/spu.h
View File

@ -82,6 +82,8 @@ private:
#endif
void UpdateDMARequest();
u16 RAMTransferRead();
void RAMTransferWrite(u16 value);
System* m_system = nullptr;
DMA* m_dma = nullptr;