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* very shitty implementation of save RAM. requires an existing save file for now.

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* refine some SPI code, too. mostly removing a useless function.
* support 16bit accesses to DMAxCNT registers.
This commit is contained in:
StapleButter
2017-01-31 17:34:17 +01:00
parent c3e2f7ad9b
commit 516bc30ee3
6 changed files with 257 additions and 48 deletions
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27
SPI.cpp
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@ -270,7 +270,7 @@ void Write(u8 val, u32 hold)
namespace SPI
{
u16 CNT;
u16 Cnt;
u32 CurDevice;
@ -283,29 +283,24 @@ void Init()
void Reset()
{
CNT = 0;
Cnt = 0;
SPI_Firmware::Reset();
SPI_Powerman::Reset();
}
u16 ReadCnt()
{
return CNT;
}
void WriteCnt(u16 val)
{
CNT = val & 0xCF03;
Cnt = (Cnt & 0x0080) | (val & 0xCF03);
if (val & 0x0400) printf("!! CRAPOED 16BIT SPI MODE\n");
}
u8 ReadData()
{
if (!(CNT & (1<<15))) return 0;
if (!(Cnt & (1<<15))) return 0;
switch (CNT & 0x0300)
switch (Cnt & 0x0300)
{
case 0x0000: return SPI_Powerman::Read();
case 0x0100: return SPI_Firmware::Read();
@ -315,18 +310,18 @@ u8 ReadData()
void WriteData(u8 val)
{
if (!(CNT & (1<<15))) return;
if (!(Cnt & (1<<15))) return;
// TODO: take delays into account
switch (CNT & 0x0300)
switch (Cnt & 0x0300)
{
case 0x0000: SPI_Powerman::Write(val, CNT&(1<<11)); break;
case 0x0100: SPI_Firmware::Write(val, CNT&(1<<11)); break;
default: printf("SPI to unknown device %04X %02X\n", CNT, val); break;
case 0x0000: SPI_Powerman::Write(val, Cnt&(1<<11)); break;
case 0x0100: SPI_Firmware::Write(val, Cnt&(1<<11)); break;
default: printf("SPI to unknown device %04X %02X\n", Cnt, val); break;
}
if (CNT & (1<<14))
if (Cnt & (1<<14))
NDS::TriggerIRQ(1, NDS::IRQ_SPI);
}