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Implement solar sensor processing

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This commit is contained in:
Raphaël Zumer 2019-12-10 17:43:25 -05:00
parent 9128517b90
commit f6cd66e5b1
2 changed files with 70 additions and 16 deletions
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67
src/GBACart.cpp
View File

@ -461,15 +461,6 @@ const char SOLAR_SENSOR_GAMECODES[10][5] =
};
struct GPIO
{
bool has_solar_sensor;
u16 data;
u16 direction;
u16 control;
};
bool CartInserted;
u8* CartROM;
u32 CartROMSize;
@ -503,6 +494,7 @@ void Reset()
CartGPIO = {};
GBACart_SRAM::Reset();
GBACart_SolarSensor::Reset();
}
void DoSavestate(Savestate* file)
@ -578,7 +570,7 @@ void WriteGPIO(u32 addr, u16 val)
case 0xC4:
CartGPIO.data &= ~CartGPIO.direction;
CartGPIO.data |= val & CartGPIO.direction;
// TODO: process pins
if (CartGPIO.has_solar_sensor) GBACart_SolarSensor::Process(&CartGPIO);
break;
case 0xC6:
CartGPIO.direction = val;
@ -593,17 +585,60 @@ void WriteGPIO(u32 addr, u16 val)
// write the GPIO values in the ROM (if writable)
if (CartGPIO.control & 1)
{
*(u16*)&CartROM[addr] = CartGPIO.data;
*(u16*)&CartROM[addr + 2] = CartGPIO.direction;
*(u16*)&CartROM[addr + 4] = CartGPIO.control;
*(u16*)&CartROM[0xC4] = CartGPIO.data;
*(u16*)&CartROM[0xC6] = CartGPIO.direction;
*(u16*)&CartROM[0xC8] = CartGPIO.control;
}
else
{
// GBATEK: "in write-only mode, reads return 00h (or [possibly] other data (...))"
// ambiguous, but mGBA sets ROM to 00h when switching to write-only, so do the same
*(u16*)&CartROM[addr] = 0;
*(u16*)&CartROM[addr + 2] = 0;
*(u16*)&CartROM[addr + 4] = 0;
*(u16*)&CartROM[0xC4] = 0;
*(u16*)&CartROM[0xC6] = 0;
*(u16*)&CartROM[0xC8] = 0;
}
}
}
namespace GBACart_SolarSensor
{
bool LightEdge;
u8 LightCounter;
u8 LightSample;
u8 LightLevel; // 0-10 range
// levels from mGBA
const int GBA_LUX_LEVELS[11] = { 0, 5, 11, 18, 27, 42, 62, 84, 109, 139, 183 };
#define LIGHT_VALUE (0xFF - (0x16 + GBA_LUX_LEVELS[LightLevel]))
void Reset()
{
LightEdge = false;
LightCounter = 0;
LightSample = 0xFF;
LightLevel = 0;
}
void Process(GBACart::GPIO* gpio)
{
if (gpio->data & 4) return; // Boktai chip select
if (gpio->data & 2) // Reset
{
LightCounter = 0;
LightSample = LIGHT_VALUE;
}
if (gpio->data & 1 && LightEdge) LightCounter++;
LightEdge = !(gpio->data & 1);
bool sendBit = LightCounter >= LightSample;
if (gpio->control & 1)
{
gpio->data = (gpio->data & gpio->direction) | ((sendBit << 3) & ~gpio->direction & 0xF);
}
}

19
src/GBACart.h
View File

@ -43,6 +43,14 @@ void Write32(u32 addr, u32 val);
namespace GBACart
{
struct GPIO
{
bool has_solar_sensor;
u16 data;
u16 direction;
u16 control;
};
extern bool CartInserted;
extern u8* CartROM;
extern u32 CartROMSize;
@ -59,4 +67,15 @@ void WriteGPIO(u32 addr, u16 val);
}
namespace GBACart_SolarSensor
{
extern u8 LightLevel;
void Reset();
void Process(GBACart::GPIO* gpio);
}
#endif // GBACART_H