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GBA: Implement light sensor GPIO interface with a hardcoded value for the moment

This commit is contained in:
Jeffrey Pfau 2014-12-25 02:38:10 -08:00
parent a6f895da7d
commit 9b1769d67d
2 changed files with 47 additions and 8 deletions
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50
src/gba/gba-gpio.c
View File

@ -24,6 +24,8 @@ static void _gyroReadPins(struct GBACartridgeGPIO* gpio);
static void _rumbleReadPins(struct GBACartridgeGPIO* gpio);
static void _lightReadPins(struct GBACartridgeGPIO* gpio);
static const int RTC_BYTES[8] = {
0, // Force reset
0, // Empty
@ -46,7 +48,13 @@ void GBAGPIOInit(struct GBACartridgeGPIO* gpio, uint16_t* base) {
void GBAGPIOWrite(struct GBACartridgeGPIO* gpio, uint32_t address, uint16_t value) {
switch (address) {
case GPIO_REG_DATA:
gpio->pinState = value;
gpio->pinState &= ~gpio->direction;
gpio->pinState |= value;
if (gpio->readWrite) {
uint16_t old = gpio->gpioBase[0];
old &= ~gpio->direction;
gpio->gpioBase[0] = old | gpio->pinState;
}
_readPins(gpio);
break;
case GPIO_REG_DIRECTION:
@ -58,12 +66,6 @@ void GBAGPIOWrite(struct GBACartridgeGPIO* gpio, uint32_t address, uint16_t valu
default:
GBALog(gpio->p, GBA_LOG_WARN, "Invalid GPIO address");
}
if (gpio->readWrite) {
uint16_t old = gpio->gpioBase[0];
old &= ~gpio->direction;
gpio->gpioBase[0] = old | (value & gpio->direction);
}
}
void GBAGPIOInitRTC(struct GBACartridgeGPIO* gpio) {
@ -92,13 +94,18 @@ void _readPins(struct GBACartridgeGPIO* gpio) {
if (gpio->gpioDevices & GPIO_RUMBLE) {
_rumbleReadPins(gpio);
}
if (gpio->gpioDevices & GPIO_LIGHT_SENSOR) {
_lightReadPins(gpio);
}
}
void _outputPins(struct GBACartridgeGPIO* gpio, unsigned pins) {
if (gpio->readWrite) {
uint16_t old = gpio->gpioBase[0];
old &= gpio->direction;
gpio->gpioBase[0] = old | (pins & ~gpio->direction & 0xF);
gpio->pinState = old | (pins & ~gpio->direction & 0xF);
gpio->gpioBase[0] = gpio->pinState;
}
}
@ -309,6 +316,33 @@ void _rumbleReadPins(struct GBACartridgeGPIO* gpio) {
rumble->setRumble(rumble, gpio->p3);
}
// == Light sensor
void GBAGPIOInitLightSensor(struct GBACartridgeGPIO* gpio) {
gpio->gpioDevices |= GPIO_LIGHT_SENSOR;
gpio->lightCounter = 0;
gpio->lightEdge = false;
}
void _lightReadPins(struct GBACartridgeGPIO* gpio) {
if (gpio->p2) {
// Boktai chip select
return;
}
if (gpio->p1) {
GBALog(0, GBA_LOG_DEBUG, "[SOLAR] Got reset");
gpio->lightCounter = 0;
}
if (gpio->p0 && gpio->lightEdge) {
++gpio->lightCounter;
}
gpio->lightEdge = !gpio->p0;
bool sendBit = gpio->lightCounter >= 0x80;
_outputPins(gpio, sendBit << 3);
GBALog(0, GBA_LOG_DEBUG, "[SOLAR] Output %u with pins %u", gpio->lightCounter, gpio->pinState);
}
// == Serialization
void GBAGPIOSerialize(struct GBACartridgeGPIO* gpio, struct GBASerializedState* state) {

5
src/gba/gba-gpio.h
View File

@ -103,6 +103,9 @@ struct GBACartridgeGPIO {
uint16_t gyroSample;
bool gyroEdge;
int lightCounter : 12;
bool lightEdge;
};
void GBAGPIOInit(struct GBACartridgeGPIO* gpio, uint16_t* gpioBase);
@ -114,6 +117,8 @@ void GBAGPIOInitGyro(struct GBACartridgeGPIO* gpio);
void GBAGPIOInitRumble(struct GBACartridgeGPIO* gpio);
void GBAGPIOInitLightSensor(struct GBACartridgeGPIO* gpio);
struct GBASerializedState;
void GBAGPIOSerialize(struct GBACartridgeGPIO* gpio, struct GBASerializedState* state);
void GBAGPIODeserialize(struct GBACartridgeGPIO* gpio, struct GBASerializedState* state);