BYTE CPUMem::read(WORD wAddress)
{
if (wAddress < 0x2000) {
return memory[wAddress];
} else if (wAddress >= 0x8000 && wAddress < 0xC000) {
return pPrgRomBank1[wAddress-0x8000];
} else if (wAddress >= 0xC000 && wAddress <= 0xFFFF) {
return pPrgRomBank2[wAddress-0xC000];
} else {
if (wAddress >= 0x2000 && wAddress <= 0x3FFF) {
// Remove the mirroring and use the base addresses
return ppuRegRead(0x2000 | (wAddress&7));
} else if (wAddress == SPRDMA) {
// TODO: Unknown results reading from SPRDMA..
return openBus();
} else if (wAddress == 0x4015)
{
NOT_IMPLEMENTED;
return 0;
}
else if (wAddress == 0x4016)
{
return 0;
}
}
// Bogus read
NOT_IMPLEMENTED;
return 0;
}
//main program
int main(int argc, char** argv)
{
//open bus i2c
int i2c_hdl;
char *i2c_dev = "/dev/i2c-1";
if((i2c_hdl = openBus(i2c_dev)) < 0) //fail opening
{
perror("Failed opening i2c device");
exit(1);
}
//write register
unsigned char buff[10];
buff[0] = 0x31;
buff[1] = 0x0b;
if(writeBytes(i2c_hdl, 0x53, buff, 2)>0)
{
printf("write 1 ok\n");
/*
buff[0] = 0x0b;
if(writeBytes(i2c_hdl, 0x53, buff, 1)>0)
printf("write 2 ok\n");
*/
}
//close bus
closeBus(i2c_hdl);
return 0;
}
u8 Cpu::mmio_read(u8 pos) {
switch(pos) {
case 1: return read_port_3F();
case 2: return read_port_7E();
case 3: return read_port_7F();
case 6: return read_port_DC();
case 7: return read_port_DD();
case 8: return read_port_GG_0x0();
case 15: return openBus();
}
}
BYTE CPUMem::ppuRegRead(WORD wAddress) {
switch (wAddress) {
case PPUCTRL:
return openBus(); // The PPU control register is write only
case PPUMASK:
return openBus();
case PPUSTATUS:
return pPpu->readStatus();
case OAMADDR:
return openBus();
case OAMDATA:
return pPpu->readOAMData();
case PPUSCROLL:
NOT_IMPLEMENTED; // I think this is open bus?!
break;
case PPUDATA:
return pPpu->readPPUData();
}
NOT_IMPLEMENTED;
return 0;
}
//bus i2c init
int I2C_Init_Bus(char *dev_i2c_name, unsigned char *statusPeripheralOutput)
{
int i2c_hdlx;
if((i2c_hdlx = openBus(dev_i2c_name)) < 0) //fail opening
{
printf("Failed opening i2c device");
//return errno;
*statusPeripheralOutput &= ~(1<<BIT_I2C_BUS_READY);
}
else
{
*statusPeripheralOutput |= (1<<BIT_I2C_BUS_READY);
#if VERBOSE==1
printf("i2c port opened\r\n");
#endif
}
return i2c_hdlx;
}
u8 Cpu::read_port_3F() {
return openBus();
}
