Issue Description

Trying to load ROMs larger than ~200 KBs in size causes a crash before emulation can even start, logging an error in the read_rom_to_ram function before (presumably) the ESP32's crash handler resets the device.

Theories on why this happens

The SD Card API functions (specifically the File.readBytes method) expects a char* (aka int8_t*) as a buffer to write the file data to, but Peanut-GB wants the ROM to be an array of uint8_ts.

Since I'm a bad programmer this was my solution:

// rom data is read to char* readRom
uint8_t *rom = (uint8_t*)readRom;
// return rom to Peanut-GB

I think this somehow breaks when ROMs are too big, where loading the ROM into RAM exceeds the Cardputer's 512 KB of SRAM. At the same time, I only log that message when the read_rom_to_ram function returns NULL, so the function is definitely reaching its end.

I don't really have the time or energy to look into or debug this much since I'm busy with school right now, but since other people seem to be interested in Game Boy emulation on the Cardputer I think this would be a good place for other people (who probably have a better understanding of C than me) to potentially fix this issue.