Open benderscruffy opened 7 years ago
The Motion Pack used in this game contains a Kionix 3-axis accelerometer, and an ATTiny13 MCU.
For the following, I will be calling the VDD35 pin of the GBA slot Pin 1, and GND Pin 32:
The protocol used by the ATTiny13 is a simple 17-state loop, where each state is responsible for outputting 2 bits:
To convert an input acceleration in g's to the 8-bit units of this pack, use the following equation: output_accel = min(0xFE, max(0, int((input_accel 0.660V/g+1.65V) 256 / 3.3V))) These values were obtained from the datasheets of the chips.
The output on each accelerometer axis must be clamped between 0x0 and 0xFE inclusive, as 0xFF is likely reserved for synchronization.
cannot play the game as it is mising the motion pak