I'm trying to write some code to run on a Pi Pico to interface with a SNES Mini controller & provide a normal gamepad output (HID device style).
So I finished the following MicroPython code before realising MicroPython (on the Pico) can't do any sort of HID device stuff:
import machine
import time
GAMEPAD_ADDR = 0x52
FREQ_MOD = 3
i2c = machine.I2C(0, scl=machine.Pin( 17), sda=machine.Pin(16), freq=int(100000 * FREQ_MOD))
i2c.writeto_mem(GAMEPAD_ADDR, 0x40, b'\x00')
time.sleep(0.05)
def reconnect(): i2c.writeto_mem(GAMEPAD_ADDR, 0x40, b'\x00') time.sleep(0.05 / FREQ_MOD)
while True: i2c.writeto(GAMEPAD_ADDR, b'\x00') time.sleep(0.05 / FREQ_MOD) data = i2c.readfrom(GAMEPAD_ADDR, 6) if (data[1] == 255): reconnect() else: dataA = 0x17 + (0x17 ^ data[4]) dataB = 0x17 + (0x17 ^ data[5]) if not (dataB & ~0b11111110): print("UP") if not (dataB & ~0b11111101): print("LEFT") if not (dataA & ~0b10111111): print("DOWN") if not (dataA & ~0b01111111): print("RIGHT") if not (dataA & ~0b11011111): print("L") if not (dataA & ~0b11111101): print("R") if not (dataB & ~0b11101111): print("A") if not (dataB & ~0b10111111): print("B") if not (dataB & ~0b11011111): print("Y") if not (dataB & ~0b11110111): print("X") if not (dataA & ~0b11101111): print("SELECT") if not (dataA & ~0b11111011): print("START")Which isn't neat but it works, (the reconnect bit is a little weird not sure why it disconnects & needs the set up byte again), it'll print out whichever key is being pressed.
So far I've got the following CircuitPython code:
import time
import board
import busio
from adafruit_bus_device.i2c_device import I2CDevice
FREQ_MOD = 3
i2c = busio.I2C(board.GP17, board.GP16, frequency=30000)
while not i2c.try_lock(): pass
time.sleep(0.01)
print([hex(x) for x in i2c.scan()])
time.sleep(0.01)
data = bytearray(6)
i2c.writeto(0x52, bytes([0x40, 0x00]))
time.sleep(0.01)
while True: i2c.writeto_then_readfrom(0x52, bytes([0x00]), data, out_start=0) print(data) time.sleep(1)
i2c.deinit()But I'm not able to do the setup bit correctly so it just keeps reading bytearray(b'\xff\xff\xff\xff\xff\xff').
I think I just need the CircuitPython equivalent to MicroPython's i2c.writeto_mem(0x52, 0x40, b'\x00') then I should be fine from there.
It could also be that the writeto_then_readfrom isn't equivalent to what's done in the MicroPython.
Thanks
1 Answer
Just worked it out immediately after posting - the writeto_then_readfrom isn't what I wanted to use.
while True: i2c.writeto(0x52, bytes([0x00])) time.sleep(0.01) i2c.readfrom_into(0x52, data) print(data) time.sleep(1)This gets CircuitPython behaving in the way MicroPython was (but seemingly without the random disconnect, which is nice).
