""" Tests a Neotron Expansion card in Slot 3. """ import board import sdcardio import storage import digitalio import busio import os import time led = digitalio.DigitalInOut(board.LED) led.direction = digitalio.Direction.OUTPUT spi = busio.SPI(board.GP18, MOSI=board.GP19, MISO=board.GP16) while not spi.try_lock(): print(".") print("Setting up MCP23S17") # Set up MCP23S17 to select CS1 io_cs = digitalio.DigitalInOut(board.GP17) io_cs.direction = digitalio.Direction.OUTPUT spi.configure(baudrate=8000000, phase=0, polarity=0) io_cs.value = False spi.write(bytes([0x40, 0x00, 0x00])) # GPIOA is outputs io_cs.value = True io_cs.value = False spi.write(bytes([0x40, 0x0D, 0xFF])) # GPIOB has pull-ups io_cs.value = True def set_cs_and_leds(cs, debug_leds, hdd_led): io_cs.value = False debug_leds = (debug_leds ^ 0xF) & 0x0F if hdd_led: hdd_led = 0 else: hdd_led = 1 spi.write(bytes([0x40, 0x12, (debug_leds << 4) | (hdd_led << 3) | cs])); io_cs.value = True set_cs_and_leds(3, 0x00, 0) # nOUTPUT_EN will now activate CS3 noutput_en = digitalio.DigitalInOut(board.GP21) noutput_en.direction = digitalio.Direction.OUTPUT print("Setting up Expansion Card") noutput_en.value = False spi.write(bytes([0x40, 0x00, 0x00])) # GPIOA is outputs noutput_en.value = True scanner = [ 0b00000000, 0b10000000, 0b11000000, 0b11100000, 0b01110000, 0b00111000, 0b00011100, 0b00001110, 0b00000111, 0b00000011, 0b00000001, 0b00000000, ] debug_leds = 0 while True: for leds in scanner: noutput_en.value = False # LEDs are active low, so invert the counter spi.write(bytes([0x40, 0x00, leds ^ 0xFF])); noutput_en.value = True time.sleep(0.05) for leds in reversed(scanner): noutput_en.value = False # LEDs are active low, so invert the counter spi.write(bytes([0x40, 0x00, leds ^ 0xFF])); noutput_en.value = True time.sleep(0.05) debug_leds = (debug_leds + 1) & 0x0F set_cs_and_leds(3, debug_leds, 0) time.sleep(0.2)