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jonathanpallantjonathanpallant
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Added some CircuitPython test code.
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‎python-test/audio_sd.py‎

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"""
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Tests an SD Card in the slot, the debug LEDs on the IO chip, and WAV playback
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on the audio codec.
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"""
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import board
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import sdcardio
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import storage
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import digitalio
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import busio
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import time
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from adafruit_bus_device.i2c_device import I2CDevice
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import audiobusio
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import audiocore
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import math
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import array
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import os
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led = digitalio.DigitalInOut(board.LED)
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led.direction = digitalio.Direction.OUTPUT
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i2c = busio.I2C(board.GP15, board.GP14)
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# BCLK, LRC, DATA
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audio = audiobusio.I2SOut(board.GP27, board.GP28, board.GP26)
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spi = busio.SPI(board.GP18, MOSI=board.GP19, MISO=board.GP16)
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class Codec:
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CODEC_ADDR = 0x1A
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LeftLineInputChannelVolumeControl = 0
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RightLineInputChannelVolumeControl = 1
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LeftChannelHeadphoneVolumeControl = 2
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RightChannelHeadphoneVolumeControl = 3
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AnalogAudioPathControl = 4
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DigitalAudioPathControl = 5
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PowerDownControl = 6
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DigitalAudioInterfaceFormat = 7
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SampleRateControl = 8
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DigitalInterfaceActivation = 9
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Reset = 15
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def __init__(self, i2c):
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self.dev = I2CDevice(i2c, self.CODEC_ADDR)
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def write(self, reg_addr, value):
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with self.dev:
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data = bytearray([(reg_addr << 1) | (value >> 8) & 1, value & 0xFF])
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self.dev.write(data)
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print("Configuring CODEC")
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codec = Codec(i2c)
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codec.write(codec.Reset, 0x00)
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codec.write(codec.LeftLineInputChannelVolumeControl, 0x1F) # 0x17 = 0dB, not muted
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codec.write(codec.RightLineInputChannelVolumeControl, 0x1F) # 0x17 = 0dB, not muted
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codec.write(codec.LeftChannelHeadphoneVolumeControl, 0xFF)
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codec.write(codec.RightChannelHeadphoneVolumeControl, 0xFF)
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# STA2 STA1 STA0 STE DAC BYP INSEL MICM MICB
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# 0 0 0 0 1 1 0 1 0 - Line in with bypass (18)
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# 1 0 0 1 1 0 0 1 0 - Line in with sidetone (132)
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# 0 0 0 1 1 0 1 0 1 - Microphone in sidetone (35)
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codec.write(codec.AnalogAudioPathControl, 0x35)
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codec.write(codec.DigitalAudioPathControl, 0x00)
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codec.write(codec.PowerDownControl, 0x00)
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# x x MS LRSWAP LRP IWL1 IWL0 FOR1 FOR0
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# 0 0 0 0 0 0 0 1 0
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codec.write(codec.DigitalAudioInterfaceFormat, 0x02)
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# x CLKOUT CLKIN SR3 SR2 SR1 SR0 BOSR USB/Normal
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# 0 0 0 1 0 0 0 1 1
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codec.write(codec.SampleRateControl, 0x23)
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codec.write(codec.DigitalInterfaceActivation, 0x01)
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print("CODEC configured")
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while not spi.try_lock():
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print(".")
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print("Setting up MCP23S17")
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# Set up MCP23S17 to select CS1
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io_cs = digitalio.DigitalInOut(board.GP17)
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io_cs.direction = digitalio.Direction.OUTPUT
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spi.configure(baudrate=8000000, phase=0, polarity=0)
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io_cs.value = False
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spi.write(bytes([0x40, 0x00, 0x00])) # GPIOA is outputs
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io_cs.value = True
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io_cs.value = False
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spi.write(bytes([0x40, 0x0D, 0xFF])) # GPIOB has pull-ups
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io_cs.value = True
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io_cs.value = False
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cs = 1
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debug_leds = 0x15
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spi.write(bytes([0x40, 0x12, debug_leds << 3 | cs]));
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io_cs.value = True
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wave_file = open("CantinaBand3.wav", "rb")
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wav = audiocore.WaveFile(wave_file)
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print("Playing wav file!")
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audio.play(wav)
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while audio.playing:
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pass
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print("Done!")
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spi.unlock()
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# nOUTPUT_EN will now activate CS1
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cs = board.GP21
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print("Mounting SD card")
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sdcard = sdcardio.SDCard(spi, cs, baudrate=25000000)
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vfs = storage.VfsFat(sdcard)
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storage.mount(vfs, "/sd")
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print("SD card is {} MiB".format(sdcard.count() * 512 // (1024 * 1024)))

‎python-test/card-test.py‎

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