Does the SPI interface work for anyone?



  • I abandoned a SyPy project because I can't get the SPI to work even though the peripheral works fine on an Adafruit Feather. I thought this might be due to the Sigfox component hogging the resource. I have since borrowed a WyPy and I still can't get it to work.
    Does anyone have a third party peripheral working with the SPI interface using non-default pins?



  • My test code is:

    from machine import Pin
    from machine import SPI
    
    #SPI  pins.
    SPI_CS   = 'P23'
    SPI_MOSI = 'P11'
    SPI_MISO = 'P22'
    SPI_CLK  = 'P10'
    
    REGISTER_TEST      = 0x00
    REGISTER_WRITE_BIT = 0x80
    REGISTER_READ_MASK = 0x7f
    
    SPI_LOW  = 0
    SPI_HIGH = 1
    
    spi_cs = Pin(SPI_CS, mode = Pin.OUT)
    spi_cs.value(SPI_HIGH)
    spi = SPI(0, mode=SPI.MASTER, baudrate=1000000, pins=(SPI_CLK, SPI_MOSI, SPI_MISO))
    
    # Test register should return whatever value is written to it.
    for data in range(0, 0x7e):
        spi_cs.value(SPI_LOW)
        print("Writing 0x{:02x} to register 0x{:02x}".format(data, REGISTER_TEST))
        wbuf = bytes([REGISTER_TEST | REGISTER_WRITE_BIT, data])
        # Write data into register.
        spi.write(wbuf)
        # Read data from register.
        #spi.write(bytes([REGISTER_TEST & REGISTER_READ_MASK]))
        #rbuf=spi.read(1)
        tbuf = bytes([REGISTER_TEST & REGISTER_READ_MASK])
        rbuf = spi.read(1, write=tbuf[0])
        #numRead = spi.readinto(rbuf, write=tbuf[0])
        spi_cs.value(SPI_HIGH)
        print("Read 0x{:02x} from register 0x{:02x}".format(rbuf[0], REGISTER_TEST))
    


  • @danielm My init, using your pins, is:

    SPI_CS   = 'P10'
    SPI_MOSI = 'P23'
    SPI_MISO = 'P21'
    SPI_CLK  = 'P22'
    
    SPI_LOW  = 0
    SPI_HIGH = 1
    
    spi_cs = Pin(SPI_CS, mode = Pin.OUT)
    spi_cs.value(SPI_HIGH)
    spi = SPI(0, mode=SPI.MASTER, baudrate=1000000, pins=(SPI_CLK, SPI_MOSI, SPI_MISO))
    


  • @danielm Hi. Still no joy for me. What is your init command like?



  • I successfully used LoPy4 with CLK on P22, MOSI on P23 and MISO on P21.


 

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