Does the SPI interface work for anyone?

[alidaf]

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?

[danielm]

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

[alidaf]

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

[alidaf]

@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))

[alidaf]

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))

[PaulM]

@alidaf I can help. Pycom's screwed-up and shockingly still-unfixed SPI library implements a read() function that totally ignores the write=parameter. At least this is not as bad as the LTE situation. Here was my workaround for an SD card using it: https://forum.pycom.io/topic/4000/fixed-broken-sdcard-py-library-previously-impossible-to-have-external-spi-usd-card-with-pycom-boards

[Paul Thornton]

Re: @paulm Just to note for others. a fix for the SPI issue has finally been snuck in, should be out in the next RC build