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eblot / pyftdi

FTDI device driver written in pure Python
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Accessing GPIO on a device with custom PID #60

Closed nickvanderstel closed 7 years ago

nickvanderstel commented 7 years ago

I see that the Ftdi class has a method to add a device with a custom PID, but how can I use the GpioController class with this device? I have a FT2232H but the PID is 0x8a98 so I'm getting the following error:

ERROR: test_gpio (__main__.GpioTestCase)
Simple test to demonstrate bit-banging.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "gpio.py", line 98, in test_gpio
    gpio.open(mask)
  File "gpio.py", line 47, in open
    self._gpio.open_from_url('ftdi://0x0403:0x8a98/1', direction=out_pins)
  File "/usr/lib/python3.6/site-packages/pyftdi/gpio.py", line 75, in open_from_url
    ftdi.open_bitbang_from_url(url, direction=direction, **kwargs)
  File "/usr/lib/python3.6/site-packages/pyftdi/ftdi.py", line 507, in open_bitbang_from_url
    vendor, product, index, serial, interface = self.get_identifiers(url)
  File "/usr/lib/python3.6/site-packages/pyftdi/ftdi.py", line 305, in get_identifiers
    cls.SCHEME, cls.VENDOR_IDS, cls.PRODUCT_IDS, cls.DEFAULT_VENDOR)
  File "/usr/lib/python3.6/site-packages/pyftdi/usbtools.py", line 359, in parse_url
    raise UsbToolsError('Product ID 0x%04x not supported' % product)
pyftdi.usbtools.UsbToolsError: Product ID 0x8a98 not supported
eblot commented 7 years ago

You need to add the following piece of code:

from pyftdi.ftdi import Ftdi
Ftdi.add_custom_product(Ftdi.DEFAULT_VENDOR, 0x8a98)

before the first call to

GpioController().open_from_url(url, ...)

I should probably add this kind of example to the PyFtdi documentation

nickvanderstel commented 7 years ago

That did the trick. Thanks!

eblot commented 7 years ago

Documentation have been updated in v0.25.3 to make this customization API more explicit.