Control CP2102N GPIO by using pyusb

cp2102n-qfn20-gpio-ctrlep.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Author: Stefan Agner

import os
import sys
import time
import usb

CP210X_VENDOR_SPECIFIC = 0xFF

CP210X_WRITE_LATCH = 0x37E1

# CP2102N state latch for GPIOs
# GPIO configuration
# b0000 0000 0000 0000
#            |-------- Mask 0->ignore, 1->set
#  |------------------ State Control 0->low, 1->high
#
# E.g. use 0x0404 to set GPIO.2 high, 0x0004 to set it low

# PyUSB control endpoint communication, see also:
# https://github.com/pyusb/pyusb/blob/master/docs/tutorial.rst

def ftdi_set_bitmode(dev, bitmask):
    bmRequestType = usb.util.build_request_type(usb.util.CTRL_OUT,
                                                usb.util.CTRL_TYPE_VENDOR,
                                                usb.util.CTRL_RECIPIENT_DEVICE)

    wIndex = bitmask
    dev.ctrl_transfer(bmRequestType, CP210X_VENDOR_SPECIFIC,
                      wValue=CP210X_WRITE_LATCH, wIndex=wIndex)

def main():
    """Main program"""
    dev = usb.core.find(custom_match = \
            lambda d: \
                d.idVendor==0x10c4 and
                d.idProduct==0xea60 and
                d.serial_number=="0002")

    # Set GPIO.0 high
    ftdi_set_bitmode(dev, 0x0101)

    time.sleep(1)

    # Set GPIO.0 low
    ftdi_set_bitmode(dev, 0x0001)

main()