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#!/usr/bin/env python3
"""Low-level library to control the CP210x.
"""
__copyright__ = 'Copyright (C) 2019 Theobroma Systems Design und Consulting GmbH'
__license__ = 'MIT'
import usb.core
import usb.util
VENDOR_ID = 0x10c4
PRODUCT_ID = 0xea60
REQTYPE_HOST_TO_DEVICE = 0x40
REQTYPE_DEVICE_TO_HOST = 0xc0
CP210X_VENDOR_SPECIFIC = 0xFF
CP210X_WRITE_LATCH = 0x37E1
CP210X_READ_LATCH = 0x00C2
CP210X_GET_MDMSTS = 0x8
def set_gpio(dev, gpio, value):
# the latch register has 16 bit. the upper 8 bits are the gpio value,
# the lower 8 bit are the write mask.
val = (value << (8 + gpio)) | (1 << gpio)
dev.ctrl_transfer(bmRequestType=REQTYPE_HOST_TO_DEVICE,
bRequest=CP210X_VENDOR_SPECIFIC,
wValue=CP210X_WRITE_LATCH,
wIndex=val)
def get_gpio(dev, gpio):
# Read 1 byte from latch register
data = dev.ctrl_transfer(bmRequestType=REQTYPE_DEVICE_TO_HOST,
bRequest=CP210X_VENDOR_SPECIFIC,
wValue=CP210X_READ_LATCH,
data_or_wLength=1)
return not not (data[0] & (1 << gpio))
def get_modemstatus(dev):
data = dev.ctrl_transfer(bmRequestType=REQTYPE_DEVICE_TO_HOST,
bRequest=CP210X_GET_MDMSTS,
wValue=0,
wIndex=0,
data_or_wLength=1)
# Check CTS line
return ((data[0] >> 4) & 1)
def find_board_list(product_string, serialnumber):
"""
This function returns a list of found CP210x controllers.
If product_string is not None it will be used for filtering.
If serialnumber is not None it will be used for filtering.
"""
try:
kwargs = dict()
kwargs['idVendor'] = VENDOR_ID
kwargs['idProduct'] = PRODUCT_ID
if product_string is not None:
kwargs['product'] = product_string
if serialnumber:
kwargs['serial_number'] = serialnumber
kwargs['find_all'] = True
# Find the devices matching the specified requirements
dev_it = usb.core.find(**kwargs)
# Convert iterator to list and return
devs = list(dev_it)
return devs
except ValueError as e:
if 'langid' in e.message:
raise usb.core.USBError(e.message + "\n" +
"This may be a permission issue. See: \n" +
"https://github.com/pyusb/pyusb/issues/139")
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