class GpioTest:
"""
"""
def __init__(self):
self._gpio = GpioController()
self._state = 0 # SW cache of the GPIO output lines
def open(self, out_pins):
"""Open a GPIO connection, defining which pins are configured as
output and input"""
out_pins &= 0xFF
url = environ.get('FTDI_DEVICE', 'ftdi://ftdi:2232h/1')
self._gpio.configure(url, direction=out_pins)
def close(self):
"""Close the GPIO connection"""
self._gpio.close()
def set_gpio(self, line, on):
"""Set the level of a GPIO ouput pin.
:param line: specify which GPIO to madify.
:param on: a boolean value, True for high-level, False for low-level
"""
if on:
state = self._state | (1 << line)
else:
state = self._state & ~(1 << line)
self._commit_state(state)
def get_gpio(self, line):
"""Retrieve the level of a GPIO input pin
:param line: specify which GPIO to read out.
:return: True for high-level, False for low-level
"""
value = self._gpio.read_port()
return bool(value & (1 << line))
def _commit_state(self, state):
"""Update GPIO outputs
"""
self._gpio.write_port(state)
# do not update cache on error
self._state = state
def test_baudrate(self):
"""Check simple GPIO write and read sequence."""
# load custom CBUS config, with:
# CBUS0: GPIO (gpio)
# CBUS1: GPIO (gpio)
# CBUS0: DRIVE1 (forced to high level)
# CBUS0: TXLED (eq. to highz for tests)
with open('pyftdi/tests/resources/ft230x_io.yaml', 'rb') as yfp:
self.loader.load(yfp)
gpio = GpioController()
# access to the virtual GPIO port
out_pins = 0xAA
gpio.configure('ftdi://:230x/1', direction=out_pins)
vftdi = self.loader.get_virtual_ftdi(1, 1)
vftdi.get_port(1)
baudrate = 1000000
gpio.set_frequency(baudrate)
gpio.close()
if platform == "win32":
default_url = "ftdi:///4"
devices = UsbTools._find_devices(0x0403, 0x6011, True)
for dev in devices:
if get_interface_index(dev) == 3:
default_url = format_ftdi_url(dev)
else:
default_url = "ftdi:///4"
parser.add_argument('-u', '--url', default=default_url, help='FTDI URL')
# run parser
args = parser.parse_args()
gpio = GpioController()
gpio.configure(args.url, direction=0x0F)
setting = 0x0F # start with 3.3V both VCC_IO1 and VCC_IO2
if args.VCC_IO1 == '3.3V':
# do nothing, already the default
pass
elif args.VCC_IO1 == '2.5V':
setting = setting & 0xFD
elif args.VCC_IO1 == '1.8V':
setting = setting & 0xFE
if args.VCC_IO2 == '3.3V':
# do nothing, already the default
pass
elif args.VCC_IO2 == '2.5V':
setting = setting & 0xF7
