def test_input_gpio(self):
"""Simple test to demonstrate input bit-banging on CBUS.
You need a CBUS-capable FTDI (FT232R/FT232H/FT230X/FT231X), whose
EEPROM has been configured to support GPIOs on CBUS0 and CBUS3.
Hard-wiring is required to run this test:
* CBUS0 (input) should be connected to RTS (output)
* CBUS3 (input) should be connected to DTR (output)
"""
ftdi = Ftdi()
ftdi.open_from_url(self.url)
# sanity check: device should support CBUS feature
self.assertEqual(ftdi.has_cbus, True)
eeprom = FtdiEeprom()
eeprom.connect(ftdi)
# sanity check: device should have been configured for CBUS GPIOs
self.assertEqual(eeprom.cbus_mask & 0b1001, 0b1001)
# configure CBUS0 and CBUS3 as input
ftdi.set_cbus_direction(0b1001, 0b0000)
# no output pin available
self.assertRaises(FtdiError, ftdi.set_cbus_gpio, 0)
for cycle in range(40):
rts = bool(cycle & 0x1)
dtr = bool(cycle & 0x2)
ftdi.set_rts(rts)
ftdi.set_dtr(dtr)
# need to inverse logical level as RS232 uses negative logic
cbus = ~ftdi.get_cbus_gpio()
sig = (cbus & 0x1) | ((cbus & 0x8) >> 2)
value = cycle & 0x3
self.assertEqual(value, sig)
def test_230x(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)
ftdi = Ftdi()
ftdi.open_from_url('ftdi:///1')
self.assertEqual(ftdi.has_cbus, True)
vftdi = self.loader.get_virtual_ftdi(1, 1)
vport = vftdi.get_port(1)
# CBUS0: in, CBUS1: out, CBUS2: in, CBUS3: out
# however, only CBUS0 and CBUS1 are mapped as GPIO,
# CBUS2 forced to 1 and CBUS3 not usable as IO
# even if use mask is 1111
eeprom_mask = 0b0011
eeprom_force = 0b0100
cbus_mask = 0b1111
cbus_dir = 0b1010
ftdi.set_cbus_direction(cbus_mask, cbus_dir)
cbus_out = 0b0011
# CBUS0: 1, CBUS1: 1
# however, only CBUS1 is out, so CBUS0 output value should be ignored
ftdi.set_cbus_gpio(cbus_out)
exp_out = cbus_dir & cbus_out
exp_out &= eeprom_mask
exp_out |= eeprom_force
vcbus, vactive = vport.cbus
self.assertEqual(vcbus, exp_out)
self.assertEqual(vactive, eeprom_mask | eeprom_force)
cbus_out = 0b0000
ftdi.set_cbus_gpio(cbus_out)
exp_out = cbus_dir & cbus_out
exp_out &= eeprom_mask
exp_out |= eeprom_force
vcbus, vactive = vport.cbus
self.assertEqual(vcbus, exp_out)
cbus_in = 0b0101
vport.cbus = cbus_in
cbus = ftdi.get_cbus_gpio()
exp_in = cbus_in & eeprom_mask
self.assertEqual(cbus, exp_in)
ftdi.close()
def test_lc231x(self):
"""Check simple GPIO write and read sequence."""
# load custom CBUS config, with:
# CBUS0: GPIO (gpio)
# CBUS1: TXLED
# CBUS2: DRIVE0 (to light up RX green led)
# CBUS3: GPIO (gpio)
# only CBUS0 and CBUS3 are available on LC231X
# CBUS1 is connected to TX led, CBUS2 to RX led
with open('pyftdi/tests/resources/ft231x_cbus.yaml', 'rb') as yfp:
self.loader.load(yfp)
ftdi = Ftdi()
ftdi.open_from_url('ftdi:///1')
self.assertEqual(ftdi.has_cbus, True)
vftdi = self.loader.get_virtual_ftdi(1, 1)
vport = vftdi.get_port(1)
# CBUS0: in, CBUS1: out, CBUS2: in, CBUS3: out
# however, only CBUS0 and CBUS3 are mapped as GPIO,
# CBUS1 not usable as IO, CBUS2 is fixed to low
# even if use mask is 1111
eeprom_mask = 0b1001
eeprom_force_low = 0b0100
cbus_mask = 0b1111
cbus_dir = 0b1010
ftdi.set_cbus_direction(cbus_mask, cbus_dir)
cbus_out = 0b1111
# however, only CBUS0 & 3 are out, so CBUS1/CBUS2 should be ignored
ftdi.set_cbus_gpio(cbus_out)
exp_out = cbus_dir & cbus_out
exp_out &= eeprom_mask
vcbus, vactive = vport.cbus
self.assertEqual(vcbus, exp_out)
self.assertEqual(vactive, eeprom_mask | eeprom_force_low)
cbus_out = 0b0000
ftdi.set_cbus_gpio(cbus_out)
exp_out = cbus_dir & cbus_out
exp_out &= eeprom_mask
vcbus, vactive = vport.cbus
self.assertEqual(vcbus, exp_out)
cbus_in = 0b0101
vport.cbus = cbus_in
cbus = ftdi.get_cbus_gpio()
exp_in = cbus_in & eeprom_mask
self.assertEqual(cbus, exp_in)
ftdi.close()
