def test_gpio_freeze(self):
"""Simple test to demonstrate freeze on close.
For now, it requires a logic analyzer to verify the output,
this is not automatically validated by SW
"""
direction = 0xFF & ~((1 << 4) - 1) # 4 Out, 4 In
gpio = GpioAsyncController()
gpio.configure(self.url,
direction=direction,
frequency=1e3,
initial=0x0)
port = gpio.get_gpio()
# emit a sequence as a visual marker on b3,b2,b1,b0
port.write([x << 4 for x in range(16)])
sleep(0.01)
# write 0b0110 to the port
port.write(0x6 << 4)
sleep(0.001)
# close w/o freeze: all the outputs should be reset (usually 0b1111)
# it might need pull up (or pull down) to observe the change as
# output are not high-Z.
gpio.close()
sleep(0.01)
gpio.configure(self.url,
direction=direction,
frequency=1e3,
initial=0x0)
port = gpio.get_gpio()
# emit a sequence as a visual marker with on b3 and b1
port.write([(x << 4) & 0x90 for x in range(16)])
sleep(0.01)
# write 0b0110 to the port
port.write(0x6 << 4)
sleep(0.01)
# close w/ freeze: outputs should not be reset (usually 0b0110)
gpio.close(True)
def test_gpio_values(self):
"""Simple test to demonstrate bit-banging.
"""
if self.skip_loopback:
raise SkipTest('Skip loopback test on multiport device')
direction = 0xFF & ~((1 << 4) - 1) # 4 Out, 4 In
gpio = GpioAsyncController()
gpio.configure(self.url,
direction=direction,
frequency=1e6,
initial=0x0)
port = gpio.get_gpio() # useless, for API duck typing
# legacy API: peek mode, 1 byte
ingress = port.read()
self.assertIsInstance(ingress, int)
# peek mode always gives a single byte output
ingress = port.read(peek=True)
self.assertIsInstance(ingress, int)
# stream mode always gives a bytes buffer
port.write([0xaa for _ in range(256)])
ingress = port.read(100, peek=False, noflush=False)
self.assertIsInstance(ingress, bytes)
if not VirtLoader:
# the virtual task may sometimes not be triggered soon enough
self.assertGreater(len(ingress), 2)
# direct mode is not available with multi-byte mode
self.assertRaises(ValueError, port.read, 3, True)
ingress = port.read(3)
self.assertIsInstance(ingress, bytes)
if not VirtLoader:
# the virtual task may sometimes not be triggered soon enough
self.assertGreater(len(ingress), 0)
self.assertLessEqual(len(ingress), 3)
port.write(0x00)
port.write(0xFF)
# only 8 bit values are accepted
self.assertRaises(ValueError, port.write, 0x100)
port.write([0x00, 0xFF, 0x00])
port.write(bytes([0x00, 0xFF, 0x00]))
# only 8 bit values are accepted
self.assertRaises(ValueError, port.write, [0x00, 0x100, 0x00])
# check direction API
port.set_direction(0xFF, 0xFF & ~direction)
gpio.close()