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import os
import sys
import threading
import time
import periphery
from .test import ptest, pokay, passert, AssertRaises
if sys.version_info[0] == 3:
raw_input = input
import queue
else:
import Queue as queue
line_input = None
line_output = None
def test_arguments():
ptest()
# Invalid open types
with AssertRaises("invalid open types", TypeError):
periphery.GPIO("abc", "out")
with AssertRaises("invalid open types", TypeError):
periphery.GPIO(100, 100)
# Invalid direction
with AssertRaises("invalid direction", ValueError):
periphery.GPIO(100, "blah")
def test_open_close():
ptest()
# Open non-existent GPIO (export should fail with EINVAL)
with AssertRaises("non-existent GPIO", periphery.GPIOError):
periphery.GPIO(9999, "in")
# Open legitimate GPIO
gpio = periphery.GPIO(line_output, "in")
passert("property line", gpio.line == line_output)
passert("direction is in", gpio.direction == "in")
passert("fd >= 0", gpio.fd >= 0)
# Set invalid direction
with AssertRaises("set invalid direction", ValueError):
gpio.direction = "blah"
# Set invalid edge
with AssertRaises("set invalid edge", ValueError):
gpio.edge = "blah"
# Unsupported property bias
with AssertRaises("unsupported property bias", NotImplementedError):
_ = gpio.bias
with AssertRaises("unsupported property bias", NotImplementedError):
gpio.bias = "pull_up"
# Unsupported property drive
with AssertRaises("unsupported property drive", NotImplementedError):
_ = gpio.drive
with AssertRaises("unsupported property drive", NotImplementedError):
gpio.drive = "open_drain"
# Unsupported proprety
with AssertRaises("unsupported property chip_fd", NotImplementedError):
_ = gpio.chip_fd
# Unsupported method
with AssertRaises("unsupported method", NotImplementedError):
gpio.read_event()
# Set direction out, check direction out, check value low
gpio.direction = "out"
passert("direction is out", gpio.direction == "out")
passert("value is low", gpio.read() == False)
# Set direction low, check direction out, check value low
gpio.direction = "low"
passert("direction is out", gpio.direction == "out")
passert("value is low", gpio.read() == False)
# Set direction high, check direction out, check value high
gpio.direction = "high"
passert("direction is out", gpio.direction == "out")
passert("ivalue is high", gpio.read() == True)
# Set inverted true, check inverted
gpio.inverted = True
passert("inverted is True", gpio.inverted == True)
# Set inverted false, check inverted
gpio.inverted = False
passert("inverted is False", gpio.inverted == False)
# Set direction in, check direction in
gpio.direction = "in"
passert("direction is in", gpio.direction == "in")
# Set edge none, check edge none
gpio.edge = "none"
passert("edge is none", gpio.edge == "none")
# Set edge rising, check edge rising
gpio.edge = "rising"
passert("edge is rising", gpio.edge == "rising")
# Set edge falling, check edge falling
gpio.edge = "falling"
passert("edge is falling", gpio.edge == "falling")
# Set edge both, check edge both
gpio.edge = "both"
passert("edge is both", gpio.edge == "both")
# Set edge none, check edge none
gpio.edge = "none"
passert("edge is none", gpio.edge == "none")
gpio.close()
def test_loopback():
ptest()
# Open in and out lines
gpio_in = periphery.GPIO(line_input, "in")
gpio_out = periphery.GPIO(line_output, "out")
# Drive out low, check in low
print("Drive out low, check in low")
gpio_out.write(False)
passert("value is low", gpio_in.read() == False)
# Drive out high, check in high
print("Drive out high, check in high")
gpio_out.write(True)
passert("value is high", gpio_in.read() == True)
# Wrapper for running poll() in a thread
def threaded_poll(gpio, timeout):
ret = queue.Queue()
def f():
ret.put(gpio.poll(timeout))
thread = threading.Thread(target=f)
thread.start()
return ret
# Check poll falling 1 -> 0 interrupt
print("Check poll falling 1 -> 0 interrupt")
gpio_in.edge = "falling"
poll_ret = threaded_poll(gpio_in, 5)
time.sleep(0.5)
gpio_out.write(False)
passert("gpio_in polled True", poll_ret.get() == True)
passert("value is low", gpio_in.read() == False)
# Check poll rising 0 -> 1 interrupt
print("Check poll rising 0 -> 1 interrupt")
gpio_in.edge = "rising"
poll_ret = threaded_poll(gpio_in, 5)
time.sleep(0.5)
gpio_out.write(True)
passert("gpio_in polled True", poll_ret.get() == True)
passert("value is high", gpio_in.read() == True)
# Set edge to both
gpio_in.edge = "both"
# Check poll falling 1 -> 0 interrupt
print("Check poll falling 1 -> 0 interrupt")
poll_ret = threaded_poll(gpio_in, 5)
time.sleep(0.5)
gpio_out.write(False)
passert("gpio_in polled True", poll_ret.get() == True)
passert("value is low", gpio_in.read() == False)
# Check poll rising 0 -> 1 interrupt
print("Check poll rising 0 -> 1 interrupt")
poll_ret = threaded_poll(gpio_in, 5)
time.sleep(0.5)
gpio_out.write(True)
passert("gpio_in polled True", poll_ret.get() == True)
passert("value is high", gpio_in.read() == True)
# Check poll timeout
print("Check poll timeout")
passert("gpio_in polled False", gpio_in.poll(1) == False)
# Check poll falling 1 -> 0 interrupt with the poll_multiple() API
print("Check poll falling 1 -> 0 interrupt with poll_multiple()")
gpio_out.write(False)
gpios_ready = periphery.GPIO.poll_multiple([gpio_in], 1)
passert("gpios ready is gpio_in", gpios_ready == [gpio_in])
passert("value is low", gpio_in.read() == False)
# Check poll rising 0 -> 1 interrupt with the poll_multiple() API
print("Check poll rising 0 -> 1 interrupt with poll_multiple()")
gpio_out.write(True)
gpios_ready = periphery.GPIO.poll_multiple([gpio_in], 1)
passert("gpios ready is gpio_in", gpios_ready == [gpio_in])
passert("value is high", gpio_in.read() == True)
# Check poll timeout
print("Check poll timeout with poll_multiple()")
gpios_ready = periphery.GPIO.poll_multiple([gpio_in], 1)
passert("gpios ready is empty", gpios_ready == [])
gpio_in.close()
gpio_out.close()
def test_interactive():
ptest()
gpio = periphery.GPIO(line_output, "out")
print("Starting interactive test. Get out your multimeter, buddy!")
raw_input("Press enter to continue...")
# Check tostring
print("GPIO description: {}".format(str(gpio)))
passert("interactive success", raw_input("GPIO description looks ok? y/n ") == "y")
# Drive GPIO out low
gpio.write(False)
passert("interactive success", raw_input("GPIO out is low? y/n ") == "y")
# Drive GPIO out high
gpio.write(True)
passert("interactive success", raw_input("GPIO out is high? y/n ") == "y")
# Drive GPIO out low
gpio.write(False)
passert("interactive success", raw_input("GPIO out is low? y/n ") == "y")
gpio.close()
if __name__ == "__main__":
if os.environ.get("CI") == "true":
test_arguments()
sys.exit(0)
if len(sys.argv) < 3:
print("Usage: python -m tests.test_gpio <GPIO #1> <GPIO #2>")
print("")
print("[1/4] Argument test: No requirements.")
print("[2/4] Open/close test: GPIO #2 should be real.")
print("[3/4] Loopback test: GPIOs #1 and #2 should be connected with a wire.")
print("[4/4] Interactive test: GPIO #2 should be observed with a multimeter.")
print("")
print("Hint: for Raspberry Pi 3,")
print("Use GPIO 17 (header pin 11) and GPIO 27 (header pin 13),")
print("connect a loopback between them, and run this test with:")
print(" python -m tests.test_gpio_sysfs 17 27")
print("")
sys.exit(1)
line_input = int(sys.argv[1])
line_output = int(sys.argv[2])
test_arguments()
pokay("Arguments test passed.")
test_open_close()
pokay("Open/close test passed.")
test_loopback()
pokay("Loopback test passed.")
test_interactive()
pokay("Interactive test passed.")
pokay("All tests passed!")
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