def api_pwm(self, chan, command, option, req_method, req_args):
resp = copy.deepcopy(self.CHIP_INFO)
resp["connected"] = True
# Default the channel to PWM0
# CHIP Pro will support PWM1
cname = "PWM0"
chan = int(chan)
if chan not in [0]: #,1]:
resp["message"] = "Invalid PWM Channel Specified"
return jsonify(resp)
else:
if chan == 0:
cname = "PWM0"
elif chan == 1:
cname = "PWM1"
# Figure out our command
if command == "start" and req_method == 'GET':
# Load the overlay
OM.load(cname)
# Get the arguments
duty_cycle = req_args.get('duty_cycle', 25.0)
frequency = req_args.get('frequency', 200.0)
polarity = req_args.get('polarity', 0)
# Start the PWM
PWM.start(cname, duty_cycle, frequency, polarity)
resp[
"message"] = "Setting {0} to duty cycle: {1}, frequency: {2}, and polarity {3}".format(
cname, duty_cycle, frequency, polarity)
elif command == "stop" and req_method == 'GET':
PWM.stop(chame)
resp["message"] = "Stopping {0}".format(cname)
elif command == "cleanup" and req_method == 'GET':
# TODO: Handle per channel cleanup
PWM.cleanup()
OM.unload(cname)
resp["message"] = "Cleaning up and unloading {0}".format(cname)
elif command == "duty_cycle" and req_method in ['GET', 'PUT', 'POST']:
PWM.set_duty_cycle(cname, float(option))
resp["message"] = "Changing duty cycle on {0} to {1}".format(
cname, option)
elif command == "frequency" and req_method in ['GET', 'PUT', 'POST']:
PWM.set_frequency(cname, float(option))
resp["message"] = "Changing duty cycle on {0} to {1}".format(
cname, option)
return jsonify(resp)
def test_pwm_duty_modified(self):
PWM.start("PWM0", 0)
pwm_test = '/sys/class/pwm/pwmchip0/pwm0/'
assert os.path.exists(pwm_test) == True
duty = open(pwm_test + 'duty_cycle').readline().strip()
period = open(pwm_test + 'period').readline().strip()
assert int(duty) == 0
assert int(period) == 500000
PWM.set_duty_cycle("PWM0", 100)
duty = open(pwm_test + 'duty_cycle').readline().strip()
period = open(pwm_test + 'period').readline().strip()
assert int(duty) == 500000
assert int(period) == 500000
def test_pwm_duty_modified(self):
PWM.start("PWM0", 0)
pwm_test = '/sys/class/pwm/pwmchip0/pwm0/'
assert os.path.exists(pwm_test) == True
duty = open(pwm_test + 'duty_cycle').readline().strip()
period = open(pwm_test + 'period').readline().strip()
assert int(duty) == 0
assert int(period) == 500000
PWM.set_duty_cycle("PWM0", 100)
duty = open(pwm_test + 'duty_cycle').readline().strip()
period = open(pwm_test + 'period').readline().strip()
assert int(duty) == 500000
assert int(period) == 500000
def test_pwm_duty_modified(self):
PWM.start("PWM0", 0)
pwm_test = '/sys/class/pwm/pwmchip0/pwm0'
assert os.path.exists(pwm_test)
duty = open(pwm_test + '/duty_cycle').read()
period = open(pwm_test + '/period').read()
assert int(duty) == 0
assert int(period) == 500000
PWM.set_duty_cycle("PWM0", 100)
duty = open(pwm_test + '/duty_cycle').read()
period = open(pwm_test + '/period').read()
assert int(duty) == 500000
assert int(period) == 500000
PWM.cleanup()
def test_pwm_duty_cycle_invalid_value_string(self):
PWM.start("PWM0", 0)
with pytest.raises(TypeError):
PWM.set_duty_cycle("PWM0", "a")
PWM.cleanup()
def test_pwm_duty_cycle_invalid_value_negative(self):
PWM.start("PWM0", 0)
with pytest.raises(ValueError):
PWM.set_duty_cycle("PWM0", -1)
PWM.cleanup()
def test_pwm_duty_cycle_invalid_key(self):
with pytest.raises(ValueError):
PWM.set_duty_cycle("P9_15", 100)
def test_pwm_duty_cycle_non_setup_key(self):
with pytest.raises(ValueError):
PWM.cleanup()
PWM.set_duty_cycle("PWM0", 100)
# Run the test
try:
GPIO.output("XIO-P0", GPIO.HIGH)
GPIO.output("XIO-P1", GPIO.LOW)
print("Testing duty cycle...")
# Test duty cycle
# for x in range(0,100):
# SPWM.set_duty_cycle("PWM0", x)
# print(x)
# time.sleep(.1)
# Test frequency
PWM.set_duty_cycle("PWM0", 100)
print("Testing frequency at 100% duty")
for f in range(100, 5000, 100):
PWM.set_frequency("PWM0", f)
print(f)
time.sleep(.1)
# Hold at high
print("Holding high")
PWM.set_duty_cycle("PWM0", 100)
PWM.set_frequency("PWM0", 5000)
time.sleep(3)
except:
print("An error hath occurred.")
def test_pwm_duty_cycle_invalid_value_string(self):
PWM.start("PWM0", 0)
with pytest.raises(TypeError):
PWM.set_duty_cycle("PWM0", "a")
PWM.cleanup()
def test_pwm_duty_cycle_invalid_value_negative(self):
PWM.start("PWM0", 0)
with pytest.raises(ValueError):
PWM.set_duty_cycle("PWM0", -1)
PWM.cleanup()
def test_pwm_duty_cycle_invalid_key(self):
with pytest.raises(ValueError):
PWM.set_duty_cycle("P9_15", 100)
PWM.cleanup()
def test_pwm_duty_cycle_non_setup_key(self):
with pytest.raises(RuntimeError):
PWM.set_duty_cycle("PWM0", 100)
PWM.cleanup()