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)
# 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.")
# Cleanup afterwards
PWM.stop("PWM0")
PWM.cleanup()
OM.unload("PWM0")
GPIO.cleanup()
PrintPwmData()
# UNCOMMENT FOR CRASH
#print("PWM SET FREQUENCY")
#PWM.set_frequency(PWMGPIO, 200)
#PrintPwmData()
# UNCOMMENT FOR CRASH
#print("PWM SET DUTY CYCLE")
#PWM.set_duty_cycle(PWMGPIO, 25)
#PrintPwmData()
# SETUP PWM RECEIVER
#rcvr = PWMReceiver(GPIO, RECEIVERGPIO, COUNT, SLEEPTIME)
#rcvr.start()
#time.sleep(COUNT*SLEEPTIME + 1)
raw_input("PRESS ENTER WHEN DONE")
except:
raise
finally:
# CLEANUP
print("CLEANUP")
PWM.stop(PWMGPIO)
PWM.cleanup()
#OM.unload("PWM0")
#GPIO.cleanup()