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helloworld.py
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Tue, Feb 18, 04:15

helloworld.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
import os, sys
# add ../../Sources to the PYTHONPATH
sys.path.append(os.path.join("..", "..", "Sources"))
from yocto_api import *
from yocto_pwmoutput import *
def usage():
scriptname = os.path.basename(sys.argv[0])
print("Usage:")
print(scriptname + " <serial_number> <frequency> <duty_cycle>")
print(scriptname + " <logical_name> <frequency> <duty_cycle>")
print(scriptname + " any <frequency> <duty_cycle> (use any discovered device)")
print(" <frequency>: integer between 1Hz and 1000000Hz")
print(" <duty_cycle>: floating point number between 0.0 and 100.0")
print('Example:')
print(scriptname + ' any 1000 22.5')
sys.exit()
def die(msg):
sys.exit(msg + ' (check USB cable)')
if len(sys.argv) < 4:
usage()
target = sys.argv[1].upper()
frequency = int(sys.argv[2])
duty_cycle = float(sys.argv[3])
# Setup the API to use local USB devices
errmsg = YRefParam()
if YAPI.RegisterHub("usb", errmsg) != YAPI.SUCCESS:
sys.exit("init error" + errmsg.value)
if target == 'ANY':
# retreive any pwmoutput then find its serial #
pwmoutput = YPwmOutput.FirstPwmOutput()
if pwmoutput is None:
die('No module connected')
m = pwmoutput.get_module()
target = m.get_serialNumber()
print('using ' + target)
pwmoutput1 = YPwmOutput.FindPwmOutput(target + '.pwmOutput1')
pwmoutput2 = YPwmOutput.FindPwmOutput(target + '.pwmOutput2')
if not (pwmoutput1.isOnline()):
die('device not connected')
# output 2 : smooth change
pwmoutput2.set_frequency(frequency)
pwmoutput2.set_enabled(YPwmOutput.ENABLED_TRUE)
pwmoutput2.dutyCycleMove(duty_cycle, 3000)
# output 1 : immediate change
pwmoutput1.set_frequency(frequency)
pwmoutput1.set_enabled(YPwmOutput.ENABLED_TRUE)
pwmoutput1.set_dutyCycle(duty_cycle)
YAPI.FreeAPI()

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