audio_sim/timerTest.py at master · rcvlr/audio_sim · GitHub

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"""
Impossible to achieve enough accuracy for timers in Windows.
https://stackoverflow.com/questions/7079864/real-time-operating-via-python
"""

import threading
import time
from vcd import VCDWriter

counter = 0
start = 0

def timer1_func(e, vcd, gpio1):
    global counter
    global start

    counter += 1
    if (counter == 20):
        e.set()
    else:
        timer1 = threading.Timer(10e-3, timer1_func, args=(e, vcd, gpio1))
        timer1.start()

        end = time.perf_counter_ns()
        timestamp = end - start
        start = time.perf_counter_ns()
        print ("Timer-1 ", timestamp/1e6)

        print ("Timer-1 ", counter)

        end = time.perf_counter_ns()
        timestamp = end - start
        vcd.change(gpio1, timestamp, 0)
        vcd.change(gpio1, timestamp + 1, 1)
        vcd.change(gpio1, timestamp + 2, 0)

def timer2_func(e, vcd, gpio2):
    global start

    if (e.is_set()):
        return
    else:
        timer2 = threading.Timer(15e-3, timer2_func, args=(e, vcd, gpio2))
        timer2.start()

        print ("Timer-2 ", counter)

        end = time.perf_counter_ns()
        timestamp = end - start
        vcd.change(gpio2, timestamp, 0)
        vcd.change(gpio2, timestamp + 1, 1)
        vcd.change(gpio2, timestamp + 2, 0)


def main():

    global start

    vcdFile = open("out.vcd", "w")
    vcd = VCDWriter(vcdFile, timescale='1 ns')
    gpio1 = vcd.register_var('BLE', 'timer1', 'wire', size=1, ident='!')
    gpio2 = vcd.register_var('BLE', 'timer2', 'wire', size=1, ident='$')
    start = time.perf_counter_ns()

    # event to signal the consumer to stop consuming
    e = threading.Event()

    timer1 = threading.Timer(10e-3, timer1_func, args=(e, vcd, gpio1))
    #timer2 = threading.Timer(15e-3, timer2_func, args=(e, vcd, gpio2))

    timer1.start()
    time.sleep(10e-3)
    #timer2.start()

    # wait until all timers terminate
    e.wait()

    print("Finish")

    vcd.close()
    vcdFile.close()


if __name__ == '__main__':
    main()