pin performance



  • hi,

    i have tested pin read performance
    and it is like this:
    read 1000 times pin value:
    20558
    21

    this is my test file

    from machine import Pin
    import time
    dht_pin=Pin('P9', mode=Pin.OPEN_DRAIN, pull=None)
    am = time.ticks_ms()
    au = time.ticks_us() #comment this line if you have not enabled this in firmware
    for i in range(1001):
    	dht_pin()
    print(time.ticks_us()-au) #comment this line if you have not enabled this in firmware
    print(time.ticks_ms()-am)
    

    and i see that i can read one pin value in 21 us
    but specification for e.g. dht11/22 is like this:

    Bit '0' : ~54uS Low and ~24uS High
    Bit '1' : ~54uS Low and ~70uS High
    

    i see that i can miss high value because its duration is 24us
    how can we improve pin read time?

    for test i enabled in firmware time_us()
    but previously tested this without any change



  • I see some possibilities in speed up things by batch read
    I will try to write some code and back with results


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