FiPy release 1.20.2.r4 and all currently available earlier releases
Expansion board 3.1, pytrack
SD card speed class U1
An UHS speed class 1 (U1) SD card can be mounted, listed, write and read apparently endlessly until machine.deepsleep() is executed. After this OSError 19 ENODEV is issued. The device has to be unplugged from power source and then the card works again (till next deepsleep).
Error occurs on Expansion board 3.1 very commonly. The error is very common on Pytrack as well, but sometimes it might take longer (several hours / deepsleep cycles) for error to occur.
This error does not appear with U3 cards, however, U1 is well beyond the speed needs for a data logger type device.
It happens on:
An UHS speed class 1 (U1) SD card can be mounted, listed, write and read apparently endlessly until machine.deepsleep() is executed. After this OSError 19 ENODEV is issued. The device has to be unplugged from power source and then the card works again (till next deepsleep).
Error occurs on Expansion board 3.1 very commonly. The error is very common on Pytrack as well, but sometimes it might take longer (several hours / deepsleep cycles) for error to occur.
This error does not appear with U3 cards, however, U1 is well beyond the speed needs for a data logger type device.
Thanks!