11-09-2016, 07:52 AM
(11-08-2016, 05:47 PM)pfeerick Wrote:(11-08-2016, 08:00 AM)Artyom Wrote: Thank you for your kind words. But I still need help in this matter. Technically possible to accomplish this task on the current generation of the board? Can anyone suggest? I'm new to the internet of things and programming.
As Marcus said, the pine64 board is not reliable or robust enough on that front at this point in time. It could be as simple as changes needing to be made to the device tree settings, or it could be a issue that we can't work around until the OS has fully loaded. If your goal is reliability, it is probably better to use the serial or I2C bus to talk to another microcontroller like a Arduino or PIC, which does have reliable power-on states.
Marcus: What do you think of external pull downs (say 10K) with a 74HC7014 (hex non-inverting Schmitt-trigger) - do you think that would buffer the output enough? Are there any particular pins that are more random/noisy than others during bootup?
It should at least make sure that the majority (or all, if possible) gpio pins were off (logic zero) immediately after the operating system is loaded. You can certainly make them like raspberri PI.