Thanks William. I'll try out your instructions on Mon. On Thursday, December 1, 2016 at 10:50:19 PM UTC-7, William Hermans wrote: > > > On Thu, Dec 1, 2016 at 10:39 PM, acheesehead <achee...@gmail.com > <javascript:>> wrote: > >> In all of the examples that I have seen, the P9.x -> GPIO bank.port >> translates to GPIO (bank +1).port between lines in the overlay script. >> > > That's incorrect if I understand what you're trying to say. the P8/P9 > header values for the pins have absolutely no correlation to the kernel pin > values. These values can be gleaned from the schematics. But I typically > use something like the attached file( in pdf format ) that lists all the > important data I need. > > For example P9.22 has a kernel gpio value of gpio0_2. What this means is > that the pin is on gpio bank0 ( bank zero ), and is pin 2 of that gpio > bank. Note, that on the beaglebone there are 4 GPIO banks. gpio0-gpio3. Now > with this in mind. to figure out the sysfs gpio number you would . .. > > gpio_bank * 32 + pin number. So, for the sysfs file entry for the P9.22 > pin. Our pin would be gpio2. But for example, and arguments sake. If this > pin were on gpio_bank 1, then the sysfs entry for this pin would be gpio34. > gpio_bank 1 * 32 + 2. > > Irregardless, I just gave you a step by step, exact steps recipe to > success. That I wrote as I figured it out for the first time myself. >
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