On Thu, Dec 1, 2016 at 10:39 PM, acheesehead <acheeseh...@gmail.com> 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. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORrHK9ANjPM-mzaLK7xhjbKFt5aErTQomyBC1mJ2jBt2rQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
