Hi,
I'm currently trying to create a linux application (kernel 3.14) on the beaglebone to output rs485 data. I have a serial cape that will produce the rs485, but there is a DE pin on the rs485 transceiver chip that i need to be able to set to high. There are a lot of tutorials i've found relating to using echo commands for the gpio in a terminal connected to the beaglebone, unfortunately none of these have worked.
Is there something in the device tree that i need to modify in order to be able to change this gpio (it's pin 23 (gpio1_0) on the P1 connector of the cape (or P8 on the beaglebone))? As far i as i can see it is in the right mux mode. I'm also using UART1 for this process.
I did wonder if it's something to do with using a very recent version of the kernel on an old board...
Any pointers would be great!
Thanks :)
Jenny