I have a Raspberry Pi3 running Ubuntu 16.04. I am logged in via ssh.
I want to connect a hardware device to UART0 at GPIO pins 8 and 10. As best I can figure this should correspond to /dev/ttyAMA0. But I try this shell command and the terminal hangs, the command never returns and even control-C does not work.
echo "testing 123" > /dev/ttyAMA0
It is not a simple permission problem. I'm in the dailout group. Here is what "ls" says
crw-rw---- 1 root dialout 204, 64 Jun 1 16:26 /dev/ttyAMA0
Here is the lines from
dmesg | grep ttyAMA
[ 0.833340] 3f201000.uart: ttyAMA0 at MMIO 0x3f201000 (irq = 87, base_baud = 0) is a PL011 rev2