I'm working with a new IoT device based on ARM. It has several hardware serial ports, mapped to /dev/ttymxc0 through /dev/ttymxc6.
I was testing this out here, and the hardware serial ports don't seem to work: It looks like Mango is sending the proper string, and the slave device is responding with the proper data (at least according to my scope grab of the bus). But Mango never gets the response.
I tried every possible setting of flow control and echo, and got the same results. Same setup on the /dev/USBx device (a standard FT232RL cheapo converter) workes just fine.
Any ideas on troubleshooting this one?
There's no fire here; It just means I have multiple USB dongles hanging out of the thing, and I'd rather not have that...