How to communicate with UART 1 ( WP8548 ) - Mangoh Red

#1

Hi everybody,

I’m trying to use uart 1 about mangoh red. I have connected a FTDI serial cable to IOT boad expansion.
The pin are: 12 && 13

I want use this uart on Linux application. For try the communication I tried to use it like a console.
So I have use “uartMode set 1 console” .

When I reboot my system, I can see system logs. But I can’t interact with them.
I start microcom “microcom /dev/ttyHSL0 -s 115200”.
I can write from mangoh to PC but I receive nothing from PC to mangoh.

Maybe someone have already take this problem ?
I would be grateful if someone have a program example or a tutorial.

Best regards,

#2

The UART on the IoT connector is 1.8V. What FTDI cable are you using?
If the high threshold for the FTDI cable is below 1.8V, you can get away with a voltage divider on the TX.

I do this to communicate with a 3V device and a voltage divider with 2 10k resistors and everything works well, but if you can get the uart working on the RPi header that will be the easiest for you.

I had some serious issues with the uart on the RPi header, if you want to know what that looks like you can view my post history.

#3

FTDI have 1.8V cables available:

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