I know the RAK11720 doesn’t have USB interface, but I thought if I installed it on a RAK19007 that I would be able to use AT commands through serial interface with the RAK11720. Thinking maybe there was a problem on my base board, I switched to a RAK19011 with a RAK19012 installed, and I get same result - serial output shows continuously garbled text / ASCII garbage. I’ve verified 115200 baud rate, com ports, that I have the Wisblock API V2 installed and I do show that the RAK11720 is connected in the Arduino IDE. I just can’t stop the serial output of junk characters. What am I missing? Thank you
Welcome to the forum @Bubblehead
The WisBlock Core module RAK11722 with the RAK11720 has an USB interface and it works on the WisBlock Base Boards.
115200 baud is correct, 8 bits, no parity, 1 stop bit is the other setting required.
RAK11722 is based on RUI3. WisBlock API V2 is not working with the RUI3 devices, it is for RAK4631, RAK11200 and RAK11310.
Are you still using the original firmware that came with the RAK11722 or did you flash any custom firmware on the module?
Try
- different USB cable
- different USB port
- different Serial Terminal App. You can as well use our WisToolBox.
I did all of those things. It seems the board is constantly writing to the serial port, no matter what I try. In the RAK serial port tool, I can’t even input text because it seems the chip is continuously writing. I did notice a couple of Chinese characters at the beginning of the output in the Arduino IDE before the constant stream of junk text.
Can you please explain more about your setup?
How did you connect the RAK11722 on the RAK19007?
If you are using a RAK11720 stamp module, that is not compatible with the RAK19007.
For explanation about WisDuo Stamp Module and WisBlock Core Module:
- WisDuo stamp modules are small modules to be used on a custom PCB.
- WisBlock Core is a PCB with a stamp module on it and a connector for the WisBlock Base Boards, e.g. the RAK19007.
Example image:
You cannot use a WisDuo Stamp Module on a WisBlock Base Board directly.
This is exactly what I have mounted on the RAK19017 base: Ambiq Apollo3 Core Module for LoRaWAN® | RAK11722
Like I mentioned, the most peculiar thing is that is always writing something to the serial output - no matter the serial tool I use (RAK serial port tool, putter, Arduino IDE etc) I can’t type anything into the AT command window because it is continuously writing to the output - albeit garbage ASCII.
The default firmware of the RAK11720 is sending only a few lines of text after startup with 115200 baud, 8N1. Nothing else.
I have no explanation to what you see.
Do you have a DAPLink or JLink adapter to flash the device through the SED interface?