I have an iRobot Create 2 and I am connected to it with the 7-pin connector to a desktop machine via USB. Serial communication is working fine under that configuration. I can tell it to restart with ctrl-G and read the messages it sends back. On power up the serial port outputs the following:
bootloader id: 4701 5652 7E52 3FFF
flash version: 10
flash info crc passed: 1
When I plug in the raspberry pi 3 board with a 7-pin connector to the on-board UART, I can communicate with the iRobot without issue. However, the iRobot starts to continuously sound "uh-oh" every few seconds (no other beeps follow) after about 20 or so seconds of powering up the raspberry pi until the robot enters sleep mode. The iRobot serial port outputs the following message to the raspberry pi every time the robot sounds "uh-oh"
4701 5652 7E52 3FFF
ERROR: language set error type 2
Does anyone know what this error means?
My last resort is to scope the serial port from the raspberry pi to check for noise; unfortunately I don't have access to my scope at the moment.