Portenta_H7_M7. Serial2.write() or Serial2.println() never returns. Serial1, Serial3 - Ok. Kind of magic?
I got the same issue. The portenta H7 get stuck with Serial2.print.
It works fine with Serial1 and Serial3.
I use the Portenta breakout board to get access to those serial ports.
Could it be a problem with the breakout board ?
After all. Second serial port on my P7 still not work on write -(
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