Armbianer
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Very strange things. On my board, UART1 has errors at a speed of more than 1200. The higher the speed, the more errors. That is, when the port is opened at a speed of 1200, everything is fine, at 9600 the characters are unreadable, and at 115200 nothing is displayed at all. Here is an example of displaying the sequence 1234567890 5 times at 2000 baud: That is, the problem is not that UART1 TX does not send anything, but that it sends data with errors, and nothing is displayed at a speed of 115200. I have a very slow SD card. Could this be a possible reason for this behavior?
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Hello. For some reason, UART1 does not work for transmission, only for reception. The transmitter pin itself is definitely working, I checked by switching this pin to output mode, and then switching it to a high/low logical level, everything works properly, the level on the Pin changes. How I check the UART itself: I installed picocom, shorted the TX and RX pins, and I’m trying to see what I’m sending. For UART2 this method works as it should, but UART1 only works for reception. I realized this when I opened the TX and RX, and was able to receive incoming data sent through the USB-UART converter.