General Discussions

In my nybble, I can write from the Raspberry Pi but cannot read it through serial communication between NyBoard V0_2 and RaspberryPi 3B+.

Serial communication is enabled and console is disabled in the rasbian settings.

After running the python code below, I get nothing when I run ser.readline ().

ser = serial.Serial (

    port = '/dev/ttyAMA0',

    baudrate = 57600,

    parity = serial.PARITY_NONE,

    stopbits = serial.STOPBITS_ONE,

    bytesize = serial.EIGHTBITS,

    timeout = 1

)

However, nybble works normally when I execute the following command.

echo "kbalance"> /dev/ttyAMA0

On the other hand, the following command does not display anything

cat /dev/ttyAMA0

Why can I write to nybble but not read it from my Raspberry Pi? Is it likely a hardware problem?

I used the following tools on my Raspberry Pi and confirmed that GPIO # 14 and # 15 are true.

https://github.com/kgbplus/gpiotest