Julia code using SerialPorts doesn't behave like Python code using serial

[s-celles]

Hello,

I'm trying to communicate with a Nextion display from Julia thanks to a USB TTL converter.

The following Julia code:

using SerialPorts

function _end_of_command(ser)
    for i in 0:2
        write(ser, 0xff)
    end
end

function _execute_command(ser, cmd)
    println(cmd)
    write(ser, cmd)
    _end_of_command(ser)
end

function main()
    ser = SerialPort("/dev/ttyUSB0", 9600)
    _execute_command(ser, "page 0")
    sleep(2)
    _execute_command(ser, "page 1")
    sleep(2)
    _execute_command(ser, "t0.txt=\"Hello\"")
    close(ser)
end


main()

seems very close to this Python code:

import time
import serial


def _end_of_command(ser):
    for i in range(3):
        ser.write(chr(255))

def _execute_command(ser, cmd):
    print(cmd)
    ser.write(cmd)
    _end_of_command(ser)

def main():
    ser = serial.Serial("/dev/ttyUSB0", 9600)
    _execute_command(ser, "page 0")
    time.sleep(2)
    _execute_command(ser, "page 1")
    _end_of_command(ser)
    time.sleep(2)
    _execute_command(ser, "t0.txt=\"Hello\"")
    ser.close()


if __name__ == '__main__':
    main()

Although it seems very similar, the Julia code doesn't work (page doesn't change, txt property of text widget t0 doesn't change...) while Python code is doing exactly what it's expected to do.

Any idea what is going wrong?

Is it a problem on my side (ie my Julia code should be fixed) or is it a Julia library problem (ie SerialPorts should be fixed).

I wonder if #21 is not a possible problem.

Kind regards

[s-celles]

With LibSerialPorts.jl from @andrewadare it works fine

using LibSerialPort

function _end_of_command(ser)
    for i in 0:2
        write(ser, 0xff)
    end
end

function _execute_command(ser, cmd)
    println(cmd)
    write(ser, cmd)
    _end_of_command(ser)
end

function main()
    ser = open("/dev/ttyUSB0", 9600)
    _execute_command(ser, "page 0")
    sleep(2)
    _execute_command(ser, "page 1")
    sleep(2)
    _execute_command(ser, "t0.txt=\"Hello\"")
    close(ser)
end

main()

[sjkelly]

@scls19fr should be fixed in 1c9710e

[s-celles]

Thanks @sjkelly