Waveforms SDK trouble reading from SerialPort

[The_YongGrand]

Hello Digilent support,

I'm using the Waveforms 3.21.2 SDK and struggling to get the SerialPort module to at least read the string that is received from another microcontroller board. 

 

This microcontroller board's serial is using the USB CDC and it is a generic Raspberry Pico board. It is connected to the PC like any other serial ports.

 

For example, here's the code:

var com = new SerialPort();

// wait for the com port to be available:

while(!com.open("COM6",115200)) {}

// The microcontroller board sends a string example: Hello World to the PC after the board is detected and printed on the output:

print(com.read());

However it doesn't read anything - not sure if I missed out something there. Also, any more examples of the SerialPort for the SDK, especially reading strings?

[attila]

Hi @The_YongGrand

This is the Script tool and not the SDK.
The serial port communication is relatively slow so some wait is needed, like com.open(),wait(seconds),com.read() or com.read(seconds) or com.canReadLine()...
In Script loops use wait() to be able to stop it correctly, the while(!com... could block the script.
Try the following:

var list = SerialPortList(); // returns: [name 1, description 1, name 2, desc 2, ...]
for(var i = 0; i < list.length; i+=2){
    print(list[i]+" : "+list[i+1])
}
if(list.length){
    print("Sending Hi to "+list[0])
    var com = new SerialPort();
    if(!com.open(list[0], 115200)) throw "COM open failed"
    com.write("hi\n");
    while(wait()){ // while not stopped
        if(com.canReadLine()){
            print(com.readLine());
        }
    }
}