scripting several protocols in waveforms

[Klars]

I would like to write a javascript for waveforms where I control my Digital discovery from a PC via UART, the controllable functions is to write and read to some I2C slaves

Have tried using the "protocol" tool with the I2C tab and scripting. I write the script in the "sensor" tab, I found that this tab works differently from the "Custom" tab.

I2C stuff work allright but when I try to init the UART I get error "ReferenceError: Can't find variable: Protocol line: nn"

function initUart(){
    //if(!('Protocol' in this)) throw "Please open the Protocol instrument";
    Protocol.Mode.text = "UART"; // make sure UART tab is selected
    Protocol.UART.TX.value = 0; // Set up UART TX pin on Digilent AD2 :: DIO_0 Pin
    Protocol.UART.RX.value = 1; // Set up UART RX pin on Digilent AD2 :: DIO_1 Pin
    Protocol.UART.Bits.value=8; // Sets or gets the UART number of bits.
    Protocol.UART.Parity.text="None" ;// Sets or gets the parity setting: “None”, “Even”, “Odd”, “Mark (High)”, “Space (Low)”.
    Protocol.UART.Rate.value=9600;   // Sets or gets the baud rate setting
    Protocol.config(); // apply configuration changes now
    Protocol.UART.Receiver(); // reset receiver - that is too start receiving data
    if(!FileAppendLine(logfile, "UART init completed")) return "File write failed";
}

Am I trying to do something that is impossible or am I using the waveforms tool wrong?

 

Regards,

Klars

[attila]

Hi @Klars

Use the Script tool, the bottommost instrument, see:

 

 See the followings:

 

The Sensor is for different purpose, see:

[Klars]

thank you for the help, I have progressed and am now able to initialize UART and I2C without errors. I cannot configure the pins correctly though.

Id like to use pins 24 and 25 for I2C, when setting the pins thusly they end up being 15(decimal) when read back.

I cant find any good information on the capabilities of the different ports. Can the High-speed inputs be used as outputs? I tried this but the pins are not outputting data or clock. Or perhaps there are some other way to configure pins for the Digital Discovery ( compared to the analog discovery ).

I am also unclear weather I need to use the I2C reset.

function i2c_initialise()
{
    if(!('Protocol' in this)) throw "Please open the Protocol tool window";
  //************************************************************
    // Script using Protocol I2C.
    // i2C BUS Set up 
    //************************************************************

    var I2C_reset_AD2_DIO_port =  3 ;  // Set to AD2 DIO Port which controls I2C /Reset io line
        Protocol.Mode.text = "I2C"; // make sure SPI tab is selected
        Protocol.I2C.Mode.value = 1;                       //Set the I2C Protocol tool into Master Mode
//      Protocol.I2C.SCL.setValue(24)
        Protocol.I2C.SCL.value = 24;                        //Set the SCL pin to be DIO 0
        Protocol.I2C.SDA.value = 25;                        //Set the SDA pin to be DIO 1
        Protocol.I2C.SCL.Frequency.value = 100000;         //Set the SCL clock frequency to 100 kHz
        
        //  Do not use clock stretching unless your really need it 
        // Protocol.I2C.Clockstretching.value = 1;           //Enable Clock Stretching�..  This line is  not functioning    
        // Protocol.I2C.ClockStretching.enable;                  // This is the replacement lines 
        
        Protocol.I2C.ClockStretching.value = 0;          // Disable I2C clock stretching 

        Protocol.config() // apply configuration changes now
        
        // flip the active low reset line set low then set high 
        
        set_static_io_pin(I2C_reset_AD2_DIO_port,0);
        wait(0.1); // wait 100 milli second before next instruction.
        set_static_io_pin(I2C_reset_AD2_DIO_port,1);
        wait(0.1); // wait 100 milli second before next instruction.

        // ref  https://forum.digilentinc.com/topic/4942-i2c-subaddress-not-working-properly-in-the-script-tool/    
        // Ref  https://forum.digilentinc.com/topic/21906-how-to-measure-scope-and-protocol/
        // ref  https://forum.digilentinc.com/topic/18944-reading-i2c-via-script-displays-wrong-data/
        
     print(" I2C initialised " + "\n\r" );
     print(" I2C SCL connect to DD DIO Port    " + Protocol.I2C.SCL.value + "\n\r" ) ;
     print(" I2C SDA connect to DD DIO Port    " + Protocol.I2C.SDA.value + "\n\r" ) ;
     print(" I2C /RESET port connect to DD DIO Port    "  + I2C_reset_AD2_DIO_port  + "\n\r" ) ;
     if (Protocol.I2C.ClockStretching.value==0) 
        { 
            print(" I2C Clock Stretching functionality disabled" +  "\n\r" ) ; 
        } 
        else 
        {
            print(" I2C Clock Stretching functionality enabled"+  "\n\r" ) ;
        }
     print("\n\r"+" I2C initialisation complete " + "\n\r" ) ;
}

Printed result:

Starting power supply 


 Power supply is UP
 I2C initialised 


 I2C SCL connect to DD DIO Port    15


 I2C SDA connect to DD DIO Port    15

Any tips? is there a link for scripting reference for Digital Discovery somewhere?

Edit:

Found info on DD pins:

"The Digital Discovery has 24 digital inputs (DIN 0-23) and 16 digital I/Os (DIO 24-39)."

So, I *have to* use pins 24 or above. How do I do this via script?

All the best,

Klars

Edited January 18, 2023 by Klars
found more info

[attila]

Hi @Klars

Value 0 (first index) stands for DIO-24, 1 for DIO-25 ...

I suggest what can be done to be done in the UI, such as these DIO mappings, and using Script to automate what needs to be adjusted.

23 hours ago, attila said:

 

[Klars]

Hi @attila,

thank you kindly for your support. I now have a stable serial terminal that allows me to control the I2C bus from putty or similar.

New obstacle: How can I script ( javascript) the restart condition for reading from a slaves subadress? Reading subadresses works nicely in the 'protocol' window but I cannot find any good javascript-info in the examples or forum.

Please advice.

 

Best Regards,

Klars

[attila]

Hi @Klars

Protocol.I2C.Read(address, number of bytes to read, [sub address byte1, byte2...])