DAQmx configure and write each line separately

[568]

Hello,

I need to create a small driver for DIO96 card that turn on or turn off one line every time.

For example:

--------------------------------------------------------------------------------

int USB_DIO96_SetSwitch1(int Port, int Line, int State)
{
TaskHandle   NI_6509_Handle;
unsigned char  Value[2];
char sLines  [100];

    Value[0] = State;
 
        sprintf(sLines,"%s/port%d/Line%d","Dev1",Port,Line);  
 
        DAQmxCreateTask ("",&NI_6509_Handle); 
        DAQmxCreateDOChan (NI_6509_Handle, sLines, "", DAQmx_Val_ChanPerLine);
        DAQmxWriteDigitalLines (NI_6509_Handle, 1, 1, 10.0, DAQmx_Val_GroupByChannel, Value, NULL, NULL);
        DAQmxClearTask (NI_6509_Handle);  
 
 return 1;
}

Every time when i call this function with different port and line, the card reset previous line state.

How can I solve this problem and to support my old projects.

[macncheese]

Hello 568,

What do you have in the sLines variable?

[568]

Hello,

When i call USB_DIO96_SetSwitch1(0, 1, 1) rhe sLine = "Dev1/port0/line1";

I think is not a problem.

The problem is: For example :

First call> USB_DIO96_SetSwitch1(0, 1, 1) - The line 1 in port 0 rise to 5v.

Now I call this function with different parameters  USB_DIO96_SetSwitch1(0, 2, 1) - The line 2 in port 0 rise to 5v and line 1 in port 0 go down to 0.

By the way, If i call (first call > USB_DIO96_SetSwitch1(0, 1, 1)) again, the chenges on  line 1 in port 0 douse not affect to on line 2 in port 0. He still 5v. It's heppend only first time.

I think the right way is to configure all the lines at start and then change the values. In my old application, i can not use this sequence. I must configure each line and set his value only at runtime.

Best Regard

Boris