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How to perform OLED Line clear in Stellaris LM4F232H5QD !!!

nethra patil
Intellectual 560 points

Hello Friends

I have written a string in OLED at (2,5) coordinates using SSI, now I need to rewrite another string in the same coordinate. But both strings are overlapping.Can anybody suggest me how to clear a particular line !??? So that i can wait for few seconds after first string write and then clear it, which enables me to write another string.!!! I tried with the GrFlush(&sContext);, but dint worked :( :/

Below is the code chunk i am following....

void main(void)

{

//Oled initialization code

Display();

}

void Display(void)
{

GrContextInit(&sContext, &g_sCFAL96x64x16);
GrContextForegroundSet(&sContext, ClrWhite);
GrContextFontSet(&sContext, g_pFontCm12);

GrStringDraw(&sContext, "Hello", -1,2,25, 0);

//How to Clear the above string, So that I can display "Stellaris"

GrStringDraw(&sContext, "Stellaris", -1,2,25, 0);


}

 

  • Guru 26105 points

    Hi,

    You must have the follwing sequence:

    GrStringDraw(&sContext, "Hello",  -1, 2, 25, 0);

    // some delay, ~ 100 mS

    GrStringDraw(&sContext, "    ", -1, 2, 25, 0); // four spaces instead Hello

    Generally, you must define the message to be printed outside the function and to have a blank message defined also so to just repeat the command but with the blank message as parameter.

  • in reply to Petrei
    Intellectual 560 points

    Hello Petrei

    I tried with Spaces, but I found both the string and spaces are overlapping instead of just spaces.

    So I thought of clearing the particular line by filling it with black and then rewriting the string in the same location . it is working fine now. but does it impact in any other way???Need your suggestion.

    void ClrScreen()
    {
    sRect.sXMin = 0;
    sRect.sYMin = 60;
    sRect.sXMax = 96;
    sRect.sYMax = 50;
    GrContextForegroundSet(&sContext, ClrBlack);
    GrRectFill(&sContext, &sRect);
    GrFlush(&sContext);
    }

    main()

    {

    GrStringDraw(&sContext, "Hello",  -1, 2,49, 0);

    // delay and screen clear

    SysCtlDelay(SysCtlClockGet());
    ClrScreen();

    GrStringDraw(&sContext, " Stellaris ", -1, 2, 49, 0); /

    }

  • in reply to Petrei
    Intellectual 560 points
    Also y cant we use GrFlush and DpyFlush!!! Is these are only related to OLED buffer flush? OR where we can use these functions, because it dint worked out for me , when i tried for line clearing operation.