grlcddemo.c

Graphical lcd library, you can port to many mcu.

#include <stdio.h>
#include "GrLCD.h"

String_T str1 = { 1, C50J+FONT16, 0, "Hello World" };   // large chars on pages 1 & 2
String_T str2 = { 4, L33J, 0, "Time" };                 // small chars on page 4
String_T str3 = { 4, R66J, 0, "Temperature" };
String_T str4;
String_T str5 = { 7, ABSJ, 70, "That's all, folks" };   // small chars on page 7 at column 70

String_T *list1[5] = { CLEAR, &str1, &str2, &str3, EOL };   // list of strings to display, in this
                                                        // example the CLEAR code is redundant
                                                        // since the display was just initialized

char buffer[128];

void main(void)
{
    GrLCDInit();                // initialize the display

    GrLCDList(list1);           // show first 3 strings

    str4.page = 5;              // make a dynamic string definition
    str4.cj_code = L33J+FONT16; // large chars, centered @ 1/3
    str4.text = buffer;         // point to text buffer
    sprintf(buffer, "%2.2d:%2.2d:%2.2d", 11, 22, 33);   // build a time string in buffer
    GrLCDText(&str4);           // display the time

    str4.cj_code = R66J+FONT16; // new justify location, page & text pointer remain same
    sprintf(buffer, "%d F", 68);// build a temperature string in buffer
    GrLCDText(&str4);           // display the temperature

    // make a string of text blinking by alternating showing it and erasing it, leaving other text
    // unchanged. Each time the GrLCDText() function is called, the startcol and column vars are
    // left set to the starting and ending columns of the displayed text, allowing a specific
    // area to be erased. To blink more than one string, save the starting and ending points of
    // each one after the calls to GrLCDText().

    for (;;)                    // infinite loop
    {
        invertflg = 0xFF;       // make this text inverted (white on black)
        GrLCDText(&str5);       // show text
        Sleep(500);             // for a while

        GrLCDBlank(str5.page, startcol,         // erase the text just shown,
                    column - startcol,          // the invert flag is cleared
                    str5.cj_code & FONT16);
        Sleep(500);             // wait a while
    }
}