Oliver Broad / Mbed 2 deprecated LCD_nonblocking_demo

Demo of LCD modified to use interrupts not delays.

Dependencies:   mbed

Fork of LCD_nonblocking_demo by Oliver Broad

This is an experiment in controlling an LCD from callbacks independently of the main program loop. As it runs from callbacks it is necessary to check if the library is "busy", which is currently indicated by an integer called "busy".

Busy checking should be converted into a method so that the criteria for being "busy" can be changed without changing the API.

As this is rough I have not issued it as a library ... yet.

Also due to my inexperience using the repository manager this is currently listed as a fork of itself. Sorry.

main.cpp

Committer:
oliverb
Date:
2013-11-20
Revision:
3:f18aa98bc9a8
Parent:
2:d87266912897

File content as of revision 3:f18aa98bc9a8:

// Hello World! for the TextLCD
/*
 * Heavily modified LCD "Hello world"
 *
 * LCD Library has been merged into program for convenience of development, and
 * can be de-merged once its looking reliable
 * currently this gives good results with a small LCD and with a LCD emulation VFD
 * but is not reliable with a GU140x32-7806A graphic VFD
 *
 * Note E is set to 1 at end of cycle in an attempt to force a bug as display works fine
 * on first power-up but tends to corrupt after MBED manual reset. I am speculating that
 * something appears on MBED pins that the display "objects" to during a manual reset
 *
 */

#include "LCD_nonblocking.h"
DigitalOut Led1(LED1);
DigitalOut Led2(LED2);
DigitalOut Led3(LED3);
DigitalOut Led4(LED4);


TextLCD lcd(p15, p16, p17, p18, p19, p20, TextLCD::LCD20x4); // rs, e, d4-d7


int main()
{
    while(1) {
        Led1=1;
        lcd.init();
        Led2=1;
        Led1=0;
        while (lcd.busy) {}
        Led3=1;
        Led2=0;
        lcd.printf("Test String that goes over end of line!\n");
        Led4=1;
        Led3=0;
        while (lcd.busy) {}
        Led1=1;
        wait(1);
        // DigitalOut E(p17);
        // E=1; // try to break it
    }
}