Dear all,

I have just successfully completed the text input scheme on LCD. Made a video of it (sorry for the bad quality though):
http://www.youtube.com/watch?v=Ba967CND7-U

The text written on the LCD is "multi-tap is 2 cool!!!"
I even implemented a static cursor inside timeout period & blinking otherwise.
And yes the final code is zipping through main() doing other stuff as well while inputting this :-)

I kept a global multitap_timeout initially as 0, and decremented by the 50ms timer interrupt when >0, whenever 1 sec delay is required set it to 20 & wait for it being 0:

/*--------------------------------------------
    This occurs every 50ms
---------------------------------------------*/
void timer_1_interr(void) interrupt 3
{
    static unsigned char data multiplier = 0;
    TR1 = 0;
    TF1 = 0;
    if(++multiplier == 20)
    {    multiplier = 0;
        soft_RTC_ticks++; 
    }
    TH1 = SOFT_RTC_TH1_RELAOD;    //relaod timer 1
    TL1 = SOFT_RTC_TL1_RELAOD;

    TR1 = 1;
    
    if(multitap_timeout)    //dec if not already 0
    multitap_timeout--;            
}

 

Note that I have put it after TR1=1; so the software RTC accuracy wont be affected since it wont ever take >50ms to execute the 2 line code after TR1=1; (in this case). Correct me if this has some downfall. I just now have to save the final alphanumeric string to RAM which should be easy.

Thanks and cheers to everyone who have given their precious time. I feel obliged.

-Regards,
Munish