Datasheet

Hardware Libraries and Drivers
 2010 Microchip Technology Inc. DS41401B-page 25
5.7.2 LCD Function Interface
5.7.2.1 lcd_init
This function configures the LCD peripheral for this board and this glass. Type B
waveforms are used to allow the LCD peripheral to be used for the real-time clock
function. The Timer1 oscillator is configured as the LCD clock source.
FIGURE 5-7:
5.7.2.2 lcd_display_digits
This function accepts a BCD_TYPE variable and maps each digit to the correct
segments. Mapping the segments is done in two stages. First, the digit is converted to
the correct 7-segment mapping. Then, the 7-segment mapping is converted to the
actual glass segments with a long series of “if-else” statements. This function will need
extensive work in the “if-else” statements for applications driving different glass.
FIGURE 5-8:
5.7.2.3 lcd_display_on / lcd_display_off
These two functions simply turn the LCD peripheral off. The Timer1 oscillator is left
running. One use for these functions is to implement display blinking.
FIGURE 5-9:
System_initialize()
{
lcd_init();
}
void display_int(int t)
{
BCD_TYPE bcd;
bcd.digit0 = t %10;
t /= 10;
bcd.digit1 = t % 10;
t /= 10;
bcd.digit2 = t % 10;
t /= 10;
bcd.digit3 = t%10;
lcd_display_digits(bcd);
}
void update_blinking()
{
if(time(0) % 2) // if an odd number of seconds
{
lcd_display_on();
}
else
{
lcd_display_off();
}
}