/*==============================================*/
void clear_lcd ()
{
lcd_put_command(LCD_CLR); //-- clear LCD display
lcd_put_command(LCDHOME); //-- cursor go to 0x00
cursor_position = LINE_0_START;
delay_millisec(5);
}
//of initialisation, are still
//in pseudo 8bit data mode
int main() {
initLCD();
initTimerAndInput();
while (1) {
int m = 0;
int s = 0;
int h = 0;
int i;
for (i=0; i<1; i++){
displayTime(m, s, h);
wait_for_user();
}
while (! GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0)){
if (h == 100) {
s++;
h = 0;
delay_millisec(40); // make up for processing delays
}
if (s == 60){
m++;
s=0;
}
h ++;
displayTime(m, s, h);
delay_millisec(7); //resetting display requires 2ms, 8ms delay results in stopwatch
// running slow, 7ms with 40ms delay every second corrects this
}
wait_for_user(); //removes bounce effect
for (i=0; i<1; i++){
displayTime(m, s, h);
wait_for_user();
}
}
}
/*
* FUNCTION : init_lcd()
* PURPOSE : Initializes LCD
* ACCEPTS : None
* RETURNS : None
* NOTES : Initializes LCD
*/
void init_lcd(void) // Init routine as per HD44780 data sheet
{
LCD_RS = COMMAND_RS; // RS = 0
LCD_RW = WRITE_RW; // RW = 0
delay_millisec(16); // Wait more than 15ms
lcd_put_command(0x38); // Initialize for 8 bit , 2 line
delay_millisec(5); // Wait more than 4.1ms
lcd_put_command(0x38);
delay_millisec(1); // Wait more than 0.1ms
lcd_put_command(0x38);
delay_millisec(1); // Wait more than 0.1ms
lcd_put_command(0x0D); // Display On; Cursor Off; Blink on
lcd_put_command(0x01); // Clear the display
delay_millisec(5); // Wait more than 1.64ms
start_busy_chk = TRUE;
}
void wait_for_user()
{
while (! GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0));
while (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0))
{
delay_millisec(2);
}
return;
}
void displayTime(int m, int s, int h){
lcd_command(0x01); // clears display
delay_millisec(2);
lcd_putchar(div(m));
lcd_putchar(mod(m));
lcd_putchar(':');
lcd_putchar(div(s));
lcd_putchar(mod(s));
lcd_putchar(':');
lcd_putchar(div(h));
lcd_putchar(mod(h));
}