// This ISR will execute whenever Timer1 has a compare match.
// it kicks off the periodic execution of user code and performs I/O
// Min period: 10msec due to X,Y switch time for touchscreen
void __attribute__((interrupt, auto_psv)) _T1Interrupt(void) {
IFS0bits.T1IF = 0; // clear interrupt flag
if(start == 1)
deadline_miss++;
if (select == X_DIM) {
// DONE: read 5 samples from X-dimension and set Xpos as the median
int i = 0;
for (i = 0; i<N; i ++){
xVal[i] = smooth(touch_adc(1), TOUCH_MAX_X, TOUCH_MIN_X,xPrevVal);
// xVal[i] = touch_adc(1);//cap(touch_adc(1), TOUCH_MAX_X, TOUCH_MIN_X);
}
Xpos = median(xVal,N);
xPrevVal = Xpos;
touch_select_dim(Y_DIM);
select = Y_DIM;
}
else {
// DONE: read 5 samples from Y-dimension and set Ypos as the median
int i = 0;
for (i = 0; i<N; i ++){
yVal[i] = smooth(touch_adc(2), TOUCH_MAX_Y, TOUCH_MIN_Y,yPrevVal);
// yVal[i] = touch_adc(2);//cap(touch_adc(2), TOUCH_MAX_Y, TOUCH_MIN_Y);
}
Ypos = median(yVal,N);
yPrevVal = Ypos;
touch_select_dim(X_DIM);
select = X_DIM;
}
start = 1;
}
void main(){
//Init LCD
__C30_UART=1;
lcd_initialize();
lcd_clear();
touch_init();
CLEARBIT(T1CONbits.TON); // Disable Timer
CLEARBIT(T1CONbits.TCS); // Select internal instruction cycle clock
CLEARBIT(T1CONbits.TGATE); // Disable Gated Timer mode
TMR1 = 0x00; // Clear timer register
T1CONbits.TCKPS = 0b10; // Select 1:64 Prescaler
PR1 = 2000; // Load the period value
IPC0bits.T1IP = 0x01; // Set Timer1 Interrupt Priority Level
CLEARBIT(IFS0bits.T1IF); // Clear Timer1 Interrupt Flag
SETBIT(IEC0bits.T1IE); // Enable Timer1 interrupt
while(1) {
int i = 0;
touch_select_dim(0);
lock = 1;
TMR1 = 0x00;
SETBIT(T1CONbits.TON); // Start Timer
while(lock);
for (i = 0; i < 5; i++) {
xs[i] = touch_adc();
}
// read y
touch_select_dim(1);
lock = 1;
TMR1 = 0x00;
SETBIT(T1CONbits.TON); // Start Timer
while(lock);
for (i = 0; i < 5; i++) {
ys[i] = touch_adc();
}
qsort(xs, 5, sizeof(uint16_t), cmpfunc);
qsort(ys, 5, sizeof(uint16_t), cmpfunc);
lcd_locate(0,0);
lcd_printf("x position: ");
lcd_locate(0,0);
lcd_printf("x position: %d", xs[2]);
lcd_locate(0,1);
lcd_printf("y position: ");
lcd_locate(0,1);
lcd_printf("y position: %d", ys[2]);
}
}
