/*
* Turns on one light and turns off remaing LEDs depending upon counter value
*/
void changestate(int counter)
{
switch(counter)
{
case 0 ://orange on
ledOrangeOn();
ledYellowOff();
ledGreenOff();
ledBlueOff();
break;
case 1 ://yellow on
ledOrangeOff();
ledYellowOn();
ledGreenOff();
ledBlueOff();
break;
case 2 ://green on
ledOrangeOff();
ledYellowOff();
ledGreenOn();
ledBlueOff();
break;
case 3 ://blue on
ledOrangeOff();
ledYellowOff();
ledGreenOff();
ledBlueOn();
break;
default:
break;
}
}
int main(void) {
int number_presses = 0;
/* Initialize all of the LEDs */
ledInitAll();
/* Initialize both of the pushbuttons */
pushbuttonInitAll();
/* initially orange LED should be on and all others should be off */
ledOrangeOn();
while(1) {
if (sw1In()) {
/* avoid contact bounce */
delay(DELAY_LIMIT);
number_presses++;
if (number_presses == 4) {
number_presses = 0;
}
if (number_presses == 0) {
ledOrangeOn();
} else {
ledOrangeOff();
}
if (number_presses == 1) {
ledYellowOn();
} else {
ledYellowOff();
}
if (number_presses == 2) {
ledGreenOn();
} else {
ledGreenOff();
}
if (number_presses == 3) {
ledBlueOn();
} else {
ledBlueOff();
}
/* wait until button released before checking if pushed again */
while(sw1In()) { ; }
}
}
return 0;
}
/*
* Implements write interface.
* Parameters:
* o void *fp - stream to read.
* o char c - Expects 1 to turn on led and 0 to turn off.
* Return : Number of bytes written
*/
int led_write(void *fp,char c)
{
struct led_stream* stream = (struct led_stream*)fp;
int val = c - '0';
if(val)
{
switch(stream->minor)
{
case ORANGE:
ledOrangeOn();
break;
case YELLOW:
ledYellowOn();
break;
case GREEN:
ledGreenOn();
break;
case BLUE:
ledBlueOn();
break;
default:
return 0;
}
}
else
{
switch(stream->minor)
{
case ORANGE:
ledOrangeOff();
break;
case YELLOW:
ledYellowOff();
break;
case GREEN:
ledGreenOff();
break;
case BLUE:
ledBlueOff();
break;
default:
return 0;
}
}
return 1;
}