int main(void){ unsigned long status;
Switch_Init(); // PA5 is input
status = Switch_Input(); // 0x00 or 0x20
status = Switch_Input(); // 0x00 or 0x20
Board_Init(); // initialize PF0 and PF4 and make them inputs
// make PF3-1 out (PF3-1 built-in LEDs)
GPIO_PORTF_DIR_R |= (RED|BLUE|GREEN);
// disable alt funct on PF3-1
GPIO_PORTF_AFSEL_R &= ~(RED|BLUE|GREEN);
// enable digital I/O on PF3-1
GPIO_PORTF_DEN_R |= (RED|BLUE|GREEN);
// configure PF3-1 as GPIO
GPIO_PORTF_PCTL_R = (GPIO_PORTF_PCTL_R&0xFFFF000F)+0x00000000;
GPIO_PORTF_AMSEL_R = 0; // disable analog functionality on PF
while(1){
status = Board_Input();
switch(status){ // switches are negative logic on PF0 and PF4
case 0x01: LEDS = BLUE; break; // SW1 pressed
case 0x10: LEDS = RED; break; // SW2 pressed
case 0x00: LEDS = GREEN; break; // both switches pressed
case 0x11: LEDS = 0; break; // neither switch pressed
default: LEDS = (RED|GREEN|BLUE);// unexpected return value
}
}
}
//------------Switch_Debounce------------
// wait for the switch to be touched
// Input: none
// Output: none
// debounces switch
void Switch_WaitForTouch(void){
// wait for release
while(Switch_Input()){};
SysTick_Wait(DELAY10MS); // 10ms
// wait for touch
while(Switch_Input()==0){};
SysTick_Wait(800000); // 10ms
}
//------------Switch_Debounce------------
// Read and return the status of the switch
// Input: none
// Output: 0x02 if PB1 is high
// 0x00 if PB1 is low
// debounces switch
uint32_t Switch_Debounce(void){
uint32_t in,old,time;
time = 1000; // 10 ms
old = Switch_Input();
while(time){
SysTick_Wait(DELAY10US); // 10us
in = Switch_Input();
if(in == old){
time--; // same value
}else{
time = 1000; // different
old = in;
}
}
return old;
}
