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Debounce.c
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128 lines (116 loc) · 2.22 KB
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/*
* Debounce.c
*
* Bradley University
* ECE 205
* Project 7
*/
#include "Debounce.h"
uint8_t Debounce(void){
//Variable Declaration
uint8_t new_key = false;
uint8_t still_pressed_key = false;
uint8_t released_key = false;
uint8_t temp = KEY_READ;
uint8_t element = 0;
uint8_t key = 0xFF;
uint8_t pinvalue[8];
static uint8_t pinstate[8] = {4,4,4,4,4,4,4,4};
static uint8_t prev_pinvalue[8];
for(uint8_t i = 0; i<8; i++){
switch(i){
case 0:
element = temp & 0x01 ;
break;
case 1:
element = temp & 0x02;
break;
case 2:
element = temp & 0x04;
break;
case 3:
element = temp & 0x08;
break;
case 4:
element = temp & 0x10;
break;
case 5:
element = temp & 0x20;
break;
case 6:
element = temp & 0x40;
break;
case 7:
element = temp & 0x80;
break;
}// end switch
if (element >= 1) {
element = 1;
}
else {
element = 0;
}
pinvalue[i] = element;
element = 0;
}// end for
for(uint8_t i = 0; i<8; i++){
if (pinvalue[i] == 0) {
switch (pinstate[i]) {
case 0:
new_key = true;
break;
case 1:
still_pressed_key = true;
break;
case 4:
new_key = true;
break;
default:
break;
}// end switch
}// end if
else {
if(pinstate[i] == 1){
still_pressed_key = true;
released_key = true;
}// end if
}// end else
}// end for
for(uint8_t i=0; i<8; i++){
if(new_key == true){
if(pinvalue[i] == 0){
for(uint8_t j=0; j<8; j++){
prev_pinvalue[j] = pinvalue[j];
}// end for
pinstate[i] = 1;
}// end if
else {
}// end else
}// end if
if(still_pressed_key == true){
if(pinvalue[i] == 0){
pinstate[i] = 1;
}
else{
if(prev_pinvalue[i] != pinvalue[i]){
pinstate[i] = 2;
released_key = true;
}// end if
}// end else
}// end if
if(released_key == true){
switch(pinstate[i]){
case 2:
key &= ~(1<<i);
pinstate[i] = 4;
break;
default:
key |= (1<<i);
break;
}// end switch
prev_pinvalue[i] = pinvalue[i];
}// end if
}// end for
//key = key ^ 0xFF;
return key;
}// end DeBouncePro