mirror of
https://gitlab.com/zephray/glider.git
synced 2024-11-14 04:57:54 +00:00
126 lines
3.3 KiB
C
126 lines
3.3 KiB
C
//
|
|
// Copyright 2024 Wenting Zhang <zephray@outlook.com>
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
// SOFTWARE.
|
|
//
|
|
#include <stdio.h>
|
|
#include "pico/stdlib.h"
|
|
#include "button.h"
|
|
|
|
#define BTN1 6
|
|
#define BTN2 5
|
|
|
|
#define BTNCNT 2
|
|
|
|
#define SHORT_PRESS_THRESHOLD 20
|
|
#define LONG_PRESS_THRESHOLD 500
|
|
#define RELEASE_THRESHOLD 20
|
|
|
|
void button_init() {
|
|
gpio_init(BTN1);
|
|
gpio_set_dir(BTN1, GPIO_IN);
|
|
gpio_pull_up(BTN1);
|
|
|
|
gpio_init(BTN2);
|
|
gpio_set_dir(BTN2, GPIO_IN);
|
|
gpio_pull_up(BTN2);
|
|
}
|
|
|
|
// Scan a single key, ID is the key number from 0, gpio is pin number
|
|
// Should be called at ~1ms interval
|
|
// Return value:
|
|
// 0 when nothing pressed
|
|
// 1 when short pressed
|
|
// 2 when long pressed
|
|
static uint32_t button_scan_single(int id, int gpio) {
|
|
static int timecntr[BTNCNT] = {0};
|
|
static enum {
|
|
STATE_IDLE,
|
|
STATE_FIRST_PRESSED,
|
|
STATE_HOLDING,
|
|
STATE_RELEASED
|
|
} state[BTNCNT] = {0};
|
|
uint32_t retval = 0;
|
|
|
|
switch (state[id]) {
|
|
case STATE_IDLE:
|
|
if (gpio_get(gpio) == 0) {
|
|
state[id] = STATE_FIRST_PRESSED;
|
|
timecntr[id] = 0;
|
|
}
|
|
break;
|
|
case STATE_FIRST_PRESSED:
|
|
timecntr[id]++;
|
|
if (gpio_get(gpio) == 0) {
|
|
// Still pressing
|
|
if (timecntr[id] >= SHORT_PRESS_THRESHOLD) {
|
|
state[id] = STATE_HOLDING;
|
|
timecntr[id] = 0;
|
|
}
|
|
}
|
|
else {
|
|
// No longer pressed
|
|
state[id] = STATE_IDLE;
|
|
}
|
|
break;
|
|
case STATE_HOLDING:
|
|
timecntr[id]++;
|
|
if (gpio_get(gpio) == 0) {
|
|
// Still holding
|
|
if (timecntr[id] == LONG_PRESS_THRESHOLD) {
|
|
// Exactly when reaching the threshold, return the key press
|
|
// User gets feedback as soon as the threshold is reached
|
|
retval = 2;
|
|
}
|
|
}
|
|
else {
|
|
// No longer holding
|
|
if (timecntr[id] < LONG_PRESS_THRESHOLD) {
|
|
// Is a short press, signal
|
|
retval = 1;
|
|
}
|
|
timecntr[id] = 0;
|
|
state[id] = STATE_RELEASED;
|
|
}
|
|
break;
|
|
case STATE_RELEASED:
|
|
if (gpio_get(gpio) == 0) {
|
|
// Pressed, reset time counter
|
|
timecntr[id] = 0;
|
|
}
|
|
else {
|
|
// Keep counting time
|
|
// Only treat key as released when reaching threshold
|
|
timecntr[id]++;
|
|
if (timecntr[id] >= RELEASE_THRESHOLD) {
|
|
state[id] = STATE_IDLE;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
uint32_t button_scan() {
|
|
uint32_t btn1 = button_scan_single(0, BTN1);
|
|
uint32_t btn2 = button_scan_single(1, BTN2);
|
|
uint32_t retval = (btn1 & 0x3) | ((btn2 & 0x3) << 2);
|
|
return retval;
|
|
}
|