mirror of
https://github.com/eddyem/stm32samples.git
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91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
/*
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* This file is part of the 3steppers project.
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* Copyright 2021 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "buttons.h"
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#include "hardware.h"
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typedef struct{
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keyevent event; // current key event
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int16_t counter; // press/release counter
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uint32_t lastTms; // time of last event change
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} keybase;
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static keybase allkeys[BTNSNO] = {0}; // array for buttons' states
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uint32_t lastUnsleep = 0; // last keys activity time
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void process_keys(){
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static uint32_t lastT = 0;
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if(Tms == lastT) return;
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uint16_t d = (uint16_t)(Tms - lastT);
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lastT = Tms;
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for(int i = 0; i < BTNSNO; ++i){
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keybase *k = &allkeys[i];
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keyevent e = k->event;
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if(BTN_state(i)){ // key is in pressed state
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switch(e){
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case EVT_NONE: // just pressed
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case EVT_RELEASE:
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if((k->counter += d) > PRESSTHRESHOLD){
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k->event = EVT_PRESS;
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}
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break;
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case EVT_PRESS: // hold
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if((k->counter += d)> HOLDTHRESHOLD){
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k->event = EVT_HOLD;
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}
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break;
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default:
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break;
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}
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}else{ // released
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if(e == EVT_PRESS || e == EVT_HOLD){ // released
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if(k->counter > PRESSTHRESHOLD) k->counter = PRESSTHRESHOLD;
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else if((k->counter -= d) < 0){
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k->event = EVT_RELEASE; // button released
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}
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}
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}
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if(e != k->event){
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k->lastTms = Tms;
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lastUnsleep = Tms;
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}
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}
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}
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/**
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* @brief keystate - curent key state
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* @param k - key number
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* @param T - last event changing time
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* @return key event
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*/
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keyevent keystate(uint8_t k, uint32_t *T){
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if(k >= BTNSNO) return EVT_NONE;
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keyevent evt = allkeys[k].event;
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// change state `release` to `none` after 1st check
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if(evt == EVT_RELEASE) allkeys[k].event = EVT_NONE;
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if(T) *T = allkeys[k].lastTms;
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return evt;
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}
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// getter of keyevent for allkeys[]
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keyevent keyevt(uint8_t k){
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if(k >= BTNSNO) return EVT_NONE;
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return allkeys[k].event;
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}
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