mirror of
https://github.com/eddyem/stm32samples.git
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116 lines
3.8 KiB
C
116 lines
3.8 KiB
C
/*
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* This file is part of the TETRIS 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 <stm32f1.h>
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#include "buttons.h"
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#include "hardware.h"
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extern volatile uint32_t Tms;
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uint32_t lastUnsleep = 0;
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// threshold in ms for press/hold
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#define PRESSTHRESHOLD (9)
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#define HOLDTHRESHOLD (249)
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typedef struct{
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keycode code; // key code
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keyevent event; // current key event
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int16_t counter; // press/release counter
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GPIO_TypeDef *port; // key port
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uint16_t pin; // key pin
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uint8_t changed; // the event have been changed
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} keybase;
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keybase allkeys[KEY_AMOUNT] = {
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[KEY_L] = {.port = JLEFT_port, .pin = JLEFT_pin},
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[KEY_R] = {.port = JRIGHT_port, .pin = JRIGHT_pin},
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[KEY_U] = {.port = JUP_port, .pin = JUP_pin},
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[KEY_D] = {.port = JDOWN_port, .pin = JDOWN_pin},
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[KEY_M] = {.port = JMENU_port, .pin = JMENU_pin},
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[KEY_S] = {.port = JENTER_port, .pin = JENTER_pin}
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};
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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 < KEY_AMOUNT; ++i){
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keybase *k = &allkeys[i];
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keyevent e = k->event;
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if(PRESSED(k->port, k->pin)){ // key is in pressed state
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lastUnsleep = Tms; // update activity time (any 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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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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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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switch(e){
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case EVT_PRESS: // count -> none
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if(k->counter > PRESSTHRESHOLD) k->counter = PRESSTHRESHOLD;
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else if((k->counter -= d) < 0) k->event = EVT_NONE; // button released
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break;
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case EVT_HOLD: // count -> release
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if(k->counter > PRESSTHRESHOLD) k->counter = PRESSTHRESHOLD;
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else if((k->counter -= d) < 0) k->event = EVT_RELEASE; // button released
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break;
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default:
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break;
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}
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}
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if(e != k->event) k->changed = 1;
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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 code
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* @param evt - its event
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* @return 1 if event was changed since last call
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*/
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uint8_t keystate(keycode k, keyevent *evt){
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if(k >= KEY_AMOUNT) return EVT_NONE;
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*evt = allkeys[k].event;
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// change state `release` to `none` after 1st check (or will be `changed` @ release -> none)
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if(*evt == EVT_RELEASE) allkeys[k].event = EVT_NONE;
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uint8_t r = allkeys[k].changed;
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allkeys[k].changed = 0;
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return r;
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}
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keyevent keyevt(keycode k){
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if(k >= KEY_AMOUNT) return EVT_NONE;
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return allkeys[k].event;
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}
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// clear all `changed` states
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void clear_events(){
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for(int i = 0; i < KEY_AMOUNT; ++i)
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allkeys[i].changed = 0;
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}
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