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kbd.h
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kbd.h
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/**
* stm32tpl -- STM32 C++ Template Peripheral Library
* Visit https://github.com/antongus/stm32tpl for new versions
*
* Copyright (c) 2011-2020 Anton B. Gusev aka AHTOXA
*
* 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.
*
*
* file : kbd.h
* description : Keyboard class template.
*
*/
#ifndef STM32TPL_KBD_H_INCLUDED
#define STM32TPL_KBD_H_INCLUDED
#include <scmRTOS.h>
enum { BUTTON_REPEAT = 0x80 };
template <int buf_size>
class Keyboard
{
private:
// keyboard buffer
OS::channel<char, buf_size> buf;
// keyboard state machine
typedef enum
{
ksIdle,
ksDebounce,
ksPause,
ksRepeat
}KbdState;
static const int KB_DEBOUNCE_TME = 4;
static const int KB_PAUSE_TME = 50;
static const int KB_PAUSE_TME2 = 10;
KbdState state;
uint16_t debounce;
uint16_t old_key;
uint16_t ReadInput();
public:
Keyboard():
state(ksIdle),
debounce(0),
old_key(0)
{}
int Keypressed(void) { return buf.get_count(); }
int GetChar(timeout_t timeout = 0) { char ch; return (buf.pop(ch, timeout)) ? ch : -1; }
void Loop()
{
uint16_t tmp = ReadInput();
switch (state)
{
case ksDebounce:
if (old_key != tmp)
state = ksIdle;
else if (!--debounce)
{
if (buf.get_free_size()) buf.push(tmp);
debounce = KB_PAUSE_TME;
state = ksPause;
}
break;
case ksPause:
if (old_key != tmp)
state = ksIdle;
else if (!--debounce)
{
if (buf.get_free_size()) buf.push(tmp | BUTTON_REPEAT);
debounce = KB_PAUSE_TME2;
state = ksRepeat;
}
break;
case ksRepeat:
if (old_key != tmp)
state = ksIdle;
else if (!--debounce)
{
if (buf.get_free_size()) buf.push(tmp | BUTTON_REPEAT);
debounce = KB_PAUSE_TME2;
}
break;
default:
if (tmp)
{
state = ksDebounce;
debounce = KB_DEBOUNCE_TME;
old_key = tmp;
}
break;
} // switch (state)
}
};
#endif // STM32TPL_KBD_H_INCLUDED