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buttons.c
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/*************************************************
* Firmware for SKVA-03 IVM
* Shendrik Andrey
* 2016 (c)
*
*************************************************/
/* ----------------------- Platform includes ----------------------------------*/
#include "avr/io.h""
/* -------------------------- Own includes ------------------------------------*/
#include "buttons.h"
static void (*_ButtonClick_handler[MAX_BUTTONS])(UCHAR,ButtonClick); /* Array of pointers to ButtonClick handlers */
static ButtonInfo _ButtonInfo[MAX_BUTTONS] = {0}; /* Array of button _ButtonInfo */
static UCHAR _ucEnablePolling = FALSE; /* Polling enable flag */
/* Init button pin for input */
void vInit_ButtonIO(uint8_t* ddrport, UCHAR pin)
{
*ddrport&=~(1<<pin);
}
/* Get button pin value */
UCHAR ucGetButton(uint8_t* pinport, UCHAR pin)
{
return ((*pinport)&(1<<pin))>>pin;
}
void vInit_Button(UCHAR number, uint8_t* ddrport, uint8_t* pinport, UCHAR pin, void (*ButtonClick_handler)(UCHAR ,ButtonClick))
{
/* Add handler */
if(number<MAX_BUTTONS)
{
_ButtonClick_handler[number]=ButtonClick_handler;
/* Add button info */
_ButtonInfo[number].pinport=pinport;
_ButtonInfo[number].pin=pin;
/* Init button IO */
vInit_ButtonIO(ddrport,pin);
}
}
void vButtons_EnablePolling()
{
_ucEnablePolling=TRUE;
}
void vButtons_DisablePolling()
{
_ucEnablePolling=FALSE;
}
/* Buttons FSM, it should be run each 20 ms. */
void vButtonsPoll()
{
UCHAR i=0;
UCHAR val=0;
UCHAR click;
/* Run FSM for each button in array */
for(i=0;i<MAX_BUTTONS && _ucEnablePolling ;i++)
{
/* check if no handler available */
if(!_ButtonClick_handler[i]) continue;
click=NO_CLICK;
val=ucGetButton(_ButtonInfo[i].pinport,_ButtonInfo[i].pin);
/* FSM starts here */
/* Pressed and Hold */
if(val==0)
{
_ButtonInfo[i].cnt++;
/* Check if first click */
if(_ButtonInfo[i].previous==NO_CLICK && _ButtonInfo[i].cnt >= CLICK_CYCLES)
{
_ButtonInfo[i].cnt=0;
_ButtonInfo[i].previous=CLICK;
click=CLICK;
}
else
if(_ButtonInfo[i].previous==CLICK && _ButtonInfo[i].cnt >= HOLD_CYCLES)
{
_ButtonInfo[i].cnt=0;
_ButtonInfo[i].previous=HOLD;
click=CLICK;
}
else
if(_ButtonInfo[i].previous==HOLD && _ButtonInfo[i].cnt >= HOLD_CYCLES_NEXT)
{
_ButtonInfo[i].cnt=0;
_ButtonInfo[i].previous=HOLD;
click=CLICK;
}
}
/* Not pressed or Released */
if(val==1)
{
if(_ButtonInfo[i].previous!=NO_CLICK)
{
click=RELEASED;
/* reset to initial state */
_ButtonInfo[i].cnt=0;
_ButtonInfo[i].previous=NO_CLICK;
}
}
/* call ButtonClick handler */
if(click!=NO_CLICK) _ButtonClick_handler[i](i,click);
}
}