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/*
* Pin change interrupt handling
*
* Copyright (c) 2020 Michael Buesch <m@bues.ch>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "compat.h"
#include "util.h"
#include "pcint.h"
#define NR_PCINT 24u
static struct {
pcint_callback_t cb[NR_PCINT];
} pcint;
#if USE_PCINT
static uint8_t pcint_to_regnr(uint8_t index)
{
if (index <= 7u)
return 0u;
if (8u <= index && index <= 14u)
return 1u;
if (16u <= index && index <= 23u)
return 2u;
return 0u; /* invalid */
}
#endif /* USE_PCINT */
#if USE_PCINT
static uint8_t pcint_to_bitnr(uint8_t index)
{
if (index <= 7u)
return index;
if (8u <= index && index <= 14u)
return (uint8_t)(index - 8u);
if (16u <= index && index <= 23u)
return (uint8_t)(index - 16u);
return 0u; /* invalid */
}
#endif /* USE_PCINT */
#define CASE_PCMSK(_regnr, _index, _set) \
case _regnr: \
if (_set) \
PCMSK##_regnr = (uint8_t)(PCMSK##_regnr | (1u << pcint_to_bitnr(_index))); \
else \
PCMSK##_regnr = (uint8_t)(PCMSK##_regnr & ~(1u << pcint_to_bitnr(_index))); \
break;
static void pcint_reg_msk(uint8_t index, bool set)
{
#if USE_PCINT
switch (pcint_to_regnr(index)) {
default:
CASE_PCMSK(0, index, set);
CASE_PCMSK(1, index, set);
CASE_PCMSK(2, index, set);
}
#endif /* USE_PCINT */
}
#define PCINT_ISR(_regnr) \
ISR(PCINT##_regnr##_vect) \
{ \
uint8_t i; \
for (i = 0u; i < NR_PCINT; i++) { \
if (pcint_to_regnr(i) == _regnr) { \
if (pcint.cb[i]) \
pcint.cb[i](); \
} \
} \
}
#if USE_PCINT
PCINT_ISR(0)
PCINT_ISR(1)
PCINT_ISR(2)
#endif /* USE_PCINT */
#define CASE_CLRIF(_regnr) \
case _regnr: \
PCIFR = (1u << PCIF##_regnr); \
break;
void pcint_clear_irq(uint8_t index)
{
#if USE_PCINT
switch (pcint_to_regnr(index)) {
default:
CASE_CLRIF(0);
CASE_CLRIF(1);
CASE_CLRIF(2);
}
#endif /* USE_PCINT */
}
#define UPDATE_PCICR(_regnr) \
do { \
if (PCMSK##_regnr == 0u) { \
PCICR &= (uint8_t)~(1u << PCIE##_regnr); \
} else { \
if (!(PCICR & (1u << PCIE##_regnr))) { \
PCIFR = (1u << PCIF##_regnr); \
PCICR |= (1u << PCIE##_regnr); \
} \
} \
} while (0)
void pcint_enable(uint8_t index, bool enable)
{
pcint_reg_msk(index, enable);
IF_PCINT(
UPDATE_PCICR(0);
UPDATE_PCICR(1);
UPDATE_PCICR(2);
)
}
void pcint_register_callback(uint8_t index, pcint_callback_t cb)
{
if (USE_PCINT) {
if (index < NR_PCINT)
pcint.cb[index] = cb;
}
}
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