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/*
* Potentiometer power control
*
* Copyright (c) 2018-2020 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 "debug.h"
#include "potentiometer.h"
#include "main.h"
/* Potentiometer enable pin. */
#if IS_ATMEGAx8
# define POTEN_PORT PORTC
# define POTEN_DDR DDRC
# define POTEN_LO_BIT 4
# define POTEN_HI_BIT 5
#else
# define POTEN_PORT PORTB
# define POTEN_DDR DDRB
# define POTEN_LO_BIT 2
# define POTEN_HI_BIT 3
#endif
/* Enable/disable the power supply to the potentiometer. */
void potentiometer_enable(bool enable)
{
if (USE_DEEP_SLEEP) {
if (enable) {
/* Turn pot power supply on. */
/* HI = driven */
POTEN_PORT |= (1 << POTEN_HI_BIT);
POTEN_DDR |= (1 << POTEN_HI_BIT);
/* LO = driven */
POTEN_PORT &= (uint8_t)~(1 << POTEN_LO_BIT);
POTEN_DDR |= (1 << POTEN_LO_BIT);
} else {
/* Switch pot power supply to high impedance input. */
if (CONF_ADCINVERT) {
/* HI = driven */
POTEN_PORT |= (1 << POTEN_HI_BIT);
POTEN_DDR |= (1 << POTEN_HI_BIT);
/* LO = high impedance */
POTEN_DDR &= (uint8_t)~(1 << POTEN_LO_BIT);
POTEN_PORT &= (uint8_t)~(1 << POTEN_LO_BIT);
} else {
/* LO = driven */
POTEN_PORT &= (uint8_t)~(1 << POTEN_LO_BIT);
POTEN_DDR |= (1 << POTEN_LO_BIT);
/* HI = high impedance */
POTEN_DDR &= (uint8_t)~(1 << POTEN_HI_BIT);
POTEN_PORT &= (uint8_t)~(1 << POTEN_HI_BIT);
}
}
}
}
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