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sensors.c
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sensors.c
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/*
* This file is part of the LibreRVAC project
*
* Copyright © 2015-2016
* Aleks-Daniel Jakimenko-Aleksejev <alex.jakimenko@gmail.com>
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include "main.h"
#include "multiplexer.h"
#include "settings.h"
#include "charging.h"
#include "leds.h"
// 38kHz PWM to make infrared stuff happy
// 2000 bits per second
// 5 32-bit packets per second
#define CHARGE_ME_SIGNAL 0b111111000110000110000110011000011L
#define CHARGE_ME_BITS 33
// ↑ Yes, that's a 33-bit value! That's what you *have* to send! WTF? Ask Samsung!
// ↓ It is mostly insensetive to changes of these values. Almost any will do.
#define CHARGE_ME_FREQ 5
#define IR_PWM_FREQ 38000 // Commonly used pwm frequency for IR stuff
#define TICKS_PER_BIT ( (IR_PWM_FREQ) * 2 / 2000 )
#define TICKS_PER_PACKET ( (IR_PWM_FREQ) * 2 / (CHARGE_ME_FREQ) ) // including wait
void setup_sensors() {
CloseTimer1();
// TODO is Timer1 clocked from FPB?
OpenTimer1(T1_ON | T1_PS_1_1 | T1_SOURCE_INT, FOSC / FPB_DIV / (IR_PWM_FREQ * 2));
mT1SetIntPriority(3); // should be same as below
mT1SetIntSubPriority(0);
mT1ClearIntFlag();
mT1IntEnable(1);
MULSEL(PIN_IR_SENSOR_FRONT); // TODO
}
void __ISR(_TIMER_1_VECTOR, IPL3SOFT) T1Interrupt(void) {
//static uint_fast8_t current_sensor = 0;
//if (++current_sensor >= 7) // 7 sensors in total
// current_sensor = 0;
// MULSEL(PIN_IC_SENSORS_X, current_sensor); // TODO
if (is_docked()) {
static uint_fast32_t ticks = 0;
static uint_fast32_t current_bit = 0;
current_bit = ticks / TICKS_PER_BIT;
if (current_bit < CHARGE_ME_BITS &&
CHARGE_ME_SIGNAL & (1 << (CHARGE_ME_BITS - current_bit - 1)))
DIGPIN(PIN_IC_SENSORS_X_OUT, ticks % 2 == 0 ? on : off);
else
DIGPIN(PIN_IC_SENSORS_X_OUT, off);
if (++ticks >= TICKS_PER_PACKET)
ticks = 0;
}
leds_tick(); // TODO any better place to call it?
mT1ClearIntFlag();
}