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/*
* rhmidi
*
* Copyright (C) 2014 Christian Pointner <equinox@helsinki.at>
*
* This file is part of rhmidi.
*
* rhmidi 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
* any later version.
*
* rhmidi 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 rhmidi. If not, see <http://www.gnu.org/licenses/>.
*/
#include <avr/io.h>
#include "analog.h"
#include "eventqueue.h"
#define ANALOG_PIN PINF
#define ANALOG_PORT PORTF
#define ANALOG_DDR DDRF
#include <LUFA/Drivers/Peripheral/ADC.h>
static struct {
uint8_t enabled;
uint8_t last_sent;
} analog_input_state[ANALOG_NUM_INPUTS];
static uint8_t analog_channels[] = { ADC_CHANNEL0, ADC_CHANNEL1, ADC_CHANNEL2, ADC_CHANNEL3,
ADC_CHANNEL4, ADC_CHANNEL5, ADC_CHANNEL6, ADC_CHANNEL7 };
void analog_init(void)
{
ANALOG_DDR = 0x00;
ANALOG_PORT = 0x00;
int i;
for(i = 0; i < ANALOG_NUM_INPUTS; ++i) {
analog_input_state[i].enabled = 0;
analog_input_state[i].last_sent = 0;
}
ADC_Init(ADC_SINGLE_CONVERSION | ADC_PRESCALE_32);
}
static void analog_channel_set_enabled(uint8_t channel, uint8_t enabled)
{
if(enabled) {
ADC_SetupChannel(channel);
analog_input_state[channel].enabled = 1;
} else {
ADC_DisableChannel(channel);
analog_input_state[channel].enabled = 0;
}
}
void analog_enable_channel(uint8_t channel)
{
if(channel < ANALOG_NUM_INPUTS)
analog_channel_set_enabled(channel, 1);
else if(channel == ANALOG_MIDI_NOTE_ALL_INPUTS - ANALOG_MIDI_NOTE_OFFSET) {
int i;
for(i = 0; i < ANALOG_NUM_INPUTS; ++i)
analog_channel_set_enabled(i, 1);
}
}
void analog_disable_channel(uint8_t channel)
{
if(channel < ANALOG_NUM_INPUTS)
analog_channel_set_enabled(channel, 0);
else if(channel == ANALOG_MIDI_NOTE_ALL_INPUTS - ANALOG_MIDI_NOTE_OFFSET) {
int i;
for(i = 0; i < ANALOG_NUM_INPUTS; ++i)
analog_channel_set_enabled(i, 0);
}
}
uint8_t analog_get_value(uint8_t channel)
{
if(channel >= ANALOG_NUM_INPUTS)
return 0;
return analog_input_state[channel].last_sent;
}
void analog_task(void)
{
uint8_t i;
for(i = 0; i < ANALOG_NUM_INPUTS; ++i) {
if(analog_input_state[i].enabled) {
uint8_t tmp = (ADC_GetChannelReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | analog_channels[i])) >> 3;
if(analog_input_state[i].last_sent != tmp) {
analog_input_state[i].last_sent = tmp;
eventqueue_push(ANALOG_MIDI_NOTE_OFFSET + i, 0);
}
}
}
}
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