portapack-mayhem/firmware/application/irq_controls.cpp
Jared Boone 9a3454d695 Touch code cleanup, stop scanning when no touch.
No need to change voltages on touch panel when no touch is detected. This should reduce noise a bit.
2015-09-02 18:48:38 -07:00

214 lines
5.8 KiB
C++

/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* 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, 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; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "irq_controls.hpp"
#include "ch.h"
#include "hal.h"
#include "event.hpp"
#include "touch.hpp"
#include "touch_adc.hpp"
#include "encoder.hpp"
#include "debounce.hpp"
#include "utility.hpp"
#include <cstdint>
#include <array>
#include "portapack_io.hpp"
#include "hackrf_hal.hpp"
using namespace hackrf::one;
static std::array<Debounce, 7> switch_debounce;
static Encoder encoder;
static volatile uint32_t encoder_position { 0 };
static volatile uint32_t touch_phase { 0 };
/* TODO: Change how touch scanning works. It produces a decent amount of noise
* when changing potential on the resistive touch pad. Among other things, I
* see blips of noise when sampling the MAX2837 RSSI signal. And when the
* radio is off (RSSI signal is not driven?), the signal floats a LOT when the
* touch panel potentials are changing.
*
* Ideally, scan only for pressure until a touch is detected. Then scan X/Y.
* Noise will only occur when the panel is being touched. Not ideal, but
* an acceptable improvement.
*/
static std::array<portapack::IO::TouchPinsConfig, 11> touch_pins_configs {
/* State machine will pause here until touch is detected. */
portapack::IO::TouchPinsConfig::WaitTouch,
portapack::IO::TouchPinsConfig::SensePressure,
portapack::IO::TouchPinsConfig::SenseX,
portapack::IO::TouchPinsConfig::SenseY,
portapack::IO::TouchPinsConfig::SenseX,
portapack::IO::TouchPinsConfig::SenseY,
portapack::IO::TouchPinsConfig::SensePressure,
portapack::IO::TouchPinsConfig::SenseX,
portapack::IO::TouchPinsConfig::SenseY,
portapack::IO::TouchPinsConfig::SenseX,
portapack::IO::TouchPinsConfig::SenseY,
};
static touch::Frame temp_frame;
static touch::Frame touch_frame;
static uint32_t touch_debounce = 0;
static uint32_t touch_debounce_mask = (1U << 1) - 1;
static bool touch_detected = false;
static bool touch_cycle = false;
static bool touch_update() {
const auto samples = touch::adc::get();
const auto current_phase = touch_pins_configs[touch_phase];
switch(current_phase) {
case portapack::IO::TouchPinsConfig::WaitTouch:
{
/* Debounce touches. */
const bool touch_raw = (samples.yp < touch::touch_threshold) && (samples.yn < touch::touch_threshold);
touch_debounce = (touch_debounce << 1) | (touch_raw ? 1U : 0U);
touch_detected = ((touch_debounce & touch_debounce_mask) == touch_debounce_mask);
if( !touch_detected && !touch_cycle ) {
return false;
}
}
break;
case portapack::IO::TouchPinsConfig::SensePressure:
temp_frame.pressure += samples;
break;
case portapack::IO::TouchPinsConfig::SenseX:
temp_frame.x += samples;
break;
case portapack::IO::TouchPinsConfig::SenseY:
temp_frame.y += samples;
break;
default:
break;
}
touch_phase++;
if( touch_phase >= touch_pins_configs.size() ) {
/* New iteration, calculate values and flag touch event */
touch_phase = 0;
temp_frame.touch = touch_detected;
touch_cycle = touch_detected;
touch_frame = temp_frame;
temp_frame = {};
return true;
} else {
return false;
}
}
static bool switches_update(const uint8_t switches_raw) {
// TODO: Only fire event on press, not release?
bool switch_changed = false;
for(size_t i=0; i<switch_debounce.size(); i++) {
switch_changed |= switch_debounce[i].feed((switches_raw >> i) & 1);
}
return switch_changed;
}
static bool encoder_read() {
const auto delta = encoder.update(
switch_debounce[5].state(),
switch_debounce[6].state()
);
if( delta != 0 ) {
encoder_position += delta;
return true;;
} else {
return false;
}
}
void timer0_callback(GPTDriver* const) {
eventmask_t event_mask = 0;
if( touch_update() ) event_mask |= EVT_MASK_TOUCH;
const auto switches_raw = portapack::io.io_update(touch_pins_configs[touch_phase]);
if( switches_update(switches_raw) ) {
event_mask |= EVT_MASK_SWITCHES;
if( encoder_read() ) event_mask |= EVT_MASK_ENCODER;
}
/* Signal event loop */
if( event_mask ) {
chSysLockFromIsr();
events_flag_isr(event_mask);
chSysUnlockFromIsr();
}
touch::adc::start();
}
/* TODO: Refactor some/all of this to appropriate shared headers? */
static constexpr uint32_t timer0_count_f = 1000000;
static constexpr uint32_t timer0_prescaler_ratio = (base_m0_clk_f / timer0_count_f);
static constexpr uint32_t ui_interrupt_rate = 1000;
static constexpr uint32_t timer0_match_count = timer0_count_f / ui_interrupt_rate;
/* GPT driver refers to configuration structure during runtime, so make sure
* it sticks around.
*/
static GPTConfig timer0_config {
.callback = timer0_callback,
.pr = timer0_prescaler_ratio - 1,
};
void controls_init() {
/* GPT timer 0 is used to scan user interface controls -- touch screen,
* navigation switches.
*/
gptStart(&GPTD1, &timer0_config);
gptStartContinuous(&GPTD1, timer0_match_count);
}
SwitchesState get_switches_state() {
SwitchesState result;
for(size_t i=0; i<result.size(); i++) {
// TODO: Ignore multiple keys at the same time?
result[i] = switch_debounce[i].state();
}
return result;
}
EncoderPosition get_encoder_position() {
return encoder_position;
}
touch::Frame get_touch_frame() {
return touch_frame;
}