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Touch: Use calibration matrix.

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This commit is contained in:
Jared Boone 2016-07-27 14:08:02 -07:00
parent e813db16fd
commit 7492d50f0b
2 changed files with 7 additions and 21 deletions
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10
firmware/application/touch.cpp
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@ -111,10 +111,8 @@ void Manager::feed(const Frame& frame) {
// TODO: Add touch pressure hysteresis? // TODO: Add touch pressure hysteresis?
touch_pressure = (metrics.r < r_touch_threshold); touch_pressure = (metrics.r < r_touch_threshold);
if( touch_pressure ) { if( touch_pressure ) {
const float x = width_pixels * (metrics.x - calib_x_low) / calib_x_range; filter_x.feed(metrics.x * 1024);
filter_x.feed(x); filter_y.feed(metrics.y * 1024);
const float y = height_pixels * (calib_y_high - metrics.y) / calib_y_range;
filter_y.feed(y);
} }
} else { } else {
filter_x.reset(); filter_x.reset();
@ -146,4 +144,8 @@ void Manager::feed(const Frame& frame) {
} }
} }
ui::Point Manager::filtered_point() const {
return calibration().translate({ filter_x.value(), filter_y.value() });
}
} /* namespace touch */ } /* namespace touch */

18
firmware/application/touch.hpp
View file

@ -220,21 +220,10 @@ private:
TouchDetected, TouchDetected,
}; };
static constexpr uint32_t width_pixels = 240;
static constexpr uint32_t height_pixels = 320;
static constexpr float r_touch_threshold = 0x1000; static constexpr float r_touch_threshold = 0x1000;
static constexpr size_t touch_count_threshold { 4 }; static constexpr size_t touch_count_threshold { 4 };
static constexpr uint32_t touch_stable_bound { 4 }; static constexpr uint32_t touch_stable_bound { 4 };
static constexpr float calib_x_low = 0.07f;
static constexpr float calib_x_high = 0.94f;
static constexpr float calib_x_range = calib_x_high - calib_x_low;
static constexpr float calib_y_low = 0.04f;
static constexpr float calib_y_high = 0.91f;
static constexpr float calib_y_range = calib_y_high - calib_y_low;
// Ensure filter length is equal or less than touch_count_threshold, // Ensure filter length is equal or less than touch_count_threshold,
// or coordinates from the last touch will be in the initial averages. // or coordinates from the last touch will be in the initial averages.
Filter<touch_count_threshold> filter_x; Filter<touch_count_threshold> filter_x;
@ -249,12 +238,7 @@ private:
&& filter_y.stable(touch_stable_bound); && filter_y.stable(touch_stable_bound);
} }
ui::Point filtered_point() const { ui::Point filtered_point() const;
return {
static_cast<ui::Coord>(filter_x.value()),
static_cast<ui::Coord>(filter_y.value())
};
}
void touch_started() { void touch_started() {
fire_event(ui::TouchEvent::Type::Start); fire_event(ui::TouchEvent::Type::Start);