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Touch code cleanup, stop scanning when no touch.

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No need to change voltages on touch panel when no touch is detected. This should reduce noise a bit.
This commit is contained in:
Jared Boone 2015-09-02 18:48:38 -07:00
parent f1ca3fe5bb
commit 9a3454d695
1 changed files with 29 additions and 24 deletions
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23
firmware/application/irq_controls.cpp
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@ -79,20 +79,26 @@ static touch::Frame touch_frame;
static uint32_t touch_debounce = 0;
static uint32_t touch_debounce_mask = (1U << 1) - 1;
static bool touch_stable = false;
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];
if( current_phase == portapack::IO::TouchPinsConfig::WaitTouch ) {
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_stable = ((touch_debounce & touch_debounce_mask) == touch_debounce_mask);
} else {
if( touch_stable ) {
switch(current_phase) {
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;
@ -108,14 +114,13 @@ static bool touch_update() {
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_stable;
temp_frame.touch = touch_detected;
touch_cycle = touch_detected;
touch_frame = temp_frame;
temp_frame = {};
return true;