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Add support for EMI noise filter for button state #23925

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merged 5 commits into from
Mar 21, 2022
Merged

Add support for EMI noise filter for button state #23925

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09e4209
Add support for EMI noise filter for button state
Na1w Mar 19, 2022
2799fe1
Inverted logic for touchscreen fallback
Na1w Mar 19, 2022
d0a5d03
extracted hw button logic to actually get it to work with the touchsc…
Na1w Mar 19, 2022
495acc1
use an uint8_t as iterator
Na1w Mar 20, 2022
1985d07
tweaks
thinkyhead Mar 21, 2022
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Add support for EMI noise filter for button state
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@Na1w
Na1w committed Mar 19, 2022
commit 09e420921703b021707d96aa2a4167ef01617b7e
23 changes: 22 additions & 1 deletion Marlin/src/lcd/marlinui.h
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Original file line number Diff line number Diff line change
@@ -680,7 +680,28 @@ class MarlinUI {
#endif

static void update_buttons();
static bool button_pressed() { return BUTTON_CLICK() || TERN(TOUCH_SCREEN, touch_pressed(), false); }

#ifdef HAS_ENCODER_EMI_NOISE_PROBLEM
#ifndef EMI_NOISE_FILTER_SAMPLES
#define EMI_NOISE_FILTER_SAMPLES (10)
#endif
/*
Some printers may have issues with EMI noise especially using a motherboard with 3.3V logic levels
it may cause the logical LOW to float into the undefined region and register as a logical HIGH
causing it to errorenously register as if someone clicked the button and in worst case make the printer
unusable in practice.
*/
static bool button_pressed() {
for(auto sample=0;sample<EMI_NOISE_FILTER_SAMPLES;sample++) {
if(!BUTTON_CLICK()) { return false;}
safe_delay(1);
}
return true || TERN(TOUCH_SCREEN, touch_pressed(), false);
}
#else
static bool button_pressed() { return BUTTON_CLICK() || TERN(TOUCH_SCREEN, touch_pressed(), false); }
#endif

#if EITHER(AUTO_BED_LEVELING_UBL, G26_MESH_VALIDATION)
static void wait_for_release();
#endif