lib: set extension header pins to input on startup (closes #50) (#59)

sdk/lib/lilka/src/lilka.cpp

@@ -8,6 +8,7 @@ namespace lilka {
 void begin() {
     serial_begin();
     multiboot.begin();
+    ext_begin();
     spi_begin();
     buzzer.begin(); // Play notification sound
     audio.begin();

sdk/lib/lilka/src/lilka.h

@@ -15,6 +15,7 @@
 #include "lilka/resources.h"
 #include "lilka/fmath.h"
 #include "lilka/audio.h"
+#include "lilka/ext.h"
 
 namespace lilka {
 /// Ініціалізація Лілки

sdk/lib/lilka/src/lilka/config.h

@@ -99,6 +99,8 @@
 #    define LILKA_P6                     14 // ADC2, CH3
 #    define LILKA_P7                     13 // ADC2, CH2
 #    define LILKA_P8                     12 // ADC2, CH1
+#    define LILKA_EXT_PINS \
+        { LILKA_P3, LILKA_P4, LILKA_P5, LILKA_P6, LILKA_P7, LILKA_P8 }
 
 #else
 #    error "LILKA_VERSION is not defined - did you forget to set board to lilka_v2 in your platformio.ini?"

sdk/lib/lilka/src/lilka/ext.cpp

@@ -0,0 +1,16 @@
+#include <initializer_list>
+#include <Arduino.h>
+
+#include "ext.h"
+#include "config.h"
+
+namespace lilka {
+
+void ext_begin() {
+    // Iterate over the pins, set them as inputs
+    for (int pin : LILKA_EXT_PINS) {
+        pinMode(pin, INPUT);
+    }
+}
+
+} // namespace lilka

sdk/lib/lilka/src/lilka/ext.h

@@ -0,0 +1,7 @@
+#pragma once
+
+namespace lilka {
+
+void ext_begin();
+
+} // namespace lilka