keyboard: fix key to digit

firmware/src/debug.cpp

@@ -114,7 +114,7 @@ void debugHandleInput(Input input) {
     Serial.print(allKeys[input.key]);
 
     auto digit = getPressedDigit(input.key);
-    if (digit != KEY_NONE) {
+    if (digit != -1) {
       Serial.print(", digit: ");
       Serial.print(digit);
     } else {

firmware/src/keyboard.cpp

@@ -21,12 +21,12 @@ row/col 0 1 2 3
 
 const char *allKeys = " 123A456B789C*0#D";
 
-const uint8_t digits[17] =
-  { KEY_NONE,
-    1, 2, 3, KEY_NONE,
-    4, 5, 6, KEY_NONE,
-    7, 8, 9, KEY_NONE,
-    KEY_NONE, 0, KEY_NONE, KEY_NONE};
+const int8_t digits[17] =
+  { -1,
+    1, 2, 3, -1,
+    4, 5, 6, -1,
+    7, 8, 9, -1,
+    -1, 0, -1, -1};
 
 bool setupKeyboard() {
   if (!kbd.begin()) {
@@ -126,7 +126,7 @@ Key getPressedKey() {
   return (rowPressed * 4) + colPressed + 1;
 }
 
-uint8_t getPressedDigit(Key key) {
+int8_t getPressedDigit(Key key) {
   return digits[key];
 }
 

firmware/src/keyboard.h

@@ -29,8 +29,8 @@ bool setupKeyboard();
 Key handleKeyboard();
 
 /**
- * Returns pressed digit or KEY_NONE if the key is not a digit
+ * Returns pressed digit or -1 if the key is not a digit
  */
-uint8_t getPressedDigit(Key key);
+int8_t getPressedDigit(Key key);
 
 Key handleDebugKeyboard(char key);