feat(buttons): allow isPressed() to accept 'A', 'B', 'C' as input

Added support for character and string-based input to `isPressed()` in `ModulinoButtons`,
so it now accepts both index (0–2) and letter identifiers (`'A'`, `'B'`, `'C'`) matching
the physical button labeling.

Closes #3

Author: AntonioBerna

.gitignore

@@ -0,0 +1,28 @@
+# Compiled object files
+*.o
+*.a
+*.so
+*.out
+
+# Arduino build folder
+build/
+*.elf
+*.bin
+*.hex
+*.eep
+
+# Arduino CLI and IDE cache
+*.d
+*.dep
+*.map
+*.lst
+
+# MacOS specific
+.DS_Store
+
+# Backup files
+*~
+*.swp
+
+# VS Code (se lo usi)
+.vscode/

src/Modulino.h

@@ -127,6 +127,17 @@ class ModulinoButtons : public Module {
   PinStatus isPressed(int index) {
     return last_status[index] ? HIGH : LOW;
   }
+  PinStatus isPressed(char button) {
+    int index = buttonToIndex(button);
+    if (index < 0) return LOW;
+    return isPressed(index);
+  }
+  PinStatus isPressed(const char *button) {
+    if (button == nullptr || button[0] == '\0' || button[1] != '\0') {
+      return LOW;
+    }
+    return isPressed(button[0]);
+  }
   bool update() {
     uint8_t buf[3];
     auto res = read((uint8_t*)buf, 3);
@@ -154,6 +165,14 @@ class ModulinoButtons : public Module {
   }
 private:
   bool last_status[3];
+  int buttonToIndex(char button) {
+    switch (toupper(button)) {
+      case 'A': return 0;
+      case 'B': return 1;
+      case 'C': return 2;
+      default:  return -1;
+    }
+  }
 protected:
   uint8_t match[1] = { 0x7C };  // same as fw main.c
 };