Convert library examples

src/buttons.cpp

@@ -0,0 +1,79 @@
+#include <Arduino.h>
+#include <LiquidCrystal.h>
+
+extern "C" {
+    #include "pb_decode.h"
+    #include "pb_encode.h"
+    #include "lcdkeypad.pb.h"
+}
+
+// Select the pins used on the LCD panel
+LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
+
+// Define some values used by the panel and buttons
+int lcd_key     = 0;
+int adc_key_in  = 0;
+#define btnRIGHT  0
+#define btnUP     1
+#define btnDOWN   2
+#define btnLEFT   3
+#define btnSELECT 4
+#define btnNONE   5
+
+// Read the buttons
+int read_LCD_buttons() {
+    // Read the value from the sensor 
+    adc_key_in = analogRead(0);
+
+    // Map buttons (v1.0 hardware)
+    if (adc_key_in > 1000) return btnNONE;
+    if (adc_key_in < 50)   return btnRIGHT;  
+    if (adc_key_in < 195)  return btnUP; 
+    if (adc_key_in < 380)  return btnDOWN; 
+    if (adc_key_in < 555)  return btnLEFT; 
+    if (adc_key_in < 790)  return btnSELECT;   
+
+    return btnNONE;  // when all others fail, return this...
+}
+
+void setup() {
+    lcd.begin(16, 2);
+    lcd.setCursor(0, 0);
+    lcd.print("Push the buttons");
+}
+
+void loop() {
+    // Move cursor to second line "1" and 9 spaces over
+    lcd.setCursor(9, 1);            
+
+    // Display seconds elapsed since power-up
+    lcd.print(millis()/1000);      
+
+    // Move to the start of the second line
+    lcd.setCursor(0, 1);         
+
+    // Read the buttons
+    lcd_key = read_LCD_buttons();
+
+    // Print button status
+    switch (lcd_key) {
+        case btnRIGHT:
+            lcd.print("RIGHT ");
+            break;
+        case btnLEFT:
+            lcd.print("LEFT   ");
+            break;
+        case btnUP:
+            lcd.print("UP    ");
+            break;
+        case btnDOWN:
+            lcd.print("DOWN  ");
+            break;
+        case btnSELECT:
+            lcd.print("SELECT");
+            break;
+        case btnNONE:
+            lcd.print("NONE  ");
+            break;
+    }
+}