create pin object and add underscore methods

Author: ppibburr

mrblib/gpio.rb

@@ -1,5 +1,84 @@
 module ESP32
   module GPIO
     include Constants
+    
+    class << self
+      alias :digital_write :digitalWrite   
+      alias :digital_read  :digitalRead
+      alias :analog_write  :analogWrite   
+      alias :analog_read   :analogRead    
+      alias :pin_mode      :pinMode 
+      alias :hall_read     :hallRead   
+    end  
+  
+    class Pin
+      PIN_MODE = {
+        pullup:   ESP32::GPIO::INPUT_PULLUP,
+        pulldown: ESP32::GPIO::INPUT_PULLDOWN,
+        input:    ESP32::GPIO::INPUT,
+        output:   ESP32::GPIO::OUTPUT,
+        inout:    ESP32::GPIO::INPUT_OUTPUT
+      }
+
+      attr_reader :pin
+      def initialize pin, mode = :input
+        mode = PIN_MODE[mode] unless mode.is_a?(Integer)
+        @pin = pin
+        self.mode= mode
+      end
+  
+      def analog_read
+        GPIO.analog_read pin
+      end
+    
+      def read
+        GPIO.digital_read pin
+      end 
+     
+      def analog_write val
+        GPIO.analog_write pin, val
+      end
+    
+      def write val
+        GPIO.digital_write pin, val
+        val
+      end 
+      
+      def high!
+        write HIGH
+      end
+      
+      def low!
+        write LOW
+      end
+      
+      def off
+        low!
+      end
+      
+      def on
+        high!
+      end
+    
+      def mode= mode
+        GPIO.pin_mode pin, mode
+      end
+    
+      alias :digital_write :write   
+      alias :digital_read  :read
+    
+      def high?
+        read == LOW
+      end
+      
+      def low?
+        read == HIGH
+      end
+    
+      # the following only work if GPIO_MODE_INPUT_OUTPUT ie, Pin.new(io_num, :inout)
+      def toggle
+        write((read==HIGH) ? LOW : HIGH)
+      end
+    end
   end
 end