JSlider single-pin fix (#420)

* Modifying jslider to fix single-pin assignment issue.

* Fixed variable names

Author: arntsonl

headers/addons/jslider.h

@@ -33,8 +33,6 @@ class JSliderInput : public GPAddon {
     DpadMode dpadState;           // Saved locally for debounce
     DpadMode dDebState;          // Debounce JSlider State
     uint32_t uDebTime;          // Debounce JSlider Time
-    uint8_t pinSliderLS;
-    uint8_t pinSliderRS;
 };
 
 #endif  // _JSlider_H_

src/addons/jslider.cpp

@@ -12,30 +12,31 @@
 
 bool JSliderInput::available() {
     const SliderOptions& options = Storage::getInstance().getAddonOptions().sliderOptions;
-	return ( options.enabled && isValidPin(options.pinLS) && isValidPin(options.pinRS) );
+	return ( options.enabled && (isValidPin(options.pinLS) || isValidPin(options.pinRS)) );
 }
 
 void JSliderInput::setup()
 {
     const SliderOptions& options = Storage::getInstance().getAddonOptions().sliderOptions;
-    pinSliderLS = options.pinLS;
-    pinSliderRS = options.pinRS;
-
-    gpio_init(pinSliderLS);             // Initialize pin
-    gpio_set_dir(pinSliderLS, GPIO_IN); // Set as INPUT
-    gpio_pull_up(pinSliderLS);          // Set as PULLUP
-    gpio_init(pinSliderRS);
-    gpio_set_dir(pinSliderRS, GPIO_IN); // Set as INPUT
-    gpio_pull_up(pinSliderRS);          // Set as PULLUP
+    if ( isValidPin(options.pinLS)) {
+        gpio_init(options.pinLS);             // Initialize pin
+        gpio_set_dir(options.pinLS, GPIO_IN); // Set as INPUT
+        gpio_pull_up(options.pinLS);          // Set as PULLUP    
+    }
+    if ( isValidPin(options.pinRS)) {
+        gpio_init(options.pinRS);
+        gpio_set_dir(options.pinRS, GPIO_IN); // Set as INPUT
+        gpio_pull_up(options.pinRS);          // Set as PULLUP
+    }
 }
 
 DpadMode JSliderInput::read() {
-    if ( pinSliderLS != (uint8_t)-1 && pinSliderRS != (uint8_t)-1) {
-        if ( !gpio_get(pinSliderLS)) {
-            return DPAD_MODE_LEFT_ANALOG;
-        } else if ( !gpio_get(pinSliderRS)) {
-            return DPAD_MODE_RIGHT_ANALOG;
-        }
+    const SliderOptions& options = Storage::getInstance().getAddonOptions().sliderOptions;
+    if ( isValidPin(options.pinLS) && !gpio_get(options.pinLS)) {
+        return DPAD_MODE_LEFT_ANALOG;
+    }
+    if ( isValidPin(options.pinRS) && !gpio_get(options.pinRS)) {
+        return DPAD_MODE_RIGHT_ANALOG;
     }
     return  DPAD_MODE_DIGITAL;
 }