diff --git a/.travis.yml b/.travis.yml
index 2a46dfc5..3dc25114 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -39,6 +39,9 @@ env:
     - PLATFORMIO_CI_SRC=examples/board_qc
     - PLATFORMIO_CI_SRC=examples/cdc_XR21B1411/XR_terminal
     - PLATFORMIO_CI_SRC=examples/ftdi/USBFTDILoopback
+    - PLATFORMIO_CI_SRC=examples/GPIO/Blink
+    - PLATFORMIO_CI_SRC=examples/GPIO/Blink_LowLevel
+    - PLATFORMIO_CI_SRC=examples/GPIO/Input
     - PLATFORMIO_CI_SRC=examples/HID/le3dp
     - PLATFORMIO_CI_SRC=examples/HID/scale
     - PLATFORMIO_CI_SRC=examples/HID/SRWS1
diff --git a/UHS2_gpio.cpp b/UHS2_gpio.cpp
index 04814f46..3957f15d 100644
--- a/UHS2_gpio.cpp
+++ b/UHS2_gpio.cpp
@@ -38,14 +38,14 @@ UHS2_GPIO::UHS2_GPIO(USB *pUsb) : m_pUsb(pUsb)
 *   @param  val Value to set the pin to (zero value will clear output, non-zero value will assert output)
 */
 void UHS2_GPIO::digitalWrite(uint8_t pin, uint8_t val) {
-    if(pin > 7)
-        return;
-    uint8_t nValue = m_pUsb->gpioRdOutput();
-    uint8_t nMask = 1 << pin;
-    nValue &= (~nMask);
-    if(val)
-        nValue |= (nMask);
-    m_pUsb->gpioWr(nValue);
+        if(pin > 7)
+                return;
+        uint8_t nValue = m_pUsb->gpioRdOutput();
+        uint8_t nMask = 1 << pin;
+        nValue &= (~nMask);
+        if(val)
+                nValue |= (nMask);
+        m_pUsb->gpioWr(nValue);
 }
 
 /** @brief  Read the value from a GPIO input pin
@@ -53,11 +53,11 @@ void UHS2_GPIO::digitalWrite(uint8_t pin, uint8_t val) {
 *   @retval int Value of GPIO input (-1 on fail)
 */
 int UHS2_GPIO::digitalRead(uint8_t pin) {
-    if(pin > 7)
-        return -1;
-    uint8_t nMask = 1 << pin;
-    uint8_t nValue = m_pUsb->gpioRd();
-    return ((nValue & nMask)?1:0);
+        if(pin > 7)
+                return -1;
+        uint8_t nMask = 1 << pin;
+        uint8_t nValue = m_pUsb->gpioRd();
+        return ((nValue & nMask)?1:0);
 }
 
 /** @brief  Read the value from a GPIO output pin
@@ -66,9 +66,9 @@ int UHS2_GPIO::digitalRead(uint8_t pin) {
 *   @note   Value of MAX3421E output register, i.e. what the device has been set to, not the physical value on the pin
 */
 int UHS2_GPIO::digitalReadOutput(uint8_t pin) {
-    if(pin > 7)
-        return -1;
-    uint8_t nMask = 1 << pin;
-    uint8_t nValue = m_pUsb->gpioRdOutput();
-    return ((nValue & nMask)?1:0);
+        if(pin > 7)
+                return -1;
+        uint8_t nMask = 1 << pin;
+        uint8_t nValue = m_pUsb->gpioRdOutput();
+        return ((nValue & nMask)?1:0);
 }
diff --git a/UHS2_gpio.h b/UHS2_gpio.h
index 06f5e587..498b99b8 100644
--- a/UHS2_gpio.h
+++ b/UHS2_gpio.h
@@ -29,16 +29,15 @@ UHS2_GPIO implements "wiring" style GPIO access. Implemented by Brian Walton bri
 
 #include "Usb.h"
 
-class UHS2_GPIO
-{
-    public:
+class UHS2_GPIO {
+public:
         UHS2_GPIO(USB *pUsb);
 
         void digitalWrite(uint8_t pin, uint8_t val);
         int digitalRead(uint8_t pin);
         int digitalReadOutput(uint8_t pin);
 
-    private:
+private:
         USB* m_pUsb;
 };
 
diff --git a/examples/GPIO/Blink/Blink.ino b/examples/GPIO/Blink/Blink.ino
index 1b785fd3..d7bc594a 100644
--- a/examples/GPIO/Blink/Blink.ino
+++ b/examples/GPIO/Blink/Blink.ino
@@ -11,8 +11,8 @@
 
 #define OUTPUT_PIN 0
 
-USB Usb; //Create an UHS2 interface object
-UHS2_GPIO GPIO(&Usb); //Create a GPIO object
+USB Usb; // Create an UHS2 interface object
+UHS2_GPIO GPIO(&Usb); // Create a GPIO object
 
 void setup()
 {
@@ -30,11 +30,11 @@ void setup()
 
 void loop()
 {
-  //Get the current output value, toggle then wait half a second
+  // Get the current output value, toggle then wait half a second
   int nValue = GPIO.digitalReadOutput(OUTPUT_PIN);
-  nValue = (nValue?0:1);
+  nValue = (nValue ? 0 : 1);
   GPIO.digitalWrite(OUTPUT_PIN, nValue);
-  Serial.print(nValue?"+":"."); //Debug to show what the output should be doing
+  Serial.print(nValue ? "+" : "."); // Debug to show what the output should be doing
   delay(500);
 }
 
diff --git a/examples/GPIO/Blink_LowLevel/Blink_LowLevel.ino b/examples/GPIO/Blink_LowLevel/Blink_LowLevel.ino
index ca1dca31..119b4780 100644
--- a/examples/GPIO/Blink_LowLevel/Blink_LowLevel.ino
+++ b/examples/GPIO/Blink_LowLevel/Blink_LowLevel.ino
@@ -28,13 +28,13 @@ void setup()
 
 void loop()
 {
-  //Get the current output value, toggle then wait half a second
+  // Get the current output value, toggle then wait half a second
   uint8_t nGPO = Usb.gpioRdOutput();
-  uint8_t nValue = ((nGPO & 0x01) == 0x01)?0:1;
-  nGPO &= 0xFE; //clear bit 0
+  uint8_t nValue = ((nGPO & 0x01) == 0x01) ? 0 : 1;
+  nGPO &= 0xFE; // Clear bit 0
   nGPO |= nValue;
   Usb.gpioWr(nGPO);
-  Serial.print(nValue?"+":"."); //Debug to show what the output should be doing
+  Serial.print(nValue ? "+" : "."); // Debug to show what the output should be doing
   delay(500);
 }
 
diff --git a/examples/GPIO/Input/Input.ino b/examples/GPIO/Input/Input.ino
index f7dd9c7d..7306df93 100644
--- a/examples/GPIO/Input/Input.ino
+++ b/examples/GPIO/Input/Input.ino
@@ -11,8 +11,8 @@
 #define INPUT_PIN 0
 #define OUTPUT_PIN 0
 
-USB Usb; //Create an UHS2 interface object
-UHS2_GPIO GPIO(&Usb); //Create a GPIO object
+USB Usb; // Create an UHS2 interface object
+UHS2_GPIO GPIO(&Usb); // Create a GPIO object
 
 void setup()
 {
@@ -30,9 +30,9 @@ void setup()
 
 void loop()
 {
-  //Get the value of input, set value of output
+  // Get the value of input, set value of output
   int nValue = GPIO.digitalRead(INPUT_PIN);
-  nValue = (nValue?0:1);
+  nValue = (nValue ? LOW : HIGH);
   GPIO.digitalWrite(OUTPUT_PIN, nValue);
 }