diff --git a/samples/gui/wasm-runtime-wgl/src/platform/zephyr/XPT2046.c b/samples/gui/wasm-runtime-wgl/src/platform/zephyr/XPT2046.c
index e5c1415e..11d35622 100644
--- a/samples/gui/wasm-runtime-wgl/src/platform/zephyr/XPT2046.c
+++ b/samples/gui/wasm-runtime-wgl/src/platform/zephyr/XPT2046.c
@@ -31,7 +31,9 @@
  *  STATIC PROTOTYPES
  **********************/
 static void xpt2046_corr(int16_t * x, int16_t * y);
+#if 0
 static void xpt2046_avg(int16_t * x, int16_t * y);
+#endif
 
 /**********************
  *  STATIC VARIABLES
@@ -73,7 +75,6 @@ int last_pen_interrupt_time = 0;
 void xpt2046_pen_gpio_callback(struct device *port, struct gpio_callback *cb,
         u32_t pins)
 {
-    int i;
     cnt++;
     if ((k_uptime_get_32() - last_pen_interrupt_time) > 500) {
         k_sem_give(&sem_touch_read);
@@ -86,15 +87,15 @@ void xpt2046_pen_gpio_callback(struct device *port, struct gpio_callback *cb,
 void disable_pen_interrupt()
 {
     int ret = 0;
-    ret = gpio_pin_disable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
+    ret = gpio_disable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
     if (ret != 0) {
-        printf("gpio_pin_configure GPIO_DIR_IN failed\n");
+        printf("gpio_pin_configure GPIO_INPUT failed\n");
     }
 }
 void enable_pen_interrupt()
 {
     int ret = 0;
-    ret = gpio_pin_enable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
+    ret = gpio_enable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
     if (ret != 0) {
         printf("gpio_pin_configure failed\n");
     }
@@ -152,8 +153,8 @@ void xpt2046_init(void)
         return;
     }
     gpio_pin_configure(xpt2046_cs_ctrl.gpio_dev, XPT2046_CS_GPIO_PIN,
-                       GPIO_DIR_OUT);
-    gpio_pin_write(xpt2046_cs_ctrl.gpio_dev, XPT2046_CS_GPIO_PIN, 1);
+                       GPIO_OUTPUT);
+    gpio_pin_set(xpt2046_cs_ctrl.gpio_dev, XPT2046_CS_GPIO_PIN, 1);
     xpt2046_cs_ctrl.gpio_pin = XPT2046_CS_GPIO_PIN;
     xpt2046_cs_ctrl.delay = 0;
     spi_conf_xpt2046.cs = &xpt2046_cs_ctrl;
@@ -169,8 +170,8 @@ void xpt2046_init(void)
     }
     /* Setup GPIO input */
     ret = gpio_pin_configure(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN,
-                             (GPIO_DIR_IN | GPIO_INT | GPIO_INT_EDGE
-                              | GPIO_INT_ACTIVE_LOW | GPIO_INT_DEBOUNCE)
+                             (GPIO_INPUT | GPIO_INT_ENABLE | GPIO_INT_EDGE
+                              | GPIO_INT_LOW_0 | GPIO_INT_DEBOUNCE)
                             );
     if (ret) {
         printk("Error configuring pin %d!\n", XPT2046_PEN_GPIO_PIN);
@@ -183,9 +184,9 @@ void xpt2046_init(void)
     if (ret) {
         printk("gpio_add_callback error\n");
     }
-    ret = gpio_pin_enable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
+    ret = gpio_enable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
     if (ret) {
-        printk("gpio_pin_enable_callback error\n");
+        printk("gpio_enable_callback error\n");
     }
 #endif
 
@@ -209,7 +210,6 @@ bool xpt2046_read(lv_indev_data_t * data)
     static int16_t last_y = 0;
     bool valid = true;
     int s32_ret = 0;
-    uint8_t buf;
 
     int16_t x = 0;
     int16_t y = 0;
@@ -293,6 +293,7 @@ static void xpt2046_corr(int16_t * x, int16_t * y)
 
 }
 
+#if 0
 static void xpt2046_avg(int16_t * x, int16_t * y)
 {
     /*Shift out the oldest data*/
@@ -320,6 +321,7 @@ static void xpt2046_avg(int16_t * x, int16_t * y)
     (*x) = (int32_t) x_sum / avg_last;
     (*y) = (int32_t) y_sum / avg_last;
 }
+#endif
 
 bool touchscreen_read(lv_indev_data_t * data)
 {
diff --git a/samples/gui/wasm-runtime-wgl/src/platform/zephyr/display_ili9340.c b/samples/gui/wasm-runtime-wgl/src/platform/zephyr/display_ili9340.c
index 999b9610..607030c8 100644
--- a/samples/gui/wasm-runtime-wgl/src/platform/zephyr/display_ili9340.c
+++ b/samples/gui/wasm-runtime-wgl/src/platform/zephyr/display_ili9340.c
@@ -18,6 +18,7 @@
 #include <sys/byteorder.h>
 #include <drivers/spi.h>
 #include <string.h>
+#include <stdio.h>
 
 struct ili9340_data {
     struct device *reset_gpio;
@@ -62,29 +63,29 @@ int ili9340_init()
     data->spi_config.cs = NULL;
 #endif
     data->reset_gpio = device_get_binding(
-                        DT_ILITEK_ILI9340_0_RESET_GPIOS_CONTROLLER);
+        DT_ILITEK_ILI9340_0_RESET_GPIOS_CONTROLLER);
     if (data->reset_gpio == NULL) {
         return -EPERM;
     }
 
     gpio_pin_configure(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN,
-                       GPIO_DIR_OUT);
+                       GPIO_OUTPUT);
 
     data->command_data_gpio = device_get_binding(
-                        DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_CONTROLLER);
+                                DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_CONTROLLER);
     if (data->command_data_gpio == NULL) {    
         return -EPERM;
     }
 
     gpio_pin_configure(data->command_data_gpio,
-                        DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_PIN, GPIO_DIR_OUT);
+                       DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_PIN, GPIO_OUTPUT);
 
     LOG_DBG("Resetting display driver\n");
-    gpio_pin_write(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN, 1);
+    gpio_pin_set(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN, 1);
     k_sleep(1);
-    gpio_pin_write(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN, 0);
+    gpio_pin_set(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN, 0);
     k_sleep(1);
-    gpio_pin_write(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN, 1);
+    gpio_pin_set(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN, 1);
     k_sleep(5);
 
     LOG_DBG("Initializing LCD\n");
@@ -228,19 +229,17 @@ static void ili9340_get_capabilities(const struct device *dev,
 void ili9340_transmit(struct ili9340_data *data, u8_t cmd, void *tx_data,
                       size_t tx_len)
 {
-    int i;
-    char * buf1 = tx_data;
     data = (struct ili9340_data *) &ili9340_data1;
     struct spi_buf tx_buf = { .buf = &cmd, .len = 1 };
     struct spi_buf_set tx_bufs = { .buffers = &tx_buf, .count = 1 };
 
-    gpio_pin_write(data->command_data_gpio, DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_PIN,
+    gpio_pin_set(data->command_data_gpio, DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_PIN,
                    ILI9340_CMD_DATA_PIN_COMMAND);
     spi_transceive(data->spi_dev, &data->spi_config, &tx_bufs, NULL);
     if (tx_data != NULL) {
         tx_buf.buf = tx_data;
         tx_buf.len = tx_len;
-        gpio_pin_write(data->command_data_gpio,
+        gpio_pin_set(data->command_data_gpio,
         DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_PIN,
         ILI9340_CMD_DATA_PIN_DATA);
         spi_transceive(data->spi_dev, &data->spi_config, &tx_bufs, NULL);
diff --git a/samples/littlevgl/vgl-wasm-runtime/src/platform/zephyr/XPT2046.c b/samples/littlevgl/vgl-wasm-runtime/src/platform/zephyr/XPT2046.c
index e5c1415e..11d35622 100644
--- a/samples/littlevgl/vgl-wasm-runtime/src/platform/zephyr/XPT2046.c
+++ b/samples/littlevgl/vgl-wasm-runtime/src/platform/zephyr/XPT2046.c
@@ -31,7 +31,9 @@
  *  STATIC PROTOTYPES
  **********************/
 static void xpt2046_corr(int16_t * x, int16_t * y);
+#if 0
 static void xpt2046_avg(int16_t * x, int16_t * y);
+#endif
 
 /**********************
  *  STATIC VARIABLES
@@ -73,7 +75,6 @@ int last_pen_interrupt_time = 0;
 void xpt2046_pen_gpio_callback(struct device *port, struct gpio_callback *cb,
         u32_t pins)
 {
-    int i;
     cnt++;
     if ((k_uptime_get_32() - last_pen_interrupt_time) > 500) {
         k_sem_give(&sem_touch_read);
@@ -86,15 +87,15 @@ void xpt2046_pen_gpio_callback(struct device *port, struct gpio_callback *cb,
 void disable_pen_interrupt()
 {
     int ret = 0;
-    ret = gpio_pin_disable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
+    ret = gpio_disable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
     if (ret != 0) {
-        printf("gpio_pin_configure GPIO_DIR_IN failed\n");
+        printf("gpio_pin_configure GPIO_INPUT failed\n");
     }
 }
 void enable_pen_interrupt()
 {
     int ret = 0;
-    ret = gpio_pin_enable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
+    ret = gpio_enable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
     if (ret != 0) {
         printf("gpio_pin_configure failed\n");
     }
@@ -152,8 +153,8 @@ void xpt2046_init(void)
         return;
     }
     gpio_pin_configure(xpt2046_cs_ctrl.gpio_dev, XPT2046_CS_GPIO_PIN,
-                       GPIO_DIR_OUT);
-    gpio_pin_write(xpt2046_cs_ctrl.gpio_dev, XPT2046_CS_GPIO_PIN, 1);
+                       GPIO_OUTPUT);
+    gpio_pin_set(xpt2046_cs_ctrl.gpio_dev, XPT2046_CS_GPIO_PIN, 1);
     xpt2046_cs_ctrl.gpio_pin = XPT2046_CS_GPIO_PIN;
     xpt2046_cs_ctrl.delay = 0;
     spi_conf_xpt2046.cs = &xpt2046_cs_ctrl;
@@ -169,8 +170,8 @@ void xpt2046_init(void)
     }
     /* Setup GPIO input */
     ret = gpio_pin_configure(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN,
-                             (GPIO_DIR_IN | GPIO_INT | GPIO_INT_EDGE
-                              | GPIO_INT_ACTIVE_LOW | GPIO_INT_DEBOUNCE)
+                             (GPIO_INPUT | GPIO_INT_ENABLE | GPIO_INT_EDGE
+                              | GPIO_INT_LOW_0 | GPIO_INT_DEBOUNCE)
                             );
     if (ret) {
         printk("Error configuring pin %d!\n", XPT2046_PEN_GPIO_PIN);
@@ -183,9 +184,9 @@ void xpt2046_init(void)
     if (ret) {
         printk("gpio_add_callback error\n");
     }
-    ret = gpio_pin_enable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
+    ret = gpio_enable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
     if (ret) {
-        printk("gpio_pin_enable_callback error\n");
+        printk("gpio_enable_callback error\n");
     }
 #endif
 
@@ -209,7 +210,6 @@ bool xpt2046_read(lv_indev_data_t * data)
     static int16_t last_y = 0;
     bool valid = true;
     int s32_ret = 0;
-    uint8_t buf;
 
     int16_t x = 0;
     int16_t y = 0;
@@ -293,6 +293,7 @@ static void xpt2046_corr(int16_t * x, int16_t * y)
 
 }
 
+#if 0
 static void xpt2046_avg(int16_t * x, int16_t * y)
 {
     /*Shift out the oldest data*/
@@ -320,6 +321,7 @@ static void xpt2046_avg(int16_t * x, int16_t * y)
     (*x) = (int32_t) x_sum / avg_last;
     (*y) = (int32_t) y_sum / avg_last;
 }
+#endif
 
 bool touchscreen_read(lv_indev_data_t * data)
 {
diff --git a/samples/littlevgl/vgl-wasm-runtime/src/platform/zephyr/display_ili9340.c b/samples/littlevgl/vgl-wasm-runtime/src/platform/zephyr/display_ili9340.c
index c34c4244..607030c8 100644
--- a/samples/littlevgl/vgl-wasm-runtime/src/platform/zephyr/display_ili9340.c
+++ b/samples/littlevgl/vgl-wasm-runtime/src/platform/zephyr/display_ili9340.c
@@ -18,6 +18,7 @@
 #include <sys/byteorder.h>
 #include <drivers/spi.h>
 #include <string.h>
+#include <stdio.h>
 
 struct ili9340_data {
     struct device *reset_gpio;
@@ -68,7 +69,7 @@ int ili9340_init()
     }
 
     gpio_pin_configure(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN,
-                       GPIO_DIR_OUT);
+                       GPIO_OUTPUT);
 
     data->command_data_gpio = device_get_binding(
                                 DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_CONTROLLER);
@@ -77,14 +78,14 @@ int ili9340_init()
     }
 
     gpio_pin_configure(data->command_data_gpio,
-                       DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_PIN, GPIO_DIR_OUT);
+                       DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_PIN, GPIO_OUTPUT);
 
     LOG_DBG("Resetting display driver\n");
-    gpio_pin_write(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN, 1);
+    gpio_pin_set(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN, 1);
     k_sleep(1);
-    gpio_pin_write(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN, 0);
+    gpio_pin_set(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN, 0);
     k_sleep(1);
-    gpio_pin_write(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN, 1);
+    gpio_pin_set(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN, 1);
     k_sleep(5);
 
     LOG_DBG("Initializing LCD\n");
@@ -228,30 +229,28 @@ static void ili9340_get_capabilities(const struct device *dev,
 void ili9340_transmit(struct ili9340_data *data, u8_t cmd, void *tx_data,
                       size_t tx_len)
 {
-    int i;
-    char * buf1 = tx_data;
     data = (struct ili9340_data *) &ili9340_data1;
     struct spi_buf tx_buf = { .buf = &cmd, .len = 1 };
     struct spi_buf_set tx_bufs = { .buffers = &tx_buf, .count = 1 };
 
-    gpio_pin_write(data->command_data_gpio, DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_PIN,
+    gpio_pin_set(data->command_data_gpio, DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_PIN,
                    ILI9340_CMD_DATA_PIN_COMMAND);
     spi_transceive(data->spi_dev, &data->spi_config, &tx_bufs, NULL);
     if (tx_data != NULL) {
         tx_buf.buf = tx_data;
         tx_buf.len = tx_len;
-        gpio_pin_write(data->command_data_gpio,
+        gpio_pin_set(data->command_data_gpio,
         DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_PIN,
         ILI9340_CMD_DATA_PIN_DATA);
         spi_transceive(data->spi_dev, &data->spi_config, &tx_bufs, NULL);
     }
 }
 
-struct display_driver_api ili9340_api1 ={
+struct display_driver_api ili9340_api1 = {
     .blanking_on = ili9340_display_blanking_on,
     .blanking_off = ili9340_display_blanking_off,
     .write = ili9340_write,
-    .read =  ili9340_read,
+    .read = ili9340_read,
     .get_framebuffer = ili9340_get_framebuffer,
     .set_brightness = ili9340_set_brightness,
     .set_contrast = ili9340_set_contrast,