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project/realtek_ameba1_va0_example/example_sources/gpio/readme.txt

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+Example Description
+
+This example describes how to use GPIO read/write by mbed api.
+
+Requirement Components:
+    a LED
+    a push button
+
+Pin name PC_4 and PC_5 map to GPIOC_4 and GPIOC_5:
+ - PC_4 as input with internal pull-high, connect a push button to this pin and ground.
+ - PC_5 as output, connect a LED to this pin and ground.
+
+In this example, the LED is on when the push button is pressed.
+

project/realtek_ameba1_va0_example/example_sources/gpio/src/main.c

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+/*
+ *  Routines to access hardware
+ *
+ *  Copyright (c) 2013 Realtek Semiconductor Corp.
+ *
+ *  This module is a confidential and proprietary property of RealTek and
+ *  possession or use of this module requires written permission of RealTek.
+ */
+
+#include "device.h"
+#include "gpio_api.h"   // mbed
+#include "main.h"
+
+#define GPIO_LED_PIN       PC_5
+#define GPIO_PUSHBT_PIN    PC_4
+
+/**
+  * @brief  Main program.
+  * @param  None
+  * @retval None
+  */
+//int main_app(IN u16 argc, IN u8 *argv[])
+void main(void)
+{
+    gpio_t gpio_led;
+    gpio_t gpio_btn;
+
+    // Init LED control pin
+    gpio_init(&gpio_led, GPIO_LED_PIN);
+    gpio_dir(&gpio_led, PIN_OUTPUT);    // Direction: Output
+    gpio_mode(&gpio_led, PullNone);     // No pull
+
+    // Initial Push Button pin
+    gpio_init(&gpio_btn, GPIO_PUSHBT_PIN);
+    gpio_dir(&gpio_btn, PIN_INPUT);     // Direction: Input
+    gpio_mode(&gpio_btn, PullUp);       // Pull-High
+
+    while(1){
+        if (gpio_read(&gpio_btn)) {
+            // turn off LED
+            gpio_write(&gpio_led, 0);
+        }
+        else {
+            // turn on LED
+            gpio_write(&gpio_led, 1);
+        }
+    }
+}
+