update

USDK/example_sources/gpio_irq/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, push the button to trigger interrupt to turn on/off the LED.

USDK/example_sources/gpio_irq/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 "gpio_irq_api.h"   // mbed
+#include "diag.h"
+#include "main.h"
+
+#define GPIO_LED_PIN        PC_5
+#define GPIO_IRQ_PIN        PC_4
+
+int led_ctrl;
+gpio_t gpio_led;
+
+extern u32 ConfigDebugWarn;
+
+void gpio_demo_irq_handler (uint32_t id, gpio_irq_event event)
+{
+    gpio_t *gpio_led;
+
+    DBG_GPIO_WARN("%s==>\n", __FUNCTION__);
+    gpio_led = (gpio_t *)id;
+
+    led_ctrl = !led_ctrl;
+    gpio_write(gpio_led, led_ctrl);
+}
+
+/**
+  * @brief  Main program.
+  * @param  None
+  * @retval None
+  */
+void main(void)
+{
+    gpio_irq_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 as interrupt source
+    gpio_irq_init(&gpio_btn, GPIO_IRQ_PIN, gpio_demo_irq_handler, (uint32_t)(&gpio_led));
+    gpio_irq_set(&gpio_btn, IRQ_FALL, 1);   // Falling Edge Trigger
+    gpio_irq_enable(&gpio_btn);
+
+    led_ctrl = 1;
+    gpio_write(&gpio_led, led_ctrl);
+
+    while(1);
+}
+