add examples

RTL00_SDKV35a/example_sources/gpio_light_weight/readme.txt

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+Example Description
+
+This example describes how to use GPIO read/write in a light weight way.
+
+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.

RTL00_SDKV35a/example_sources/gpio_light_weight/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
+
+/*  You can improve time cost of gpio write by import source code of
+ *  function "gpio_direct_write" based on your needs.
+ *  In this example, enable CACHE_WRITE_ACTION as demonstration.
+ */
+#define CACHE_WRITE_ACTION (0)
+
+#if defined(CACHE_WRITE_ACTION) && (CACHE_WRITE_ACTION == 1)
+const u8 _GPIO_SWPORT_DR_TBL[] = {
+    GPIO_PORTA_DR,
+    GPIO_PORTB_DR,
+    GPIO_PORTC_DR
+};
+#endif
+
+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
+
+#if defined(CACHE_WRITE_ACTION) && (CACHE_WRITE_ACTION == 1)
+    u8 port_num = HAL_GPIO_GET_PORT_BY_NAME(gpio_led.hal_pin.pin_name);;
+    u8 pin_num  = HAL_GPIO_GET_PIN_BY_NAME(gpio_led.hal_pin.pin_name);;
+    u8 dr_tbl   = _GPIO_SWPORT_DR_TBL[port_num];
+    u32 RegValue;
+#endif
+
+    while(1){
+#if defined(CACHE_WRITE_ACTION) && (CACHE_WRITE_ACTION == 1)
+        if (gpio_read(&gpio_btn)) {
+            // turn off LED
+            RegValue =  HAL_READ32(GPIO_REG_BASE, dr_tbl);
+            RegValue &= ~(1 << pin_num);
+            HAL_WRITE32(GPIO_REG_BASE, dr_tbl, RegValue);
+        } else {
+            // turn on LED
+            RegValue =  HAL_READ32(GPIO_REG_BASE, dr_tbl);
+            RegValue |= (1<< pin_num);
+            HAL_WRITE32(GPIO_REG_BASE, dr_tbl, RegValue);
+        }
+#else
+        if (gpio_read(&gpio_btn)) {
+            // turn off LED
+            gpio_direct_write(&gpio_led, 0);
+        } else {
+            // turn on LED
+            gpio_direct_write(&gpio_led, 1);
+        }
+#endif
+    }
+}
+