add examples

RTL00_SDKV35a/example_sources/pm_sleep/readme.txt

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+Example Description
+
+This example describes how to use sleep 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, LED is turned on after device initialize.
+User push the button to turn off LED and trigger device enter sleep mode for 10s.
+If user push button before sleep timeout, the system will resume.
+LED is turned on again after system resume without restart PC.
+
+It can be easily measure power consumption in normal mode and sleep mode before/after push the putton.

RTL00_SDKV35a/example_sources/pm_sleep/src/main.c

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+/*
+ *  Routines to access hardware
+ *
+ *  Copyright (c) 2015 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 "sleep_ex_api.h"
+#include "sys_api.h"
+#include "diag.h"
+#include "main.h"
+
+#define GPIO_LED_PIN        PC_5
+#define GPIO_IRQ_PIN        PC_4
+
+int led_ctrl = 0;
+gpio_t gpio_led;
+
+int put_to_sleep = 0;
+
+void gpio_demo_irq_handler (uint32_t id, gpio_irq_event event)
+{
+    gpio_t *gpio_led;
+
+    gpio_led = (gpio_t *)id;
+
+    if (led_ctrl == 1) {
+        led_ctrl = 0;
+        gpio_write(gpio_led, led_ctrl);
+        put_to_sleep = 1;
+    } else {
+        led_ctrl = 1;
+        gpio_write(gpio_led, led_ctrl);
+    }
+}
+
+/**
+  * @brief  Main program.
+  * @param  None
+  * @retval None
+  */
+void main(void)
+{
+    gpio_irq_t gpio_btn;
+    int IsDramOn = 1;
+
+    DBG_INFO_MSG_OFF(_DBG_GPIO_);
+
+    // 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);
+    gpio_irq_enable(&gpio_btn);
+
+    led_ctrl = 1;
+    gpio_write(&gpio_led, led_ctrl);
+    DBG_8195A("Push button to enter sleep\r\n");
+    //system will hang when it tries to suspend SDRAM for 8711AF
+    if ( sys_is_sdram_power_on() == 0 ) {
+        IsDramOn = 0;
+    }
+
+    put_to_sleep = 0;
+    while(1) {
+        if (put_to_sleep) {
+            DBG_8195A("Sleep 8s or push button to resume system...\r\n");
+            sys_log_uart_off();
+            sleep_ex_selective(SLP_GPIO | SLEEP_WAKEUP_BY_STIMER, 8000, 0, IsDramOn); // sleep_ex can't be put in irq handler
+            sys_log_uart_on();
+            DBG_8195A("System resume\r\n");
+
+            put_to_sleep = 0;
+            led_ctrl = 1;
+            gpio_write(&gpio_led, led_ctrl);
+        }
+    }
+}