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USDK/example_sources/pm_deepsleep/readme.txt

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+Example Description
+
+This example describes how to use deep 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 deep sleep mode for 10s.
+If user press any key before sleep timeout, the system will resume.
+LED is turned on again after device initialize.
+
+It can be easily measure power consumption in normal mode and deep sleep mode before/after push the putton.
+
+NOTE: You will see device resume immediately at first time.
+It's because the log uart is a wakeup source and it buffered a wakeup event when DAP is used.
+The symptom won't appear if you use power source on R43 and only power on module.

USDK/example_sources/pm_deepsleep/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
+
+// deep sleep can only be waked up by GPIOB_1 and GTimer
+#define GPIO_WAKE_PIN       PB_1
+
+// NOTICE: The pull condition may differnet on your board
+PinName pull_down_list[] = {
+    PA_0, PA_1, PA_2, PA_3, PA_4, PA_5, PA_6, PA_7,
+    PB_0,             PB_3, PB_4, PB_5, PB_6, PB_7,
+    PC_0, PC_1, PC_2, PC_3, PC_4, PC_5, PC_6, PC_7, PC_8, PC_9,
+    PD_0, PD_1, PD_2, PD_3, PD_4, PD_5, PD_6, PD_7, PD_8, PD_9,
+    PE_0, PE_1, PE_2, PE_3, PE_4, PE_5, PE_6, PE_7, PE_8, PE_9, PE_A,
+          PF_1, PF_2, PF_3, PF_4, PF_5
+};
+
+// NOTICE: The pull condition may differnet on your board
+PinName pull_up_list[] = {
+                PB_2,
+    PF_0,
+    PG_0, PG_1, PG_2, PG_3, PG_4, PG_5, PG_6, PG_7,
+    PH_0, PH_1, PH_2, PH_3, PH_4, PH_5, PH_6, PH_7,
+    PI_0, PI_1, PI_2, PI_3, PI_4, PI_5, PI_6, PI_7,
+    PJ_0, PJ_1, PJ_2, PJ_3, PJ_4, PJ_5, PJ_6,
+    PK_0, PK_1, PK_2, PK_3, PK_4, PK_5, PK_6
+};
+
+void gpio_pull_control()
+{
+    int i;
+    gpio_t gpio_obj;
+
+    for (i=0; i < sizeof(pull_down_list) / sizeof(pull_down_list[0]); i++) {
+        gpio_init(&gpio_obj, pull_down_list[i]);
+        gpio_dir(&gpio_obj, PIN_INPUT);
+        gpio_mode(&gpio_obj, PullDown);
+    }
+
+    for (i=0; i < sizeof(pull_up_list) / sizeof(pull_up_list[0]); i++) {
+        gpio_init(&gpio_obj, pull_up_list[i]);
+        gpio_dir(&gpio_obj, PIN_INPUT);
+        gpio_mode(&gpio_obj, PullUp);
+    }
+}
+
+void gpio_demo_irq_handler (uint32_t id, gpio_irq_event event)
+{
+    gpio_t *gpio_led;
+    gpio_led = (gpio_t *)id;
+
+    printf("Enter deep sleep...Wait 10s or give rising edge at PB_1 to wakeup system.\r\n\r\n");
+
+    // turn off led
+    gpio_write(gpio_led, 0);
+
+    // turn off log uart
+    sys_log_uart_off();
+
+    // initialize wakeup pin at PB_1
+    gpio_t gpio_wake;
+    gpio_init(&gpio_wake, GPIO_WAKE_PIN);
+    gpio_dir(&gpio_wake, PIN_INPUT);
+    gpio_mode(&gpio_wake, PullDown);
+
+    // Please note that the pull control is different in different board
+    // This example is a sample code for RTL Ameba Dev Board
+    gpio_pull_control();
+
+    // enter deep sleep
+    deepsleep_ex(DSLEEP_WAKEUP_BY_GPIO | DSLEEP_WAKEUP_BY_TIMER, 10000);
+}
+
+void main(void)
+{
+    gpio_t gpio_led;
+    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 on means system is in run mode
+    gpio_write(&gpio_led, 1);
+    printf("\r\nPush button at PC_4 to enter deep sleep\r\n");
+
+    while(1);
+}