目的

为了达到节能状态，采用RTCalarm唤醒睡眠。

1. 开启RTC以及RTC alarm

2. 修改drv_rtc.c中rtc_init,增加连择时钟源，代码如下：

static rt_err_t _rtc_init(void)
{
#ifdef   BSP_RTC_USING_LSE
    Cy_RTC_SelectClockSource(CY_RTC_CLK_SELECT_WCO);
#else
    Cy_RTC_SelectClockSource(CY_RTC_CLK_SELECT_ILO);
#endif
    if (cyhal_rtc_init(&rtc_obj) != RT_EOK)
    {
        LOG_E("rtc init failed.");
        return -RT_ERROR;
    }

    return RT_EOK;

}

3. 增加alarm方面的函数如下：

static struct rt_alarm * p_alarm_hour = RT_NULL;

/* 闹钟的回调函数，多个闹钟，可以有多个回调函数，用于创建闹钟时注册。闹钟时间到了，会执行此函数 */
static void alarm_hour_cb(rt_alarm_t alarm, time_t timestamp)
{
    LOG_D("alarm_hour_cb ok!\\n");
}

static void rtc_alarm_hour_create(void)
{
    static time_t now;
    struct tm *p_tm;
    struct rt_alarm_setup alarm_setup_test;

    if (p_alarm_hour != RT_NULL)
        return;

    now = time(NULL);
    p_tm = localtime(&now);
    alarm_setup_test.flag = RT_ALARM_SECOND;
    alarm_setup_test.wktime.tm_year = p_tm->tm_year;
    alarm_setup_test.wktime.tm_mon = p_tm->tm_mon;
    alarm_setup_test.wktime.tm_mday = p_tm->tm_mday;
    alarm_setup_test.wktime.tm_wday = p_tm->tm_wday;
    alarm_setup_test.wktime.tm_hour = p_tm->tm_hour + 1;
    alarm_setup_test.wktime.tm_min = p_tm->tm_min;
    alarm_setup_test.wktime.tm_sec = p_tm->tm_sec;

    p_alarm_hour = rt_alarm_create(alarm_hour_cb, &alarm_setup_test);
}

static void rtc_alarm_hour_start(void)
{
    if (p_alarm_hour != RT_NULL)
        rt_alarm_start(p_alarm_hour);
}

static void rtc_alarm_hour_stop(void)
{
    if (p_alarm_hour != RT_NULL)
        rt_alarm_stop(p_alarm_hour);
}

static void rtc_alarm_hour_delete(void)
{
    if (p_alarm_hour != RT_NULL)
    {
        if (rt_alarm_delete(p_alarm_hour) == RT_EOK)
            p_alarm_hour = RT_NULL;
    }
}

4. 修改rt_hw_rtc_init函数，增加alarm创建与启动。

static int rt_hw_rtc_init(void)
{
    rt_err_t result = RT_EOK;

    ifx32_rtc_dev.ops = &_rtc_ops;

    if (rt_hw_rtc_register(&ifx32_rtc_dev, "rtc", RT_DEVICE_FLAG_RDWR, RT_NULL) != RT_EOK)
    {
        LOG_E("rtc init failed");
        result = -RT_ERROR;
    }
    else
    {
        LOG_D("rtc init success");
    }
    /* 设置ALARM*/
    rtc_alarm_hour_create();
    rtc_alarm_hour_start();
    return result;
}

5. 修改主函数代码如下：

#include 
#include 

#include "drv_gpio.h"



#define LED_PIN     GET_PIN(0, 0)
#define USE_SECONDS_FOR_ALARM 10
#define LONG_GLITCH_DELAY_MS        100u    /* in ms */
#define RTC_INTERRUPT_PRIORITY      3u

void set_rtc_alarm_date_time(void);
cyhal_rtc_t rtc_obj;

int main(void)
{
    cy_rslt_t result;
    __enable_irq();
    rt_pin_mode(LED_PIN, PIN_MODE_OUTPUT);
    rt_thread_mdelay(500);
    /* Initialize RTC */
    cyhal_rtc_enable_event(&rtc_obj, CYHAL_RTC_ALARM, RTC_INTERRUPT_PRIORITY, true);
    for (;;)
    {
        rt_kprintf("Go to DeepSleep mode\\r\\n");

        /* Set the RTC generate alarm after 10 seconds */
        set_rtc_alarm_date_time();
        cyhal_system_delay_ms(LONG_GLITCH_DELAY_MS);

        /* Go to deep sleep */
        cyhal_syspm_deepsleep();
        rt_kprintf("Wakeup from DeepSleep mode\\r\\n");

    }
}


/*******************************************************************************/
void set_rtc_alarm_date_time(void)
{
    cy_rslt_t result;

    /* Print the RTC alarm time by UART */
    //LOG_D("RTC alarm will be generated after 10 seconds\\r\\n");
    /* Set the RTC alarm for the specified number of seconds in the future by editing the macro(USE_SECONDS_FOR_ALARM) */
    result = cyhal_rtc_set_alarm_by_seconds(&rtc_obj, USE_SECONDS_FOR_ALARM);
    if (result != CY_RSLT_SUCCESS)
    {
        rt_kprintf("RTC alarm err\\r\\n");
    }
}

下载到开发板后，打开串口终端，显示系统进入睡眠，然后在10秒钟后唤醒

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