修复rtc驱动，实现掉电能保存时钟数据(硬件外接电池)

bsp/imxrt/libraries/drivers/drv_rtc.c

@@ -19,6 +19,7 @@
 
 #include "drv_rtc.h"
 #include "fsl_snvs_hp.h"
+#include "fsl_snvs_lp.h"
 #include <sys/time.h>
 
 #if defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL
@@ -29,7 +30,10 @@ static time_t imxrt_hp_get_timestamp(void)
 {
     struct tm tm_new = {0};
     snvs_hp_rtc_datetime_t rtcDate = {0};
+    snvs_lp_srtc_datetime_t srtcDate = {0};
 
+    SNVS_LP_SRTC_GetDatetime(SNVS, &srtcDate);
+    SNVS_HP_RTC_TimeSynchronize(SNVS); 
     SNVS_HP_RTC_GetDatetime(SNVS, &rtcDate);
 
     tm_new.tm_sec  = rtcDate.second;
@@ -46,41 +50,49 @@ static time_t imxrt_hp_get_timestamp(void)
 static int imxrt_hp_set_timestamp(time_t timestamp)
 {
     struct tm now;
-    snvs_hp_rtc_datetime_t rtcDate = {0};
+    snvs_lp_srtc_datetime_t srtcDate = {0};
 
     gmtime_r(&timestamp, &now);
 
-    rtcDate.second = now.tm_sec ;
-    rtcDate.minute = now.tm_min ;
-    rtcDate.hour   = now.tm_hour;
+    srtcDate.second = now.tm_sec;
+    srtcDate.minute = now.tm_min;
+    srtcDate.hour = now.tm_hour;
+
+    srtcDate.day = now.tm_mday;
+    srtcDate.month = now.tm_mon + 1;
+    srtcDate.year = now.tm_year + 1900;
 
-    rtcDate.day    = now.tm_mday;
-    rtcDate.month  = now.tm_mon  + 1;
-    rtcDate.year   = now.tm_year + 1900;
 
-    if (SNVS_HP_RTC_SetDatetime(SNVS, &rtcDate) != kStatus_Success)
+    if (SNVS_LP_SRTC_SetDatetime(SNVS, &srtcDate) != kStatus_Success)
     {
         LOG_E("set rtc date time failed\n");
         return -RT_ERROR;
     }
 
+    SNVS_HP_RTC_TimeSynchronize(SNVS); 
+
     return RT_EOK;
 }
 
 static rt_err_t imxrt_hp_rtc_init(rt_device_t dev)
 {
     snvs_hp_rtc_config_t snvsRtcConfig;
+    snvs_lp_srtc_config_t snvsSrtcConfig;    
 
+    /* Init SNVS_HP */
     SNVS_HP_RTC_GetDefaultConfig(&snvsRtcConfig);
     SNVS_HP_RTC_Init(SNVS, &snvsRtcConfig);
 
+    /* Init SNVS_LP */
+    SNVS_LP_SRTC_GetDefaultConfig(&snvsSrtcConfig);
+    SNVS_LP_SRTC_Init(SNVS, &snvsSrtcConfig);
     return RT_EOK;
 }
 
 static rt_err_t imxrt_hp_rtc_open(rt_device_t dev, rt_uint16_t oflag)
 {
     SNVS_HP_RTC_StartTimer(SNVS);
-
+    SNVS_LP_SRTC_StartTimer(SNVS);
     return RT_EOK;
 }
 
@@ -156,4 +168,58 @@ int rt_hw_rtc_init(void)
 
 INIT_DEVICE_EXPORT(rt_hw_rtc_init);
 
+#include <rtthread.h>
+#include <rtdevice.h>
+
+#define RTC_NAME       "rtc"
+
+static int rtc_sample(int argc, char *argv[])
+{
+    rt_err_t ret = RT_EOK;
+    time_t now;
+    rt_device_t device = RT_NULL;
+
+    /*寻找设备*/
+    device = rt_device_find(RTC_NAME);
+    if (!device)
+    {
+      LOG_E("find %s failed!", RTC_NAME);
+      return RT_ERROR;
+    }
+
+    /*初始化RTC设备*/
+    if(rt_device_open(device, 0) != RT_EOK)
+    {
+      LOG_E("open %s failed!", RTC_NAME);
+      return RT_ERROR;
+    }
+
+    /* 设置日期 */
+    ret = set_date(2018, 12, 3);
+    if (ret != RT_EOK)
+    {
+        rt_kprintf("set RTC date failed\n");
+        return ret;
+    }
+
+    /* 设置时间 */
+    ret = set_time(11, 15, 50);
+    if (ret != RT_EOK)
+    {
+        rt_kprintf("set RTC time failed\n");
+        return ret;
+    }
+
+    /* 延时3秒 */
+    rt_thread_mdelay(3000);
+
+    /* 获取时间 */
+    now = time(RT_NULL);
+    rt_kprintf("%s\n", ctime(&now));
+
+    return ret;
+}
+/* 导出到 msh 命令列表中 */
+MSH_CMD_EXPORT(rtc_sample, rtc sample);
+
 #endif /* BSP_USING_RTC */