搞好环境，现在就开始测试外设了，像之前一样，新建一个工程，在图形配置工具中，配置一下，真的很简单，我的配置如图，增加了一个串口配置，用于打印，
接下来就是写一下代码，这个也比较简单，主函数如下
- int main ( void )
- {
- int old_second=0;
- /* Initialize all modules */
- SYS_Initialize ( NULL );
- struct tm sys_time;
- //15-01-2018 12:00:00 Monday
- sys_time.tm_hour = 23; /* hour [0,23] */
- sys_time.tm_sec = 00; /* seconds [0,61] */
- sys_time.tm_min = 26; /* minutes [0,59] */
- sys_time.tm_mon = 11; /* month of year [0,11] */
- sys_time.tm_year = 2022; /* years since 1900 */
- sys_time.tm_mday = 10; /* day of month [1,31] */
- sys_time.tm_wday = 6; /* day of week [0,6] (Sunday = 0) */
- /* tm_yday - day of year [0,365] */
- /* tm_isdst - daylight savings flag */
- printf("\n\r---------------------------------------------------------");
- printf("\n\r RTC Demo ");
- printf("\n\r---------------------------------------------------------\n\r");
- RTC_RTCCTimeSet(&sys_time);
-
- while ( true )
- {
- RTC_RTCCTimeGet(&sys_time);
- if(old_second!=sys_time.tm_sec)
- {
- printf("System time is: %02d:%02d:%02d\r\n",sys_time.tm_hour, sys_time.tm_min, sys_time.tm_sec);
- old_second=sys_time.tm_sec;
- }
- /* Maintain state machines of all polled MPLAB Harmony modules. */
- SYS_Tasks ( );
- }
- /* Execution should not come here during normal operation */
- return ( EXIT_FAILURE );
- }
- bool RTC_RTCCTimeSet (struct tm * initialTime )
- {
- /*
- * Add 1900 to the tm_year member and the adjust for the RTC reference year
- * Set YEAR(according to Reference Year), MONTH and DAY
- *set Hour Minute and Second
- */
- RTC_REGS->MODE2.RTC_CLOCK = (uint32_t)(((TM_STRUCT_REFERENCE_YEAR + (uint32_t)initialTime->tm_year) - REFERENCE_YEAR) << RTC_MODE2_CLOCK_YEAR_Pos |
- ((ADJUST_MONTH((uint32_t)initialTime->tm_mon)) << RTC_MODE2_CLOCK_MONTH_Pos) |
- ((uint32_t)initialTime->tm_mday << RTC_MODE2_CLOCK_DAY_Pos) |
- ((uint32_t)initialTime->tm_hour << RTC_MODE2_CLOCK_HOUR_Pos) |
- ((uint32_t)initialTime->tm_min << RTC_MODE2_CLOCK_MINUTE_Pos) |
- ((uint32_t)initialTime->tm_sec << RTC_MODE2_CLOCK_SECOND_Pos));
- while((RTC_REGS->MODE2.RTC_SYNCBUSY & RTC_MODE2_SYNCBUSY_CLOCK_Msk) == RTC_MODE2_SYNCBUSY_CLOCK_Msk)
- {
- /* Synchronization after writing value to CLOCK Register */
- }
- return true;
- }
- void RTC_RTCCTimeGet ( struct tm * currentTime )
- {
- uint32_t dataClockCalendar = 0U;
- uint32_t timeMask = 0U;
- while((RTC_REGS->MODE2.RTC_SYNCBUSY & RTC_MODE2_SYNCBUSY_CLOCKSYNC_Msk) == RTC_MODE2_SYNCBUSY_CLOCKSYNC_Msk)
- {
- /* Synchronization before reading value from CLOCK Register */
- }
- dataClockCalendar = RTC_REGS->MODE2.RTC_CLOCK;
- timeMask = (dataClockCalendar & RTC_MODE2_CLOCK_HOUR_Msk) >> RTC_MODE2_CLOCK_HOUR_Pos;
- currentTime->tm_hour = (int)timeMask;
- timeMask = (dataClockCalendar & RTC_MODE2_CLOCK_MINUTE_Msk) >> RTC_MODE2_CLOCK_MINUTE_Pos;
- currentTime->tm_min = (int)timeMask;
- timeMask = (dataClockCalendar & RTC_MODE2_CLOCK_SECOND_Msk) >> RTC_MODE2_CLOCK_SECOND_Pos;
- currentTime->tm_sec = (int)timeMask;
- timeMask = ADJUST_TM_STRUCT_MONTH(((dataClockCalendar & RTC_MODE2_CLOCK_MONTH_Msk) >> RTC_MODE2_CLOCK_MONTH_Pos));
- currentTime->tm_mon = (int)timeMask;
- timeMask = (((dataClockCalendar & RTC_MODE2_CLOCK_YEAR_Msk)>> RTC_MODE2_CLOCK_YEAR_Pos) + REFERENCE_YEAR) - TM_STRUCT_REFERENCE_YEAR;
- currentTime->tm_year = (int)timeMask;
- timeMask = (dataClockCalendar & RTC_MODE2_CLOCK_DAY_Msk) >> RTC_MODE2_CLOCK_DAY_Pos;
- currentTime->tm_mday = (int)timeMask;
- }
- struct tm {
- int tm_sec;
- int tm_min;
- int tm_hour;
- int tm_mday;
- int tm_mon;
- int tm_year;
- int tm_wday;
- int tm_yday;
- int tm_isdst;
- long __tm_gmtoff;
- const char *__tm_zone;
- };
经过一个晚上到中午的测试，误差很大，相差有两分钟了。
| 
楼主
