[参考译文] LP-MSPM0G3507：MSPM0G3507上的 RTC 问题-时钟运行速度比预期快[14分钟/天]。

我添加了一些代码、以便每隔一段时间打印一次时间(当然、我使用 SysConfig 激活 UART0并设置 TX 中断：

#include <stdio.h>
#include <string.h>

#include "ti_msp_dl_config.h"

// prototypes
void StartSerialTX(char *str);

bool gAlarmTriggered = false;

volatile int TXChar = -1;
char TXData[64];

int main(void) {

  uint8_t hours;
  uint8_t minutes;
  uint8_t secs;
  int count = 0;

  char sendbuf[64];
  SYSCFG_DL_init();

  NVIC_ClearPendingIRQ(UART_0_INST_INT_IRQN);
  NVIC_EnableIRQ(UART_0_INST_INT_IRQN);

  /* Enable RTC interrupts on device */
  NVIC_EnableIRQ(RTC_INT_IRQn);

  /* Set LED to indicate RTC clock enable */
  DL_GPIO_clearPins(GPIO_LEDS_PORT,
                    GPIO_LEDS_USER_LED_1_PIN | GPIO_LEDS_USER_TEST_PIN);

  /* Start RTC clock */
  DL_RTC_enableClockControl(RTC);

  sprintf(sendbuf, "Hello, World! \n\r");
  StartSerialTX(sendbuf);

  /* Wait in STANDBY0 mode for alarm to trigger */
  while (false == gAlarmTriggered) {
    __WFI();
  }

  /* After alarm has triggered, toggle LED */
  while (1) {
    DL_GPIO_togglePins(GPIO_LEDS_PORT,
                       GPIO_LEDS_USER_LED_1_PIN | GPIO_LEDS_USER_TEST_PIN);
    delay_cycles(1600000);

    if (count == 1000) {
      secs = DL_RTC_Common_getCalendarSecondsBinary(RTC);
      minutes = DL_RTC_Common_getCalendarMinutesBinary(RTC);
      hours = DL_RTC_Common_getCalendarHoursBinary(RTC);
      sprintf(sendbuf, "H: %d; M:%d S:%d\n\r", hours, minutes, secs);
      StartSerialTX(sendbuf);

      count = 0;
    }
    else if (count == 900)
    {
        strcpy(sendbuf, "GR!\n\r");
        StartSerialTX(sendbuf);

      count++;


    }

     else {
      count++;
    }
  }
}

void StartSerialTX(char *str) {

  while (TXChar != -1) {
    // wait for previous tx to finish
    delay_cycles(1000);
  }

  strcpy(TXData, str);

  TXChar = 0;

  DL_UART_Main_transmitData(UART_0_INST, TXData[TXChar++]);
}

void RTC_IRQHandler(void) {
  switch (DL_RTC_getPendingInterrupt(RTC)) {
  case DL_RTC_IIDX_ALARM1:
    /* Alarm has been triggered */
    gAlarmTriggered = true;
  default:
    break;
  }
}

void UART_0_INST_IRQHandler(void) {
  switch (DL_UART_Main_getPendingInterrupt(UART_0_INST)) {

  case DL_UART_MAIN_IIDX_RX:

    break;

  case DL_UART_MAIN_IIDX_TX:
    if (TXData[TXChar] != '\0') {
      DL_UART_Main_transmitData(UART_0_INST, TXData[TXChar++]);
    } else {
      TXChar = -1;
    }

    break;

  default:
    break;
  }
}

对于 LFOSC、我每天有7分钟的错误

我切换到板载32K 晶体、错误基本上降至0。