Question

STM32的RTC库函数中RTC_WaitForSynchro和RTC_WaitForLastTask是不是等价的？

STM32的RTC库函数中RTC_WaitForSynchro和RTC_WaitForLastTask是不是等价的？
函数功能解释是一样的，RTC配置的时候是不是调用一句就行了。

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Answer 1

不是的，两个函数的功能是不一样的，可以参考"stm32f10x_rtc.c"

/**
* @brief Waits until last write operation on RTC registers has finished.
* @note This function must be called before any write to RTC registers.
* @param None
* @retval None
*/
void RTC_WaitForLastTask(void)
{
/* Loop until RTOFF flag is set */
while ((RTC->CRL & RTC_FLAG_RTOFF) == (uint16_t)RESET)
{
}
}

/**
* @brief Waits until the RTC registers (RTC_CNT, RTC_ALR and RTC_PRL)
* are synchronized with RTC APB clock.
* @note This function must be called before any read operation after an APB reset
* or an APB clock stop.
* @param None
* @retval None
*/
void RTC_WaitForSynchro(void)
{
/* Clear RSF flag */
RTC->CRL &= (uint16_t)~RTC_FLAG_RSF;
/* Loop until RSF flag is set */
while ((RTC->CRL & RTC_FLAG_RSF) == (uint16_t)RESET)
{
}
}