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Restore CLOCK_ACTIVETIME

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4009 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2011-10-03 12:21:20 +00:00
parent ec8c188f59
commit 87fbb3674d
1 changed files with 12 additions and 0 deletions
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12
arch/arm/src/stm32/stm32_rtc.c
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@ -80,6 +80,18 @@
* Pre-processor Definitions
************************************************************************************/
/* Configuration ********************************************************************/
/* In hi-res mode, the RTC operates at 16384Hz. Overflow interrupts are handled
* when the 32-bit RTC counter overflows every 3 days and 43 minutes. A BKP register
* is incremented on each overflow interrupt creating, effectively, a 48-bit RTC
* counter.
*
* In the lo-res mode, the RTC operates at 1Hz. Overflow interrupts are not handled
* (because the next overflow is not expected until the year 2106.
*
* WARNING: Overflow interrupts are lost whenever the STM32 is powered down. The
* overflow interrupt may be lost even if the STM32 is powered down only momentarily.
* Therefor hi-res solution is only useful in systems where the power is always on.
*/
#ifdef CONFIG_RTC_HIRES
# ifndef CONFIG_RTC_FREQUENCY