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arch.h: Update some comments and conditional compilation

This commit is contained in:
Gregory Nutt 2015-11-20 07:13:16 -06:00
parent 9af0ee7fdb
commit b60c2519d7
1 changed files with 9 additions and 3 deletions
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12
include/nuttx/arch.h
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@ -1768,8 +1768,14 @@ size_t up_check_intstack_remain(void);
* Name: up_rtcinitialize
*
* Description:
* Initialize the hardware RTC per the selected configuration. This
* function is called once during the OS initialization sequence
* Initialize the builtin, MCU hardware RTC per the selected
* configuration. This function is called once very early in the OS
* initialization sequence
*
* NOTE that initialization of external RTC hardware that depends on the
* availability of OS resources (such as SPI or I2C) must be deferred
* until the system has fully booted. Other, RTC-specific initialization
* functions are used in that case.
*
* Input Parameters:
* None
@ -1779,7 +1785,7 @@ size_t up_check_intstack_remain(void);
*
****************************************************************************/
#ifdef CONFIG_RTC
#if defined(CONFIG_RTC) && !defined(CONFIG_RTC_EXTERNAL)
int up_rtcinitialize(void);
#endif