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drivers/timers:Arch_alarm and arch_timer add up_ndelay interface

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Signed-off-by: liwenxiang1 <liwenxiang1@xiaomi.com>
This commit is contained in:
liwenxiang1 2024-10-09 19:28:45 +08:00 • committed by Xiang Xiao
parent 47fc3a67f7
commit fa48d9e972
3 changed files with 35 additions and 4 deletions
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23
drivers/timers/arch_alarm.c
View file

@ -50,14 +50,14 @@ static clock_t g_current_tick;
* Private Functions
****************************************************************************/
static void udelay_accurate(useconds_t microseconds)
static void ndelay_accurate(unsigned long nanoseconds)
{
struct timespec now;
struct timespec end;
struct timespec delta;
ONESHOT_CURRENT(g_oneshot_lower, &now);
clock_nsec2time(&delta, (uint64_t)microseconds * NSEC_PER_USEC);
clock_nsec2time(&delta, nanoseconds);
clock_timespec_add(&now, &delta, &end);
while (clock_timespec_compare(&now, &end) < 0)
@ -426,13 +426,28 @@ void weak_function up_mdelay(unsigned int milliseconds)
****************************************************************************/
void weak_function up_udelay(useconds_t microseconds)
{
up_ndelay(NSEC_PER_USEC * microseconds);
}
/****************************************************************************
* Name: up_ndelay
*
* Description:
* Delay inline for the requested number of nanoseconds.
*
* *** NOT multi-tasking friendly ***
*
****************************************************************************/
void weak_function up_ndelay(unsigned long nanoseconds)
{
if (g_oneshot_lower != NULL)
{
udelay_accurate(microseconds);
ndelay_accurate(nanoseconds);
}
else /* Oneshot timer hasn't been initialized yet */
{
udelay_coarse(microseconds);
udelay_coarse((nanoseconds + NSEC_PER_USEC - 1) / NSEC_PER_USEC);
}
}

15
drivers/timers/arch_timer.c
View file

@ -466,3 +466,18 @@ void weak_function up_udelay(useconds_t microseconds)
udelay_coarse(microseconds);
}
}
/****************************************************************************
* Name: up_ndelay
*
* Description:
* Delay inline for the requested number of nanoseconds.
*
* *** NOT multi-tasking friendly ***
*
****************************************************************************/
void weak_function up_ndelay(unsigned long nanoseconds)
{
up_udelay((nanoseconds + NSEC_PER_USEC - 1) / NSEC_PER_USEC);
}

1
include/nuttx/arch.h
View file

@ -2363,6 +2363,7 @@ char up_romgetc(FAR const char *ptr);
void up_mdelay(unsigned int milliseconds);
void up_udelay(useconds_t microseconds);
void up_ndelay(unsigned long nanoseconds);
/****************************************************************************
* These are standard interfaces that are exported by the OS for use by the