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add time related function.

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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1090 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
bernard.xiong
2010-11-22 09:51:40 +00:00
parent 913a4edfb3
commit cb72c44e5a
4 changed files with 148 additions and 13 deletions
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components/libc/newlib/libc.c
+77 -13
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@@ -3,25 +3,95 @@
#include <stdlib.h>
#include <fcntl.h>
#include <sys/time.h>
#include "libc.h"
struct timeval _timevalue;
static void libc_system_time_init()
{
rt_device_t device;
time_t time;
rt_tick_t tick;
rt_device_t device;
time = 0; tick = 0;
time = 0;
device = rt_device_find("rtc");
if (device != RT_NULL)
{
/* get realtime seconds */
rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time);
}
/* get tick */
tick = rt_tick_get();
_timevalue.tv_sec = time;
_timevalue.tv_usec = (1000000UL * tick)/RT_TICK_PER_SECOND;
_timevalue.tv_usec = MICROSECOND_PER_SECOND - (tick%RT_TICK_PER_SECOND) * MICROSECOND_PER_TICK;
_timevalue.tv_sec = time - tick/RT_TICK_PER_SECOND - 1;
}
int libc_get_time(struct timespec *time)
{
rt_tick_t tick;
RT_ASSERT(time != RT_NULL);
/* get tick */
tick = rt_tick_get();
time->tv_sec = _timevalue.tv_sec + tick / RT_TICK_PER_SECOND;
time->tv_nsec = (_timevalue.tv_usec + (tick % RT_TICK_PER_SECOND) * NANOSECOND_PER_TICK) * 1000;
return 0;
}
int libc_set_time(const struct timespec *time)
{
int second;
rt_tick_t tick;
rt_device_t device;
second = time->tv_sec;
device = rt_device_find("rtc");
if (device != RT_NULL)
{
/* get realtime seconds */
rt_device_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, &second);
}
else return -1;
/* get tick */
tick = rt_tick_get();
/* update timevalue */
_timevalue.tv_usec = MICROSECOND_PER_SECOND - (tick % RT_TICK_PER_SECOND) * MICROSECOND_PER_TICK;
_timevalue.tv_sec = second - tick/RT_TICK_PER_SECOND - 1;
return 0;
}
int libc_time_to_tick(const struct timespec *time)
{
int tick;
int microsecond, second;
RT_ASSERT(time != RT_NULL);
tick = RT_WAITING_FOREVER;
if (time != NULL)
{
if ((time->tv_nsec/1000 - _timevalue.tv_usec) < 0)
{
microsecond = (1000000UL + time->tv_nsec/1000) - _timevalue.tv_usec;
second = time->tv_sec - 1;
}
else
{
microsecond = time->tv_nsec/1000 - _timevalue.tv_usec;
second = time->tv_sec;
}
tick = second * RT_TICK_PER_SECOND + microsecond * RT_TICK_PER_SECOND / MICROSECOND_PER_SECOND;
if (tick < 0) tick = 0;
}
return tick;
}
void libc_system_init(const char* tty_name)
@@ -39,13 +109,7 @@ void libc_system_init(const char* tty_name)
/* set PATH and HOME */
putenv("PATH=/");
putenv("HOME=/");
}
int libc_time_to_tick(const struct timespec *time)
{
int tick;
tick = RT_WAITING_FOREVER;
return tick;
/* initialize system time */
libc_system_time_init();
}