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Fix calculations using MSEC_PER_TICK. If USEC_PER_TICK is less than 1000, then MSEC_PER_TICK will be zero. It will be inaccurate in any case.

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This commit is contained in:
Gregory Nutt
2016-09-25 08:17:33 -06:00
parent 25cd684012
commit 0908a6c6b9
4 changed files with 8 additions and 9 deletions
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drivers/net/slip.c
+6 -6
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@@ -434,8 +434,8 @@ static void slip_txtask(int argc, FAR char *argv[])
FAR struct slip_driver_s *priv;
unsigned int index = *(argv[1]) - '0';
net_lock_t flags;
systime_t msec_start;
systime_t msec_now;
systime_t start_ticks;
systime_t now_ticks;
unsigned int hsec;
nerr("index: %d\n", index);
@@ -450,7 +450,7 @@ static void slip_txtask(int argc, FAR char *argv[])
/* Loop forever */
msec_start = clock_systimer() * MSEC_PER_TICK;
start_ticks = clock_systimer();
for (; ; )
{
/* Wait for the timeout to expire (or until we are signaled by by */
@@ -484,14 +484,14 @@ static void slip_txtask(int argc, FAR char *argv[])
/* Has a half second elapsed since the last timer poll? */
msec_now = clock_systimer() * MSEC_PER_TICK;
hsec = (unsigned int)(msec_now - msec_start) / (MSEC_PER_SEC / 2);
now_ticks = clock_systimer();
hsec = (unsigned int)(now_ticks - start_ticks) / TICK_PER_HSEC;
if (hsec)
{
/* Yes, perform the timer poll */
(void)devif_timer(&priv->dev, slip_txpoll);
msec_start += hsec * (MSEC_PER_SEC / 2);
start_ticks += hsec * TICK_PER_HSEC;
}
else
{