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serialhdl: Load the mcu's 64bit clock at start of connection

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Store a full 64bit uptime in the mcu and query it at the start of each
connection.  This ensures the host's 64bit clock is always in synch
with the mcu's clock.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2017-03-03 22:02:27 -05:00
parent f53897758d
commit c19af4fb2b
2 changed files with 25 additions and 9 deletions
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20
src/basecmd.c
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@ -191,6 +191,17 @@ command_get_status(uint32_t *args)
}
DECL_COMMAND_FLAGS(command_get_status, HF_IN_SHUTDOWN, "get_status");
static uint32_t stats_send_time, stats_send_time_high;
void
command_get_uptime(uint32_t *args)
{
uint32_t cur = sched_read_time();
uint32_t high = stats_send_time_high + (cur < stats_send_time);
sendf("uptime high=%u clock=%u", high, cur);
}
DECL_COMMAND_FLAGS(command_get_uptime, HF_IN_SHUTDOWN, "get_uptime");
#define SUMSQ_BASE 256
DECL_CONSTANT(STATS_SUMSQ_BASE, SUMSQ_BASE);
@ -215,11 +226,12 @@ stats_task(void)
nextsumsq = 0xffffffff;
sumsq = nextsumsq;
static uint32_t prev;
if (sched_is_before(cur, prev + sched_from_us(5000000)))
if (sched_is_before(cur, stats_send_time + sched_from_us(5000000)))
return;
sendf("stats count=%u sum=%u sumsq=%u", count, cur - prev, sumsq);
prev = cur;
sendf("stats count=%u sum=%u sumsq=%u", count, cur - stats_send_time, sumsq);
if (cur < stats_send_time)
stats_send_time_high++;
stats_send_time = cur;
count = sumsq = 0;
}
DECL_TASK(stats_task);