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stlink: Use callback to increase frequency of trace data sampling

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The ST-LINK/V2 has limited internal buffering, such that trace data
can be missed if the target is generating data at a rate quicker than
the OpenOCD trace sampling. The issue of lost data is compounded since
individual TPIU packets may be split across individual STLINK_TRACE_EP
reads, and misleading results can occur if mid-packet loss occurs.

This patch increases the frequency of checking for pending trace data
with the aim of minimising such losses. Note: With the limited (I/O
and memory) bandwidth of the ST-LINK/V2 there cannot, however, be a
guarantee against trace data loss.

The timer callback is only added when enabling tracing, and is removed
when tracing is disabled.

Change-Id: Ibde9794b77793d3068f88cb5c1a26f9ceadcbd8a
Signed-off-by: James G. Smith <jsmith@ecoscentric.com>
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/1661
Tested-by: jenkins
This commit is contained in:
Andreas Fritiofson
2014-03-07 20:08:31 +01:00
parent d82490adfb
commit 17fddb4289
3 changed files with 20 additions and 4 deletions
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2
src/target/target.h
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@@ -328,7 +328,7 @@ int target_call_event_callbacks(struct target *target, enum target_event event);
*/
int target_register_timer_callback(int (*callback)(void *priv),
int time_ms, int periodic, void *priv);
int target_unregister_timer_callback(int (*callback)(void *priv), void *priv);
int target_call_timer_callbacks(void);
/**
* Invoke this to ensure that e.g. polling timer callbacks happen before