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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-02-12 10:31:38 +0100 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-02-14 10:28:29 +0100 |
commit | 24bf11eca11947d961cc9bb5f7d92dabff169e93 (patch) | |
tree | b28f3aa8a21df91e8feaf324613aa76460559837 /c/src/lib/libbsp/shared/cpucounterread.c | |
parent | bsps/arm: Fix Cortex-A9 MPCore nanoseconds handler (diff) | |
download | rtems-24bf11eca11947d961cc9bb5f7d92dabff169e93.tar.bz2 |
score: Add CPU counter support
Add a CPU counter interface to allow access to a free-running counter.
It is useful to measure short time intervals. This can be used for
example to enable profiling of critical low-level functions.
Add two busy wait functions rtems_counter_delay_ticks() and
rtems_counter_delay_nanoseconds() implemented via the CPU counter.
Diffstat (limited to 'c/src/lib/libbsp/shared/cpucounterread.c')
-rw-r--r-- | c/src/lib/libbsp/shared/cpucounterread.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/shared/cpucounterread.c b/c/src/lib/libbsp/shared/cpucounterread.c new file mode 100644 index 0000000000..0a09376b63 --- /dev/null +++ b/c/src/lib/libbsp/shared/cpucounterread.c @@ -0,0 +1,27 @@ +/* + * Copyright (c) 2014 embedded brains GmbH. All rights reserved. + * + * embedded brains GmbH + * Dornierstr. 4 + * 82178 Puchheim + * Germany + * <rtems@embedded-brains.de> + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.com/license/LICENSE. + */ + +#include <rtems/score/cpu.h> + +CPU_Counter_ticks _CPU_Counter_read( void ) +{ + static CPU_Counter_ticks counter; + + CPU_Counter_ticks snapshot; + + snapshot = counter; + counter = snapshot + 1; + + return snapshot; +} |