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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-02-12 10:31:38 +0100 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-02-14 10:28:29 +0100 |
| commit | 24bf11eca11947d961cc9bb5f7d92dabff169e93 (patch) | |
| tree | b28f3aa8a21df91e8feaf324613aa76460559837 /c/src/lib/libbsp/arm/shared/arm-a9mpcore-clock-config.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/arm/shared/arm-a9mpcore-clock-config.c')
| -rw-r--r-- | c/src/lib/libbsp/arm/shared/arm-a9mpcore-clock-config.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/arm/shared/arm-a9mpcore-clock-config.c b/c/src/lib/libbsp/arm/shared/arm-a9mpcore-clock-config.c index 375b392cd3..54f09fa13f 100644 --- a/c/src/lib/libbsp/arm/shared/arm-a9mpcore-clock-config.c +++ b/c/src/lib/libbsp/arm/shared/arm-a9mpcore-clock-config.c @@ -12,6 +12,8 @@ * http://www.rtems.com/license/LICENSE. */ +#include <rtems/counter.h> + #include <bsp.h> #include <bsp/irq.h> #include <bsp/arm-a9mpcore-regs.h> @@ -94,6 +96,15 @@ static void a9mpcore_clock_initialize(void) | A9MPCORE_GT_CTRL_IRQ_EN | A9MPCORE_GT_CTRL_COMP_EN | A9MPCORE_GT_CTRL_TMR_EN; + + rtems_counter_initialize_converter((uint32_t) periphclk); +} + +CPU_Counter_ticks _CPU_Counter_read(void) +{ + volatile a9mpcore_gt *gt = A9MPCORE_GT; + + return gt->cntrlower; } static void a9mpcore_clock_cleanup(void) |