diff options
| 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/lpc24xx | |
| 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/lpc24xx')
| -rw-r--r-- | c/src/lib/libbsp/arm/lpc24xx/Makefile.am | 1 | ||||
| -rw-r--r-- | c/src/lib/libbsp/arm/lpc24xx/misc/system-clocks.c | 11 |
2 files changed, 11 insertions, 1 deletions
diff --git a/c/src/lib/libbsp/arm/lpc24xx/Makefile.am b/c/src/lib/libbsp/arm/lpc24xx/Makefile.am index 28ef7088bd..3b5c94fbc0 100644 --- a/c/src/lib/libbsp/arm/lpc24xx/Makefile.am +++ b/c/src/lib/libbsp/arm/lpc24xx/Makefile.am @@ -101,6 +101,7 @@ libbsp_a_SOURCES += ../../shared/bootcard.c \ ../../shared/sbrk.c \ ../../shared/src/stackalloc.c \ ../../shared/src/uart-output-char.c +libbsp_a_SOURCES += ../../shared/cpucounterdiff.c # Startup libbsp_a_SOURCES += ../shared/startup/bsp-start-memcpy.S diff --git a/c/src/lib/libbsp/arm/lpc24xx/misc/system-clocks.c b/c/src/lib/libbsp/arm/lpc24xx/misc/system-clocks.c index fcd56eaf28..e1ccb5899f 100644 --- a/c/src/lib/libbsp/arm/lpc24xx/misc/system-clocks.c +++ b/c/src/lib/libbsp/arm/lpc24xx/misc/system-clocks.c @@ -7,7 +7,7 @@ */ /* - * Copyright (c) 2008-2012 embedded brains GmbH. All rights reserved. + * Copyright (c) 2008-2014 embedded brains GmbH. All rights reserved. * * embedded brains GmbH * Obere Lagerstr. 30 @@ -20,6 +20,8 @@ * http://www.rtems.com/license/LICENSE. */ +#include <rtems/counter.h> + #include <bsp.h> #include <bsp/lpc24xx.h> #include <bsp/system-clocks.h> @@ -59,6 +61,13 @@ void lpc24xx_timer_initialize(void) /* Start timer */ T1TCR = TCR_EN; + + rtems_counter_initialize_converter(LPC24XX_PCLK); +} + +CPU_Counter_ticks _CPU_Counter_read(void) +{ + return lpc24xx_timer(); } void lpc24xx_micro_seconds_delay(unsigned us) |