diff options
Diffstat (limited to 'c/src/lib/libbsp/arm/tms570/misc')
-rw-r--r-- | c/src/lib/libbsp/arm/tms570/misc/cpucounterread.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/arm/tms570/misc/cpucounterread.c b/c/src/lib/libbsp/arm/tms570/misc/cpucounterread.c new file mode 100644 index 0000000000..f25380cc85 --- /dev/null +++ b/c/src/lib/libbsp/arm/tms570/misc/cpucounterread.c @@ -0,0 +1,44 @@ +/** + * @file + * + * @ingroup tms570_clocks + * + * @brief System clocks. + */ + +/* + * Copyright (c) 2014 Pavel Pisa <pisa@cmp.felk.cvut.cz> + * + * Czech Technical University in Prague + * Zikova 1903/4 + * 166 36 Praha 6 + * Czech Republic + * + * Based on LPC24xx and LPC1768 BSP + * by embedded brains GmbH and others + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +#include <stdlib.h> + +#include <rtems.h> +#include <bsp.h> + + +/** + * @brief returns the actual value of Cortex-R cycle counter register + * + * The register is incremented at each core clock period + * + * @retval x actual core clock counter value + * + */ +CPU_Counter_ticks _CPU_Counter_read(void) +{ + uint32_t ticks; + asm volatile ("mrc p15, 0, %0, c9, c13, 0\n": "=r" (ticks)); + return ticks; +} |