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/*
* Copyright (c) 2011, 2018 Sebastian Huber. 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.org/license/LICENSE.
*/
#ifndef BSP_CLOCK_ARMV7M_H
#define BSP_CLOCK_ARMV7M_H
#include <rtems/score/armv7m.h>
#include <rtems/timecounter.h>
#include <bsp.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#ifdef ARM_MULTILIB_ARCH_V7M
typedef struct {
struct timecounter base;
uint32_t ticks;
} ARMV7M_Timecounter;
extern ARMV7M_Timecounter _ARMV7M_TC;
static inline uint32_t _ARMV7M_Clock_frequency(void)
{
#ifdef BSP_ARMV7M_SYSTICK_FREQUENCY
return BSP_ARMV7M_SYSTICK_FREQUENCY;
#else
volatile ARMV7M_Systick *systick = _ARMV7M_Systick;
return ARMV7M_SYSTICK_CALIB_TENMS_GET(systick->calib) * 100;
#endif
}
static uint32_t _ARMV7M_Clock_counter(ARMV7M_Timecounter *tc)
{
volatile ARMV7M_Systick *systick;
rtems_interrupt_level level;
uint32_t interval;
uint32_t counter;
uint32_t ticks;
uint32_t csr;
rtems_interrupt_disable(level);
systick = _ARMV7M_Systick;
counter = systick->cvr;
csr = systick->csr;
interval = systick->rvr;
ticks = tc->ticks;
if (RTEMS_PREDICT_FALSE((csr & ARMV7M_SYSTICK_CSR_COUNTFLAG) != 0)) {
counter = systick->cvr;
ticks += interval;
tc->ticks = ticks;
}
counter = interval - counter + ticks;
rtems_interrupt_enable(level);
return counter;
}
#endif /* ARM_MULTILIB_ARCH_V7M */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* BSP_CLOCK_ARMV7M_H */
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