/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSBSPsARMLPC176X_clocks
*
* @brief System clocks.
*/
/*
* Copyright (c) 2008, 2009 embedded brains GmbH. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef LIBBSP_ARM_LPC176X_SYSTEM_CLOCKS_H
#define LIBBSP_ARM_LPC176X_SYSTEM_CLOCKS_H
#include <bsp/lpc176x.h>
#include <bsp/timer-defs.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/**
* @defgroup lpc176x_clock System Clocks
*
* @ingroup RTEMSBSPsARMLPC176X
*
* @brief System clocks.
*
* @{
*/
/**
* @brief Initializes the standard timer.
*
* This function uses Timer 1.
*/
void lpc176x_timer_initialize( void );
/**
* @brief Returns current standard timer value in CPU clocks.
*
* @return This function uses Timer 1.
*/
static inline unsigned lpc176x_get_timer1( void )
{
return LPC176X_T1TC;
}
/**
* @brief Delay for @a us micro seconds.
*
* This function uses the standard timer and assumes that the CPU
* frequency is in whole MHz numbers. The delay value @a us will be
* converted to CPU ticks and there is no protection against integer
* overflows.
*
* This function uses Timer 1.
*/
void lpc176x_micro_seconds_delay( unsigned us );
/**
* @brief Returns the PLL output clock frequency in [Hz].
*
* @return Returns zero in case of an unexpected PLL input frequency.
*/
unsigned lpc176x_pllclk( void );
/**
* @brief Returns the CPU clock frequency in [Hz].
*
* @return Returns zero in case of an unexpected PLL input frequency.
*/
unsigned lpc176x_cclk( void );
/** @} */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* LIBBSP_ARM_LPC176X_SYSTEM_CLOCKS_H */
