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/**
* @file
*
* @ingroup RTEMSBSPsARMLPC24XX_clocks
*
* @brief System clocks.
*/
/*
* Copyright (c) 2008, 2009
* embedded brains GmbH
* Obere Lagerstr. 30
* D-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 LIBBSP_ARM_LPC24XX_SYSTEM_CLOCKS_H
#define LIBBSP_ARM_LPC24XX_SYSTEM_CLOCKS_H
#include <bsp/lpc24xx.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/**
* @defgroup lpc24xx_clock System Clocks
*
* @ingroup RTEMSBSPsARMLPC24XX
*
* @brief System clocks.
*
* @{
*/
/**
* @brief Initializes the standard timer.
*
* This function uses Timer 1.
*/
void lpc24xx_timer_initialize(void);
/**
* @brief Returns current standard timer value in CPU clocks.
*
* This function uses Timer 1.
*/
static inline unsigned lpc24xx_timer(void)
{
return 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 lpc24xx_micro_seconds_delay(unsigned us);
/**
* @brief Returns the PLL output clock frequency in [Hz].
*
* Returns zero in case of an unexpected PLL input frequency.
*/
unsigned lpc24xx_pllclk(void);
/**
* @brief Returns the CPU clock frequency in [Hz].
*
* Returns zero in case of an unexpected PLL input frequency.
*/
unsigned lpc24xx_cclk(void);
/** @} */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* LIBBSP_ARM_LPC24XX_SYSTEM_CLOCKS_H */
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