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jeremybenn |
/* ----------------------------------------------------------------------------
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* ATMEL Microcontroller Software Support
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* ----------------------------------------------------------------------------
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* Copyright (c) 2008, Atmel Corporation
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the disclaimer below.
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*
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* Atmel's name may not be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* ----------------------------------------------------------------------------
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*/
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//------------------------------------------------------------------------------
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// Headers
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//------------------------------------------------------------------------------
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#include "rtt.h"
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#include <utility/assert.h>
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//------------------------------------------------------------------------------
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// Exported functions
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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/// Changes the prescaler value of the given RTT and restarts it. This function
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/// disables RTT interrupt sources.
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/// \param rtt Pointer to a AT91S_RTTC instance.
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/// \param prescaler Prescaler value for the RTT.
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//------------------------------------------------------------------------------
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void RTT_SetPrescaler(AT91S_RTTC *rtt, unsigned short prescaler)
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{
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rtt->RTTC_RTMR = (prescaler | AT91C_RTTC_RTTRST);
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}
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//------------------------------------------------------------------------------
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/// Returns the current value of the RTT timer value.
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/// \param rtt Pointer to a AT91S_RTTC instance.
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//------------------------------------------------------------------------------
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unsigned int RTT_GetTime(AT91S_RTTC *rtt)
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{
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return rtt->RTTC_RTVR;
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}
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//------------------------------------------------------------------------------
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/// Enables the specified RTT interrupt sources.
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/// \param rtt Pointer to a AT91S_RTTC instance.
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/// \param sources Bitmask of interrupts to enable.
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//------------------------------------------------------------------------------
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void RTT_EnableIT(AT91S_RTTC *rtt, unsigned int sources)
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{
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ASSERT((sources & 0x0004FFFF) == 0,
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"RTT_EnableIT: Wrong sources value.\n\r");
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rtt->RTTC_RTMR |= sources;
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}
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//------------------------------------------------------------------------------
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/// Returns the status register value of the given RTT.
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/// \param rtt Pointer to an AT91S_RTTC instance.
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//------------------------------------------------------------------------------
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unsigned int RTT_GetStatus(AT91S_RTTC *rtt)
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{
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return rtt->RTTC_RTSR;
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}
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//------------------------------------------------------------------------------
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/// Configures the RTT to generate an alarm at the given time.
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/// \param pRtt Pointer to an AT91S_RTTC instance.
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/// \param time Alarm time.
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//------------------------------------------------------------------------------
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void RTT_SetAlarm(AT91S_RTTC *pRtt, unsigned int time)
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{
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SANITY_CHECK(time > 0);
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pRtt->RTTC_RTAR = time - 1;
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}
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