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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [CORTEX_AT91SAM3U256_IAR/] [AT91Lib/] [peripherals/] [rtt/] [rtt.c] - Blame information for rev 580

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1 580 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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