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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [CORTEX_AT91SAM3U256_IAR/] [AT91Lib/] [peripherals/] [rtt/] [rtt.c] - Rev 580
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/* ---------------------------------------------------------------------------- * ATMEL Microcontroller Software Support * ---------------------------------------------------------------------------- * Copyright (c) 2008, Atmel Corporation * * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the disclaimer below. * * Atmel's name may not be used to endorse or promote products derived from * this software without specific prior written permission. * * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE * DISCLAIMED. IN NO EVENT SHALL ATMEL 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. * ---------------------------------------------------------------------------- */ //------------------------------------------------------------------------------ // Headers //------------------------------------------------------------------------------ #include "rtt.h" #include <utility/assert.h> //------------------------------------------------------------------------------ // Exported functions //------------------------------------------------------------------------------ //------------------------------------------------------------------------------ /// Changes the prescaler value of the given RTT and restarts it. This function /// disables RTT interrupt sources. /// \param rtt Pointer to a AT91S_RTTC instance. /// \param prescaler Prescaler value for the RTT. //------------------------------------------------------------------------------ void RTT_SetPrescaler(AT91S_RTTC *rtt, unsigned short prescaler) { rtt->RTTC_RTMR = (prescaler | AT91C_RTTC_RTTRST); } //------------------------------------------------------------------------------ /// Returns the current value of the RTT timer value. /// \param rtt Pointer to a AT91S_RTTC instance. //------------------------------------------------------------------------------ unsigned int RTT_GetTime(AT91S_RTTC *rtt) { return rtt->RTTC_RTVR; } //------------------------------------------------------------------------------ /// Enables the specified RTT interrupt sources. /// \param rtt Pointer to a AT91S_RTTC instance. /// \param sources Bitmask of interrupts to enable. //------------------------------------------------------------------------------ void RTT_EnableIT(AT91S_RTTC *rtt, unsigned int sources) { ASSERT((sources & 0x0004FFFF) == 0, "RTT_EnableIT: Wrong sources value.\n\r"); rtt->RTTC_RTMR |= sources; } //------------------------------------------------------------------------------ /// Returns the status register value of the given RTT. /// \param rtt Pointer to an AT91S_RTTC instance. //------------------------------------------------------------------------------ unsigned int RTT_GetStatus(AT91S_RTTC *rtt) { return rtt->RTTC_RTSR; } //------------------------------------------------------------------------------ /// Configures the RTT to generate an alarm at the given time. /// \param pRtt Pointer to an AT91S_RTTC instance. /// \param time Alarm time. //------------------------------------------------------------------------------ void RTT_SetAlarm(AT91S_RTTC *pRtt, unsigned int time) { SANITY_CHECK(time > 0); pRtt->RTTC_RTAR = time - 1; }