1 /* ----------------------------------------------------------------------------
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2 * ATMEL Microcontroller Software Support
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3 * ----------------------------------------------------------------------------
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4 * Copyright (c) 2008, Atmel Corporation
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6 * All rights reserved.
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions are met:
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11 * - Redistributions of source code must retain the above copyright notice,
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12 * this list of conditions and the disclaimer below.
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14 * Atmel's name may not be used to endorse or promote products derived from
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15 * this software without specific prior written permission.
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17 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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20 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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23 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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26 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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27 * ----------------------------------------------------------------------------
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30 //------------------------------------------------------------------------------
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32 //------------------------------------------------------------------------------
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35 #include <utility/assert.h>
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37 //------------------------------------------------------------------------------
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38 // Exported functions
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39 //------------------------------------------------------------------------------
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41 //------------------------------------------------------------------------------
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42 /// Changes the prescaler value of the given RTT and restarts it. This function
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43 /// disables RTT interrupt sources.
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44 /// \param rtt Pointer to a AT91S_RTTC instance.
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45 /// \param prescaler Prescaler value for the RTT.
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46 //------------------------------------------------------------------------------
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47 void RTT_SetPrescaler(AT91S_RTTC *rtt, unsigned short prescaler)
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49 rtt->RTTC_RTMR = (prescaler | AT91C_RTTC_RTTRST);
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52 //------------------------------------------------------------------------------
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53 /// Returns the current value of the RTT timer value.
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54 /// \param rtt Pointer to a AT91S_RTTC instance.
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55 //------------------------------------------------------------------------------
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56 unsigned int RTT_GetTime(AT91S_RTTC *rtt)
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58 return rtt->RTTC_RTVR;
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61 //------------------------------------------------------------------------------
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62 /// Enables the specified RTT interrupt sources.
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63 /// \param rtt Pointer to a AT91S_RTTC instance.
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64 /// \param sources Bitmask of interrupts to enable.
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65 //------------------------------------------------------------------------------
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66 void RTT_EnableIT(AT91S_RTTC *rtt, unsigned int sources)
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68 ASSERT((sources & 0x0004FFFF) == 0,
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69 "RTT_EnableIT: Wrong sources value.\n\r");
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70 rtt->RTTC_RTMR |= sources;
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73 //------------------------------------------------------------------------------
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74 /// Returns the status register value of the given RTT.
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75 /// \param rtt Pointer to an AT91S_RTTC instance.
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76 //------------------------------------------------------------------------------
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77 unsigned int RTT_GetStatus(AT91S_RTTC *rtt)
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79 return rtt->RTTC_RTSR;
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82 //------------------------------------------------------------------------------
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83 /// Configures the RTT to generate an alarm at the given time.
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84 /// \param pRtt Pointer to an AT91S_RTTC instance.
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85 /// \param time Alarm time.
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86 //------------------------------------------------------------------------------
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87 void RTT_SetAlarm(AT91S_RTTC *pRtt, unsigned int time)
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89 SANITY_CHECK(time > 0);
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91 pRtt->RTTC_RTAR = time - 1;
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