1 /* ----------------------------------------------------------------------------
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2 * SAM Software Package License
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3 * ----------------------------------------------------------------------------
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4 * Copyright (c) 2011, 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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33 /*------------------------------------------------------------------------------
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35 *------------------------------------------------------------------------------*/
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39 /*----------------------------------------------------------------------------
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40 * Exported functions
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41 *----------------------------------------------------------------------------*/
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48 * \brief Initialize the Periodic Interval Timer to generate a tick at the
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49 * specified period, given the current master clock frequency.
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51 * \param period Period in micro seconds.
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53 extern void pit_init(uint32_t period);
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56 * \brief Set the Periodic Interval Value of the PIT.
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58 * \param piv PIV value to set.
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60 extern void pit_set_piv(uint32_t piv);
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63 * \brief Enables the PIT if this is not already the case.
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66 extern void pit_enable(void);
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69 * \brief Disnables the PIT when PIV value is reached.
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72 extern void pit_disable(void);
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75 * \brief Enable the PIT periodic interrupt.
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78 extern void pit_enable_it(void);
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81 * \brief Disables the PIT periodic interrupt.
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84 extern void pit_disable_it(void);
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87 * \brief Returns the value of the PIT mode register.
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89 * \return PIT_MR value.
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91 extern uint32_t pit_get_mode(void);
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94 * \brief Returns the value of the PIT status register, clearing it as
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97 * \return PIT_SR value.
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99 extern uint32_t pit_get_status(void);
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102 * \brief Returns the value of the PIT Image Register, to read PICNT
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103 * and CPIV without clearing the current values.
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105 * \return PIT_PIIR value.
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107 extern uint32_t pit_get_piir(void);
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110 * \brief Returns the value of the PIT Value Register, clearing it as
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113 * \return PITC_PIVR value.
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115 extern uint32_t pit_get_pivr(void);
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121 #endif /* #ifndef _PIT_H_ */
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