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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32 * Implement simple PIT usage as system tick.
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35 /*----------------------------------------------------------------------------
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37 *----------------------------------------------------------------------------*/
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41 /*----------------------------------------------------------------------------
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43 *----------------------------------------------------------------------------*/
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45 /** Tick Counter united by ms */
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46 static volatile uint32_t _dwTickCount = 0 ;
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48 /*----------------------------------------------------------------------------
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49 * Exported Functions
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50 *----------------------------------------------------------------------------*/
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53 * \brief Handler for Sytem Tick interrupt.
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55 extern void TimeTick_Increment( uint32_t dwInc )
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57 _dwTickCount += dwInc;
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61 * \brief Configures the PIT & reset tickCount.
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62 * Systick interrupt handler will generates 1ms interrupt and increase a
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64 * \note IRQ handler must be configured before invoking this function.
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65 * \note PIT is enabled automatically in this function.
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66 * \param new_mck Current master clock.
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68 extern uint32_t TimeTick_Configure( uint32_t new_mck )
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71 PIT_Init( 1000, new_mck / 1000000 );
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78 * Get Delayed number of tick
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79 * \param startTick Start tick point.
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80 * \param endTick End tick point.
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82 extern uint32_t GetDelayInTicks(uint32_t startTick, uint32_t endTick)
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84 if (endTick >= startTick) return (endTick - startTick);
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85 return (endTick + (0xFFFFFFFF - startTick) + 1);
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89 * \brief Get current Tick Count, in ms.
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91 extern uint32_t GetTickCount( void )
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93 return _dwTickCount ;
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97 * \brief Sync Wait for several ms
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99 extern void Wait( volatile uint32_t dwMs )
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102 uint32_t dwCurrent ;
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104 dwStart = _dwTickCount ;
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107 dwCurrent = _dwTickCount ;
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108 } while ( dwCurrent - dwStart < dwMs ) ;
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112 * \brief Sync Sleep for several ms
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114 extern void Sleep( volatile uint32_t dwMs )
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117 uint32_t dwCurrent ;
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119 dwStart = _dwTickCount ;
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123 dwCurrent = _dwTickCount ;
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125 if ( dwCurrent - dwStart > dwMs )
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