1 /* ----------------------------------------------------------------------------
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2 * SAM Software Package License
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3 * ----------------------------------------------------------------------------
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4 * Copyright (c) 2012, 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 * Provides the low-level initialization function that called on chip startup.
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36 /*----------------------------------------------------------------------------
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38 *----------------------------------------------------------------------------*/
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42 /*----------------------------------------------------------------------------
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43 * Internal functions
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44 *----------------------------------------------------------------------------*/
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46 * \brief Default spurious interrupt handler. Infinite loop.
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48 void defaultSpuriousHandler( void )
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54 * \brief Default handler for fast interrupt requests. Infinite loop.
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56 void defaultFiqHandler( void )
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62 * \brief Default handler for standard interrupt requests. Infinite loop.
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64 void defaultIrqHandler( void )
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70 * \brief Performs the low-level initialization of the chip.
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71 * This includes EFC and master clock configuration.
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72 * It also enable a low level on the pin NRST triggers a user reset.
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74 extern WEAK void LowLevelInit( void )
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77 if ((uint32_t)LowLevelInit < DDR_CS_ADDR) /* Code not in external mem */ {
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78 PMC_SelectExt12M_Osc();
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79 PMC_SwitchMck2Main();
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80 PMC_SetPllA( CKGR_PLLAR_STUCKTO1 |
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81 CKGR_PLLAR_PLLACOUNT(0x3F) |
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82 CKGR_PLLAR_OUTA(0x0) |
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83 CKGR_PLLAR_MULA(65) |
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86 PMC_SetMckPllaDiv(PMC_MCKR_PLLADIV2_DIV2);
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87 PMC_SetMckPrescaler(PMC_MCKR_PRES_CLOCK);
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88 PMC_SetMckDivider(PMC_MCKR_MDIV_PCK_DIV3);
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89 PMC_SwitchMck2Pll();
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94 /* Configure PCK1 to measure MCK */
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95 PIOD->PIO_IDR = (1<<31);
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96 abcdsr = PIOD->PIO_ABCDSR[0];
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97 PIOD->PIO_ABCDSR[0] = ((1<<31) | abcdsr);
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98 abcdsr = PIOD->PIO_ABCDSR[1];
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99 PIOD->PIO_ABCDSR[1] &= (~(1<<31) & abcdsr);
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100 PIOD->PIO_PDR = (1<<31);
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102 /* Disable programmable clock 1 output */
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103 REG_PMC_SCDR = PMC_SCER_PCK1;
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104 /* Enable the DAC master clock */
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105 PMC->PMC_PCK[1] = PMC_PCK_CSS_MCK_CLK | PMC_PCK_PRES_CLOCK;
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106 /* Enable programmable clock 1 output */
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107 REG_PMC_SCER = PMC_SCER_PCK1;
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108 /* Wait for the PCKRDY1 bit to be set in the PMC_SR register*/
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109 while ((REG_PMC_SR & PMC_SR_PCKRDY1) == 0);
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113 AIC->AIC_SVR = (unsigned int) defaultFiqHandler;
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115 for (i = 1; i < 31; i++)
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118 AIC->AIC_SVR = (unsigned int) defaultIrqHandler;
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121 AIC->AIC_SPU = (unsigned int) defaultSpuriousHandler;
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123 /* Disable all interrupts */
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124 for (i = 1; i < 31; i++)
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127 AIC->AIC_IDCR = 1 ;
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129 /* Clear All pending interrupts flags */
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130 for (i = 1; i < 31; i++)
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133 AIC->AIC_ICCR = 1 ;
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135 /* Perform 8 IT acknoledge (write any value in EOICR) */
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136 for (i = 0; i < 8 ; i++)
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138 AIC->AIC_EOICR = 0;
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