4 * Copyright (c) 2015 Atmel Corporation. All rights reserved.
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10 * Redistribution and use in source and binary forms, with or without
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11 * modification, are permitted provided that the following conditions are met:
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13 * 1. Redistributions of source code must retain the above copyright notice,
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14 * this list of conditions and the following disclaimer.
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16 * 2. Redistributions in binary form must reproduce the above copyright notice,
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17 * this list of conditions and the following disclaimer in the documentation
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18 * and/or other materials provided with the distribution.
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20 * 3. The name of Atmel may not be used to endorse or promote products derived
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21 * from this software without specific prior written permission.
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23 * 4. This software may only be redistributed and used in connection with an
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24 * Atmel microcontroller product.
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26 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
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27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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29 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
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30 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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34 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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35 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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36 * POSSIBILITY OF SUCH DAMAGE.
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42 * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
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55 /* %ATMEL_SYSTEM% */
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56 /* Clock Settings (600MHz PLL VDDIO 3.3V and VDDCORE 1.2V) */
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57 /* Clock Settings (300MHz HCLK, 150MHz MCK)=> PRESC = 2, MDIV = 2 */
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58 #define SYS_BOARD_OSCOUNT (CKGR_MOR_MOSCXTST(0x8U))
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59 #define SYS_BOARD_PLLAR (CKGR_PLLAR_ONE | CKGR_PLLAR_MULA(0x31U) | \
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60 CKGR_PLLAR_PLLACOUNT(0x3fU) | CKGR_PLLAR_DIVA(0x1U))
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61 #define SYS_BOARD_MCKR (PMC_MCKR_PRES_CLK_2 | PMC_MCKR_CSS_PLLA_CLK | (1<<8))
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63 uint32_t SystemCoreClock = CHIP_FREQ_MAINCK_RC_4MHZ;
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66 * \brief Setup the microcontroller system.
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67 * Initialize the System and update the SystemFrequency variable.
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69 void SystemInit( void )
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71 /* Set FWS according to SYS_BOARD_MCKR configuration */
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72 EFC->EEFC_FMR = EEFC_FMR_FWS(5);
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74 /* Initialize main oscillator */
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75 if ( !(PMC->CKGR_MOR & CKGR_MOR_MOSCSEL) )
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77 PMC->CKGR_MOR = CKGR_MOR_KEY_PASSWD | SYS_BOARD_OSCOUNT | CKGR_MOR_MOSCRCEN | CKGR_MOR_MOSCXTEN;
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79 while ( !(PMC->PMC_SR & PMC_SR_MOSCXTS) )
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84 /* Switch to 3-20MHz Xtal oscillator */
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85 PMC->CKGR_MOR = CKGR_MOR_KEY_PASSWD | SYS_BOARD_OSCOUNT | CKGR_MOR_MOSCRCEN | CKGR_MOR_MOSCXTEN | CKGR_MOR_MOSCSEL;
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87 while ( !(PMC->PMC_SR & PMC_SR_MOSCSELS) )
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91 PMC->PMC_MCKR = (PMC->PMC_MCKR & ~(uint32_t)PMC_MCKR_CSS_Msk) | PMC_MCKR_CSS_MAIN_CLK;
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93 while ( !(PMC->PMC_SR & PMC_SR_MCKRDY) )
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97 /* Initialize PLLA */
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98 PMC->CKGR_PLLAR = SYS_BOARD_PLLAR;
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99 while ( !(PMC->PMC_SR & PMC_SR_LOCKA) )
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103 /* Switch to main clock */
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104 PMC->PMC_MCKR = (SYS_BOARD_MCKR & ~PMC_MCKR_CSS_Msk) | PMC_MCKR_CSS_MAIN_CLK;
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105 while ( !(PMC->PMC_SR & PMC_SR_MCKRDY) )
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109 /* Switch to PLLA */
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110 PMC->PMC_MCKR = SYS_BOARD_MCKR;
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111 while ( !(PMC->PMC_SR & PMC_SR_MCKRDY) )
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115 SystemCoreClock = CHIP_FREQ_CPU_MAX;
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118 void SystemCoreClockUpdate( void )
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120 /* Determine clock frequency according to clock register values */
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121 switch (PMC->PMC_MCKR & (uint32_t) PMC_MCKR_CSS_Msk)
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123 case PMC_MCKR_CSS_SLOW_CLK: /* Slow clock */
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124 if ( SUPC->SUPC_SR & SUPC_SR_OSCSEL )
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126 SystemCoreClock = CHIP_FREQ_XTAL_32K;
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130 SystemCoreClock = CHIP_FREQ_SLCK_RC;
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134 case PMC_MCKR_CSS_MAIN_CLK: /* Main clock */
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135 if ( PMC->CKGR_MOR & CKGR_MOR_MOSCSEL )
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137 SystemCoreClock = CHIP_FREQ_XTAL_12M;
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141 SystemCoreClock = CHIP_FREQ_MAINCK_RC_4MHZ;
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143 switch ( PMC->CKGR_MOR & CKGR_MOR_MOSCRCF_Msk )
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145 case CKGR_MOR_MOSCRCF_4_MHz:
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148 case CKGR_MOR_MOSCRCF_8_MHz:
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149 SystemCoreClock *= 2U;
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152 case CKGR_MOR_MOSCRCF_12_MHz:
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153 SystemCoreClock *= 3U;
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162 case PMC_MCKR_CSS_PLLA_CLK: /* PLLA clock */
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163 if ( PMC->CKGR_MOR & CKGR_MOR_MOSCSEL )
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165 SystemCoreClock = CHIP_FREQ_XTAL_12M ;
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169 SystemCoreClock = CHIP_FREQ_MAINCK_RC_4MHZ;
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171 switch ( PMC->CKGR_MOR & CKGR_MOR_MOSCRCF_Msk )
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173 case CKGR_MOR_MOSCRCF_4_MHz:
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176 case CKGR_MOR_MOSCRCF_8_MHz:
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177 SystemCoreClock *= 2U;
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180 case CKGR_MOR_MOSCRCF_12_MHz:
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181 SystemCoreClock *= 3U;
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189 if ( (uint32_t) (PMC->PMC_MCKR & (uint32_t) PMC_MCKR_CSS_Msk) == PMC_MCKR_CSS_PLLA_CLK )
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191 SystemCoreClock *= ((((PMC->CKGR_PLLAR) & CKGR_PLLAR_MULA_Msk) >> CKGR_PLLAR_MULA_Pos) + 1U);
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192 SystemCoreClock /= ((((PMC->CKGR_PLLAR) & CKGR_PLLAR_DIVA_Msk) >> CKGR_PLLAR_DIVA_Pos));
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200 if ( (PMC->PMC_MCKR & PMC_MCKR_PRES_Msk) == PMC_MCKR_PRES_CLK_3 )
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202 SystemCoreClock /= 3U;
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206 SystemCoreClock >>= ((PMC->PMC_MCKR & PMC_MCKR_PRES_Msk) >> PMC_MCKR_PRES_Pos);
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210 * Initialize flash.
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212 void system_init_flash( uint32_t ul_clk )
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214 /* Set FWS for embedded Flash access according to operating frequency */
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215 if ( ul_clk < CHIP_FREQ_FWS_0 )
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217 EFC->EEFC_FMR = EEFC_FMR_FWS(0)|EEFC_FMR_CLOE;
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221 if (ul_clk < CHIP_FREQ_FWS_1)
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223 EFC->EEFC_FMR = EEFC_FMR_FWS(1)|EEFC_FMR_CLOE;
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227 if (ul_clk < CHIP_FREQ_FWS_2)
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229 EFC->EEFC_FMR = EEFC_FMR_FWS(2)|EEFC_FMR_CLOE;
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233 if ( ul_clk < CHIP_FREQ_FWS_3 )
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235 EFC->EEFC_FMR = EEFC_FMR_FWS(3)|EEFC_FMR_CLOE;
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239 if ( ul_clk < CHIP_FREQ_FWS_4 )
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241 EFC->EEFC_FMR = EEFC_FMR_FWS(4)|EEFC_FMR_CLOE;
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245 EFC->EEFC_FMR = EEFC_FMR_FWS(5)|EEFC_FMR_CLOE;
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