1 | /** |
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2 | * @file bspstarthooks.c |
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3 | * |
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4 | * @ingroup lpc176x |
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5 | * |
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6 | * @brief First configurations and initializations to the correct |
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7 | * functionality of the board. |
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8 | */ |
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9 | |
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10 | /* |
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11 | * Copyright (c) 2014 Taller Technologies. |
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12 | * |
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13 | * @author Boretto Martin (martin.boretto@tallertechnologies.com) |
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14 | * @author Diaz Marcos (marcos.diaz@tallertechnologies.com) |
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15 | * @author Lenarduzzi Federico (federico.lenarduzzi@tallertechnologies.com) |
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16 | * @author Daniel Chicco (daniel.chicco@tallertechnologies.com) |
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17 | * |
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18 | * The license and distribution terms for this file may be |
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19 | * found in the file LICENSE in this distribution or at |
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20 | * http://www.rtems.org/license/LICENSE. |
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21 | */ |
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22 | |
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23 | #include <bsp.h> |
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24 | #include <bsp/start.h> |
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25 | #include <bsp/io.h> |
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26 | |
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27 | /** |
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28 | * @brief Initializes the oscillator according to the lpc176x board. |
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29 | */ |
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30 | static BSP_START_TEXT_SECTION void lpc176x_init_main_oscillator( void ) |
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31 | { |
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32 | if ( ( LPC176X_SCB.scs & LPC176X_SCB_SCS_OSC_STATUS ) == 0u ) { |
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33 | LPC176X_SCB.scs |= LPC176X_SCB_SCS_OSC_ENABLE; |
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34 | |
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35 | while ( ( LPC176X_SCB.scs & LPC176X_SCB_SCS_OSC_STATUS ) == 0u ) { |
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36 | /* Wait. */ |
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37 | } |
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38 | } |
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39 | |
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40 | /* else implies that the oscillator is initialized. Also, |
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41 | there is nothing to do. */ |
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42 | } |
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43 | |
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44 | /** |
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45 | * @brief Sets the PLL configuration. |
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46 | * |
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47 | * @param pll Value to set. |
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48 | * @param val Set value. |
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49 | */ |
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50 | static BSP_START_TEXT_SECTION void lpc176x_pll_config( const uint32_t val ) |
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51 | { |
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52 | ( LPC176X_SCB.pll_0 ).con = val; |
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53 | /* The two register writes must be in correct sequence. */ |
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54 | ( LPC176X_SCB.pll_0 ).feed = LPC176X_PLL0CON; |
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55 | ( LPC176X_SCB.pll_0 ).feed = LPC176X_PLL0CFG; |
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56 | } |
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57 | |
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58 | /** |
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59 | * @brief Sets the PLL. |
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60 | * |
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61 | * @param msel Multiplier value. |
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62 | * @param psel Divider value. |
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63 | * @param cclkdiv Divisor clock. |
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64 | */ |
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65 | static BSP_START_TEXT_SECTION void lpc176x_set_pll( |
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66 | const unsigned msel, |
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67 | const unsigned psel, |
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68 | const unsigned cclkdiv |
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69 | ) |
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70 | { |
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71 | const uint32_t pllcfg = LPC176X_PLL_SEL_MSEL( msel ) | |
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72 | LPC176X_PLL_SEL_PSEL( psel ); |
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73 | const uint32_t pllstat = LPC176X_PLL_STAT_PLLE | LPC176X_PLL_STAT_PLOCK | |
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74 | pllcfg; |
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75 | const uint32_t cclksel_cclkdiv = LPC176X_SCB_CCLKSEL_CCLKDIV( cclkdiv ); |
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76 | |
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77 | if ( ( LPC176X_SCB.pll_0 ).stat != pllstat |
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78 | || LPC176X_SCB.cclksel != cclksel_cclkdiv |
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79 | || LPC176X_SCB.clksrcsel != LPC176X_SCB_CLKSRCSEL_CLKSRC ) { |
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80 | lpc176x_pll_config( ( LPC176X_SCB.pll_0 ).con & ~LPC176X_PLL_CON_PLLC ); |
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81 | |
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82 | /* Turn off USB. */ |
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83 | LPC176X_SCB.usbclksel = 0u; |
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84 | |
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85 | /* Disable PLL. */ |
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86 | lpc176x_pll_config( 0u ); |
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87 | |
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88 | /* Use SYSCLK for CCLK. */ |
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89 | LPC176X_SCB.cclksel = LPC176X_SCB_CCLKSEL_CCLKDIV( 0u ); |
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90 | |
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91 | /* Set the CCLK, PCLK and EMCCLK divider. */ |
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92 | LPC176X_SCB.cclksel = cclksel_cclkdiv; |
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93 | |
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94 | /* Select main oscillator as clock source. */ |
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95 | LPC176X_SCB.clksrcsel = LPC176X_SCB_CLKSRCSEL_CLKSRC; |
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96 | |
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97 | /* The two register writes must be in correct sequence. */ |
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98 | /* Set PLL configuration. */ |
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99 | ( LPC176X_SCB.pll_0 ).cfg = pllcfg; |
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100 | ( LPC176X_SCB.pll_0 ).feed = LPC176X_PLL0CON; |
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101 | ( LPC176X_SCB.pll_0 ).feed = LPC176X_PLL0CFG; |
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102 | |
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103 | /* Enable PLL. */ |
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104 | lpc176x_pll_config( LPC176X_PLL_CON_PLLE ); |
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105 | |
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106 | /* Wait for lock. */ |
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107 | while ( ( ( LPC176X_SCB.pll_0 ).stat & LPC176X_PLL_STAT_PLOCK ) == 0u ) { |
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108 | /* Wait */ |
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109 | } |
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110 | |
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111 | /* Connect PLL. */ |
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112 | lpc176x_pll_config( ( LPC176X_PLL_CON_PLLE | LPC176X_PLL_CON_PLLC ) ); |
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113 | |
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114 | /* Wait for connected and enabled. */ |
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115 | while ( ( ( LPC176X_SCB.pll_0 ).stat & ( LPC176X_PLL_STAT_PLLE | |
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116 | LPC176X_PLL_STAT_PLLC ) ) == |
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117 | 0u ) { |
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118 | /* Wait */ |
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119 | } |
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120 | } |
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121 | |
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122 | /* else implies that the pll has a wrong value. Also, |
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123 | there is nothing to do. */ |
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124 | } |
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125 | |
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126 | /** |
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127 | * @brief Pll initialization. |
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128 | */ |
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129 | static BSP_START_TEXT_SECTION void lpc176x_init_pll( void ) |
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130 | { |
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131 | #if ( LPC176X_OSCILLATOR_MAIN == 12000000u ) |
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132 | #if ( LPC176X_CCLK == 96000000U ) |
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133 | lpc176x_set_pll( 11u, 0u, 2u ); |
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134 | #else |
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135 | #error "unexpected CCLK" |
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136 | #endif |
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137 | #else |
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138 | #error "unexpected main oscillator frequency" |
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139 | #endif |
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140 | } |
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141 | |
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142 | /** |
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143 | * @brief Memory map initialization. |
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144 | */ |
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145 | static BSP_START_TEXT_SECTION void lpc176x_init_memory_map( void ) |
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146 | { |
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147 | LPC176X_SCB.memmap = LPC176X_SCB_MEMMAP_MAP; |
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148 | } |
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149 | |
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150 | /** |
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151 | * @brief Memory accelerator initialization. |
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152 | */ |
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153 | static BSP_START_TEXT_SECTION void lpc176x_init_memory_accelerator( void ) |
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154 | { |
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155 | #if ( LPC176X_CCLK <= 20000000U ) |
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156 | LPC176X_SCB.flashcfg = LPC176X_SCB_FLASHCFG_FLASHTIM( 0x0U ); |
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157 | #elif ( LPC176X_CCLK <= 40000000U ) |
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158 | LPC176X_SCB.flashcfg = LPC176X_SCB_FLASHCFG_FLASHTIM( 0x1U ); |
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159 | #elif ( LPC176X_CCLK <= 60000000U ) |
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160 | LPC176X_SCB.flashcfg = LPC176X_SCB_FLASHCFG_FLASHTIM( 0x2U ); |
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161 | #elif ( LPC176X_CCLK <= 80000000U ) |
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162 | LPC176X_SCB.flashcfg = LPC176X_SCB_FLASHCFG_FLASHTIM( 0x3U ); |
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163 | #elif ( LPC176X_CCLK <= 100000000U ) |
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164 | LPC176X_SCB.flashcfg = LPC176X_SCB_FLASHCFG_FLASHTIM( 0x4U ); |
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165 | #else |
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166 | LPC176X_SCB.flashcfg = LPC176X_SCB_FLASHCFG_FLASHTIM( 0x5U ); |
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167 | #endif |
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168 | } |
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169 | |
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170 | /** |
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171 | * @brief Stops the gpdma device. |
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172 | */ |
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173 | static BSP_START_TEXT_SECTION void lpc176x_stop_gpdma( void ) |
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174 | { |
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175 | #ifdef LPC176X_STOP_GPDMA |
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176 | |
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177 | bool has_power = ( LPC176X_SCB.pconp & LPC176X_SCB_PCONP_GPDMA ) != 0u; |
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178 | |
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179 | if ( has_power ) { |
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180 | GPDMA_CONFIG = 0u; |
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181 | LPC176X_SCB.pconp &= ~LPC176X_SCB_PCONP_GPDMA; |
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182 | } |
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183 | |
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184 | /* else implies that the current module (gpdma) is turn off. Also, |
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185 | there is nothing to do. */ |
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186 | |
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187 | #endif |
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188 | } |
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189 | |
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190 | /** |
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191 | * @brief Stops the usb device. |
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192 | */ |
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193 | static BSP_START_TEXT_SECTION void lpc176x_stop_usb( void ) |
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194 | { |
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195 | #ifdef LPC176X_STOP_USB |
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196 | |
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197 | bool has_power = ( LPC176X_SCB.pconp & LPC176X_SCB_PCONP_USB ) != 0u; |
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198 | |
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199 | if ( has_power ) { |
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200 | OTG_CLK_CTRL = 0u; |
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201 | |
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202 | LPC176X_SCB.pconp &= ~LPC176X_SCB_PCONP_USB; |
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203 | LPC176X_SCB.usbclksel = 0u; |
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204 | } |
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205 | |
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206 | /* else implies that the current module (usb) is turn off. Also, |
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207 | there is nothing to do. */ |
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208 | #endif |
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209 | } |
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210 | |
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211 | BSP_START_TEXT_SECTION void bsp_start_hook_0( void ) |
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212 | { |
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213 | lpc176x_init_main_oscillator(); |
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214 | lpc176x_init_pll(); |
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215 | } |
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216 | |
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217 | BSP_START_TEXT_SECTION void bsp_start_hook_1( void ) |
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218 | { |
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219 | lpc176x_init_memory_map(); |
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220 | lpc176x_init_memory_accelerator(); |
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221 | lpc176x_stop_gpdma(); |
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222 | lpc176x_stop_usb(); |
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223 | bsp_start_copy_sections(); |
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224 | bsp_start_clear_bss(); |
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225 | |
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226 | /* At this point we can use objects outside the .start section */ |
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227 | } |
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