[19260fb] | 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.com/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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