amiro-blt / Target / Source / ARMCM4_STM32 / cpu.c @ fc7151bb
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1 | 69661903 | Thomas Schöpping | /************************************************************************************//** |
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2 | * \file Source\ARMCM4_STM32\cpu.c
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3 | * \brief Bootloader cpu module source file.
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4 | * \ingroup Target_ARMCM4_STM32
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5 | * \internal
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6 | *----------------------------------------------------------------------------------------
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7 | * C O P Y R I G H T
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8 | *----------------------------------------------------------------------------------------
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9 | * Copyright (c) 2013 by Feaser http://www.feaser.com All rights reserved
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10 | *
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11 | *----------------------------------------------------------------------------------------
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12 | * L I C E N S E
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13 | *----------------------------------------------------------------------------------------
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14 | * This file is part of OpenBLT. OpenBLT is free software: you can redistribute it and/or
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15 | * modify it under the terms of the GNU General Public License as published by the Free
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16 | * Software Foundation, either version 3 of the License, or (at your option) any later
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17 | * version.
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18 | *
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19 | * OpenBLT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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20 | * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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21 | * PURPOSE. See the GNU General Public License for more details.
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22 | *
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23 | * You should have received a copy of the GNU General Public License along with OpenBLT.
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24 | * If not, see <http://www.gnu.org/licenses/>.
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25 | *
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26 | * A special exception to the GPL is included to allow you to distribute a combined work
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27 | * that includes OpenBLT without being obliged to provide the source code for any
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28 | * proprietary components. The exception text is included at the bottom of the license
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29 | * file <license.html>.
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30 | *
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31 | * \endinternal
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32 | ****************************************************************************************/
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33 | |||
34 | /****************************************************************************************
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35 | * Include files
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36 | ****************************************************************************************/
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37 | #include "boot.h" /* bootloader generic header */ |
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38 | |||
39 | |||
40 | /****************************************************************************************
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41 | * Macro definitions
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42 | ****************************************************************************************/
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43 | /** \brief Pointer to the user program's reset vector. */
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44 | #define CPU_USER_PROGRAM_STARTADDR_PTR ((blt_addr)(FlashGetUserProgBaseAddress() + 0x00000004)) |
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45 | /** \brief Pointer to the user program's vector table. */
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46 | #define CPU_USER_PROGRAM_VECTABLE_OFFSET ((blt_int32u)FlashGetUserProgBaseAddress())
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47 | |||
48 | |||
49 | /****************************************************************************************
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50 | * Register definitions
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51 | ****************************************************************************************/
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52 | /** \brief Vector table offset register. */
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53 | #define SCB_VTOR (*((volatile blt_int32u *) 0xE000ED08)) |
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54 | |||
55 | |||
56 | /****************************************************************************************
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57 | * Hook functions
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58 | ****************************************************************************************/
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59 | #if (BOOT_CPU_USER_PROGRAM_START_HOOK > 0) |
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60 | extern blt_bool CpuUserProgramStartHook(void); |
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61 | #endif
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62 | |||
63 | |||
64 | /****************************************************************************************
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65 | * External functions
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66 | ****************************************************************************************/
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67 | extern void reset_handler(void); /* implemented in cstart.s */ |
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68 | |||
69 | |||
70 | /************************************************************************************//** |
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71 | ** \brief Starts the user program, if one is present. In this case this function
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72 | ** does not return.
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73 | ** \return none.
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74 | **
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75 | ****************************************************************************************/
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76 | void CpuStartUserProgram(void) |
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77 | { |
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78 | void (*pProgResetHandler)(void); |
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79 | blt_addr msp; |
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80 | |||
81 | /* check if a user program is present by verifying the checksum */
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82 | if (NvmVerifyChecksum() == BLT_FALSE)
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83 | { |
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84 | /* not a valid user program so it cannot be started */
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85 | return;
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86 | } |
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87 | #if (BOOT_CPU_USER_PROGRAM_START_HOOK > 0) |
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88 | /* invoke callback */
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89 | if (CpuUserProgramStartHook() == BLT_FALSE)
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90 | { |
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91 | /* callback requests the user program to not be started */
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92 | return;
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93 | } |
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94 | #endif
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95 | #if (BOOT_COM_ENABLE > 0) |
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96 | /* release the communication interface */
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97 | ComFree(); |
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98 | #endif
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99 | /* reset the timer */
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100 | TimerReset(); |
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101 | /* remap user program's vector table */
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102 | SCB_VTOR = CPU_USER_PROGRAM_VECTABLE_OFFSET & (blt_int32u)0x1FFFFF80;
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103 | |||
104 | /* set the mainstack to vector table for user program start.
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105 | */
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106 | msp = *((blt_addr*)CPU_USER_PROGRAM_VECTABLE_OFFSET); |
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107 | asm volatile ("MSR MSP, %0" : : "r" (msp) ); |
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108 | |||
109 | /* set the address where the bootloader needs to jump to. this is the address of
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110 | * the 2nd entry in the user program's vector table. this address points to the
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111 | * user program's reset handler.
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112 | */
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113 | pProgResetHandler = (void(*)(void))(*((blt_addr*)CPU_USER_PROGRAM_STARTADDR_PTR)); |
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114 | /* start the user program by activating its reset interrupt service routine */
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115 | pProgResetHandler(); |
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116 | } /*** end of CpuStartUserProgram ***/
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117 | |||
118 | |||
119 | /************************************************************************************//** |
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120 | ** \brief Copies data from the source to the destination address.
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121 | ** \param dest Destination address for the data.
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122 | ** \param src Source address of the data.
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123 | ** \param len length of the data in bytes.
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124 | ** \return none.
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125 | **
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126 | ****************************************************************************************/
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127 | void CpuMemCopy(blt_addr dest, blt_addr src, blt_int16u len)
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128 | { |
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129 | blt_int8u *from, *to; |
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130 | |||
131 | /* set casted pointers */
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132 | from = (blt_int8u *)src; |
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133 | to = (blt_int8u *)dest; |
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134 | |||
135 | /* copy all bytes from source address to destination address */
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136 | while(len-- > 0) |
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137 | { |
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138 | /* store byte value from source to destination */
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139 | *to++ = *from++; |
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140 | /* keep the watchdog happy */
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141 | CopService(); |
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142 | } |
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143 | } /*** end of CpuMemCopy ***/
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144 | |||
145 | |||
146 | /************************************************************************************//** |
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147 | ** \brief Perform a soft reset of the microcontroller by starting from the reset ISR.
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148 | ** \return none.
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149 | **
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150 | ****************************************************************************************/
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151 | void CpuReset(void) |
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152 | { |
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153 | /* perform a software reset by calling the reset ISR routine */
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154 | reset_handler(); |
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155 | } /*** end of CpuReset ***/
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156 | |||
157 | |||
158 | /*********************************** end of cpu.c **************************************/
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