| 提交 | 用户 | age | ||
| bfc108 | 1 | /** |
| Q | 2 | ****************************************************************************** |
| 3 | * @file startup_stm32f042x6.s | |
| 4 | * @author MCD Application Team | |
| 5 | * @brief STM32F042x4/STM32F042x6 devices vector table for GCC toolchain. | |
| 6 | * This module performs: | |
| 7 | * - Set the initial SP | |
| 8 | * - Set the initial PC == Reset_Handler, | |
| 9 | * - Set the vector table entries with the exceptions ISR address | |
| 10 | * - Branches to main in the C library (which eventually | |
| 11 | * calls main()). | |
| 12 | * After Reset the Cortex-M0 processor is in Thread mode, | |
| 13 | * priority is Privileged, and the Stack is set to Main. | |
| 14 | ****************************************************************************** | |
| 15 | * | |
| 16 | * Redistribution and use in source and binary forms, with or without modification, | |
| 17 | * are permitted provided that the following conditions are met: | |
| 18 | * 1. Redistributions of source code must retain the above copyright notice, | |
| 19 | * this list of conditions and the following disclaimer. | |
| 20 | * 2. Redistributions in binary form must reproduce the above copyright notice, | |
| 21 | * this list of conditions and the following disclaimer in the documentation | |
| 22 | * and/or other materials provided with the distribution. | |
| 23 | * 3. Neither the name of STMicroelectronics nor the names of its contributors | |
| 24 | * may be used to endorse or promote products derived from this software | |
| 25 | * without specific prior written permission. | |
| 26 | * | |
| 27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 28 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 29 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 30 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | |
| 31 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 32 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
| 33 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | |
| 34 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |
| 35 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 36 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 37 | * | |
| 38 | ****************************************************************************** | |
| 39 | */ | |
| 40 | ||
| 41 | .syntax unified | |
| 42 | .cpu cortex-m0 | |
| 43 | .fpu softvfp | |
| 44 | .thumb | |
| 45 | ||
| 46 | .global g_pfnVectors | |
| 47 | .global Default_Handler | |
| 48 | ||
| 49 | /* start address for the initialization values of the .data section. | |
| 50 | defined in linker script */ | |
| 51 | .word _sidata | |
| 52 | /* start address for the .data section. defined in linker script */ | |
| 53 | .word _sdata | |
| 54 | /* end address for the .data section. defined in linker script */ | |
| 55 | .word _edata | |
| 56 | /* start address for the .bss section. defined in linker script */ | |
| 57 | .word _sbss | |
| 58 | /* end address for the .bss section. defined in linker script */ | |
| 59 | .word _ebss | |
| 60 | ||
| 61 | /** | |
| 62 | * @brief This is the code that gets called when the processor first | |
| 63 | * starts execution following a reset event. Only the absolutely | |
| 64 | * necessary set is performed, after which the application | |
| 65 | * supplied main() routine is called. | |
| 66 | * @param None | |
| 67 | * @retval : None | |
| 68 | */ | |
| 69 | ||
| 70 | .section .text.Reset_Handler | |
| 71 | .weak Reset_Handler | |
| 72 | .type Reset_Handler, %function | |
| 73 | Reset_Handler: | |
| 74 | ldr r0, =_estack | |
| 75 | mov sp, r0 /* set stack pointer */ | |
| 76 | ||
| 77 | /*Check if boot space corresponds to test memory*/ | |
| 78 | ||
| 79 | LDR R0,=0x00000004 | |
| 80 | LDR R1, [R0] | |
| 81 | LSRS R1, R1, #24 | |
| 82 | LDR R2,=0x1F | |
| 83 | CMP R1, R2 | |
| 84 | BNE ApplicationStart | |
| 85 | ||
| 86 | /*SYSCFG clock enable*/ | |
| 87 | ||
| 88 | LDR R0,=0x40021018 | |
| 89 | LDR R1,=0x00000001 | |
| 90 | STR R1, [R0] | |
| 91 | ||
| 92 | /*Set CFGR1 register with flash memory remap at address 0*/ | |
| 93 | LDR R0,=0x40010000 | |
| 94 | LDR R1,=0x00000000 | |
| 95 | STR R1, [R0] | |
| 96 | ||
| 97 | ApplicationStart: | |
| 98 | /* Copy the data segment initializers from flash to SRAM */ | |
| 99 | ldr r0, =_sdata | |
| 100 | ldr r1, =_edata | |
| 101 | ldr r2, =_sidata | |
| 102 | movs r3, #0 | |
| 103 | b LoopCopyDataInit | |
| 104 | ||
| 105 | CopyDataInit: | |
| 106 | ldr r4, [r2, r3] | |
| 107 | str r4, [r0, r3] | |
| 108 | adds r3, r3, #4 | |
| 109 | ||
| 110 | LoopCopyDataInit: | |
| 111 | adds r4, r0, r3 | |
| 112 | cmp r4, r1 | |
| 113 | bcc CopyDataInit | |
| 114 | ||
| 115 | /* Zero fill the bss segment. */ | |
| 116 | ldr r2, =_sbss | |
| 117 | ldr r4, =_ebss | |
| 118 | movs r3, #0 | |
| 119 | b LoopFillZerobss | |
| 120 | ||
| 121 | FillZerobss: | |
| 122 | str r3, [r2] | |
| 123 | adds r2, r2, #4 | |
| 124 | ||
| 125 | LoopFillZerobss: | |
| 126 | cmp r2, r4 | |
| 127 | bcc FillZerobss | |
| 128 | ||
| 129 | /* Call the clock system intitialization function.*/ | |
| 130 | bl SystemInit | |
| 131 | /* Call static constructors */ | |
| 132 | bl __libc_init_array | |
| 133 | /* Call the application's entry point.*/ | |
| 134 | bl main | |
| 135 | ||
| 136 | LoopForever: | |
| 137 | b LoopForever | |
| 138 | ||
| 139 | ||
| 140 | .size Reset_Handler, .-Reset_Handler | |
| 141 | ||
| 142 | /** | |
| 143 | * @brief This is the code that gets called when the processor receives an | |
| 144 | * unexpected interrupt. This simply enters an infinite loop, preserving | |
| 145 | * the system state for examination by a debugger. | |
| 146 | * | |
| 147 | * @param None | |
| 148 | * @retval : None | |
| 149 | */ | |
| 150 | .section .text.Default_Handler,"ax",%progbits | |
| 151 | Default_Handler: | |
| 152 | Infinite_Loop: | |
| 153 | b Infinite_Loop | |
| 154 | .size Default_Handler, .-Default_Handler | |
| 155 | /****************************************************************************** | |
| 156 | * | |
| 157 | * The minimal vector table for a Cortex M0. Note that the proper constructs | |
| 158 | * must be placed on this to ensure that it ends up at physical address | |
| 159 | * 0x0000.0000. | |
| 160 | * | |
| 161 | ******************************************************************************/ | |
| 162 | .section .isr_vector,"a",%progbits | |
| 163 | .type g_pfnVectors, %object | |
| 164 | .size g_pfnVectors, .-g_pfnVectors | |
| 165 | ||
| 166 | ||
| 167 | g_pfnVectors: | |
| 168 | .word _estack | |
| 169 | .word Reset_Handler | |
| 170 | .word NMI_Handler | |
| 171 | .word HardFault_Handler | |
| 172 | .word 0 | |
| 173 | .word 0 | |
| 174 | .word 0 | |
| 175 | .word 0 | |
| 176 | .word 0 | |
| 177 | .word 0 | |
| 178 | .word 0 | |
| 179 | .word SVC_Handler | |
| 180 | .word 0 | |
| 181 | .word 0 | |
| 182 | .word PendSV_Handler | |
| 183 | .word SysTick_Handler | |
| 184 | .word WWDG_IRQHandler /* Window WatchDog */ | |
| 185 | .word PVD_VDDIO2_IRQHandler /* PVD and VDDIO2 through EXTI Line detect */ | |
| 186 | .word RTC_IRQHandler /* RTC through the EXTI line */ | |
| 187 | .word FLASH_IRQHandler /* FLASH */ | |
| 188 | .word RCC_CRS_IRQHandler /* RCC and CRS */ | |
| 189 | .word EXTI0_1_IRQHandler /* EXTI Line 0 and 1 */ | |
| 190 | .word EXTI2_3_IRQHandler /* EXTI Line 2 and 3 */ | |
| 191 | .word EXTI4_15_IRQHandler /* EXTI Line 4 to 15 */ | |
| 192 | .word TSC_IRQHandler /* TSC */ | |
| 193 | .word DMA1_Channel1_IRQHandler /* DMA1 Channel 1 */ | |
| 194 | .word DMA1_Channel2_3_IRQHandler /* DMA1 Channel 2 and Channel 3 */ | |
| 195 | .word DMA1_Channel4_5_IRQHandler /* DMA1 Channel 4 and Channel 5 */ | |
| 196 | .word ADC1_IRQHandler /* ADC1 */ | |
| 197 | .word TIM1_BRK_UP_TRG_COM_IRQHandler /* TIM1 Break, Update, Trigger and Commutation */ | |
| 198 | .word TIM1_CC_IRQHandler /* TIM1 Capture Compare */ | |
| 199 | .word TIM2_IRQHandler /* TIM2 */ | |
| 200 | .word TIM3_IRQHandler /* TIM3 */ | |
| 201 | .word 0 /* Reserved */ | |
| 202 | .word 0 /* Reserved */ | |
| 203 | .word TIM14_IRQHandler /* TIM14 */ | |
| 204 | .word 0 /* Reserved */ | |
| 205 | .word TIM16_IRQHandler /* TIM16 */ | |
| 206 | .word TIM17_IRQHandler /* TIM17 */ | |
| 207 | .word I2C1_IRQHandler /* I2C1 */ | |
| 208 | .word 0 /* Reserved */ | |
| 209 | .word SPI1_IRQHandler /* SPI1 */ | |
| 210 | .word SPI2_IRQHandler /* SPI2 */ | |
| 211 | .word USART1_IRQHandler /* USART1 */ | |
| 212 | .word USART2_IRQHandler /* USART2 */ | |
| 213 | .word 0 /* Reserved */ | |
| 214 | .word CEC_CAN_IRQHandler /* CEC and CAN */ | |
| 215 | .word USB_IRQHandler /* USB */ | |
| 216 | ||
| 217 | /******************************************************************************* | |
| 218 | * | |
| 219 | * Provide weak aliases for each Exception handler to the Default_Handler. | |
| 220 | * As they are weak aliases, any function with the same name will override | |
| 221 | * this definition. | |
| 222 | * | |
| 223 | *******************************************************************************/ | |
| 224 | ||
| 225 | .weak NMI_Handler | |
| 226 | .thumb_set NMI_Handler,Default_Handler | |
| 227 | ||
| 228 | .weak HardFault_Handler | |
| 229 | .thumb_set HardFault_Handler,Default_Handler | |
| 230 | ||
| 231 | .weak SVC_Handler | |
| 232 | .thumb_set SVC_Handler,Default_Handler | |
| 233 | ||
| 234 | .weak PendSV_Handler | |
| 235 | .thumb_set PendSV_Handler,Default_Handler | |
| 236 | ||
| 237 | .weak SysTick_Handler | |
| 238 | .thumb_set SysTick_Handler,Default_Handler | |
| 239 | ||
| 240 | .weak WWDG_IRQHandler | |
| 241 | .thumb_set WWDG_IRQHandler,Default_Handler | |
| 242 | ||
| 243 | .weak PVD_VDDIO2_IRQHandler | |
| 244 | .thumb_set PVD_VDDIO2_IRQHandler,Default_Handler | |
| 245 | ||
| 246 | .weak RTC_IRQHandler | |
| 247 | .thumb_set RTC_IRQHandler,Default_Handler | |
| 248 | ||
| 249 | .weak FLASH_IRQHandler | |
| 250 | .thumb_set FLASH_IRQHandler,Default_Handler | |
| 251 | ||
| 252 | .weak RCC_CRS_IRQHandler | |
| 253 | .thumb_set RCC_CRS_IRQHandler,Default_Handler | |
| 254 | ||
| 255 | .weak EXTI0_1_IRQHandler | |
| 256 | .thumb_set EXTI0_1_IRQHandler,Default_Handler | |
| 257 | ||
| 258 | .weak EXTI2_3_IRQHandler | |
| 259 | .thumb_set EXTI2_3_IRQHandler,Default_Handler | |
| 260 | ||
| 261 | .weak EXTI4_15_IRQHandler | |
| 262 | .thumb_set EXTI4_15_IRQHandler,Default_Handler | |
| 263 | ||
| 264 | .weak TSC_IRQHandler | |
| 265 | .thumb_set TSC_IRQHandler,Default_Handler | |
| 266 | ||
| 267 | .weak DMA1_Channel1_IRQHandler | |
| 268 | .thumb_set DMA1_Channel1_IRQHandler,Default_Handler | |
| 269 | ||
| 270 | .weak DMA1_Channel2_3_IRQHandler | |
| 271 | .thumb_set DMA1_Channel2_3_IRQHandler,Default_Handler | |
| 272 | ||
| 273 | .weak DMA1_Channel4_5_IRQHandler | |
| 274 | .thumb_set DMA1_Channel4_5_IRQHandler,Default_Handler | |
| 275 | ||
| 276 | .weak ADC1_IRQHandler | |
| 277 | .thumb_set ADC1_IRQHandler,Default_Handler | |
| 278 | ||
| 279 | .weak TIM1_BRK_UP_TRG_COM_IRQHandler | |
| 280 | .thumb_set TIM1_BRK_UP_TRG_COM_IRQHandler,Default_Handler | |
| 281 | ||
| 282 | .weak TIM1_CC_IRQHandler | |
| 283 | .thumb_set TIM1_CC_IRQHandler,Default_Handler | |
| 284 | ||
| 285 | .weak TIM2_IRQHandler | |
| 286 | .thumb_set TIM2_IRQHandler,Default_Handler | |
| 287 | ||
| 288 | .weak TIM3_IRQHandler | |
| 289 | .thumb_set TIM3_IRQHandler,Default_Handler | |
| 290 | ||
| 291 | .weak TIM14_IRQHandler | |
| 292 | .thumb_set TIM14_IRQHandler,Default_Handler | |
| 293 | ||
| 294 | .weak TIM16_IRQHandler | |
| 295 | .thumb_set TIM16_IRQHandler,Default_Handler | |
| 296 | ||
| 297 | .weak TIM17_IRQHandler | |
| 298 | .thumb_set TIM17_IRQHandler,Default_Handler | |
| 299 | ||
| 300 | .weak I2C1_IRQHandler | |
| 301 | .thumb_set I2C1_IRQHandler,Default_Handler | |
| 302 | ||
| 303 | .weak SPI1_IRQHandler | |
| 304 | .thumb_set SPI1_IRQHandler,Default_Handler | |
| 305 | ||
| 306 | .weak SPI2_IRQHandler | |
| 307 | .thumb_set SPI2_IRQHandler,Default_Handler | |
| 308 | ||
| 309 | .weak USART1_IRQHandler | |
| 310 | .thumb_set USART1_IRQHandler,Default_Handler | |
| 311 | ||
| 312 | .weak USART2_IRQHandler | |
| 313 | .thumb_set USART2_IRQHandler,Default_Handler | |
| 314 | ||
| 315 | .weak CEC_CAN_IRQHandler | |
| 316 | .thumb_set CEC_CAN_IRQHandler,Default_Handler | |
| 317 | ||
| 318 | .weak USB_IRQHandler | |
| 319 | .thumb_set USB_IRQHandler,Default_Handler | |
| 320 | ||
| 321 | /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ | |
| 322 | ||
