![\"image-20220908170803535.png\"](\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\")
<\/div><\/p>\n<\/blockquote>\n
\u81f3\u6b64\uff0c\u542f\u52a8\u6587\u4ef6\u6211\u4eec\u5c31\u5206\u6790\u5b8c\u4e86\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u6765\u770b\u770b\u6574\u4e2a\u542f\u52a8\u8fc7\u7a0b\u3002<\/p>\n
\u542f\u52a8\u8fc7\u7a0b\u5206\u6790<\/h2>\n
\u4e00\u5207\u7684\u8d77\u6e90\u662f\u590d\u4f4d\u7a0b\u5e8f\u5165\u53e3\uff0c\u5982\u679c\u6211\u4eec\u662f\u81ea\u884c\u4f7f\u7528\u7f16\u8bd1\u5668\u7f16\u8bd1\u7136\u540e\u4f7f\u7528\u94fe\u63a5\u5668\u8fdb\u884c\u94fe\u63a5\u7684\u8bdd\u6211\u4eec\u53ef\u4ee5\u81ea\u884c\u6307\u5b9a\u590d\u4f4d\u7a0b\u5e8f\u7684\u5165\u53e3\u5730\u5740\u3002\u4e0d\u8fc7\u5728Keil\u7684\u73af\u5883\u4e2d\uff0c\u7edd\u5927\u90e8\u5206\u7684\u5e94\u7528\u90fd\u662f\u4ece\u590d\u4f4d\u5411\u91cf\uff08\u5373Reset_Handler<\/strong>\uff09\u5f00\u59cb\u7684\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u5c31\u4ece\u8fd9\u91cc\u5f00\u59cb\u987a\u85e4\u6478\u74dc\u3002<\/p>\n\u53c8\u662f\u90a3\u6bb5\u719f\u6089\u7684\u4ee3\u7801\uff1a<\/p>\n
Reset_Handler PROC\n EXPORT Reset_Handler [WEAK]\n IMPORT SystemInit\n IMPORT __main\n\n LDR R0, =SystemInit\n BLX R0\n LDR R0, =__main\n BX R0\n ENDP<\/code><\/pre>\n\u4e4b\u524d\u9057\u7559\u7684SystemInit<\/code>\u548c__main<\/code>\u4e24\u4e2a\u51fd\u6570\u7684\u529f\u80fd\u8ba9\u6211\u4eec\u6765\u9010\u4e2a\u5eb7\u5eb7\uff1a<\/p>\n\/**\n * @brief Setup the microcontroller system\n * Initialize the FPU setting, vector table location and External memory\n * configuration.\n * @param None\n * @retval None\n *\/\nvoid SystemInit(void)\n{\n\/* FPU settings ------------------------------------------------------------*\/\n#if (__FPU_PRESENT == 1) && (__FPU_USED == 1)\n SCB->CPACR |= ((3UL << 10 * 2) | (3UL << 11 * 2)); \/* set CP10 and CP11 Full Access *\/\n#endif\n\n#if defined(DATA_IN_ExtSRAM) || defined(DATA_IN_ExtSDRAM)\n SystemInit_ExtMemCtl();\n#endif \/* DATA_IN_ExtSRAM || DATA_IN_ExtSDRAM *\/\n\n \/* Configure the Vector Table location -------------------------------------*\/\n#if defined(USER_VECT_TAB_ADDRESS)\n SCB->VTOR = VECT_TAB_BASE_ADDRESS | VECT_TAB_OFFSET; \/* Vector Table Relocation in Internal SRAM *\/\n#endif \/* USER_VECT_TAB_ADDRESS *\/\n}<\/code><\/pre>\n\u663e\u7136\uff0cSystemInit<\/code>\u7684\u4f5c\u7528\u662f\u521d\u59cb\u5316\u7cfb\u7edf\uff08\u5e9f\u8bdd\uff09\u3002<\/p>\n\u7b2c\u4e00\u90e8\u5206\u6761\u4ef6\u7f16\u8bd1\u529f\u80fd\u662f\u542f\u7528\u6d6e\u70b9\u8fd0\u7b97\u652f\u6301\u3002<\/p>\n
\u7b2c\u4e8c\u90e8\u5206\u5982\u679c\u4f7f\u7528\u5916\u90e8SRAM\u4f5c\u4e3a\u5185\u5b58\u7a7a\u95f4\uff0c\u5c31\u4f1a\u8c03\u7528SystemInit_ExtMemCtl<\/code>\u6765\u914d\u7f6e\u5916\u90e8\u7684SRAM\u6240\u4f7f\u7528\u5230\u7684GPIO\uff0c\u540c\u65f6\u63a5\u4e0b\u6765\u7684\u5806\u6808\u5206\u914d\u90fd\u4f1a\u5728\u5916\u90e8SRAM \u4e0a\u8fdb\u884c\u3002<\/p>\n\u7b2c\u4e09\u90e8\u5206\u5982\u679c\u7528\u6237\u5b9a\u4e49\u4e86\u81ea\u5df1\u7684\u5411\u91cf\u8868\uff0c\u5c31\u4f1a\u5c06\u7528\u6237\u81ea\u5df1\u7684\u5411\u91cf\u8868\u5730\u5740\u5199\u5165\u5bf9\u5e94\u5bc4\u5b58\u5668\u3002<\/p>\n
\u603b\u7684\u6765\u8bf4\uff0c\u8be5\u51fd\u6570\u5c31\u662f\u5bf9\u6d6e\u70b9\u529f\u80fd\u3001\u5185\u5b58\u4f7f\u7528\u4ee5\u53ca\u5411\u91cf\u8868\u76f8\u5173\u7684\u5185\u5bb9\u8fdb\u884c\u4e86\u521d\u59cb\u5316\u3002<\/p>\n
\u63a5\u4e0b\u6765\u6211\u4eec\u5eb7\u5eb7__main<\/code>\u51fd\u6570\uff0c\u7531\u4e8e\u8be5\u51fd\u6570\u4f3c\u4e4e\u662f\u7f16\u8bd1\u5668\u5185\u90e8\u94fe\u63a5\u5e93\u4e2d\u7684\u5185\u5bb9\uff0c\u6240\u4ee5\u7b14\u8005\u53ea\u597d\u5728\u53cd\u6c47\u7f16\u6587\u4ef6\u4e2d\u4e00\u7aa5\u7a76\u7adf\u4e86\u3002\u5728\u4f7f\u7528MicroLib\u7684\u60c5\u51b5\u4e0b\uff0c\u8be5\u51fd\u6570\u7684\u53cd\u6c47\u7f16\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n __main\n _main_stk\n 0x08000194: f8dfd00c .... LDR sp,__lit__00000000 ; [0x80001a4] = 0x20000678\n .ARM.Collect$$$$00000004\n _main_scatterload\n 0x08000198: f000f890 .... BL __scatterload ; 0x80002bc\n .ARM.Collect$$$$00000008\n .ARM.Collect$$$$0000000A\n .ARM.Collect$$$$0000000B\n __main_after_scatterload\n _main_clock\n _main_cpp_init\n _main_init\n 0x0800019c: 4800 .H LDR r0,[pc,#0] ; [0x80001a0] = 0x8001259\n 0x0800019e: 4700 .G BX r0<\/code><\/pre>\n\u663e\u7136\uff0c\u6b64\u5904\u6211\u4eec\u7684\u5de5\u4f5c\u91cf\u5927\u7ffb\u500d\uff0c\u56e0\u4e3a\u5176\u4e2d\u8c03\u7528\u4e86__scatterload<\/code>\u51fd\u6570\uff08\u88ab\u8feb\u52a0\u73ed<\/del><\/p>\n<\/div><\/p>\n
__scatterload\n__scatterload_rt2\n__scatterload_rt2_thumb_only\n 0x0800019c: a00a .. ADR r0,{pc}+0x2c ; 0x80001c8\n 0x0800019e: e8900c00 .... LDM r0,{r10,r11}\n 0x080001a2: 4482 .D ADD r10,r10,r0\n 0x080001a4: 4483 .D ADD r11,r11,r0\n 0x080001a6: f1aa0701 .... SUB r7,r10,#1<\/code><\/pre>\n__scatterload<\/code>\u51fd\u6570\u8c03\u8bd5\u8d77\u6765\u6bd4\u8f83\u56f0\u96be\uff0c\u9700\u8981\u5bf9\u7167\u7740\u53cd\u6c47\u7f16\u4e00\u70b9\u4e00\u70b9\u5730\u770b\uff0c\u4f46\u662f\u5176\u529f\u80fd\u6982\u62ec\u8d77\u6765\u8fd8\u662f\u76f8\u5bf9\u6765\u8bf4\u7b80\u5355\u7684\uff1a<\/p>\n\u9996\u5148\u5185\u90e8\u8c03\u7528__scatterload_copy<\/code>\u51fd\u6570\uff0c\u4f9d\u7167Region$$Table<\/code>\u6bb5\u5185\u7684\u5730\u5740\u5c06\u9700\u8981\u7684\u6570\u636e\u4eceFLASH\u62f7\u8d1d\u5230\u5185\u5b58\u4e2d:<\/p>\n __scatterload_copy\n 0x080013c8: e002 .. B 0x80013d0 ; __scatterload_copy + 8\n 0x080013ca: c808 .. LDM r0!,{r3}\n 0x080013cc: 1f12 .. SUBS r2,r2,#4\n 0x080013ce: c108 .. STM r1!,{r3}\n 0x080013d0: 2a00 .* CMP r2,#0\n 0x080013d2: d1fa .. BNE 0x80013ca ; __scatterload_copy + 2\n 0x080013d4: 4770 pG BX lr<\/code><\/pre>\n\u63a5\u7740\u8c03\u7528__scatterload_zeroinit<\/code>\u51fd\u6570\u5bf9ZI\u6bb5\u8fdb\u884c\u521d\u59cb\u5316:<\/p>\n __scatterload_zeroinit\n 0x080013d8: 2000 . MOVS r0,#0\n 0x080013da: e001 .. B 0x80013e0 ; __scatterload_zeroinit + 8\n 0x080013dc: c101 .. STM r1!,{r0}\n 0x080013de: 1f12 .. SUBS r2,r2,#4\n 0x080013e0: 2a00 .* CMP r2,#0\n 0x080013e2: d1fb .. BNE 0x80013dc ; __scatterload_zeroinit + 4\n 0x080013e4: 4770 pG BX lr\n 0x080013e6: 0000 .. MOVS r0,r0<\/code><\/pre>\n\u6700\u540e\u8c03\u7528__main_after_scatterload<\/code>\u51fd\u6570\u8df3\u8f6c\u5230main\u51fd\u6570:<\/p>\n __main_after_scatterload\n _main_clock\n _main_cpp_init\n _main_init\n 0x0800019c: 4800 .H LDR r0,[pc,#0] ; [0x80001a0] = 0x8001259\n 0x0800019e: 4700 .G BX r0<\/code><\/pre>\n\u6b64\u5904\u503c\u5f97\u6ce8\u610f\u7684\u4e00\u70b9\u662f\uff1a\u7531\u4e8e\u8df3\u8f6c\u5230main\u51fd\u6570\u4f7f\u7528\u7684\u662fBX\u6307\u4ee4\uff0c\u5e76\u6ca1\u6709\u4fdd\u5b58\u8fd4\u56de\u5730\u5740\u5230LR\u5bc4\u5b58\u5668\uff0c\u6545\u4f7f\u7528\u5fae\u5e93\u65f6\u4e3b\u51fd\u6570\u4e0d\u80fd\u8fd4\u56de<\/strong>\u8fd9\u4ef6\u4e8b\u5c31\u5f88\u5bb9\u6613\u7406\u89e3\u4e86\u3002<\/p>\n\u5176\u5b9e\u539f\u672c\u5e94\u8be5\u5199\u5230\u8fd9\u91cc\u5c31\u7ed3\u675f\u7684\uff0c\u4f46\u662f\u51fa\u4e8e\u7b14\u8005\u7684\u5f3a\u8feb\u75c7\uff0c\u65e2\u7136\u5df2\u7ecf\u5206\u6790\u4e86\u4f7f\u7528\u5fae\u5e93\u7684\u60c5\u51b5\uff0c\u81ea\u7136\u4e5f\u8981\u5206\u6790\u4e00\u4e0b\u4e0d\u4f7f\u7528\u5fae\u5e93\u7684\u60c5\u51b5\u3002\uff08\u6bd5\u7adf\u5fae\u5e93\u7a76\u7adf\u548c\u6b63\u5e38C\u5e93\u6709\u4ec0\u4e48\u533a\u522b\u4e5f\u662f\u7b14\u8005\u611f\u5174\u8da3\u7684\u5185\u5bb9\u4e4b\u4e00<\/del><\/p>\n\u5173\u95ed\u5fae\u5e93\u7684\u5f00\u5173\uff0c\u53ef\u4ee5\u770b\u5230\u6b64\u65f6\u7f16\u8bd1\u51fa\u7684__main<\/code>\u51fd\u6570\u975e\u5e38\u77ed\u5c0f\u7cbe\u608d\uff1a<\/p>\n __main\n 0x08000194: f000f802 .... BL __scatterload ; 0x800019c\n 0x08000198: f000f84e ..N. BL __rt_entry ; 0x8000238<\/code><\/pre>\n\u4f46\u662f\u7b14\u8005\u55c5\u5230\u4e86\u52a0\u73ed\u7684\u5473\u9053\uff0c\u6240\u4ee5\u4eca\u5929\u5c31\u5148\u6e9c\u4e86\u3002<\/del><\/p>\n<\/div><\/p>\n
\u65f6\u95f4\u6765\u5230\u4e86\u7b2c\u4e8c\u5929\uff0c\u7b14\u8005\u5f00\u59cb\u4e0a\u73ed\u4e86\u3002<\/del><\/p>\n__scatterload<\/code>\u51fd\u6570\u5185\u5bb9\u5176\u5b9e\u548c\u4f7f\u7528\u5fae\u5e93\u7684\u65f6\u5019\u662f\u4e00\u6837\u7684\uff1a<\/p>\n __scatterload\n __scatterload_rt2\n __scatterload_rt2_thumb_only\n 0x0800019c: a00a .. ADR r0,{pc}+0x2c ; 0x80001c8\n 0x0800019e: e8900c00 .... LDM r0,{r10,r11}\n 0x080001a2: 4482 .D ADD r10,r10,r0\n 0x080001a4: 4483 .D ADD r11,r11,r0\n 0x080001a6: f1aa0701 .... SUB r7,r10,#1<\/code><\/pre>\n\u6574\u4f53\u4e0a\u7684\u884c\u4e3a\u4e5f\u662f\u5927\u81f4\u76f8\u540c\u7684\uff1a<\/p>\n
\u9996\u5148\u8c03\u7528__scatterload_copy<\/code>\u51fd\u6570\u6765\u62f7\u8d1d\u6570\u636e\uff1b<\/p>\n\u63a5\u7740\u8c03\u7528__scatterload_zeroinit<\/code>\u51fd\u6570\u521d\u59cb\u5316ZI\u6bb5\uff1b<\/p>\n\u4e0d\u8fc7\u4e0d\u540c\u7684\u662f\uff0c\u6b64\u5904\u7531\u4e8e\u4f7f\u7528\u4e86ARM\u7684C\u5e93\uff0c\u6240\u4ee5\u540e\u7eed\u8c03\u7528\u4e86__rt_entry<\/code>\u51fd\u6570\u6765\u8fdb\u5165\u4e3b\u51fd\u6570\uff0c\u800c\u4e0d\u662f\u5728__scatterload<\/code>\u5904\u76f4\u63a5\u8fdb\u5165\u4e3b\u51fd\u6570\u3002<\/p>\n\u81f3\u4e8e__rt_entry<\/code>\u51fd\u6570\uff0c\u7b14\u8005\u672c\u6253\u7b97\u8c03\u8bd5\u8fdb\u53bb\u770b\u770b\u505a\u4e86\u4ec0\u4e48\u7684\uff0c\u4f46\u662f\u7a81\u7136\u7075\u5149\u4e00\u95ea\uff0c\u60f3\u5230\u4e86\u6709\u8fd9\u4e48\u4e00\u4e2a\u6587\u6863\uff1a<\/p>\nArm C and C++ Libraries and Floating-Point Support User Guide<\/strong><\/p>\n\u5728\u5176\u4e2d\u8be6\u7ec6\u7684\u4ecb\u7ecd\u4e86__rt_entry<\/code>\u7684\u4f5c\u7528\uff1a<\/p>\n<\/div><\/p>\n
\u5373\uff1a\u8bbe\u7f6e\u5806\u6808\u3001\u521d\u59cb\u5316C\u5e93\u3001\u8c03\u7528main\uff0c\u4ee5\u53ca\u5728\u4e3b\u51fd\u6570\u8fd4\u56de\u540e\u505a\u4e00\u4e9b\u6536\u5c3e\u5de5\u4f5c\uff0c\u5982\uff1a\u505c\u6b62C\u5e93\u548c\u9000\u51fa\u7a0b\u5e8f\u3002<\/p>\n
\u81f3\u6b64\uff0c\u6574\u4e2a\u542f\u52a8\u8fc7\u7a0b\u5c31\u5168\u90e8\u5206\u6790\u5b8c\u6bd5\u4e86\u3002<\/p>\n
\u4e0b\u73ed\uff01<\/del><\/p>\n","protected":false},"excerpt":{"rendered":"\u524d\u8a00 \u7b14\u8005\u5047\u671f\u521a\u5f00\u5b66\u6ca1\u51e0\u5929\uff0c\u73b0\u5728\u5904\u4e8e\u4e00\u4e2a\u6bd4\u8f83\u95f2\u7684\u72b6\u6001\u3002 \u5047\u671f\u7b80\u5355\u5b66\u4e60\u4e86\u4e00\u4e0bARM\u6c47\u7f16\u76f8\u5173\u5185\u5bb9\uff0c\u76ee\u7684\u662f\u5199\u4e00\u4e2a\u7b80\u5355 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,4],"tags":[18,48],"class_list":["post-224","post","type-post","status-publish","format-standard","hentry","category-embedded","category-words","tag-stm32","tag-48"],"_links":{"self":[{"href":"https:\/\/zhewana.cn\/index.php?rest_route=\/wp\/v2\/posts\/224","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zhewana.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zhewana.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zhewana.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zhewana.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=224"}],"version-history":[{"count":3,"href":"https:\/\/zhewana.cn\/index.php?rest_route=\/wp\/v2\/posts\/224\/revisions"}],"predecessor-version":[{"id":441,"href":"https:\/\/zhewana.cn\/index.php?rest_route=\/wp\/v2\/posts\/224\/revisions\/441"}],"wp:attachment":[{"href":"https:\/\/zhewana.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=224"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zhewana.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=224"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zhewana.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=224"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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<\/div><\/p>\n![\"image-20220908170803535.png\"](\"https:\/\/zhewana.cn\/wp-content\/uploads\/2022\/09\/1703849778.png\")
<\/div><\/p>\n<\/blockquote>\n![\"v2-949533724348dae5570f07caafc2f753_720w.jpg\"](\"https:\/\/zhewana.cn\/wp-content\/uploads\/2022\/09\/2529672129.jpg\")
<\/div><\/p>\n![\"v2-0d9b54bb3f8881844e2c64898eb8c483_720w.jpg\"](\"https:\/\/zhewana.cn\/wp-content\/uploads\/2022\/09\/1938986935.jpg\")
<\/div><\/p>\n![\"image-20220908162121552.png\"](\"https:\/\/zhewana.cn\/wp-content\/uploads\/2022\/09\/3472986312.png\")
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