[{"createTime":1735734952000,"id":1,"img":"hwy_ms_500_252.jpeg","link":"https://activity.huaweicloud.com/cps.html?fromacct=261f35b6-af54-4511-a2ca-910fa15905d1&utm_source=V1g3MDY4NTY=&utm_medium=cps&utm_campaign=201905","name":"华为云秒杀","status":9,"txt":"华为云38元秒杀","type":1,"updateTime":1735747411000,"userId":3},{"createTime":1736173885000,"id":2,"img":"txy_480_300.png","link":"https://cloud.tencent.com/act/cps/redirect?redirect=1077&cps_key=edb15096bfff75effaaa8c8bb66138bd&from=console","name":"腾讯云秒杀","status":9,"txt":"腾讯云限量秒杀","type":1,"updateTime":1736173885000,"userId":3},{"createTime":1736177492000,"id":3,"img":"aly_251_140.png","link":"https://www.aliyun.com/minisite/goods?userCode=pwp8kmv3","memo":"","name":"阿里云","status":9,"txt":"阿里云2折起","type":1,"updateTime":1736177492000,"userId":3},{"createTime":1735660800000,"id":4,"img":"vultr_560_300.png","link":"https://www.vultr.com/?ref=9603742-8H","name":"Vultr","status":9,"txt":"Vultr送$100","type":1,"updateTime":1735660800000,"userId":3},{"createTime":1735660800000,"id":5,"img":"jdy_663_320.jpg","link":"https://3.cn/2ay1-e5t","name":"京东云","status":9,"txt":"京东云特惠专区","type":1,"updateTime":1735660800000,"userId":3},{"createTime":1735660800000,"id":6,"img":"new_ads.png","link":"https://www.iodraw.com/ads","name":"发布广告","status":9,"txt":"发布广告","type":1,"updateTime":1735660800000,"userId":3},{"createTime":1735660800000,"id":7,"img":"yun_910_50.png","link":"https://activity.huaweicloud.com/discount_area_v5/index.html?fromacct=261f35b6-af54-4511-a2ca-910fa15905d1&utm_source=aXhpYW95YW5nOA===&utm_medium=cps&utm_campaign=201905","name":"底部","status":9,"txt":"高性能云服务器2折起","type":2,"updateTime":1735660800000,"userId":3}]
This paper introduces in detail STM32 The process of single chip microcomputer starting , Power on from Reset_Handle Jump to main() Process of function . among , Will focus on explanation __main Assembly code for
<>STM32 Start process
<>1. from Reset_Handler Start
Reset_Handler The code of is as follows , reference resources 《startup_stm32f10x_hd.s》
1- calculation SystemInit Function entry address , And put the address load reach R0;
R0 = [PC + 24] = [0x08000144 + 24 +4] = [0x08000160] = 0x08000495
2 – implement r0 Function pointed to , as well as SystemInit(); meanwhile , The address of the next instruction （ as well as PC+4） Save to lr(r14) in
3 – calculation __main Entry address of , and load reach r0
4 – implement __main()
<>__main Implementation process of
* __main Function content
* SP（R13） assignment
SP = [pc +12 +4] = [0x08000130 + 12 + 4] = [0x08000140] = 0x20000408
* implement __scatterload() ( address 0x08000168), and load R14, lr = 0x08000139
<>__scatterload Function execution process
<>__scatterload_copy Execution process
<>__scatterload_zeroinit Execution process
<>__main_after_scatterload Execution process