This project forked from lycraft/stm32_iap
尝试一下IAP固件升级。两个工程（bootloader;app）。芯片使用的stm32l071rbt6，有128k的片上flash，分为3个区域:12k的bootloader,58k的app,58k的app升级区域。
学习一下IAP固件升级。芯片用的是STM32L071RBT6。所以片上资源带有128K的FLASH,还有6K的EEPROM，20K的SRAM。
用stm32cubemx创建了两个工程：Bootloader和app。
| Start Address | End Address | |
|---|---|---|
| Bootloader | 0x0800 0000 | 0x0800 2FFF |
| APP | 0x0800 3000 | 0x0800 FFFF |
| APP_OTA | 0x0801 0000 | 0x0801 FFFF |
按照以上的地址分配ROM空间。这样的话，Bootloader程序不能超过12K,APP程序不超过52K，APP_OTA不超过64K。
上图可以看到EEPROM的地址范围是：0x0808 0000 ~~0x0808 17FF
所以EEPROM一共是6K。现在的想法是，把升级的标志位放在EEPROM里边，boot程序读到升级的标志位，就把APP_OTA的内容写进APP的地址范围里。
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