请教基于bootloader的远程升级程序的几点问题

[旭余朱]

项目背景：使用KE系列MCU实现远程升级功能，要求支持断点续传。

1、官网给的KE系列的bootloader例子的bootloader代码在MCU上电后工作在其它程序前的。那远程升级时需要让单片机掉电再重新上电吗。bootloader能不能随时监听，收到远程升级报文后再开启bootloader功能，等待更新？

2、bootloader的机制是怎样的，是传完后判断数据无误后再开始升级程序还是边接收边升级，如果是后者这样的机制，远程升级时受到各方面影响导致数据中断、误码、丢包，那MCU是否就死机了？

3、KE系列的官方例程是基于KE02的，移植到KE04需要什么操作呢？

恳请指导！

[nxf56274]

Hi,

1、因为flash被分成bootloader和app，bootloader是从地址0开始。所以只要想办法让mcu从头开始执行就行。可以考虑让mcu软件复位，就不必重启。远程端可以和MCU建立一个标志，远程端发送标志，MCU接收到标志出就软件复位，执行bootloader。

2、边收边升级。接收完代码，可以让远程端发送校验码，mcu自己也进行校验比对校验码。如果出错就不执行app，继续运行bootloader，只有校验码通过才执行app，这样就不会死机

3、注意修改linker文件，包括flash大小，sram地址等。

Have a great day,
TIC

-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
-------------------------------------------------------------------------------

[旭余朱]

感谢回复，另外请教下，断点续传这个功能要如何实现？

[nxf56274]

Hi,

MCU的flash擦写必须是一个扇区，那么你的数据必须等分为n个扇区。远程端和MCU都计数传输了几个扇区，如果中断了，那么双方通信传输到第几个扇区。比如第5个扇区没有传输完成，那么MCU首先把5扇区擦除，再重写。

Have a great day,
TIC

-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
-------------------------------------------------------------------------------

[旭余朱]

感谢回复，最后再请教个问题：512K的代码量，全部传输过来并且校验完毕后，开始重写FLASH，重写FLASH的这个时间大概是多少？

[nxf56274]

Hi,

芯片的datasheet有Flash characteristics，你可以参考

Have a great day,
TIC

-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
-------------------------------------------------------------------------------