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需要开发板，可以加一下我吗？240077876@qq.com
加速度，四元数，欧拉角这些我都知道怎么得到，只是 我所说的“提起” “放下” 是一个动态的过程，有加速度变化的过程，我想知道的是如何识别这个过程，相关算法和思路
这是一个检测电梯上下运行的博客，也许可以借鉴下
https://zhoujianshi.github.io/articles/ … index.html
uboot: go 0xffff0020
Through serial console
If you have access to the UART already, you can send the character '1' ('2' on some devices) to the device during power-up.Boot1 is initialized using this method.
With later SoCs, Allwinner's U-boot supports the "efex" command.
If "efex" is not available in your U-boot, you can use the simple uboot "go" command with arguments pointing to the return FEL address:
http://linux-sunxi.org/BROM#Other_booting_methods
=> go 0xffff0020
Starting application at 0xFFFF0020 ...
v3s可以这么做吗？
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