按键检测，stm32，开发板教程，安富来开发板，裸机程序，c语言。(Key testing, stm32, development board tutorial, enjoy wealth to development board, bare-metal procedures, c language.)

用C语言编程对模拟量进行采集，单片机采用STM32，用SPI协议去读写AD7705，精度高，稳定性好，适合前端模拟量采集。(C language programming is used to collect analog data, MCU uses STM32, and SPI protocol is used to read and write AD7705. It has high precision, good stability, and is suitable for front-e

最小二乘法拟合多项式，效果非常好，与MATLAB的多项式拟合基本一样。亲自在STM32板子上跑过，几乎直接出来答案。用法简单，包含头文件然后直接调用即可，电脑或者开发板都可以直接跑。 注意！注意！注意！说三遍...拟合之后多项式的变量x其实是（X-a），a是输入数据点的均值。(The least square method fits the polynomial, and the effect is very good. .)