ST供应商提供的stm32l15x系列的touchkey源码，该源码我自己已经用过，有很强的环境自校准功能，在这款低价位芯片上发挥的很好，不过是三个定时器pwm捕获实现的，这样很耗cpu资源。-ST suppliers stm32l15x series touchkey source, the source I' ve used, there is a strong environmental self-calibration feature on this low-cost chips

基于stm32的四轴飞行器源码，使用mpu6050模块,四通PWM捕获，PID,姿态解算-Four axis based on stm32 aircraft source, the use of mpu6050 module, four-way PWM capture, PID, the attitude algorithm

实现STM32f103c8t6的输入捕获功能(Implement the input capture function of STM32f103c8t6)