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 to play well, but to achieve the three timer pwm capture , and this is very cpu intensive.