在freertos框架下，计量的应用成开发，不涉及到具体的计量芯片，计量功能分层设计，这里设计到的是计量的应用层，底层的计量芯片，因人而异。(In the FreeRTOS framework, metering applications into development, does not involve specific measurement chip, measurement function layered design, here is designed to measure the