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 application layer, the underlying metering chip varies from person to person.)