Sampling Loop

The cuplTag wakes up each minute. Several initialisation states are skipped. The minute counter is incremented. If this equals the configured sampling interval, then a sample is collected from the HDC2021.

cuplcodec updates the minute counter in the cupl URL (stored on the NFC EEPROM). If a new sample is available, this is encoded and added to the circular buffer.

@startuml hide empty description [*] --> init_state init_state #83f795 --> init_reqmemon: tr_ok init_reqmemon #83f795 --> init_waitmemon: tr_ok init_waitmemon #83f795 --> init_ntag: tr_ok init_waitmemon --> init_waitmemon: tr_wait init_ntag #83f795 --> init_wakeupcheck: tr_ok init_wakeupcheck #83f795 --> smpl_checkcounter: tr_samplingloop smpl_checkcounter #83f795 --> smpl_hdcreq: tr_hdcreq smpl_checkcounter --> smpl_wait: tr_updatemin smpl_hdcreq #83f795 --> smpl_hdcwait: tr_ok smpl_hdcwait #83f795 --> smpl_hdcread: tr_ok smpl_hdcwait --> smpl_hdcwait: tr_wait smpl_hdcread #83f795 --> smpl_wait: tr_ok smpl_hdcread --> [*]: tr_lowbat smpl_wait #83f795 --> [*]: tr_deepsleep @enduml

The state machine runs each minute in the sampling loop.