tdk-invn-oss / ultrasonic.soniclib Goto Github PK
View Code? Open in Web Editor NEWDriver repo for TDK InvenSense consumer ultrasonic sensors
Home Page: https://tdk-invn-oss.github.io/ultrasonic.soniclib
License: Other
Driver repo for TDK InvenSense consumer ultrasonic sensors
Home Page: https://tdk-invn-oss.github.io/ultrasonic.soniclib
License: Other
In ch_common.c
line ~792, we have:
if (pre_rx_cycles > REF_PRE_RX_CYCLES) { // if more than reference pre-rx cycle count
time_of_flight += (pre_rx_cycles - REF_PRE_RX_CYCLES); // apply adjustment for "late start"
}
With the value of REF_PRE_RX_CYCLES hard coded to 800. I think this abrupt transition can in some cases cause some confusing behavior. It would be good to apply offset calibration based on some empirical dataset. For example, we could interpolate from a table. Alternatively, we could develop a model, but the computation may be too expensive for many MCUs.
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