diff options
| -rw-r--r-- | README.md | 48 |
1 files changed, 35 insertions, 13 deletions
@@ -1,20 +1,42 @@ # msp430-etv – MSP430 EnergyTrace Visualizer -msp430-etv is a wrapper around -[energytrace-util](https://github.com/derf/energytrace-util) to -simplify aggregation, visualization and basic analysis of EnergyTrace -measurements. +msp430-etv performs, visualizes and analyzes energy measurements performed +on TI MSP430 Launchpads using the on-board EnergyTrace circuit. -Measumerents can be taken directly or loaded from energytrace-util output. -Data belonging to startup code whose power consumption is not of interest can -be skipped. +It uses [energytrace-util](https://github.com/derf/energytrace-util) to start +and stop measurements using the proprietary TI MSP430 library. Measurements can +be analyzed directly or saved to a file for later analysis as well as +processing by other tools. -msp430-etv supports plotting the power consumption (calculated from voltage and -current data) and writing mean voltage, current, and power as well as total -energy for a given measurement to stdout. +Analysis options include + +* plots showing voltage, current, or power over time, +* data partitioning and statistics using a power threshold, and +* changepoint detectiong using the PELT algorithm. + +See `bin/msp430-etv --help` for usage details. See [Automatic Energy Model +Generation with MSP430 +EnergyTrace](https://ess.cs.uos.de/static/papers/Friesel-2021-CPSIoTBench.pdf) +for accuracy figures and some odds and ends. + +## File Format + +EnergyTrace performs measurements in intervals of about 270 µs. Each line +contains data for one measurement interval. Measurement data consists of for +readings: + +* Timestamps (µs) since start of the measurement, +* Mean current (nA) over the last ten to thousand intervals, +* Mean voltage (mV) with details unknown, and +* Cumulative energy (nJ) since start of the measurement. + +Note that the EnergyTrace hardware and firmware only measures time, voltage, +and energy. Current readings are calculated by the MSP430 client library. Power +readings are calculated from timestamps and energy readings by msp430-etv. ## Dependencies -* [energytrace-util](https://github.com/derf/energytrace-util) - and libmsp430.so -* Python 3 with matplotlib and numpy +* Python 3, numpy +* Taking measurements: [energytrace-util](https://github.com/derf/energytrace-util) and libmsp430.so +* Plots: python3-matplotlib +* Changepoint detection: python3-ruptures |