USB power measurement
|USB power measurement set-up
It is generally good to know what is consumed power all the time during USB driver development, especially because power is drained from the very limited capacity USB bus. Reliable testing of power management features without a measurement equipment is also quite impossible.
Sometimes it is nice to compare Linux driver and Windows driver from the power consumption point of view. It is good indicator that something could be wrong if your driver is eating more power on Linux than on Windows in similar use case. Undesirable power usage is always kinda problem, especially when device is running on battery. The other problem is heating. USB devices and chips are small and there is no heat-sinks used. Over heating could cause stability problems or even break your device in worst case.
|old USB power measurement set-up
|testing wiring before cover install