Manson HCS-3xxx series programmable power supply support

We're happy to announce that libsigrok now supports the Manson HCS-3xxx series of programmable power supplies (PPS).

Thanks a lot to Matthias Heidbrink for improving the driver and extending it to support more models in this series! See the model overview for more details. There are various rebadged versions sold by Conrad/Voltcraft, PeakTech, and probably other resellers.

All power supplies in this series have one channel only, featuring various voltage/current/power combinations though. They're connected to the PC via a (built-in) USB-to-serial IC (e.g. the SiLabs CP2102 in the Manson HCS-3202). A relatively simple ASCII-based protocol is used to communicate with the devices and control them.

You can control the power supplies e.g. via sigrok-cli like this:

 $ sigrok-cli -d manson-hcs-3xxx:conn=/dev/ttyUSB0 --show
 manson-hcs-3xxx - Manson HCS-3202 with 1 channel: CH1
 Supported configuration options:
    output_current: 0.000000
    output_current_limit: 0.000000
    output_enabled: on (current), off
    output_voltage: 3.390000
    output_voltage_target: 0.000000

 $ sigrok-cli -d manson-hcs-3xxx:conn=/dev/ttyUSB0 --samples 2 -O analog
 CH1: 3.300000 V DC
 CH1: 0.000000 A
 CH1: 3.380000 V DC
 CH1: 0.000000 A

 $ sigrok-cli -d manson-hcs-3xxx:conn=/dev/ttyUSB0 --config output_voltage_target=5.0 --set

 $ sigrok-cli -d manson-hcs-3xxx:conn=/dev/ttyUSB0 --config output_enabled=yes --set

The code was tested on the Manson HCS-3202 and the Voltcraft PPS-11815. Please let us know if you are able to test any of the other devices the driver is supposed to support, and/or whether you experience any issues.