21a43d7204
Needs more testing and an appropriate API for such (non-audio) DACs. For now one can set the output value using sysctl node. Also sysmon(4) will conveniently report the voltage on Vout pin of the DAC. Note that this is not an actual measured voltage, but merely calculated using equation from datasheet. Real voltage might be different and depend on analog circuitry attached to the DAC.