AV: Set Main Left/Right Speaker Volume¶
FAST Serial Protocol: Overview & First Steps
This documentation section is about the FAST Serial Protocol (FSP) commands, which are the low-level commands a host computer sends to a FAST board. Most FAST Pinball makers do not need to know about these details, since the pinball game framework (such as the Mission Pinball Framework) handles this communication for you.
If you're writing your own game framework, read the overview of how FSP works and how to connect first.
This section of the documentation is not yet complete and will be coming soon. However, if you need this now, and/or you want to share what documentation is most important to you, please email Brian. Thanks!
AV: command is used to set the main left/right speaker volume of the FAST Audio Interface Board. The volume level is a value between
0x3f (decimal 0-63). The mode of the audio system can affect the speaker behavior. See the
AM: command for details. Depending on the mode set, the speakers can be disabled or do automatic crossfade when the headphones are plugged in.
Data is a a volume value from
The return value is the same as what was passed in.
AV:18<CR> will return
AV:18<CR>, confirming the speaker volume was set to 18 hex, which is 24 decimal, or about 38% volume (24/63).
If the mode of the headphone is set to
AM: command) the left/right volume channel will increase or decrease over time based on the new settings.
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