On-Board Firmware for the Twisted Pear Audio - Buffalo 3-SE-Pro DACs
AVR - ATTiny85 Fuse bytes:
- Low: 0xE2
- High: 0xD5
- Ext: 0xFF
The switches are connected to the Port Expander GPIO pins with weak pull-ups enabled. The other end of the switch is connected to GND - thus "Off" is open and results in logic 1 and "On" is closed and results in logic 0.
| Position(s) | Name | On | Off | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Input Select | SPDIF | SERIAL(PCM/DSD) | ||||||||||||||||||||||||||||||||||||
| 2-3 | PCM Format |
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| 4-5 | PCM Word Length |
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| 6-8 | Filter Selection |
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| Position(s) | Name | On | Off | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Automute | DISABLE | ENABLE | |||||||||||||||
| 2 | OSF | ENABLED | DISABLED | |||||||||||||||
| 3-4 | IIR Filter Bandwidth |
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| 5-8 | 4bit DPLL Bandwidth (switch 5 is the low bit) | on = 0 off = 1 - 0b0000=default 0b0001=lowest 0b1111=highest | ||||||||||||||||
The MIT License (MIT)
Copyright (c) 2017 Russ White
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