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
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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