RGB Control
From HackTheIBus
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Description
The message type 0x4F configures how the RGB (Red/Green/Blue) video signal that is sent from VM or NAVE to the BMBT monitor is displayed. The second data byte is not always sent.
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Format
| Message code | 0x4F |
|---|---|
| Message length | 6 or 7 bytes |
| Data size | 1 or 2 bytes |
| Frequency | when changing display sources |
| DB1 | DB2 |
|---|---|
| control | mode |
The Bits of the control byte
| Bit | meaning | 0 | 1 |
|---|---|---|---|
| 7 | ? | x | x |
| 6 | ? | x | x |
| 5 | ? | x | x |
| 4 | LCD on/off | off | on |
| 3 | ? | x | x |
| 2 | ? | x | x |
| 1 | Input GT | no | yes |
| 0 | Input VM | no | yes |
The Bits of the mode byte
| Bit | meaning | 0 | 1 |
|---|---|---|---|
| 7 | ? | x | x |
| 6 | ? | x | x |
| 5 | zoomed view | normal | zoom |
| 4 | aspect ratio | 4:3 | 16:9 |
| 3 | ? | x | x |
| 2 | ? | x | x |
| 1 | refresh rate | 60Hz | 50Hz |
| 0 | ? | x | x |
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Example
to be defined
| Meaning | IKE | len | BMBT | type | x | x | CS |
|---|---|---|---|---|---|---|---|
| Value | 80 | 0F | F0 | 4F | x | x | x |
