Communication Protocol
•Checksum (1 byte): Frame checksum: 8 least significant bit of the sum of: Channel + Protocol Command + Data Length + Data.
In the following discussion, the Channel parameter is set to FFh.
3.3Remote Controller - AT83SND2CMP3 Command Set List
There are several command types:
System Command: these commands allow to configure the system.
Player Command: these commands allow to access all the Player’s functions.
File System Command: these commands allow to navigate in selected memory: file and directory architecture for the Card Memory.
Streaming Memory Driver Interface Command: these commands allow the Remote Controller to stream MP3 music upon Player’s requests.
Custom Command: these commands allow the Remote Controller to do specific requests.
Table
Protocol Command | Command | Data | Description | |
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SYSTEM_RESET | 00h | No | Software reset the AT83SND2CMP3. There is no answer for this | |
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| command. Refer to Player Reset section. | |
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SYSTEM_CONFIG | 01h | Yes | Configure the player in a | |
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SYSTEM_GET_STATUS | 02h | No | Asks the Player Status byte | |
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SYSTEM_AUDIO_OUTPUT | 03h | 1 Byte | Select Player Audio Output: | |
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| • | Headset |
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| • Headset and Power Amplifier | |
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SYSTEM_SELECT_MEMORY | 04h | 1 Byte | Select Memory on: | |
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| • | NandFlash (NF)AT83SND2CMP3 |
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| • Card (SD/ MMC) connected to AT83SND2CMP3 | |
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| When FAT is mounted, FNA is set in Player’s status (refer to | |
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SYSTEM_SET_SOUND | 05h | 5 Bytes | Set digital sound and digital equalization. | |
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| Refer to set sound command description | |
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SYSTEM_POWER_DOWN | 06h | No | Power Down the Player | |
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SYSTEM_WAKEUP | 07h | No | ||
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| Warning: this command requires AT83SND2CMP3 RXD line | |
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| connected to INTO pin (P3.2) in hardware. | |
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SYSTEM_USB_DETACH | 08h | No | Ask the Player to perform an USB Mass Storage detach. | |
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SYSTEM_USB_CONNECT | 09h | No | Ask the Player to perform an USB Mass Storage PC Connection. | |
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Reserved | 0Ah | No | Reserved. | |
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SYSTEM_VOLUME_UP | 0Bh | No | Analog Gain control volume up | |
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SYSTEM_VOLUME_DOWN | 0Ch | No | Analog Gain control volume down | |
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AT83SND2CMP3 User Guide |