I2C Services
I2C Service Names
| Service names | Notes | Accessible deviceIDs | Service used by sysmodule |
|---|---|---|---|
| "i2c::MCU" | 0, 3 | MCU | |
| "i2c::CAM" | 1, 2, 4 | Camera | |
| "i2c::LCD" | 5, 6 | GSP | |
| "i2c::DEB" | 7, 8 | Unknown | |
| "i2c::HID" | 9, 10, 11, 12 | HID | |
| "i2c::IR" | 13, and additionally for New3DS i2c module: 17 | IR | |
| "i2c::EEP" | 14 | Cfg | |
| "i2c::NFC" | Only available via the New3DS i2c sysmodule. | 15 | New3DS NFC |
| "i2c::QTM" | Only available via the New3DS i2c sysmodule. | 16 | New3DS QTM |
Each I2C service can only access certain I2C device(s). When the specified deviceid isn't accessible, error 0xE0A02FEA is returned.
I2C Service
| Command Header | Description | Available since system-version |
|---|---|---|
| 0x00010100 | ReplaceRegisterBits8 | All |
| 0x000200C0 | SetRegisterBits8 | All |
| 0x000300C0 | ClearRegisterBits8 | All |
| 0x00040102 | MultiReplaceRegisterBits16 | All |
| 0x000500C0 | WriteRegister8 | All |
| 0x00060080 | WriteDeviceRaw8 | All |
| 0x000700C0 | WriteRegister16 | All |
| 0x000800C2 | MultiWriteRegister16 | All |
| 0x00090080 | ReadRegister8 | All |
| 0x000A0080 | ReadRegister16 | All |
| 0x000B00C2 | WriteRegisters8 | All |
| 0x000C00C2 | WriteRegisters16 | All |
| 0x000D00C0 | ReadRegisters8 | All |
| 0x000E00C2 | WriteRegisters8_2 | All |
| 0x000F00C0 | LegacyReadRegisters8 | All |
| 0x001000C0 | ReadRegisters16 | All |
| 0x001100C2 | WriteRegistersBuffer8 | All |
| 0x001200C2 | ReadRegistersBuffer8 | All |
| 0x00130040 | ReadDeviceRaw8 | 8.0.0-18 |
| 0x00140082 | WriteDeviceRaw | 8.0.0-18 |
| 0x00150080 | ReadDeviceRaw | 8.0.0-18 |
Commands 0x00130040..0x00150080 are only usable with the New3DS i2c module: on Old3DS the actual command-handler function for each of these commands just return an error. Commands 0x00140082 and 0x00150080 are used by NFC module. Command 0x00150080 is also used for reading ZL, ZR, and C-stick data by IR Services.