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The New3DS NFC module was added with [[8.1.0-0_New3DS]]. The Old3DS NFC module was added with [[9.3.0-21|9.3.0-X]].
The New3DS NFC module was added with [[8.1.0-0_New3DS]]. The Old3DS NFC module was added with [[9.3.0-21|9.3.0-X]].
On New3DS NFC module uses the NFC hardware via the [[I2C_Services|i2c::NFC]] and [[GPIO_Services|gpio:NFC]] services. On Old3DS NFC module communicates with a NFC peripheral via IR with the IRUSER service.
On New3DS NFC module uses the [[I2C_Registers|NFC]] hardware via the [[I2C_Services|i2c::NFC]] and [[GPIO_Services|gpio:NFC]] services. On Old3DS NFC module communicates with a NFC peripheral via IR with the IRUSER service.
A total of 6 sessions can be open simultaneously for all of these services combined.
A total of 6 sessions can be open simultaneously for all of these services combined.
This is the NFC service used by regular applications.
This is the NFC service used by regular applications.
This was first seen in the Super Smash Bros eShop demo (only in the exheader, the demo doesn't actually use it), but at that time no system-module was available for NFC on CDN. The first regular application to use this service was Super Smash Bros, with the v1.0.5 game-update, which used the new 9.3.0-21 command set.
This was first seen in the Super Smash Bros eShop demo (only in the exheader, the demo doesn't actually use it), but at that time no system-module was available for NFC on CDN. The first regular application to use this service was Super Smash Bros, with the v1.0.5 game-update, which used the new 9.3.0-X command set.
==NFC management service "nfc:m"==
==NFC management service "nfc:m"==
| None
| None
| s32 result
| s32 result
| Among other things, this will eventually call the savedata code referenced in the below savedata section.
| Among other things, this will eventually call the savedata writing code referenced in the below savedata section.
|-
|-
| 0x040D0000
| 0x040D0000
=NFC module savedata=
=NFC module savedata=
* "/nfp_backup.dat" Going by the filename this seems to contain data backed up from amiibo. The NFC module from [[9.3.0-21|9.3.0-X]] doesn't seem to do any actual reading from this, just writing?
* "/nfp_backup.dat" Going by the filename this seems to contain data backed up from amiibo. The filesize is 0x001fbd20-bytes. Certain service cmds will trigger writing to this savedata. This entire file is also read during NFC module / [[amiibo Settings]] startup(unknown if this is done during NFC module startup or via a service cmd).