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166 bytes added ,  16:36, 14 April 2015
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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]].
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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.
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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.
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This is the NFC service used by regular applications.
 
This is the NFC service used by regular applications.
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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.
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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"==
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| None
 
| None
 
| s32 result
 
| s32 result
| Among other things, this will eventually call the savedata code referenced in the below savedata section.
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| Among other things, this will eventually call the savedata writing code referenced in the below savedata section.
 
|-
 
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| 0x040D0000
 
| 0x040D0000
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=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?
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* "/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).

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