NFC services

nfc:am

This is "nn::nfc::am::detail::IAmManager".

Cmd	Name
0	CreateAmInterface

IAm

This is "nn::nfc::am::detail::IAm".

Cmd	Name
0	Initialize
1	Finalize
2	NotifyForegroundApplet

nfc:mf:u

This is "nn::nfc::mifare::detail::IUserManager".

Cmd	Name
0	CreateUserInterface

IUser

This is "nn::nfc::mifare::detail::IUser".

Cmd	Name
0	#Initialize
1	#Finalize
2	#ListDevices
3	StartDetection
4	StopDetection
5	Read
6	Write
7	GetTagInfo
8	GetActivateEventHandle
9	GetDeactivateEventHandle
10	#GetState
11	#GetDeviceState
12	GetNpadId
13	[3.0.0+] GetAvailabilityChangeEventHandle

nfc:user

This is "nn::nfc::detail::IUserManager".

Cmd	Name
0	CreateUserInterface

IUser

This is "nn::nfc::detail::IUser".

Cmd	Name
0	InitializeOld
1	FinalizeOld
2	#GetStateOld
3	#IsNfcEnabledOld
400	[4.0.0+] #Initialize
401	[4.0.0+] #Finalize
402	[4.0.0+] #GetState
403	[4.0.0+] #IsNfcEnabled
404	[4.0.0+] #ListDevices
405	[4.0.0+] #GetDeviceState
406	[4.0.0+] GetNpadId
407	[4.0.0+] AttachAvailabilityChangeEvent
408	[4.0.0+] StartDetection
409	[4.0.0+] StopDetection
410	[4.0.0+] GetTagInfo
411	[4.0.0+] AttachActivateEvent
412	[4.0.0+] AttachDeactivateEvent
1000	[4.0.0+] #ReadMifare
1001	[4.0.0+] #WriteMifare
1300	[4.0.0+] #SendCommandByPassThrough
1301	[4.0.0+] #KeepPassThroughSession
1302	[4.0.0+] #ReleasePassThroughSession

GetStateOld

No input, returns an output u32.

IsNfcEnabledOld

No input, returns an output bool.

This runs the same code as #IsNfcEnabled.

GetState

No input, returns an output u32.

This replaces #GetStateOld.

IsNfcEnabled

No input, returns an output bool.

This replaces #IsNfcEnabledOld.

nfc:sys

This is "nn::nfc::detail::ISystemManager".

Cmd	Name
0	CreateSystemInterface

ISystem

This is "nn::nfc::detail::ISystem".

Cmd	Name
0	#Initialize
1	#Finalize
2	#GetStateOld
3	#IsNfcEnabledOld
100	#SetNfcEnabledOld
400	[4.0.0+] InitializeSystem
401	[4.0.0+] FinalizeSystem
402	[4.0.0+] #GetState
403	[4.0.0+] #IsNfcEnabled
404	[4.0.0+] #ListDevices
405	[4.0.0+] #GetDeviceState
406	[4.0.0+] GetNpadId
407	[4.0.0+] AttachAvailabilityChangeEvent
408	[4.0.0+] StartDetection
409	[4.0.0+] StopDetection
410	[4.0.0+] GetTagInfo
411	[4.0.0+] AttachActivateEvent
412	[4.0.0+] AttachDeactivateEvent
500	[4.0.0+] #SetNfcEnabled
510	[7.0.0+] #OutputTestWave
1000	[4.0.0+] #ReadMifare
1001	[4.0.0+] #WriteMifare
1300	[4.0.0+] #SendCommandByPassThrough
1301	[4.0.0+] #KeepPassThroughSession
1302	[4.0.0+] #ReleasePassThroughSession

SetNfcEnabledOld

Takes an input bool, no output.

This runs the same code as #SetNfcEnabled.

SetNfcEnabled

Takes an input bool, no output.

This replaces #SetNfcEnabledOld.

OutputTestWave

Takes an input bool and a #TestWaveType, no output.

ReadMifare

Takes an input #DeviceHandle, a type-0x6 output buffer containing an array of #MifareReadBlockData, a type-0x5 input buffer containing an array of #MifareReadBlockParameter, no output.

sdknso passes the same user-specified array-count for both buffers.

WriteMifare

Takes an input #DeviceHandle, a type-0x5 input buffer containing an array of #MifareWriteBlockParameter, no output.

SendCommandByPassThrough

Takes an input #DeviceHandle, a nn::TimeSpan timeout, a type-0x6 output buffer, a type-0x5 input buffer, returns an output u32 out_size.

sdknso copies the output u32 into an u64. This is the actual size which was copied into the output buffer.

This allows using a raw NFC command. The input buffer contains the command data (id + params), and the output buffer contains the response.

KeepPassThroughSession

Takes an input #DeviceHandle, no output.

ReleasePassThroughSession

Takes an input #DeviceHandle, no output.

nfp:user

This is "nn::nfp::detail::IUserManager".

Cmd	Name
0	CreateUserInterface

IUser

This is "nn::nfp::detail::IUser".

Cmd	Name
0	#Initialize
1	#Finalize
2	#ListDevices
3	StartDetection
4	StopDetection
5	Mount
6	Unmount
7	OpenApplicationArea
8	GetApplicationArea
9	SetApplicationArea
10	Flush
11	Restore
12	CreateApplicationArea
13	GetTagInfo
14	GetRegisterInfo
15	GetCommonInfo
16	GetModelInfo
17	AttachActivateEvent
18	AttachDeactivateEvent
19	#GetState
20	#GetDeviceState
21	GetNpadId
22	GetApplicationAreaSize
23	[3.0.0+] AttachAvailabilityChangeEvent
24	[3.0.0+] RecreateApplicationArea

Initialize

Takes a PID, an AppletResourceUserId, an u64, a type-0x5 input buffer containing an array of #RequiredMcuVersionData, no output.

sdknso passes value 0 for the u64.

Internally this is mostly the same for each service, this differs depending on the service/cmd however.

Finalize

No input/output.

Internally this is mostly the same for each service, this differs depending on the service/cmd however.

ListDevices

Takes a type-0xA output buffer containing an array of #DeviceHandle, returns an output s32 total_out.

This can return a maximum of 0xA entries.

GetDeviceState

Takes an input #DeviceHandle, returns an output u32.

The returned u32 is loaded from a lookup table. nfp services uses the same table, mifare uses a separate one, and the nfc services use another separate table.

nfp:dbg

This is "nn::nfp::detail::IDebugManager".

Cmd	Name
0	CreateDebugInterface

IDebug

This is "nn::nfp::detail::IDebug".

Cmd	Name
0	InitializeDebug
1	FinalizeDebug
2	#ListDevices
3	StartDetection
4	StopDetection
5	Mount
6	Unmount
7	OpenApplicationArea
8	GetApplicationArea
9	SetApplicationArea
10	Flush
11	Restore
12	CreateApplicationArea
13	GetTagInfo
14	GetRegisterInfo
15	GetCommonInfo
16	GetModelInfo
17	AttachActivateEvent
18	AttachDeactivateEvent
19	#GetState
20	#GetDeviceState
21	GetNpadId
22	GetApplicationArea2
23	[3.0.0+] AttachAvailabilityChangeEvent
24	[3.0.0+] RecreateApplicationArea
100	Format
101	GetAdminInfo
102	GetRegisterInfo
103	SetRegisterInfo
104	DeleteRegisterInfo
105	DeleteApplicationArea
106	ExistsApplicationArea
200	GetAll
201	SetAll
202	FlushDebug
203	BreakTag
204	ReadBackupData
205	WriteBackupData
206	#WriteNtf
300	[3.0.0-3.0.2]
301	[3.0.0-3.0.2]
302	[3.0.0-3.0.2]
303	[3.0.0-3.0.2]
304	[3.0.0-3.0.2]
305	[3.0.0-3.0.2]
306	[3.0.0-3.0.2]
307	[3.0.0-3.0.2]
308	[3.0.0-3.0.2]
309	[3.0.0-3.0.2]
310	[3.0.0-3.0.2]
311	[3.0.0-3.0.2]
312	[3.0.0-3.0.2]
313	[3.0.0-3.0.2]
314	[3.0.0-3.0.2]

WriteNtf

Takes an input #DeviceHandle, an u32, a type-0x5 input buffer, no output.

The input buffer size must match 0x2A0.

This handles Amiibo crypto etc.

nfp:sys

This is "nn::nfp::detail::ISystemManager".

Cmd	Name
0	CreateSystemInterface

ISystem

This is "nn::nfp::detail::ISystem".

Cmd	Name
0	InitializeSystem
1	FinalizeSystem
2	#ListDevices
3	StartDetection
4	StopDetection
5	Mount
6	Unmount
10	Flush
11	Restore
13	GetTagInfo
14	GetRegisterInfo
15	GetCommonInfo
16	GetModelInfo
17	AttachActivateEvent
18	AttachDeactivateEvent
19	#GetState
20	#GetDeviceState
21	GetNpadId
23	[3.0.0+] AttachAvailabilityChangeEvent
100	Format
101	GetAdminInfo
102	GetRegisterInfo
103	SetRegisterInfo
104	DeleteRegisterInfo
105	DeleteApplicationArea
106	ExistsApplicationArea

RequiredMcuVersionData

In sdknso, the global data containing the array data for this is "nn::nfc::client::RequiredMcuVersionData". The array entry is 0x20-bytes.

DeviceHandle

This is "nn::nfc::DeviceHandle". This is a 8-byte struct with 4-byte alignment.

TestWaveType

This is u32 enum "nn::nfc::TestWaveType".

MifareReadBlockData

This is "nn::nfc::MifareReadBlockData". This is a 0x18-byte struct.

MifareReadBlockParameter

This is "nn::nfc::MifareReadBlockParameter". This is a 0x18-byte struct.

MifareWriteBlockParameter

This is "nn::nfc::MifareWriteBlockParameter". This is a 0x28-byte struct.

RomFS

[9.0.0+] The nfc-sysmodule RomFS contains:

 ST21NFCD_01_05_6811.bin

These are firmware files for the NFC IC inside Switch Lite units.

Application IDs

Application IDs (also referenced as "access_id" in official software) are game-unique u32s used to access the amiibo 0xd8-big application area.

Game	AppID
Super Smash Bros. Ultimate	0x34f80200