NXP NXH3670 User guide

Brand: NXP

Model: NXH3670

Type: User guide

UM11148

NxH3670 HAPI gaming

Rev. 1.4 — 24 December 2019 User manual

Document information

Information Content

Keywords NxH3670, HAPI, gaming

Abstract This user manual describes the host interface commands of the NxH3670

gaming application.

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Revision history

Rev Date Description

v.1.4 20191224 Updates for G5.2

v.1.3 20190717 Added Known issues section and Test commands section.

Added new commands to the Test commands section.

Updated Typical sequences section.

v.1.2 20190402 Added Set ACL interval command, updated set audio latency command

v.1.1 20190320 updated issue

v.1 20181122 first issue

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1 Introduction

This document describes the host interface commands supported by the NxH3670

Gaming application.

How these commands and events can be sent over the SPI interface is explained in the

Host interface user manual (Ref. 1).

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2 Host API

This section starts with an explanation of the different states of the gaming application.

Then the commands and events are explained.

2.1 States

The NxH3670 can be in different states. The following state diagram shows these

possible states and the commands and events that trigger or are triggered during state

changes. In the sections below more details are given on these commands and events.

aaa-031756

BOOTING

1:PH_HCI_VS_APPLICATION_STARTED_SUB_EVENT

IDLE

2:PH_HCI_VS_CONNECT_CMD

CONNECTING

3:PH_HCI_VS_DEVICE_FOUND_SUB_EVENT

11:PH_HCI_VS_WRONG_FIRMWARE_VERSION_SUB_EVENT

6:PH_HCI_VS_CONFIGURE_AUDIO_INTERFACE_CMD

7:PH_HCI_VS_AUDIO_CONFIGURATION_CHANGED_SUB_EVENT

10:PH_HCI_VS_DEVICE_LOST_SUB_EVENT

8:PH_HCI_VS_CONNECT_CMD

9:PH_HCI_VS_DEVICE_LOST_SUB_EVENT

4:PH_HCI_VS_CONFIGURE_AUDIO_INTERFACE_CMD

5:PH_HCI_VS_ AUDIO_CONFIGURATION_CHANGED_SUB_EVENT

CONNECTED

pairing

PAIRING

STREAMING

Figure 1. NxH3670 state diagram

Table 1 gives the states of the NxH3670.

Table 1. NxH3670 states

State Description

booting The NxH3670 enters this state directly after power up. In this state, the memories

are initialized (by the host) and the NxH3670 executes its internal initialization

procedures (after PH_BOOTLOADER_VS_START_APPLICATION_CMD is

received). In this state, the NxH3670 already sends HCI events (see Section 3.1

for more information).

idle In this state, the NxH3670 is just waiting for commands. The radio is not active.

connecting In this state, the NxH3670 is not connected to a device yet. However, it is actively

searching for devices.

connected The NxH3670 has found a device and has successfully set up a connection.

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State Description

pairing In this state, the NxH3670 exchanges pairing information with the connected

device.

streaming The NxH3670 is connected and has opened audio connections with the other

device. Audio is streamed between both devices.

Commands or (external) events can cause transitions between these states. Below

an overview of the different transitions is given. The numbers match the numbers in

Figure 1.

1. When the initialization procedures have finished, the NxH3670 moves from the

booting state to the idle state. A PH_HCI_VS_APPLICATION_STARTED_SUB_EVENT

event is sent to indicate this transfer.

2. After the host (other than ‘none’) has selected the connection mode, the NxH3670

starts looking for other devices that are within range.

3. If a device is found, a PH_HCI_VS_DEVICE_FOUND_SUB_EVENT is sent to the host.

The state changes to ‘connected’.

4. The NxH3670 transitions to the ‘streaming’ state after the host issues

PH_HCI_VS_CONFIGURE_AUDIO_INTERFACE_CMD and enables audio connections.

This command can be issued before the NxH3670 is in the ‘connected’ state. In that

case, the NxH3670 immediately transition from ‘connected’ to ‘streaming’ state when

a connection has been established.

5. PH_HCI_VS_AUDIO_CONFIGURATION_CHANGED_SUB_EVENT is sent to inform the

host audio connections has been established and audio is being streamed.

6. The host can disable at any moment to stop audio streaming. When it does, the state

transitions to ‘connected’.

7. An event confirms that the audio is stopped.

8. If the connection mode is set to ‘none’, the other device is disconnected and the state

changes to ‘idle’.

9. When the other device moves out of range and the connections is lost, the host is

informed. PH_HCI_VS_DEVICE_LOST_SUB_EVENT is sent to the host and the state

changes to ‘idle’. It is up to the host to restart searching for the device by sending

PH_HCI_VS_CONNECT_CMD again.

10.If the connection mode indicates it can pair with other devices and an unpaired

device moves into range, the ‘pairing’ state is entered. In this state, the two devices

exchange pairing information. After the pairing procedure is finalized, the devices

disconnect and the host is informed (PH_HCI_VS_DEVICE_LOST_SUB_EVENT).

11.When another (paired or unpaired) device with a different

firmware version is in range, the host is informed using the event

PH_HCI_VS_WRONG_FIRMWARE_VERSION_SUB_EVENT.

2.2 Commands

2.2.1 Get version

This command can be used to retrieve the version of the firmware running on the

NxH3670.

Table 2. Get version

ID PH_HCI_VS_GET_VERSION_CMD

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Description This command can be used to retrieve the version of the firmware running on

the NxH3670.

Opcode 0xFC26

Parameters -

Preconditions -

Postconditions -

Comments The complete command sent in response to this command holds following

version information:

• UInt8 BlMajorVersion: major Bootloader version

• UInt8 BlMinorVersion: minor Bootloader version

• UInt16 hwMajorVersion: major hardware version

• UInt16 hwMinorVersion: minor hardware version

• UInt32 AppVersion: application version

• UInt8 status

7: heartbeat bit (is toggled each time the command is received)

6:0: 0 = Boot loader, 1 = Application (depending on the ROM vector overlay

mode setting)

Applicable for Dongle and headset

Synchronous/

Asynchronous

Synchronous

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2.2.2 Configure audio interface

To exchange digital audio, the host and the NxH3670 codec use an audio interface (I

S).

The NxH3670 is a slave on this bus. This interface consists of a forward and a backward

channel each containing a left channel and a right channel. When this interface is

enabled, all four channels contain audio data. If no valid audio is available, zero samples

are provided (for example, the right channel of the back channel is not used for the

gaming use case since it is just mono audio).

The NxH3670 relies on the I

S interface for its audio clock. With the configure audio

interface command, the host can inform the NxH3670 that the I

S interface is enabled or

that it wishes to disable it.

Before sending the configure audio interface command with an enabled channel,

the I

S interface must have the proper clocking. If the host must disable the I

clock, it must send the configure audio interface command with all channels

set to “0”. Then, before the host can disable the I

S clock, it must wait for a

PH_HCI_VS_AUDIO_CONFIGURATION_CHANGED_SUB_EVENT, which states that the

audio state is either “Stopped” or “Rejecting”.

In the context of this command, the meaning of forward and backward I

S and radio

channels is as follows:

• Forward I

S channels (corresponds to PC audio output)

– I

S channel from the host to the NxH3670 on the dongle.

– I

S channel from NxH3670 to the codec on the headset.

• Backward I

S channels (corresponds to PC audio input)

– I

S channel from the NxH3670 to the host on the dongle.

– I

S channel from the codec to the NxH3670 on the headset.

• Forward radio channel

– Radio channel from the dongle to the headset.

• Backward radio channel

– Radio channel from the headset to the dongle.

aaa- 031805

forward

radio channel

backward

radio channel

DONGLE

CODEC

NxH3670

forward

S channel

backward

S channel

forward

S channel

backward

S channel

HEADSET

NxH3670

HOST

Figure 2. Definition of forward and backward I

S and radio channels

Notes:

• In the current implementation, forwardAudioLeft, forwardAudioRight, and

backwardAudioLeft are all set to the same value (0 or 1); backwardAudioRight is

always 0 because the backward channel is mono audio sent over the left backward I

channel.

• The sampleWidth must be 16.

• The sampleRate must be 48000.

• When the audio channel is enabled/disabled, the audio is not faded in/faded out.

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Table 3. Configure audio interface

ID PH_HCI_VS_CONFIGURE_AUDIO_INTERFACE_CMD

Description This command configures the audio interface.

Opcode 0xFFF4

Parameters • UInt8 forwardAudioLeft:

0: Audio disabled.

1: Audio enabled.

• UInt8 forwardAudioRight:

0: Audio disabled.

1: Audio enabled.

• UInt8 backwardAudioLeft:

0: Audio disabled.

1: Audio enabled.

• UInt8 backwardAudioRight:

0: Audio disabled.

1: Audio enabled.

• UInt8 sampleWidth:

The number of bits per sample. Must be 16.

• UInt32 sampleRate:

The sample rate used on the audio interface. Must be 48000.

• UInt8 i2sWordLength:

– 16: use 16-bit word length

– 32: use 32-bit word length, the 16 bit sample is left aligned

Preconditions The I

S interface must be clocked at the indicated sample rate.

Postconditions Dongle

When connected, a change of the audio configuration results in the

transition between the connected and streaming states.

Headset

A change of the audio configuration does not result in changes to the

radio state, since the headset is a slave device regarding the radio link.

However, the host controller at the headset can choose to reject or

process the audio. It allows the host to disable the codec even if the radio

link is in the streaming state (e.g. for power reasons).

Comments The forward/backward radio channel status can change at any moment due

to connection issues (out-of-range, empty battery, etc.) If it does, a PH_HCI_

VS_AUDIO_CONFIGURATION_CHANGED_SUB_EVENT is sent to inform the

host of this event immediately.

Applicable for Dongle and headset

Synchronous/

Asynchronous

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2.2.3 Send user data

This command can be used to instruct the NxH3670 to send the provided user data to

the other device. TheNxH3670 sends a PH_HCI_VS_USER_DATA_QUEUED_SUB_EVENT

in response to this command and indicate if the data was queued correctly (due to buffer

overflow).

When the queued user data is eventually sent, no event is generated. When the user

data is received by the destination device, the host is not informed . If the host wants to

be informed of these events, it must implement its own protocol on top of the user data

pipe.

When the destination NxH3670 receives the user data, an event

PH_HCI_VS_USER_DATA_RECEIVED_SUB_EVENT (see Section 2.4.5) is sent to the

host of the destination.

aaa- 031807

NxH3670

HOST

PH_HCI_VS_USER_DATA_QUEUED_SUB_EVENT

PH_HCI_VS_SEND_USER_DATA_CMD

packet over the air

SOURCE

HOST

NxH3670

PH_HCI_VS_USER_DATA_RECEIVED_SUB_EVENT

DESTINATION

Figure 3. Host interfacing

The user data packet can be at most 23 bytes. If the user data is larger, the host must

packetize and reassemble it.

The NxH3670 tries to send one packet to the destination device every 40 ms. If the

destination device does not receive the packet correctly or the sender does not receive

the acknowledgement correctly, the packet is retransmitted after 40 ms. The NxH3670

never reports a retransmitted packet to the destination twice.

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aaa-031808

40 ms

source

destination

cke

event to host

3 3

Figure 4. User data exchange

In Figure 4, three queued user data packets are sent.

• Packet 1 is sent and received correctly by the destination. The destination sends an

acknowledgement back which is correctly received by the source. The host is informed

of the new user data.

• Packet 2 is sent but not received correctly by the destination. The second attempt goes

well and the acknowledgement is received correctly by the source. Again, an event is

sent to the host.

• Packet 3 is sent to the destination and received correctly. An event is sent to the

host. However, the acknowledgement is not received correctly by the source. The

source assumes that the packet was not received by the destination and resends

the packet. The destination receives the packet correctly but detects it was the same

packet as received previously. It does not report this packet to the host but sends an

acknowledgement. So, the source progresses to the next packet.

Multiple smaller queued packets are never combined in one bigger packet. Only one

packet is transmitted every 40 ms.

There are two completely independent user data pipes (one from dongle to headset and

one from headset to dongle).

A reliable BLE ACL connection is used to transfer this user data. If the connection is not

lost, the queued user data is received correctly eventually. If the connection is lost shortly

after user data is queued, it is unpredictable whether the user data has made it or not.

When the connection is lost, any queued user data is flushed. When the connection is

lost, no events (except PH_HCI_VS_DEVICE_LOST_SUB_EVENT) are generated.

When a connection has been set up and is stable (not in the process of setting up or

breaking down the audio link for example), the queue depth is typically 4 packets.

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Table 4. Send user data

ID PH_HCI_VS_SEND_USER_DATA_CMD

Description This command sends the requested data to the given device.

Opcode 0xFFF3

Parameters • UInt8 destination:

0: Reserved

1: Reserved

2: Headset LeftAndRight (only valid at dongle side)

3: Headset Unspecified (only valid at dongle side)

Dongle (only valid at headset side)

• UInt8 data[ ]: The data to send to the other device. Valid length [1..23]

Preconditions A connection to the other device must have been established already. The

event PH_HCI_VS_DEVICE_FOUND_SUB_EVENT can be used to track this. If

not, a command-complete event with an error status is returned.

Postconditions • When the data has been queued or when an error occurred, a PH_HCI_

VS_USER_DATA_QUEUED_SUB_EVENT event is sent. When no error is

reported, it does not mean that the data has already been sent.

• If no error is reported, the device can immediately send other user data

using this command.

• If a queue-full error is reported, the user must retry until no error is reported

anymore.

• When the user data is received, the destination device gets a PH_HCI_VS_

USER_DATA_RECEIVED_SUB_EVENT.

Comments

Applicable for Dongle and headset

Synchronous/

Asynchronous

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2.2.4 Persistent data stored

The NxH3670 has no onboard persistent memory. It relies on the host to store and

retrieve the persistent data required for the correct operation of the NxH3670. The host

must treat this data as raw data and store or retrieve it at/from the requested location.

The host is free to decide where and how to store this data persistently.

Whenever the NxH3670 must store persistent data, it indicates this requirement by

sending an event PH_HCI_VS_STORE_PERSISTENT_DATA_SUB_EVENT containing

the address and data to store. When the host has stored the data, it must indicate the

completion of it by sending this command (see Section 3.2 for an example).

Table 5. Persistent data stored

ID PH_HCI_VS_PERSISTENT_DATA_STORED_CMD

Description This command is an indication for the NxH3670 that the previous request to

store persistent data is completely handled by the host.

Opcode 0xFFF0

Parameters • UInt8 status:

2: The length/offset is too high and leads to reading/writing out of bounds

3: The erase step in programming the flash failed

4: The program step in programming the flash failed

Preconditions An event PH_HCI_VS_STORE_PERSISTENT_DATA_SUB_EVENT is received

and the containing data is stored in persistent data at the given offset.

Postconditions -

Comments

Applicable for Dongle and headset

Synchronous/

Asynchronous

Synchronous

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2.2.5 Persistent data retrieved

The NxH3670 has no onboard persistent memory. It relies on the host to store and

retrieve the persistent data required for the correct operation of the NxH3670. The host

must treat this data as raw data and store or retrieve it at/from the requested location.

The host is free to decide where and how to store this data persistently.

Whenever the NxH3670 wants to retrieve persistent data it indicates this requirement by

sending an event PH_HCI_VS_RETRIEVE_PERSISTENT_DATA_SUB_EVENT containing

the address and length of the persistent data it wants to read. When the host has read

the data, it must return this data to the host with this command.

Table 6. Persistent data retrieved

ID PH_HCI_VS_PERSISTENT_DATA_RETRIEVED_CMD

Description This command must be used to send the requested persistent data to the Nx

H3670.

Opcode 0xFFF1

Parameters • UInt8 data[ ]:

The data as retrieved from the given location in the persistent memory.

Preconditions An event PH_HCI_VS_RETRIEVE_PERSISTENT_DATA_SUB_EVENT was

received and the requested data is read from the persistent memory of the

host.

Postconditions -

Comments

Applicable for Dongle and headset

Synchronous/

Asynchronous

Synchronous

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2.2.6 Connect

This command instructs the NxH3670 to start looking for devices in range with given

position and pair the device if necessary.

The headset broadcasts position ‘LeftAndRight’. When the dongle connection mode is

set to ‘LeftAndRight’, it starts searching for a headset with position ‘LeftAndRight’. If such

a device is found in (pairing) range and not yet paired, it first pairs the device. If a device

is found that is already paired, it immediately connects to that device.

Table 7. Connect

ID PH_HCI_VS_CONNECT_CMD

Description This command can be used to connect to another device.

Opcode 0xFFF2

Parameters • UInt8 mode:

– 0: None:

The dongle does not search and connect to other devices. If a connection

was already established, it disconnects.

– 1: LeftAndRight:

The dongle searches for a headset with position LeftAndRight and, when

it is found, sets up a connection. If not yet paired, it pairs this device first.

The host is informed of this through the event PH_HCI_VS_DEVICE_FOU

ND_SUB_EVENT. Only valid on dongle.

– 2: Dongle:

Search for one of the dongles paired to us. Only valid on headset.

Preconditions Proper device parameters must be available (stored as persistent data). The

device parameters can be retrieved by sending PH_HCI_VS_GET_DEVICE_P

ARAMETERS_CMD.

If no proper device parameters are available, PH_HCI_VS_SET_DEVICE_PA

RAMETERS_CMD can be used to set them.

Postconditions -

Comments

Applicable for Headset and dongle

Synchronous/

Asynchronous

Synchronous

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2.2.7 Configure power amplifier

An external antenna power amplifier can be connected to the NxH3670. This command

enables two signals (SWM8 and SWM9) required to control the power amplifier.

Table 8. Configure power amplifier

ID PH_HCI_VS_CONFIGURE_PA_CONTROL_CMD

Description An external antenna power amplifier can be connected to the NxH3670. This

command enables two signals required to control the power amplifier.

Opcode 0xFFF8

Parameters • UInt8 mode:

– 0: The NxH3670 radio does not control the SWM pins.

– 1: The NxH3670 radio controls the SWM pins.

Preconditions -

Postconditions -

Comments

Applicable for Dongle and headset

Synchronous/

Asynchronous

Synchronous

2.2.8 Set pairing threshold

To determine the distance to the device, pairing by proximity uses the signal strength

(RSSI). When a device is considered close enough to pair, this command allows the

configuring of the RSSI threshold.

Table 9. Set pairing threshold

ID PH_HCI_VS_SET_PAIRING_THRESHOLDS_CMD

Description To determine the distance to the device, pairing by proximity uses the signal

strength (RSSI). When a device is considered close enough to pair, this

command allows the configuring of the RSSI threshold.

Opcode 0xFFF9

Parameters • Int16 rssiThreshold. Default: −55

Preconditions -

Postconditions Depending on the pairing connection mode, the NxH3670 pairs a device

when the RSSI level exceeds rssiThreshold. For more information, see PH_H

CI_VS_CONNECT_CMD.

Comments Using the command PH_HCI_VS_GET_LQI_REPORT_CMD to receive a report

with the current RSSI level results in an indication of the RSSI value to use.

Applicable for Dongle

Synchronous/

Asynchronous

Synchronous

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2.2.9 Set LQI thresholds

The NxH3670 can be requested to send some link quality indicators. One type of

indicator is the raw packet-error-rate (PER) (in percentage) of the last 585 expected

packets from a specific device. An audio frame is retransmitted on failure, which may

result in a PER > 0 but without resulting audio artifacts. This command sets the PER

upper and lower thresholds. Every time the PER exceeds the higherThreshold and drops

again to below the lowerThreshold and vice versa, an event is sent.

Table 10. Set LQI thresholds

ID PH_HCI_VS_SET_LQI_THRESHOLDS_CMD

Description This command sets the PER upper and lower thresholds.

Opcode 0xFFFA

Parameters • UInt16 perLowerThreshold:

The lower PER threshold. Default: 0; valid range [0, 100]

• UInt16 perHigherThreshold:

The higher PER threshold. Default: 100; valid range [0, 100]

Preconditions -

Postconditions Every time the PER exceeds the higherThreshold and drops again to below

the lowerThreshold and vice versa, the NxH3670 sends a PH_HCI_VS_LQI_

REPORT_SUB_EVENT.

Comments

Applicable for Dongle and headset

Synchronous/

Asynchronous

Synchronous

2.2.10 Get LQI report

This command instructs the NxH3670 to send an LQI report.

Table 11. Get LQI report

ID PH_HCI_VS_GET_LQI_REPORT_CMD

Description This command instructs the NxH3670 to send an LQI report.

Opcode 0xFFFB

Parameters -

Preconditions The selected device must be connected.

Postconditions The NxH3670 sends a PH_HCI_VS_LQI_REPORT_SUB_EVENT.

Comments

Applicable for Dongle and headset

Synchronous/

Asynchronous

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2.2.11 Set xtal properties

This function allows the configuring of the xtal specific properties, like load capacitors and

start-up time.

For more details see the NxH3670 radio application note (Ref. 1).

Table 12. Set xtal properties

ID PH_HCI_VS_SET_XTAL_PROPERTIES_CMD

Description This function allows the configuring of the xtal specific properties, like load

capacitors and start-up time.

Opcode 0xFFFD

Parameters • UInt8 capIn; valid range [0. 127]

• UInt8 capOut; valid range [0. 127]

• UInt16 startupTime:

The xtal start-up time in microseconds.

Preconditions This function must be called immediately after the application reported a PH_

HCI_VS_APPLICATION_STARTED_SUB_EVENT.

Postconditions -

Comments

Applicable for Dongle and headset

Synchronous/

Asynchronous

Synchronous

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2.2.12 Get pairing information

This function returns information about the paired devices. The application can use this

information to select the right connection mode. For example, if all required devices are

paired, the application can start normal operation.

Table 13. Get pairing information

ID PH_HCI_VS_GET_PAIRING_INFO_CMD

Description This function returns information about the paired devices.

Opcode 0xFFFC

Parameters -

Preconditions -

Postconditions The command-complete event sent in response to this command holds

information about the pairing:

• Bit 0: Reserved

• Bit 1: Reserved

• Bit 2: 1 if a LeftAndRight headset is paired, else 0 (Dongle only).

• Bit 3: Reserved

Comments

Applicable for Dongle

Synchronous/

Asynchronous

Synchronous

2.2.13 Erase pairing information

This function erases the previously stored pairing information. This information is stored

in persistent memory. It is typically used when a user wants to pair a dongle to a new/

other headset.

Table 14. Erase pairing info

ID PH_HCI_VS_ERASE_PAIRING_INFO_CMD

Description This function erases the pairing information which is part of the persistent

data.

Opcode 0xFFE2

Parameters -

Preconditions -

Postconditions The correct fields are cleared from persistent memory, an event PH_HCI_

VS_PAIRING_INFO_ERASED_SUB_EVENT is generated.

Comments After erasing the pairing info, a system reboot is required to bring the device

to pairing mode again.

Applicable for Dongle

Synchronous/

Asynchronous

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2.2.14 Set device parameters

This function sets the device-specific parameters. This information is stored in persistent

memory and hence must be called only once. This function is typically used during

production to set device-specific values like the BD_ADDRESS and the encryption root

(ER).

To apply the new settings (after

PH_HCI_VS_DEVICE_PARAMETERS_STORED_EVENT has been received), the

device must be reset.

Table 15. Set device parameters

ID PH_HCI_VS_SET_DEVICE_PARAMETERS_CMD

Description This function sets the device-specific parameters.

Opcode 0xFFFE

Parameters • UInt8 bdAddress[6]:

The BD_ADDRESS to assign to this device.

• UInt8 er[16]: The encryption root of this device.

• UInt8[16] ir: The identity root of this device.

Preconditions To prevent memory wear-out on the host controller, check the presence of

device parameters using PH_HCI_VS_GET_DEVICE_PARAMETERS_CMD .

Postconditions The fields are written to persistent memory. When the parameters are

stored, an event PH_HCI_VS_STORE_PERSISTENT_DATA_SUB_EVENT is

generated.

Comments When the device parameters are stored, a PH_HCI_VS_DEVICE_

PARAMETERS_STORED_EVENT is generated.

As the device parameters are static throughout the lifetime of a product, this

command must only be used once during production.

Applicable for Dongle and headset

Synchronous/

Asynchronous

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NxH3670 HAPI gaming

User manual Rev. 1.4 — 24 December 2019

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2.2.15 Get device parameters

This function retrieves the persistently stored device parameters. This function is used to

retrieve values like the BD_ADDRESS, ER (encryption root), and IR (identity root).

Table 16. Get device parameters

ID PH_HCI_VS_GET_DEVICE_PARAMETERS_CMD

Description This function gets the device-specific parameters.

Opcode 0xFF05

Parameters -

Preconditions -

Postconditions A command complete is sent containing

• UInt8[6] bdAddress: The BD_ADDRESS assigned to this device.

• UInt8[16] er: The encryption root of this device.

• UInt8[16] ir: The identity root of this device

Comments

Applicable for Dongle and headset

Synchronous/

Asynchronous

Synchronous

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NXP NXH3670 User guide

NXP NXH3670 User guide

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