# 92 questions

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## Where is the latest User Guide for Gazell?

Hi,

the documentation page of Gazell warns that it is outdated.

Warning: This is old documentation, and should only be used for historic reference. Please go here to find the latest.

documentation page

But where do I find the latest ... (more)

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Hi ,all

I have a problem in my project .I want to use gzp preload ack feature .When the host receives datas ,I would use this function "void gzp_preload_ack(uint8_t* src, uint8_t length, uint8_t pipe)" to send datas to the ... (more)

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## Error in Gazell diagram? [closed]

I am not sure whether there is a small error in a Gazell packet transaction diagram, or if I have an incorrect understanding. From Gazell user guide:

If only the ACK packet sent from the Host to the Device is ...

(more)

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## looking for example Gazell project on Nrf52840

I am looking at using two Nrf52840 on Custom PCBs to create a wireless link from my product to a PC one 840 would be the host and would be wired to the PC using USB (HID,MSC,CDC) and ... (more)

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## [GZP] Two gazelle "slaves" pairing with each other

Hello,

I have two identical devices with Laird's BL600 chip (that uses NRF51822). They are initialized as NRF_GZLL_MODE_DEVICE and use GZP library (without encryption - only pipe no 2 is used). They are cyclically calling gzp_address_req_send() function until the positive ... (more)

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## Using Gazell on third party chipset

Hello,

I want to create BLE connection between two different modules - nrf51822 and TI CC2564 (possibly Laird BT800). Is there any chance on using Gazell protocol on other devices than Nordic?

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## Gazell nRF51822

Does the s210 softdevice not function on the nRF51822? I see it available for the nRF51422 here but it is listed under the 51422 only.

I have a v1.1.0 PCA10031 (nrf51422) and have written an LED blink example ... (more)

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## gazell out_of_sync and in_sync [closed]

hi ,all

I feel confused about" out_of_sync" and" in_sync" parameters .If a devece is in sync,how the channels was changed ?And what's the use of"nrf_gzll_set_device_channel_selection_policy())"? And how could I get the sync_lifetime in our softcode ?

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## Gazell data lag when more than 1 device is connected

Hi! I am fairly new to programming micro controllers so apologies if I ask many questions. I am using NRF52832. The situation is this - I have 2 devices and 1 host . After receiving data the host then sends data via ... (more)

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## BLE hid keyboard and Gazell at the same time [closed]

Hi there,

My scenario is the split keyboard which has 2 parts: left-hand part and right-hand part. Each part has a NRF52832. I am willing to implement the left-hand part to be a BLE hid keyboard and also connect right-hand ... (more)

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## gazell in more devices application [closed]

hi all:

I am a new user.Now i have a project in which I need to implement a function a host and four devices .I just want to know if i use the example of " gzp_dynamic_pairing " what do i ... (more)

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## Are the pairing information of gzp stored in the flash?

So the question would be if I would need to pair each time the device comes out of reset or are there information stored to return to direct communication without pairing if pairing has been executed once?

And what happens ... (more)

196
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## Frequency hopping with S132 v3

Hello! I'd like to know if S132 v3 implements the frequency hopping scheme defined by BLE.

I've read some documentation on Gazell, but from what I understood, that is a completely different protocol, not a superset of BLE ... (more)

63
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## Gazell example with PCA10028 does not load - does it need softdevice?

I am confused about the lack of softdevice information for the Gazell examples. I am looking at SDK 10 now having first tried SDK12 before deciding to stay with 10.

As a starting point, I have no trouble compling, loading ... (more)

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## GZP (Gazell Pairing Library) causes application to reset into Bootloader

Hello there, thanks so much for taking the time to read. My problem is the following

I am trying to run GZP (Gazell Pairing Library). After successfully pairing with a Gazell Host, if I power cycle my Gazelle device (NRF52 ... (more)

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## Gazell host with multiple devices

I'm new to Gazell, so please excuse the simplicity of my question, but I just seem to be missing something.

I have an application where I will be using one host with two devices. When the host receives a ... (more)

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## How to improve the communication distance with Gazell?

My gazell configuration is as follows:

#define PIPE_NUM                    0
#define TIMESLOT_PERIOD             2000
#define TIMESLOT_PER_CHANNEL        2
#define CHANNEL_TABLE_SIZE          1
#define CHANNEL_TABLE               {18}
#define SYNC_LIFETIME           (3 * CHANNEL_TABLE_SIZE * TIMESLOT_PER_CHANNEL)
#define MAX_TX_ATTEMPTS             3
#define TX_POWER            NRF_GZLL_TX_POWER_4_DBM
#define TX_DATARATE         NRF_GZLL_DATARATE_1MBIT


frames per ... (more)

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## Gazell how to update channel table using num_channel_switches

HI, I look at nRF5 SDK doc about Gazell,see that 'the nrf_gzll_device_tx_info_t contains the num_channel_switches parameter which can be used by application to determine wheather the RF channels are reliable.'But I don't know how to achieve that ... (more)

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## about nrf51 Gazell timeslot period

hi, I test the gazell example gzll_ack_payload in SDK9.0,I found that the default timeslot period is 600us.But after testing using logic analysis,I found sometime transfer interval is600us,but most time it's 1200us. What's the reason?

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I'd like to add a capslock function in gazell when i am developing a keyboard based on 'nrfready_desktop_2_v3.1.0'. After i have read the source code from nordic, i cant found about how to get the RX datas ... (more)

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## Gazell two device cannot suppport ,why?

I use Gazell to acomplish one host --two device.When i just have one device,everything is OK。But when added to two,it cannot work. I think,whether channel of two devices is same cause it ?? So ,for host ... (more)

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## Gazell Ack not received after data transfer

I'm working on a very simple Gazell build - basically the gzll_ack_payload example with some of it pulled out, since I'm working on a board with no LEDs or buttons to run that specific build against. It's a ... (more)

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## nrf51822 Bluetooth and Gazell enabled at same time

Hi Can we have both bluetooth and Gazell enabled at the same time?

We are using nrf51 series chips.

We want Gazell to communicate with with other nrf chips and Bluetooth to communicate with the phone.

Regards Ashwin

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## Gazell Flywheel TIMER2_IRQHandler HardFault

Problem:

We trigger HardFaults reproducibly. By manually unwinding the stack we have traced the source of the error back to the TIMER2_IRQHandler in Gazell. We can see that the TIMER2_IRQHandler reads a callback pointer that sometimes is NULL, but no ... (more)

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## Question of nRF52 + Gazell data rate?

Hi

Befor I used nRF51822 to transmit a packet per 5ms, payload length is 12. I can received 200 packets/s, Initialization settings are as follows

• Device : nRF51822 Gazell Device
• Host : nRF24Lxx Gazell Host
• Softdevice : s110_nrf51822_7.1.0
• library : gzll_arm ...
(more)

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## what is the maximum range to connect 2 NRF51822 devices with Gazell

Hello,

I was looking into Gazell and read that Gazell only allows pairing when Host and Device are in close proximity to each other. This range is about 30 centimeters. I was wondering if this range could be extended? and ... (more)

326
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## Can I run BLE, ANT, and Gazell protocol in the same time on nRF52832?

I wanna plan to design a new hardware which has ability to connect to smartphones using BLE and broadcasting ANT pages in the same time. I also need a way to transmit some private data with the rate of 1 ... (more)

548
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## Gazell, ESB and nRF52 [closed]

Hi all,

Will the Gazell protocol be available on the nRF52, or should I stick to an nRF51?

Also for a new product, is it better to use Gazell than ESB?

Thanks!

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## Gazell, ANT or ..other ?

Hello we would like to use the Nordic chip to send wireless messages from a node to other nodes directly,without hubs. We wouldn't like to be limited to up to 8 nodes receiving the message. All the chain ... (more)

55
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## gazell and app_pwm conflict

Hi,

I'm using gazell library with app_pwm.

From documentation gazell use Timer2 and PPI channels 0,1,2. APP_PWM use Timer0.

When I disable pwm using app_pwm_disable(&PWM1), gazell can't send any packet, but when I enable it ... (more)

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