# 83 questions

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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

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)

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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)

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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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2

## 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)

275
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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)

292
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1

## 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)

485
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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!

502
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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)

48
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1

## 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)

125
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## What's the maximum transmission speed using Gazell in nRf51 series

I notice that Gazell could only send 32 bytes per Payload in nRf51 series. So i wanted to know what can be the maximum speed i can attain using that payload.

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Hello,

We use Gazell for RF application as follow: - TX 4dbM - RX 250kbps - 2m distance - 1Hz packet frequency

we observe that RSSI reduce significantly as soon as we add our hand between transmitter and receiver and then seems to auto ... (more)

1k
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Hi,

I want to use more than 8 devices with gazelle protocol, so is there any way to expand the pipe number or change the pipe addresses in runtime ? Host device will know which device is going to be available ... (more)

152
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Hi,

I'm trying to set up a link between one master and 10~ slave devices. All I need is a lowest latency and little data rate for short time.

And there is my question :

1. What are the minimal connection ...
(more)

123
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## FreeRTOS with Gazell problem on nrf51

Hi All,

We have been developing device with pca10028 evaluation board and in the process we use also few other custom boards with nrf51822. We use IAR. The device system is based on FreeRTOS, contains SPI controlled lcd display, the ... (more)

213
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1

## Gazell OR BLE Multilink Central?

I have gone through the SDK and from what i basically understand is that gazell and BLE Multilink look very similar from the application point of view(1 Host connecting to 8 devices).

Can anyone please tell what is the ... (more)

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## NRF51822: Gazell error when performing write operation to external FLASH

We are facing a problem of Gazell failure (not getting interrupt on gazell ISR) when i perform external Flash write using SPI.

If i disable gazell and write data to flash, and then enable gazell after flash ... (more)

563
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## BLE & Gazell protocol stack wizard in Sweden?

Looking for someone that has previous experience building multi protocol / time slot topologies using a mix of BLE (central+peripheral) & custom Gazell connections running concurrently.

Preferably someone in Sweden but road-warrior work could also be interesting!

Thanks David

496
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2

## Gazell frame rate too low? [closed]

I have continued to build upon the Nordic sdk10:gzll_ack_payload example using gcc-4.9-2015q1 on Linux. The differences are:

• added UART for debugging (running at 460800 BAUD)
• running on pca10031 (Nordic usb dongle) instead of pca10028 ...
(more)

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## Recent blog posts

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