how to transfer data from nRF52840DK to raspberry pi 4 without deploying bluetooth ble5 ?

RE: how to transfer data from nRF52840DK to raspberry pi 4 without deploying bluetooth ble5 ?

NRF52840DK&dev — Fri, 04 Feb 2022 09:11:47 GMT

in this moment , we can close it , because i can not find the new raspberry pi 4 that being available to ship me , all are sold out ,so i could not test SPI communication between both devices i have only nRF52840DK in my hand , and i do not want to buy used or refurbish raspberry pi4 , i want to buy new one , and adafruit raspberry pi 4 distributor will be ready to ship it again ,problably the end of March , once i got raspberry pi 4 ,maybe the end of March ,and start having problem of sending data with SPI between 1 raspberry pi4 and 5 nRF52840DK or i could not configure coding of 5 SPI instance communication , i will ask again by open new ticket

RE: how to transfer data from nRF52840DK to raspberry pi 4 without deploying bluetooth ble5 ?

Simonr — Thu, 03 Feb 2022 12:55:14 GMT

Let me know if we can close this case now, or if you have (or might have) follow up questions we can leave it open for now.

Best regards,

Simon

RE: how to transfer data from nRF52840DK to raspberry pi 4 without deploying bluetooth ble5 ?

NRF52840DK&dev — Thu, 03 Feb 2022 10:25:33 GMT

very thanks

RE: how to transfer data from nRF52840DK to raspberry pi 4 without deploying bluetooth ble5 ?

Simonr — Wed, 02 Feb 2022 13:15:49 GMT

1. I would go ahead with SPI if I were you, but would keep this in mind, and make sure to do thorough testing to make sure it works as intended.

2. Yes.

Best regards,

Simon

RE: how to transfer data from nRF52840DK to raspberry pi 4 without deploying bluetooth ble5 ?

NRF52840DK&dev — Wed, 02 Feb 2022 09:40:05 GMT

1. if in my case , need the length of cable 120 cm , how to figure out ? still deploying SPI or other way , please recommend me

2. thanks , for the second answer , both board ( raspberry pi 4 and nRF52840dk . will be able to speak together with SPI even though raspberry pi4 deploys nodejs and nRF52840dk deploys c/c++

RE: how to transfer data from nRF52840DK to raspberry pi 4 without deploying bluetooth ble5 ?

Simonr — Tue, 01 Feb 2022 11:36:46 GMT

1. In all these cabled instances it's recommended to keep the wires as short and simple as possible. Will you not be able to use wires shorter than what's recommended?

2. Yes, no matter what language two devices using SPI are programmed in, the SPI peripheral won't care what language they both "speak" as it will just transfer data from one end to the other, and then each device handles that data so that it's readable on that side. One device being C/C++ and one being nodejs shouldn't have anything to say.

Best regards,

Simon

RE: how to transfer data from nRF52840DK to raspberry pi 4 without deploying bluetooth ble5 ?

NRF52840DK&dev — Mon, 31 Jan 2022 10:50:15 GMT

very thanks

i have 2 questions below

question 1 --->except SPI , with the condition for the length of wire /cable 120 cm , ---> are there other way to send data with lesser loss or without loss ( for example such as UART or I2C or other way ) ?

question 2 as you said , the nRF52810DK will act as slave , for programming , once sending the data by the slave configuration of MISO ,MOSI SCLK, MOSI, CS pin to send or communicate/exchange data with the raspberry pi4

on the side of nRF52840DK , i will have to use segger embed studio with c/c++ for programming

however, instead to program with python or c/c++ on the side of raspberry pi4 that needs to receive or communicate /exchange data from nRF52840Dk , so --> Will i be able to use or deploy Nodejs to program the raspberry pi4 in order to be able to read the data that has been sent from nRF52840DK with SPI communication ?? Nodejs - SPI link and nodejs - SPI device * note; i am new for c/c++ or python because i am app/ web developer , i ask question 2 because it deploys different method / different programming language to communicate data each other instead of using the c/c++ as the side of nRF52840DK , i want to know if i program the raspbeery pi 4 with nodejs as the nodejs - SPI documentation on this link Nodejs - SPI link and nodejs - SPI device , then ---> the raspberry pi4 will be able to read the data that has been sent from nRF52840dk with the slave configuration of MISO ,MOSI SCLK, MOSI, CS pin from the nRF5284DK documentation and Sumair youtube video or not ?

please let me know this question 2 as well

RE: how to transfer data from nRF52840DK to raspberry pi 4 without deploying bluetooth ble5 ?

Simonr — Mon, 31 Jan 2022 08:53:18 GMT

1. The rule of thumb when it comes to length between wired connections is to "keep it short and simple", or KISS for short. I would strongly recommend trying to find shorter wires than 120cm, and preferably as short as possible, as that will minimize the chances for lost data. It will likely work with 120cm I would think, but by getting shorter wires you will likely save yourself from lost data packets and retransmissions.

2. Indeed, their product page does not say much on how many peripherals/instances they have, but from what I can find (here for example) it seems to have 7 SPI instances. To make sure I would suggest contacting either Raspberry Pi or a distributor that would know for sure.

Best regards,

Simon

RE: how to transfer data from nRF52840DK to raspberry pi 4 without deploying bluetooth ble5 ?

NRF52840DK&dev — Sat, 29 Jan 2022 07:29:11 GMT

very thanks from your answer

about the raspberry pi 4 multiple spi is the good choice as your link , however i do not have it in my hand now ,cause the raspbery pi 4 sold out from online store from official raspberry pi 4 website

question 1 . --> my case after watching the youtube video from sumair 's tutorial , he said , the wire cable max length should be not over 3 feet (90 cm) **** my case is 120 - 150 cm or 4 - 5 feet max length , is it still ok with the length 4 - 5 feet -->between raspberry pi and nRF52840dk ??

question 2 --> https://www.adafruit.com/product/4292 ---> regarding to this link , i am not sure . i do not know the raspberry pi 4 model B 2 GB as you see in this link , it will be RASPBERRY PI 4 MULTIPLE SPIs that has 7 SPIs as your previous answer or not ??

RE: how to transfer data from nRF52840DK to raspberry pi 4 without deploying bluetooth ble5 ?

Simonr — Fri, 28 Jan 2022 08:55:18 GMT

Hi again

1. Yes, I would recommend the nRFs acting as slaves and the Raspberry as the master.

2. You should make sure that the Raspberry has enough SPI instances though, or else it won't be able to communicate with all five nRF52 DKs at the same time. From what I can see here, this won't be a problem as it seems to have 7(!) SPI instances SPI0-SPI6. Each DK should be connected to its own set of GPIOs that are configured to one SPI instance each.

3. Sumair's tutorial videos are pretty good, and I see that he has a part 36 B going deeper into how using SPI communication here. We don't have much official tutorials on basic SPI projects, as the SPI slave example and driver documentation should be sufficient.

Best regards,

Simon

RE: how to transfer data from nRF52840DK to raspberry pi 4 without deploying bluetooth ble5 ?

NRF52840DK&dev — Thu, 27 Jan 2022 18:17:28 GMT

thanks ,

after getting your answer , i did research on the internet , about the method to send data between I2C or UART or SPI , i found that the SPI is the best way in order to send data .

SPI is superior in speed compared to I2C. Its push-pull drivers offer enhanced speed and signal integrity and its full-duplex support means master and slave devices can send data at the same time, allowing for even quicker data exchanges. While SPI has a speed advantage, it is more difficult and costlier to add multiple slave devices to the bus. This is because each slave needs its own slave select line, so the number of wires needed to communicate increases with each device.

i found the youtube video about how to learn SPI data transferring

https://www.youtube.com/watch?v=RRUH_VHNocU&list=PLiKJljyEUlZj4z8RqJKTaoMpSqjLdBGO4&index=40

however my case need to send data from ( 5 units of nRF52840DK ) to ( one of raspberry pi 4 )

i have 3 questions below to ask you

question 1 ---> i think in term of master and slave , my 5 nrf52840dk should be as 5 slaves and my one master is one raspberry pi 4 , am i understanding correctly ?

question 2 ---> is it still ok to send data with SPI ** IN MY CASE ** that need to send data from 5 nrf52840dk to one raspberry pi 4 ?? or need to use other way as uart or i2c instead ?

question 3 ---> regarding to the learning spi video from youtube , do you have other guideline video that teach how to deploy spi of nrf52840dk ?

RE: how to transfer data from nRF52840DK to raspberry pi 4 without deploying bluetooth ble5 ?

Simonr — Thu, 27 Jan 2022 13:33:35 GMT

On the Raspberry Pi side of things you'll have to find code yourself, but on the nRF side we do indeed have for example UART and SPI that can help you transmit data over a wired connection. From your previous cases I assume you're looking at using the nRF5 SDK, so here are some links to the UART and SPI peripheral example projects from the nRF5 SDK. It's up to you which one you'd like to use, but the SPI would allow for the highest throughput.

Best regards,

Simon