Why _10-bit I2C Slave Addressing_ is not widely used in device libraries and example codes? Even, I

Why 10-bit I2C Slave Addressing is not widely used in device libraries and example codes? Even, I often use a 7-bit slave address. It seems to me that either 10-bit addressing is only for special cases or it's a bit of a challenge to implement in code. Appreciate any perspective, experience @abhishek awasthi @Navadeep @ShreeshaN @Aditya thakekar

Ttechielew By “when the code runs” do you mean encrypt the binary?

brotherjoons•1/18/24, 6:11 AM

Hi @techielew , encrypt the .py source code or .pyc compiled code and decrypt them on the fly so the Python interpreter could run it.
I was curious about the best practices in doing so. Thanks

DevHeads•1/18/24, 6:11 AM

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UUmesh Lokhande Why _10-bit I2C Slave Addressing_ is not widely used in device libraries and exa...

ShreeshaN•1/18/24, 6:14 AM

My guess is that use of 8-bit or 10-bit slave address will add a byte more in every communication packet of data and considering slow speed of I2C, devices using 8-bit or 10-bit are not popular and adding extra implementation of addressing will increase I2C device library for small microcontrollers.

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Hermes•1/18/24, 6:22 AM

I'm a cybersecurity student at National University, and previously was an intern at tinyvision.ai inc. (the company that made the Upduino v3 ice40 FPGA dev board)

SShreeshaN My guess is that use of 8-bit or 10-bit slave address will add a byte more in ev...

Umesh LokhandeOP•1/18/24, 6:31 AM

I agree though. Not sure who will love this 10-bit addressing and implementation. I wonder even for MPU users are there enough bus drivers support for 10-bit I2C addresses in user space packages

Bbrotherjoons Hi @techielew , encrypt the .py source code or .pyc compiled code and decrypt th...

techielew•1/18/24, 6:42 AM

Is this for a commercial project? How imperative is it that either the source or the binary are encrypted? What are you concerned about protecting against? IP theft/cloning? Vulnerabilities? Something else?

There are commercial products like IAR Embedded Trust that provide application encryption and other security measures. And other services that encrypt binaries. Of course, those aren't FOSS..

Ttechielew Is this for a commercial project? How imperative is it that either the source or...

techielew•1/18/24, 6:42 AM

https://www.iar.com/embeddedtrust

IAR Embedded Trust

Simplify embedded security with the Root of Trust;

Secure code, applications and devices

UUmesh Lokhande Why _10-bit I2C Slave Addressing_ is not widely used in device libraries and exa...

Aditya thakekar•1/18/24, 6:56 AM

Most mcu work on the assumption that slave disables itself on not receiving matching address. 10 bit is used in STM32 series but not all support. NACK is disabled function.

Ttechielew @Joseph Ogbonna @Umesh Lokhande

Padmalaya Rawal•1/18/24, 7:11 AM

Thank you @Joseph Ogbonna @techielew
@ShreeshaN helped me out

SShreeshaN My guess is that use of 8-bit or 10-bit slave address will add a byte more in ev...

Navadeep•1/18/24, 7:26 AM

Makes sense. As well, 10-bit one can address upto (2^10)-1 devices. But come on, I haven't seen anyone using even 127 device itself on a single bus.

Navadeep•1/18/24, 7:28 AM

Curious: What was your highest? I've used 8 of them multiplexed with the same address and 8 such ones in a single bus. In SPI though I've seen designs having 64 subordinate nodes.

Aditya thakekar•1/18/24, 7:30 AM

Yes that's another... Haven't seen that high of a bus load either

Navadeep•1/18/24, 7:32 AM

https://www.i2c-bus.org/i2c-primer/common-problems/

NNavadeep https://www.i2c-bus.org/i2c-primer/common-problems/

Aditya thakekar•1/18/24, 7:44 AM

Saßì•1/18/24, 8:29 AM

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V_____K•1/18/24, 9:06 AM

i am an embedded system developer, i work on designing hardware as well as firmware

LMtx•1/18/24, 10:03 AM

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Hi!

Kklug Hi!

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Hi welcome

Phoenix•1/18/24, 10:12 AM

please introduce your self, feel free to share your background and what you're working on

klug•1/18/24, 10:30 AM

Hi!
I am embedded linux developer as well as hardware hacker. I am currently a student doing my undergrads from india. I am currently learning rust for embedded and aiming to build projects with rust only. Willing to collaborate and share ideas as well as learn stuff

Kklug Hi! I am embedded linux developer as well as hardware hacker. I am currently a s...

nour_oud•1/18/24, 10:33 AM

Welcome to the server! Happy to have you as a DevHead!

LLMtx If you could ask the head manager of the Electronics, Computer Sciences, and Emb...

nour_oud•1/18/24, 10:38 AM

The question will be: " Quelles initiatives ou stratégies le département entreprend-il actuellement pour rester à l'avant-garde des technologies émergentes et garantir que les étudiants soient bien équipés des compétences et des connaissances nécessaires pour les domaines en constante évolution de l'électronique, des sciences informatiques et des systèmes embarqués ? " lol

Nnour_oud The question will be: " Quelles initiatives ou stratégies le département entrepr...

LMtx•1/18/24, 10:39 AM

Google saved me once again

That is a great question (and I've already got it on my agenda

)

UUmesh Lokhande I agree though. Not sure who will love this 10-bit addressing and implementation...

Aditya thakekar•1/18/24, 11:04 AM

Had made this linkedin post on i2c multiplexing.

https://www.linkedin.com/posts/adityathakekar_embeddedsystems-iot-esp32-activity-7143202129975959552-xX7o?utm_source=share&utm_medium=member_android

Aditya Thakekar on LinkedIn: #embeddedsystems #iot #esp32 #sensors ...

Mastering I2C Multiplexing on ESP32 with BMP280 Sensors

The Challenge:
Ever tried connecting multiple BMP280 barometric sensors to an ESP32 for a… | 14 comments on LinkedIn

AAditya thakekar Had made this linkedin post on i2c multiplexing. https://www.linkedin.com/posts...

nour_oud•1/18/24, 11:17 AM

Good information

Aditya thakekar•1/18/24, 11:20 AM

Thanks

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Welcome @asper ! Can you tell us a little about yourself and your technical background?

asper•1/18/24, 1:00 PM

Hi, I am asper, I work at a space tech startup as an embedded systems engineer. Have been passionate about hardware since i was a kid. I am an aeromodeller and love systems engineering.

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That's great! @asper Can you share a bit about the projects you've undertaken in the past or any current projects you're working on?

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Hii

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SD•1/18/24, 2:09 PM

"I am an IoT and IIoT developer

kristof-at-embeetle•1/18/24, 2:18 PM

Hi guys,
I'm using the following PTC fuse to protect the Tiny Scarab board (and the PC you're plugging it in):

kristof-at-embeetle•1/18/24, 2:18 PM

kristof-at-embeetle•1/18/24, 2:18 PM

The part number is

0402L050SL

0402L050SL

kristof-at-embeetle•1/18/24, 2:19 PM

It's a PTC resettable fuse that can hold 500 mA. As per the USB standard, that should be fine. The PC should be able to deliver 500 mA on each USB port without damaging itself.

kristof-at-embeetle•1/18/24, 2:19 PM

However, I'm a bit worried about two things:

kristof-at-embeetle•1/18/24, 2:21 PM

1) The

0402L050SL

0402L050SL

will trip only at 1A. In other words, the trip current is twice as high as the hold current. Isn't that a bit dangerous for the PC?

2) The

0402L050SL

0402L050SL

has a R_min of

0.040 Ohm

0.040 Ohm

. That looks okay. However, the

R1_max

R1_max

0.400 Ohm

0.400 Ohm

. The datasheet says: R 1max = Maximum resistance of device at 20°C measured one hour after tripping or reflow soldering of 260°C for 20 sec. Could this be a problem?

kristof-at-embeetle•1/18/24, 2:22 PM

PS: please feel free to suggest another PTC fuse with better characteristics

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Kkristof-at-embeetle Click to see attachment

nour_oud•1/18/24, 3:13 PM

I'm not a hardware expert, but based on the specifications you provided for the 0402L050SL, it appears to be suitable for protecting the Tiny Scarab board and the PC .