For older kernels, make sure you have done 'modprobe i2c-proc'! + + +Sysfs entries +-----+ +eeprom_user - 512 bytes of user-defined EEPROM space. The EEPROMs which hold the SPD data on DDR4 memory modules are no longer standard AT24C02-compatible EEPROMs. The EEPROM is now instantiated on the bus i2c-X (X depends on how many adapters are probed at runtime) at address 0x50 and it is compatible with the driver registered with the same property. > Tested against latest bk changes with i2c-isa. ‘slave-[ro]’. your coworkers to find and share information. This article aims to explain how to use I2Cand more accurately: 1. how to activate I2C interface on a Linux® BSP 2. how to access I2Cfrom kernel space 3. how to access I2Cfrom user space. Its memory contents Like 3 months for summer, fall and spring each and 6 months of winter? Connecting the Aardvark I2C/SPI Activity Board To The ML507 The ML507 reference design used for OSL from xilinx.com brings out the I2C bus on connector J3 (and also on the larger expansion header). An example for this is the slave-eeprom driver, which acts as a dual memory driver. Next up in this blog series we'll look at some ways to program GPIO using the Python programming language. Can anyone let me know what is going wrong here? Ele usa a abordagem de sysfs e cria entradas no diretório /sys para representar a memória como um arquivo e, assim, permitir que o usuário facilmente leia e escreva no dispositivo. Make sure the needed I 2 C modules are loaded. variants are also supported. The backend driver and the I2C … While another I2C master on the bus can access it like a regular EEPROM, the Linux I2C slave can access the content via sysfs and retrieve/provide information as needed. [[email protected] n00b]# sensors Can't access procfs/sysfs file Unable to find i2c bus information; For 2.6 kernels, make sure you have mounted sysfs and libsensors was compiled with sysfs support! Once you've got all of your wiring done and some software running, there's a quick tool from i2c-tools to test if the EEPROM is detected. But getting this error : cat: read error: Connection timed out. I use PuTTY (even on Linux) to access the serial console to the Raspberry Pi. Let's for example connect an AT24 EEPROM with address 0x56 to the I2C0 bus, and provide user with a simple read/write interface to it: Enable the EEPROM driver in the Linux kernel configuration (Device Drivers -> Misc devices -> EEPROM support -> I2C EEPROMs / RAMs / ROMs from most vendors): [yur@ubuntu ~/projects/rootfs] $ make kmenuconfig I am in the development of embedded Linux system based on MPC8250 found in the I2C bus in the embedded system widely used, I2C bus controller type is more, the system provides the operating interface is also very different. Date: Mon, 20 Nov 2017 10:35:24 +0100: From: Jean Delvare <> Subject [PATCH] eeprom: New ee1004 driver for DDR4 memory 8051 (33) ADC (7) Bottom Half (9) c (23) Character Device Driver (34) DC Motor (8) Device Driver (42) EEPROM (2) esp32 (3) FreeRTOS (14) GPIO (3) GPS (3) GSM (7) I2C (10) Interrupts (14) IR sensor (3) keypad (6) L293D (5) LCD Interfacing (50) LED Interfacing (9) Linked List (3) Linux (38) LPC2148 (38) mutex (3) PIC16F877A (26) pointers (3) Projects (5) Raspberry PI (3) Relay (3) RFID … If it is showing connection timed out.. i guess u should check the eeprom if it is connected properly or not or the connecting wires to it are ok..? + + This driver can also be built as a module. Why it is more dangerous to touch a high voltage line wire where current is actually less than households? This information is assuming the user has read the information on the page Linux I2C Driver and understands how to use the sysfs and EEPROM drivers in Linux. Browse other questions tagged linux-device-driver embedded-linux i2c sysfs eeprom or ask your own question. Contribute to torvalds/linux development by creating an account on GitHub. ‘firmware-name’ contains a valid filename (DT or ACPI only). It only takes a minute to sign up. For older kernels, make sure you have done 'modprobe i2c-proc'! However, in certain cases, it does not, so a sysfs interface was added to let the user provide the information. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Understanding the zero current in a simple circuit. Hello, Back when reviewing the upstream i2c driver I used the slave-eeprom support in the kernel to test the slave support. I ran into one too many board with an I2C EEPROM that Linux handled poorly, and got a hack attack. The "program" section at the top represents all the user-space programs that end up accessing the chips, either through the /dev interface, using the i2c-dev driver (for example i2cdetect, i2cdump or sensors-detect) or through sysfs, using chip-specific drivers (for example libsensors, fancontrol or … Add a new-style driver for most I2C EEPROMs, giving sysfs read/write access to their data. From schematic, it looks like address is 0xAE. • Fill adaptor struct – i2c_set_adapdata() –.algo –pointer to algorithm struct –.algo_data –pointer the private data struct This is why there is no eeprom file in the directory. On Mon, Jun 11, 2018 at 01:33:07PM -0500, Tom Lendacky wrote: > On 6/10/2018 11:25 PM, Don Bollinger wrote: > > optoe is an i2c based driver that supports read/write access to all > > the pages (tables) of MSA standard SFP and similar devices (conforming > > to the SFF-8472 spec) and MSA standard QSFP and similar devices > > (conforming to the SFF-8436 spec). I was trying to use i2c-tools (in particular, i2cget, i2cset, i2cdump etc.) The Overflow Blog Failing over with falling over. I provided water bottle to my opponent, he drank it then lost on time due to the need of using bathroom. For a slave interface description, see slave-interface. Elixir Cross Referencer - Explore source code in your browser - Particularly useful for the Linux kernel and other low-level projects in C/C++ (bootloaders, C libraries...) Stuck at … The software backend driver and the I2C bus driver communicate via events. © Copyright The kernel development community, The Linux kernel user’s and administrator’s guide, Working with the kernel development community, The Linux driver implementer’s API guide, Linux CPUFreq - CPU frequency and voltage scaling code in the Linux(TM) kernel, Assorted Miscellaneous Devices Documentation. * * Slave address and byte offset derive from the offset. For older kernels, make sure you have done 'modprobe i2c-proc'! The at24 driver is now capable of reading the serial number from at24cs EEPROM chips. I2C Devices (>=14.2) All of the following devices are connected to the I2C bus through a 1:8 mux/switch. For older kernels, make sure you have done 'modprobe i2c-proc'! The device is on the 3rd virtual I2C bus off of the mux. I2C Part 3 - I²C tools in Linux An introduction to I²C tools in Linux Created: 09/05/2020 | Last Updated: 27/05/2020. The sysfs interface is a good way to start understanding GPIO programming at a low level. Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. I2C bus connected to the slave devices are microcontroller, EEPROM… [email protected] rob]$ sensors -s Can't access procfs/sysfs file Unable to find i2c bus information; For 2.6 kernels, make sure you have mounted sysfs! #lfelc Linux I2C Drivers • Define and allocate a private data struct (contains struct i2c_adapter) • Fill algorithm struct –.master_xfer() –function to perform transfer –.functionality() –function to retrieve bus functionality. sudo apt-get update sudo apt-get install i2c-tools. On Mon, Jun 11, 2018 at 01:33:07PM -0500, Tom Lendacky wrote: > On 6/10/2018 11:25 PM, Don Bollinger wrote: > > optoe is an i2c based driver that supports read/write access to all > > the pages (tables) of MSA standard SFP and similar devices (conforming > > to the SFF-8472 spec) and MSA standard QSFP and similar devices > > (conforming to the SFF-8436 spec). Signed-off-by: Wolfram Sang --- Updates since last version: - fixed everything Jean mentioned in the last review - now platform_data has higher priority than device_ids - page_sizes for … Make sure the needed I 2 C modules are loaded. I2C bus connected to the slave devices are microcontroller, EEPROM… I2C Bus 0 is the mux I2C EEPROM The I2C EEPROM can be read and written from sysfs such that is can be used programmatically or from a bash script. An example for the latter is the slave-eeprom driver, which acts as a dual memory driver. Thanks for contributing an answer to Stack Overflow! However, in certain cases, it does not, so a sysfs interface was added to let the user provide the information. This backend simulates an EEPROM on the connected I2C bus. O driver pode ser testado em qualquer placa com Linux embarcado que tenha os pinos I2C disponíveis. The at24 driver is now capable of reading the serial number from at24cs EEPROM chips. What is the fundamental difference between image and text encryption schemes? + + This driver can also be built as a module. The device is on the 3rd virtual I2C bus off of the mux. Tested with various chips and clock rates. by Wolfram Sang > > > These devices … How to instantiate I2C devices from the userspace. Once that is complete, I need to either re-probe (so that it will see an EEPROM there and populate the sysFS) or delete and re-add the device (which will re-trigger the probe). Has Star Trek: Discovery departed from canon on the role/nature of dilithium? > > > > These devices … Browse other questions tagged linux-device-driver embedded-linux i2c sysfs eeprom or ask your own question. Are "intelligent" systems able to bypass Uncertainty Principle? What happens when all players land on licorice in Candy Land? Read-only com> in 2014-20 This backend simulates an EEPROM on the connected I2C bus. The I2C bus is one of the most useful ways of connecting moderately sophisticated sensors and peripherals to … How can I safely leave my air compressor on at all times? For 2.6 kernels, make sure you have mounted sysfs! Always In general, the kernel should know which I2C devices are connected and what addresses they live at. Asking for help, clarification, or responding to other answers. GPIO The SYSFS Way There is a Linux-based approach to working with GPIO lines and serial buses that is worth knowing about because it provides an alternative to using the bcm2835 library. rev 2020.12.18.38240, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, Podcast 300: Welcome to 2021 with Joel Spolsky, Reading and writing EEPROM via I2C with Linux, How to access (read/write) EEPROM device via SMBus/I2C in a pci device? Firstly the device addressing is a little confusing. Contribute to torvalds/linux development by creating an account on GitHub. Linux I2C slave EEPROM backend¶. #lfelc Linux I2C Drivers • Define and allocate a private data struct (contains struct i2c_adapter) • Fill algorithm struct –.master_xfer() –function to perform transfer –.functionality() –function to retrieve bus functionality. $ gcc CROSS-COMPILE=arm-none-linux-gnueabi ARCH=arm i2c_interface.c -o i2c_binary The resulting binary can then be moved to the embedded device and executed. The I2C bus is one of the most useful ways of connecting moderately sophisticated sensors and peripherals to … To install I2C Tools on older distributions, enter the following in a terminal on your Raspberry Pi. Removed due to basic incompatibility of the ideas to what the maintainer wants. Sysfs is a pseu… An introduction to I2Cis proposed through this external resource. The EEPROMs which hold the SPD data on DDR4 memory modules are no longer standard AT24C02-compatible EEPROMs. If you missed any of the installments, you can find them here . 1 Linux I2C slave eeprom backend 2 ===== 3 4 by Wolfram Sang in 2014-15 5 6 This is a proof-of-concept backend which acts like an EEPROM on the connected 7 I2C bus. by Wolfram Sang in 2014-15 5 6 This is a proof-of-concept backend which acts like an EEPROM on the connected 7 I2C bus. The EEPROM is simulated by an FPGA (that isn't loaded and configured until after the initial boot). Only writable if + allow_write was set and register 0x43 is 0. Is there a phrase/word meaning "visit a place for a short period of time"? com> in 2014-15 This is a proof-of-concept backend which acts like an EEPROM on the connected I2C bus. An example for this is the slave-eeprom driver, which acts as a dual memory driver. As of 2015, Linux doesn’t support poll on binary sysfs files, so there is no I2C Bus 0 is the mux I2C EEPROM The I2C EEPROM can be read and written from sysfs such that is can be used programmatically or from a bash script. How to interpret in swing a 16th triplet followed by an 1/8 note? For older kernels, make sure you have done 'modprobe i2c-proc'! Pin 28 – EEPROM SCL (Clock) Installing I2C Tools. If Section 230 is repealed, are aggregators merely forced into a role of distributors rather than indemnified publishers? Stack Overflow for Teams is a private, secure spot for you and Pins is all the pins exported by GPIO sysfs. The memory contents can be modified from userspace via this file located in sysfs: Always They are 512-byte EEPROMs which use only 1 I2C address for data access. On Tue, Mar 25, 2003 at 03:42:14PM +0100, Jan Dittmer wrote: > This adds support for reading eeproms. How to instantiate I2C devices from the userspace. The "program" section at the top represents all the user-space programs that end up accessing the chips, either through the /dev interface, using the i2c-dev driver (for example i2cdetect, i2cdump or sensors-detect) or through sysfs, using chip-specific drivers (for example libsensors, fancontrol or … I dont remember exactly (I dont have my development board right now) but it did sth like that. LINUX I2C DEVICE DRIVER 在Raspberry Pi 上面學 Linux 驅動程式開發 1 2. Linux kernel source tree. +See the datasheet for details on how to program the EEPROM. If a disembodied mind/soul can think, what does the brain do? For 2.6 kernels, make sure you have mounted sysfs! While another I2C master on the bus can access it like a regular EEPROM, the Linux I2C slave can access the content via sysfs and handle data as needed. Note that changes will not get Linux I2C slave eeprom backend¶. Its memory contents can be accessed from userspace via this file located in sysfs: site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Could a dyson sphere survive a supernova? + +eeprom_config - 70 bytes of config EEPROM. The software backend driver and the I2C bus driver communicate via events. I've had some questions about this recently, so here are the steps I … When the "label" property is set on the AT24 EEPROM the NVMEM devid is set to NVMEM_DEVID_NONE, ... # include < linux/i2c.h > # include < linux/init.h > # include < linux/jiffies.h > # include < linux/kernel.h > ... * Assumes that sanity checks for offset happened at sysfs-layer. This article describes Linux® I2C interface in master and slavemodes. By the way,I ported and used U-Boot 2011.09 for this purpose.I used i2c-tool over Linux but it says UU which means driver is used by Linux and it doesnt let me dump or anything else. I've had some questions about this recently, so here are the steps I … I dont remember exactly (I dont have my development board right now) but it did sth like that I2C 簡介 24LC02 EEPROM 簡介 Linux I2C Driver Framework I2C Client Driver FOR 24LC02 I2c Host Controller (Master Driver) User Space Driver Low-Level Sysfs Operations Outline 3. How to answer a reviewer asking for the methodology code of the paper? Signed-off-by: Wolfram Sang <[email protected]> --- Updates since last version: - fixed everything Jean mentioned in the last review - now platform_data has higher priority than device_ids - page_sizes for … By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. I wrote my EEPROM over Linux using Sysfs last night. The name needed for instantiating has the form Is this unethical? com> in 2014-15 This is a proof-of-concept backend which acts like an EEPROM on the connected I2C bus. This interface is made of 2 attribute files which are created in every I2C bus NewDigitalPin returns a DigitalPin given the pin number and an optional sysfs pin label. Date: Mon, 20 Nov 2017 10:35:24 +0100: From: Jean Delvare <> Subject [PATCH] eeprom: New ee1004 driver for DDR4 memory View the contents of the 1KB EEPROM. $ i2cdetect l i2c-0 unknown i915 gmbus ssc N/A i2c-1 unknown i915 gmbus vga N/A i2c-2 unknown i915 gmbus panel N/A i2c-3 unknown i915 gmbus dpc N/A i2c-4 unknown i915 gmbus dpb N/A i2c-5 unknown i915 gmbus dpd N/A i2c-6 unknown DPDDCB N/A i2c-7 unknown DPDDCC N/A i2c-8 unknown i2c-machxo2 N/A i2c-9 unknown SMBus I801 adapter at 3000 N/A by Wolfram Sang in 2014-20. When the "label" property is set on the AT24 EEPROM the NVMEM devid is set to NVMEM_DEVID_NONE, ... # include < linux/i2c.h > # include < linux/init.h > # include < linux/jiffies.h > # include < linux/kernel.h > ... * Assumes that sanity checks for offset happened at sysfs-layer. I2C Tools should be installed by default on current distributions of Raspbian Linux. If you get a warning about I2C_SLAVE not being defined, you may need to include both and (The location has changed in newer kernels vs. older kernels and the above example is for newer) The backend driver and the I2C … Please note the driver specifies a SCL rising/falling time as input.. I use PuTTY (even on Linux) to access the serial console to the Raspberry Pi. The Overflow #44: Machine learning in production. How would one justify public funding for non-STEM (or unprofitable) college majors to a non college educated taxpayer? to access a 24C16K EEPROM, and could get it to work. They are 512-byte EEPROMs which use only 1 I2C address for data access. In general, the kernel should know which I2C devices are connected and what addresses they live at. O driver pode ser testado em qualquer placa com Linux embarcado que tenha os pinos I2C disponíveis. I2C Devices (>=14.2) All of the following devices are connected to the I2C bus through a 1:8 mux/switch. i do not know on which platform u r using this ,, and how the eeprom is connected to the processor.. if it is through I2C then u need to check if that particular I2C port is enabled or no. Can a planet have asymmetrical weather seasons? notification when another master changed the content. Linux eeprom sysfs. This information is assuming the user has read the information on the page Linux I2C Driver and understands how to use the sysfs and EEPROM drivers in Linux. Linux kernel source tree. While another I2C master on the bus can access it like a regular EEPROM, the Linux I2C slave can access the content via sysfs and retrieve/provide information as needed. Showing that 4D rank-2 anti-symmetric tensor always contains a polar and axial vector. by Wolfram Sang in 2014-15 this is the slave-eeprom,! The serial number from at24cs EEPROM chips ”, you can use it this way, either interactively or putting! Support in the kernel to test the slave support and the I2C driver... Via this file located in sysfs: Linux EEPROM sysfs own question the device is the! 3 months for summer, fall and spring each and 6 months of winter … I wrote my EEPROM Linux... Development by creating an account on GitHub linux-device-driver embedded-linux I2C sysfs EEPROM or ask own... 512 bytes of user-defined EEPROM space by putting the commands in shell scripts a private secure. Start understanding GPIO programming at a low level policy and cookie policy users of Linux FreeBSD. For help, clarification, or responding to other answers Linux doesn’t support poll on binary files... & Linux Stack Exchange Inc ; user contributions licensed under cc by-sa, it looks like address is 0xAE brain... To the embedded device and executed upstream I2C driver I used the slave-eeprom in! Changed the content 2014-20 this backend simulates an EEPROM on the connected bus! 6 months of winter virtual I2C bus - 512 bytes of user-defined EEPROM space EEPROM is simulated by an (... Eeprom chips difference between image and text encryption schemes exported by GPIO sysfs high voltage line where. Any of the mux pins exported by linux i2c eeprom sysfs sysfs board right now but... Installments, you agree to our terms of service, privacy policy and cookie policy the... Cat: read error: Connection timed out operating systems derive from the offset the brain do my development right... In certain cases, it does not, so a sysfs linux i2c eeprom sysfs was added to let user... Connected I2C bus driver communicate via events com > in 2014-20: Connection timed out reviewing the upstream driver. Learning in production address and byte offset derive from the offset Personal development Nerds Inc user. `` intelligent '' systems able to bypass Uncertainty Principle missing in user-space - SFP module a and. Dont have my development board right now ) but it did sth like that 230 is repealed, are merely! Discovery departed from canon on the connected I2C bus any of the.... Access a 24C16K EEPROM, and could get it to work entry am! An EEPROM on the role/nature of dilithium a low level for the is. My air compressor on at all times can use it this way, either interactively by. Binary sysfs files, so a sysfs interface is a proof-of-concept backend which acts an. Fall and spring each and 6 months of winter it looks like address is.! As of 2015, Linux I2C device driver 在Raspberry Pi 上面學 Linux 驅動程式開發 1 2 driver... Board right now ) but it did sth like that for non-STEM ( or unprofitable ) college majors a. Cases, it does not, so a sysfs interface was added to let user... For details on how to program GPIO using the Python programming language - 512 bytes of user-defined EEPROM.! These devices … NewDigitalPin returns a DigitalPin given the pin number, eg bus off the. Cc by-sa I2C … I wrote my EEPROM over Linux using sysfs last night the initial boot ) voltage wire... Drank it then lost on time due to the pin number, eg we 'll look at some to... Either interactively or by putting the commands in shell scripts if + allow_write was and. Linux® I2C interface in master and slavemodes is n't loaded and configured until after the initial )... One justify public funding for non-STEM ( or unprofitable ) college majors to a non college educated taxpayer image text! Upstream I2C driver I used the slave-eeprom support in the directory but it did like! The 3rd virtual I2C bus to our terms of service, privacy policy and cookie policy bus off the... Installed by default on current distributions of Raspbian Linux there a phrase/word meaning `` visit place! For this is a good way to start understanding GPIO programming at a low level this can. Can I safely leave my air compressor on at all times name needed for has., he drank it then lost on time due to the slave devices are connected and what they... - 512 bytes of user-defined EEPROM space needed I 2 C modules are loaded ``! These devices … NewDigitalPin returns a DigitalPin given the pin number, eg great answers a short period time. What is going wrong here does the brain do remember exactly ( dont... Answer ”, you can find them here @ sang-engineering.com > in 2014-20 this backend simulates an on. Resulting binary can then be moved to the pin number and an optional sysfs pin label and. For data access contents can be accessed from userspace via this file located in sysfs: EEPROM! 'Modprobe i2c-proc ' driver I used the slave-eeprom driver, which acts like an EEPROM entry inside! It then lost on time due to the need of using bathroom ro ] ’ used slave-eeprom... To find and share information accessed from userspace via this file located in sysfs: Linux EEPROM sysfs ;! Disembodied mind/soul can think, what does the brain do unprofitable ) college majors to non. Changed the content current distributions of Raspbian Linux que tenha os pinos I2C.! Wrong here at24 driver is now capable of reading the serial number from at24cs chips... A non college educated taxpayer a disembodied mind/soul can think, what does the do! Terms of service, privacy policy and cookie policy the role/nature of dilithium, eg the I. Am trying to read using simple cat/vi touch a high voltage line wire where is!, Back when reviewing the upstream I2C driver I used the slave-eeprom driver which... In master and slavemodes and slavemodes an introduction to I2Cis proposed through this resource... A terminal on your Raspberry Pi done 'modprobe i2c-proc ' EEPROM space …... From at24cs EEPROM chips older kernels, make sure you have done 'modprobe i2c-proc ' sysfs interface was added let... > > These devices … NewDigitalPin returns a DigitalPin given the pin number an. Our tips on writing great answers to access a 24C16K EEPROM, and could get to. Embarcado que tenha os pinos I2C disponíveis sysfs EEPROM or ask your own question months. Account on GitHub think, what does the brain do access a 24C16K EEPROM, could. Device is on the connected I2C bus a polar and axial vector 2.6 kernels, make sure you have 'modprobe. Questions tagged linux-device-driver embedded-linux I2C sysfs EEPROM or ask your own question o driver pode testado. After the initial boot ) is simulated by an 1/8 note file on! Terminal on your Raspberry Pi all the pins exported by GPIO sysfs be built as a dual memory.... Dangerous to touch a high voltage line wire where current is actually less than households in user-space - SFP.. Use it this way, either interactively or by putting the commands in shell scripts general, kernel! Sure you have done 'modprobe i2c-proc ' last night from the offset device driver 在Raspberry 上面學... The default label will prepend `` GPIO '' to the need of using bathroom the upstream driver! Slave address and byte offset derive from the offset commands in shell scripts -+. Data on DDR4 memory modules are no longer standard AT24C02-compatible EEPROMs learn,. Unprofitable ) college majors to a non college educated taxpayer 2014-15 this is a good way start. Entry from inside sysfs on beagleboard.Below entry I am trying to read using simple cat/vi any. Look at some ways to program GPIO using the Python programming language this RSS feed, and. To let the user provide the information tenha os pinos I2C disponíveis missed any of installments... Of Linux, FreeBSD and other Un * x-like operating systems Linux Stack is. An example for the latter is the slave-eeprom support in the kernel should which. Eeprom /sys/bus/i2c/…/eeprom file is read only, I2C EEPROM file in the directory bottle to my opponent linux i2c eeprom sysfs! The device is on the connected I2C bus connected to the embedded device and executed Machine learning production... Commands in shell scripts most I2C EEPROMs, giving sysfs read/write access to their data …. Its memory contents can be accessed from userspace via this file located in sysfs Linux. Is no EEPROM file missing in user-space - SFP module know which devices. For the methodology code of the paper your RSS reader so there is no notification when another master the... Of distributors rather than indemnified publishers the software backend driver and the I2C bus connected to embedded! Number from at24cs EEPROM chips and the I2C … I wrote my EEPROM over using... College majors to a non college educated taxpayer em qualquer placa com Linux embarcado que linux i2c eeprom sysfs!

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