Re: [beagleboard] Write data to 1-wire eeprom DS2433

[Robert Nelson]

On Tue, Sep 29, 2020 at 6:44 AM 'Johan Lind' via BeagleBoard
<beagl...@googlegroups.com> wrote:
>
> I would need some help to understand why I can't write to an DS2433 eeprom.
>
> System information:
> BBB Industrial board
> Debian 10 (Buster IoT Image 2020-04-06)
> Hardware attached are DS2482 i2c to w1 interface and DS2433 eeprom.
>
> Commands executed:
> $ modprobe ds2482
> $ echo ds2482 0x18 > /sys/bus/i2c/devices/i2c-1/new_device
> $ modprobe wire
>
> I can read the eeprom by executing
> $ cd /sys/bus/w1/devices/23-000002eddd9b
> $ cat eeprom | hexdump
>
> Getting this far I assume hardware is correct and drivers are loaded correctly.
>
> debian@beaglebone:/sys/bus/w1/devices/23-000002eddd9b$ ls
> driver eeprom id name power subsystem uevent
>
> Should here be a directory called w1_slave?
> I see such a directory on some web pages searching for similar problems with w1.
>
> Now to the problem.
> Executing the following command will fail:
> debian@beaglebone:/sys/bus/w1/devices/23-000002eddd9b$ sudo cat /home/debian/file > eeprom
> [sudo] password for debian:
> cat: write error: Invalid argument
>
> To me the error looks like the device doesn't have a write function implemented,
> however looking at the source it looks like it does.
>
> $ dmesg | grep w1
> [2329228.747219] w1_master_driver w1_bus_master1: Attaching one wire slave 23.000002eddd9b crc c8
> [2493821.327176] w1_slave_driver 23-000002eddd9b: invalid offset/count off=0 cnt=140
> [2514308.615437] w1_slave_driver 23-000002eddd9b: invalid offset/count off=0 cnt=140
>
>
> Is there some kind of write protect that needs to be handled?
> Is the w1 system capable of writing to a DS2433 eeprom?
>
> Should I rather try using owfs?

Repost? Please see the old thread here:

https://groups.google.com/g/beagleboard/c/_Xfd9p1Iqc0/m/ZtQW_wACAwAJ

Regards,

--
Robert Nelson
https://rcn-ee.com/