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I2C Detect Slave Method?

  • administrators

    @UFD we fixed the driver for the hardware I2C controller. The main enhancements are:

    • The i2cdetect command is now supported
    • clock stretching is supported
    • support for unlimited message length
    • support for repeated start sequences

    Check out this blog post for more details

  • @Lazar-Demin, Awesome news, thanks for letting me know. I will test very soon.

  • @Lazar-Demin Dear,
    Thank you for your support, but Clock stretching is not clear; i.e how to change clock for i2c, in my case it is 100 kHz and I wan to chage it
    what are the instructions for that,
    thank you in all cases.

  • administrators

    @Ammar-Assad the underlying driver supports clock stretching and will do so automatically, you don't have to specifically configure it.
    As far as I remember, the Omega2 should support all I2C devices running from 100 kHz to 400 kHz out of the box.

  • @Lazar-Demin
    Acutally I have upgraded my omega for that, it is still unclear for me how to controll clock speed, it is alway 100 kHz, the device is MPU9250

  • @Ammar-Assad Omega2(+)'s SCL clock frequency is 100kHz by default. According to its datasheet it's good for an MPU9250 slave.
    Do you want a slower (eg. 10kHz) or a faster (eg. 400kHz) bus?
    What is your real problem?

    @Ammar-Assad wrote

    it is still unclear for me how to controll clock speed, it is alway 100 kHz

    Clock stretching is not clear; i.e how to change clock for i2c, in my case it is 100 kHz and I wan to chage it

    As you know the original I2C communication speed (I2C Standard mode) was defined with a maximum of 100 kbit per second and the SCL clock is always determined / generated by the I2C master.
    The clock stretching is a completely different thing.

  • @György-Farkas Thanks for your concern, Actually I want to faster it if it is possible.

  • @Ammar-Assad
    MediaTek MT7688 Datasheet
    5.10 I2C Controller
    Module name: I2C Base address: (+10000900h)
    bit 27:16 SM0_CLK_DIV SIF master 0 clock divide value
    This is used to set the divider to generate expected SCL.

    • Omega2(+) default 100kHz
      40MHz / 400 = 100kHz
      400 = 0x190
    devmem 0x10000940
    • set to 400kHz
      40MHz / 100 = 400kHz
      100 = 0x64
    devmem 0x10000940 32 0x8064800F
    devmem 0x10000940

    Good luck!

  • @György-Farkas said in I2C Detect Slave Method?:


    Ooops! devmem not found unfortunately !

  • @Ammar-Assad Here you are a quick 'proof-of-concept' with a "full" BusyBox.

    # Omega2+
    root@Omega-99A5:/# oupgrade -v
    > Device Firmware Version: 0.2.2 b200
    root@Omega-99A5:/# cd ~
    root@Omega-99A5:~# wget https://www.busybox.net/downloads/binaries/1.28.1-defconfig-multiarch/busybox-mipsel
    root@Omega-99A5:~# chmod +x busybox-mipsel
    root@Omega-99A5:~# ./busybox-mipsel
    BusyBox v1.28.1 (2018-02-15 14:34:02 CET) multi-call binary.
    BusyBox is copyrighted by many authors between 1998-2015.
    Licensed under GPLv2. See source distribution for detailed
    copyright notices.
    Usage: busybox [function [arguments]...]
       or: busybox --list[-full]
       or: busybox --install [-s] [DIR]
       or: function [arguments]...
    	BusyBox is a multi-call binary that combines many common Unix
    	utilities into a single executable.  Most people will create a
    	link to busybox for each function they wish to use and BusyBox
    	will act like whatever it was invoked as.
    Currently defined functions:
    	[, [[, acpid, add-shell, addgroup, adduser, adjtimex, arch, arp, arping, ash, awk, base64, basename, beep, blkdiscard, blkid,
    	blockdev, bootchartd, brctl, bunzip2, bzcat, bzip2, cal, cat, chat, chattr, chgrp, chmod, chown, chpasswd, chpst, chroot,
    	chrt, chvt, cksum, clear, cmp, comm, conspy, cp, cpio, crond, crontab, cryptpw, cttyhack, cut, date, dc, dd, deallocvt,
    	delgroup, deluser, depmod, devmem, df, dhcprelay, diff, dirname, dmesg, dnsd, dnsdomainname, dos2unix, dpkg, dpkg-deb, du,
    	dumpkmap, dumpleases, echo, ed, egrep, eject, env, envdir, envuidgid, ether-wake, expand, expr, factor, fakeidentd, fallocate,
    	false, fatattr, fbset, fbsplash, fdflush, fdformat, fdisk, fgconsole, fgrep, find, findfs, flock, fold, free, freeramdisk,
    	fsck, fsck.minix, fsfreeze, fstrim, fsync, ftpd, ftpget, ftpput, fuser, getopt, getty, grep, groups, gunzip, gzip, halt, hd,
    	hdparm, head, hexdump, hexedit, hostid, hostname, httpd, hush, hwclock, i2cdetect, i2cdump, i2cget, i2cset, id, ifconfig,
    	ifdown, ifenslave, ifplugd, ifup, inetd, init, insmod, install, ionice, iostat, ip, ipaddr, ipcalc, ipcrm, ipcs, iplink,
    	ipneigh, iproute, iprule, iptunnel, kbd_mode, kill, killall, killall5, klogd, last, less, link, linux32, linux64, linuxrc, ln,
    	loadfont, loadkmap, logger, login, logname, logread, losetup, lpd, lpq, lpr, ls, lsattr, lsmod, lsof, lspci, lsscsi, lsusb,
    	lzcat, lzma, lzop, makedevs, makemime, man, md5sum, mdev, mesg, microcom, mkdir, mkdosfs, mke2fs, mkfifo, mkfs.ext2,
    	mkfs.minix, mkfs.vfat, mknod, mkpasswd, mkswap, mktemp, modinfo, modprobe, more, mount, mountpoint, mpstat, mt, mv, nameif,
    	nanddump, nandwrite, nbd-client, nc, netstat, nice, nl, nmeter, nohup, nproc, nsenter, nslookup, ntpd, nuke, od, openvt,
    	partprobe, passwd, paste, patch, pgrep, pidof, ping, ping6, pipe_progress, pivot_root, pkill, pmap, popmaildir, poweroff,
    	powertop, printenv, printf, ps, pscan, pstree, pwd, pwdx, raidautorun, rdate, rdev, readahead, readlink, readprofile,
    	realpath, reboot, reformime, remove-shell, renice, reset, resize, resume, rev, rm, rmdir, rmmod, route, rpm, rpm2cpio,
    	rtcwake, run-init, run-parts, runlevel, runsv, runsvdir, rx, script, scriptreplay, sed, sendmail, seq, setarch, setconsole,
    	setfattr, setfont, setkeycodes, setlogcons, setpriv, setserial, setsid, setuidgid, sh, sha1sum, sha256sum, sha3sum, sha512sum,
    	showkey, shred, shuf, slattach, sleep, smemcap, softlimit, sort, split, ssl_client, start-stop-daemon, stat, strings, stty,
    	su, sulogin, sum, sv, svc, svlogd, swapoff, swapon, switch_root, sync, sysctl, syslogd, tac, tail, tar, taskset, tcpsvd, tee,
    	telnet, telnetd, test, tftp, tftpd, time, timeout, top, touch, tr, traceroute, traceroute6, true, truncate, tty, ttysize,
    	tunctl, ubiattach, ubidetach, ubimkvol, ubirename, ubirmvol, ubirsvol, ubiupdatevol, udhcpc, udhcpd, udpsvd, uevent, umount,
    	uname, unexpand, uniq, unix2dos, unlink, unlzma, unshare, unxz, unzip, uptime, users, usleep, uudecode, uuencode, vconfig, vi,
    	vlock, volname, w, wall, watch, watchdog, wc, wget, which, who, whoami, whois, xargs, xxd, xz, xzcat, yes, zcat, zcip
    root@Omega-99A5:~# ./busybox-mipsel devmem 0x10000940
    root@Omega-99A5:~# ./busybox-mipsel devmem 0x10000940 32 0x8064800F
    root@Omega-99A5:~# ./busybox-mipsel devmem 0x10000940

    FW 0.2.2 b200 - presently the divider is '0x18F = 399' instead of '0x190 = 400'.
    Please ask one of Onion administrators ( @Zheng-Han @Lazar-Demin @Pavel-Metrokhin) why 😉

  • @György-Farkas said in I2C Detect Slave Method?:

    ./busybox-mipsel devmem 0x10000940 32 0x8064800F

    I am very grateful to you, it worked fine ... ♥

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