I’m trying use the I2C bus on the BB AI-64.
I installed the overlays for I2C
debian@BeagleBone:/opt/source/dtb-5.10-ti-arm64$ git pull
debian@BeagleBone:/opt/source/dtb-5.10-ti-arm64$ make
debian@BeagleBone:/opt/source/dtb-5.10-ti-arm64$ sudo make install
added the overlays to to extlinux.conf
debian@BeagleBone:/boot/firmware/extlinux$ cat extlinux.conf
label Linux microSD
kernel /Image
append console=ttyS2,115200n8 earlycon=ns16550a,mmio32,0x02800000 root=/dev/mmcblk1p2 ro rootfstype=ext4 rootwait net.ifnames=0
fdtdir /
fdtoverlays /overlays/BONE-I2C1.dtbo /overlays/BONE-I2C2.dtbo
initrd /initrd.img
after reboot I can see that the overlays were loaded
debian@BeagleBone:~$ sudo beagle-version | grep UBOOT
UBOOT: Booted Device-Tree:[k3-j721e-beagleboneai64.dts]
UBOOT: Loaded Overlay:[BONE-I2C1.kernel]
UBOOT: Loaded Overlay:[BONE-I2C2.kernel]
the bone I2C 1 and 2 are present in the /dev
debian@BeagleBone:~$ ls /dev/bone/i2c/
1 2
When I try access the I2C device on the /dev/bone/i2c/1 or /dev/bone/i2c/2 from C code (I’m using the same code and conections as at the Visual Basic | MODBUS.PL which works without problems on BB Black) I’m not able to read/write the I2C device. The timeout error is triggered.
The bone I2Cs are not detected by the i2cdetect.
debian@BeagleBone:/dev/bone$ i2cdetect -l
i2c-3 i2c OMAP I2C adapter I2C adapter
i2c-1 i2c OMAP I2C adapter I2C adapter
i2c-6 i2c OMAP I2C adapter I2C adapter
i2c-4 i2c OMAP I2C adapter I2C adapter
i2c-2 i2c OMAP I2C adapter I2C adapter
i2c-0 i2c OMAP I2C adapter I2C adapter
i2c-5 i2c OMAP I2C adapter I2C adapter
Any ideas?
One more question. What is connected to I2C-2?
debian@BeagleBone:~$ i2cdetect -r 2
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-2 using receive byte commands.
I will probe address range 0x08-0x77.
Continue? [Y/n]
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- --
10: -- -- -- 13 -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- 48 49 4a 4b 4c 4d 4e 4f
50: UU UU 52 53 54 55 56 57 -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --