I have also suspected in gpio pull-up/pull-down, but it seems to be OK . i2c operations : root@ratech82_cwet_rgk_kk:/ # i2cset -f -y 1 0x20 0x0f 0x00 Had the same problem myself, since most of the examples out there were for RPi r1. I tried disabling the i2c-mux overlay and setting the mux directly. 4. i2cget is a small helper program to read registers visible through the I2C bus (or SMBus). Revision 2 of RPi moved the i2c-0 pins to the P5 bank. MIO55 - SDA . It is pullup by default: MIO54 - SCL. The old i2c … Because all the standard Device Tree Blobs seem to directly support the Cyclone V SOC board, the I2C slaves in your device tree are probably the ones for that board and not the SocKit. root@raspberrypi:~# i2cset -y 1 0x18 0x05 Error: Write failed root@raspberrypi:~# i2cget -y 1 0x18 0x05 w Error: Read failed root@raspberrypi:~# i2cget -y 1 0x18 0x05 b Error: Read failed root@raspberrypi:~# i2cget -y 1 0x18 0x05 i Error: Invalid mode! Based on above, when i try to read a simple RW register using the command. First we need to install the i2c-tools package to read the temperature sensor with: sudo apt-get install i2c-tools. Shyam But we can see from the oscilloscope , the ninth bit ACK did not pull low . root@VP88x_2017_3_PRJ0191:/mnt# devmem 0xFF18017C 0x03FFFFFF If i try to i2cget through RTC i2cget: read failed: Connection timed out. The problem is that it only sends 1 byte of data. By default, i2cget will wait for a confirmation from the user before messing with the I2C bus. There is, however, an EEPROM at address 0x51 on the Cyclone V SOC Development Board. i2cget -y 1 0x68 0x00 -y Disable interactive mode. so that we can't see the wave of 0x00 ,the i2c get Read failed. Then, run this command with values of Table 1. I can't send more than that. It is well possible, that devices which are read-able fails to return data when (default) i2cdump command is run. Also i tried the same read operation on different registers in the snapshot, but always i get read failed. The arduino works as a sensor and it sends data when I ask it from the Raspberry using i2cget. Hello, there is no EEPROM on the Arrow SocKit kit. This is also resolved by reading a different bus and reading again on the intended bus. Thing Plus' Wire lib was written for a SAMD21, which has a single Sercom interrupt for I2C slave operations. Thanks. When I connect same device to AXI I2C PMOD and try to read _invalid_ address - I can see SCL and SDA - 9 clocks or so and i2cget util report read failed. I have a puzzle , 0x40, 0x0f have a continuing high level ,an then host send the 0x41order 。I don't know whether it's normal ? When I try to read _valid_ address for first time - I can see up to 30 or so clocks on SCL and some data on SDA and then both SCL and SDA go low and stay low forever (until reset). I also then tried to use i2cget directly, but i2cget also fails: root@VP88x_2017_3_PRJ0191:/mnt# i2cget -f -y 1 0x22 0xd1 w Error: Read failed. i2cget is unable to read values from the board: $ i2cget -y 1 8 Error: Read failed. When this flag is … Nor can I … Explanation. i2cget 6 0x44 0x04, i get an error: "Read failed". The old i2c pins on P1 are now the i2c-1 pins (P1-1 = 3.3V; P1-3 = SDA; P1-5 = SCL; P1-6 = GRND). Code: i2cget -y 12 0x40 0 c, the answer is OK, but only. With i2cget -y 3 0x29 0xD it works for a while too, but then starts throwing Error: Read failed. ... 1 Doesn't work most of the time and I have continuous "read failed" errors. # i2cget -y 1 0x40 0x00 w Error: Read failed. Whereas, the SAMD51 uses 4 Sercom Interrupts when being used as an I2C slave. N'T see the wave of 0x00 ,the I2C get read failed: Connection timed out shyam but can. 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