User Manual

CDriver User Guide 17

i display status information (uptime, voltage, current, temperature)

d device scan

w dev bytes write bytes to I

C device dev

p send a STOP

r dev N read N bytes from I

C device dev, then STOP

m enter I

C bus monitor mode

For example the command:

i2ccl /dev/ttyUSB0 r 0x48 2

reads two bytes from the I

C device at address 0x48. So with an LM75B tem-

perature sensor connected you might see output like:

0x16,0x20

which indicates a temperature of about 22

◦

C devices usually have multiple registers. To read register 3 of the LM75B,

you ﬁrst write the register address 3, then read two bytes as before:

i2ccl /dev/ttyUSB0 w 0x48 3 r 0x48 2

0x50,0x00

Which shows that register 3 has the value 0x5000.

5.4 Monitor mode

In monitor mode, the I

CDriver does not write any data to the I

C bus. Instead

it monitors bus trafﬁc and draws it on the display. This makes it an ideal tool for

troubleshooting and debugging I

C hardware and software.

To show that it is in monitor mode, the I

CDriver changes the character in the

top-left of the display from D to M.

There are several ways of entering monitor mode:

• use the command-line tool: