User Manual

CDriver User Guide 24

7.4 Raw protocol

CDriver uses a serial protocol to send and receive I

C commands. Connect

to the I

CDriver at 1M baud, 8 bits, no parity, 1 stop bit (1000000 8N1).

Because many I

CDriver commands are ASCII, you can control it interactively

from any terminal application that can connect at 1M baud. For example typing

u and s toggles the CS line and ? displays the status info.

Commands are:

? transmit status info

e byte echo byte

1 set speed to 100 KHz

4 set speed to 400 KHz

s addr send START/addr, return status

0x80-bf read 1-64 bytes, NACK the ﬁnal byte

0xc0-ff write 1-64 bytes

a N read N bytes, ACK every byte

p send STOP

x reset I

C bus

r register read

d scan devices, return 112 status bytes

m enter monitor mode

c enter capture mode

b enter bitbang mode

i leave bitmang, return to I

C mode

u byte set pullup control lines

v start analog voltage measurement

w read voltage measurement result

So for example to send this sequence: