Kontron KTAM3874-pITX - Manual (Page 42)

KTD-S0057-I Page 38 Linux® Programming Examples (DebianTM)
KTAM3874/pITX Software Guide
transfer
(fd);
close (fd);
return ret;
}
You should consider following parameter limits:
Parameter MIN MAX Units
Databits (Bits per Word) 4 32 Bits
Transmission Speed 2000 48000000 Hz
Transmission Mode Only full duplex possible (driver restriction)
Bit Transfer Mode Only MSB first mode possible
Note: The test array of the original sourcecode contains 38 bytes but this number can cause a crash if you
use 32 data bits (number should be 36 bytes).
Further information is available on
https://www.kernel.org/doc/Documentation/spi/spi-summary .
Examples:
Using default values ./spi
Set speed to 10 MHz ./spi -s 10000000
Set mode to 3 ./spi -H -O
As result you should see this screen output: