Thanks a lot Fausto for that diagram. It is really clear. It confirms that the GPIO pins of the Odroid are mostly compatible. The only pin with which I have a problem is the pin 37 (GPIO26). On the Odroid it is an Analog to Digital Input. I rewired everything and connected another GPIO of the Odroid to pin 37 of the DAQHAT. I also changed the GPIO number in the util.c file to match my change. For the moment, I still have problems with the SPI communication, but I'll continue investigate.
Thanks again for your help.
Stephanie