I am using (well trying to use) a TI DRV8889 stepper motor with the atMega2560.
It supports a logic interface with separate pins for step, direction etc. It also has an SPI interface. This latter is causing me grief.
I have tested the SPI interface in loop-back mode and this works fine (SS problem encountered, learned, fixed).
However.... I am not having a lot of joy getting the SPI to talk to the DRV8889.
I have viewed some TI example code in C (for another uC). Notwithstanding that this example code uses a different message format to the data sheet, I seem to be doing the right things.... but rx only zeros (i.e. nothing).
I was wondering if anyone here has some experience with this TI stepper driver?