Anyway. I have tried the TMC2209-EVAL board and is not not even working as expected out of the box. I was trying for a couple of weeks and I had to give up. When I tried with the TMC2209-BOB also from TRINAMIC it worked straight without any effort.
0x05, 0x00, 0xEC, 0x10,0x00,0x00,0x53, 0x9C is the order that the TCM2209 expects to receive the data, was my point. First byte out of the UART is 0x05 sync byte etc. through to 0x9C CRC byte.
The driver's datasheet doesn't talk or care about a representation in MCU's memory. It talks about the driver's registers, which are 32-bit. The default value for CHOPCONF register 0x10000053 shows that the byte 0x10 corresponds to register bits [31:24] - the highest byte. As it must be transferred first, the datasheet is correct that the byte order is big-endian - highest byte first.
I have never got it to work with the EVAL board. I bought the TMC2209-BOB and worked like a charm.
Beware that you need to plug the motor coils terminals to make it work.
I have an example setup with a simple project I made with a NUCLEO board where I made a porting to C from an Arduino library to control the motor if you are interested. That works for me very well.
Hey, sorry to bump this after 8 months but would you mind sharing the code somewhere public? I've been banging my head against this for the last week. Thanks!
