full duplex and loopback

[Eric Pooch]

I am struggling to get SPI loopback mode working with libftdispi and
UM232H (using FT232H). I want to do full duplex SPI transfers, so I
thought the loopback would be a good way to test my settings.
Unfortunately, I can't get it to work right regardless of how I set up
my clock edges, etc. The spi mode settings do affect the input, but
not in a way that reflects the data that is input. Even more
concerning, I get different input if I physically connect the DO and
DI pins than if I set the internal loopback. I can post more code,
but I am basically doing:

ftdispi_open(&fsc, &fc, INTERFACE_A);
ftdispi_setmode(&fsc, 1, 0, 0, 0, 0, 0);
ftdispi_setclock(&fsc, 5000);
ftdispi_setloopback(&fsc, 1);

i=ftdispi_write_read(&fsc, wbuf, 16, rbuf, 16, 0);

for results, do not get an error, but I get an empty read buffer,
except for the first two characters, which are always the same as each
other, but vary depending on the mode settings and clock speed. I
know my module properly reads data and appears to write properly
also. It just can't do them both at the same time.
thanks for any help you can provide.

[Stany MARCEL]

Hello,

Sorry for the delay, have you found a solution ?

Regards,