No data outputed

we purchased a SNOWLeo SDR kit and started to develop an application on it.

We write some data to MM2S_SRC_ADDR (actually to an address which is map to MM2S_SRC_ADDR) and use axi_dma_init() and axi_dma_start().
(actually we use a firmware that is very similar to the matlab version)

We use another device to receive this data, pass through and ADC and do an analyse with matlab.

the problem is, no matter the data feeded, all we got at the is a sinus. the device doesnt seem to be able to read and send our data.

do you think that is caused from an error on our side or is there a bug (in the matlab firmware or in
is there an update to (is it open source??)