I use BF548+external parallel DAC on PPI0.
Output PPI0 clock = 50Mhz
There is a DMA which is transferring from memory arrays to parallel port.
For my test : I have 2 arrays to be transferred : 1 with a sinus signal and 1 with continous signal.
Although I have a problem of time when I change of arrays : I used DMA by interruption to change of arrays but DSP needs 360ns to reconfigure it and during this period output parallel port does not vary any longer.
So I used DMA by descriptor but time reconfiguration is still 112ns :sinus signal is frozen before being continous.
Can you advice how to do these transfers properly without these additional timings ?