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DMA BF548

Question asked by zanzibar on Apr 18, 2011
Latest reply on Apr 19, 2011 by WassimB

Hello,

 

I use BF548+external parallel DAC on PPI0.

 

SCLK= 100Mhz

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 ?

 

Thanks,

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