PSoC™ 5, 3 & 1 Forum Discussions

Guys,

How can I see that UART is sending and receiving my command in PSoC designer ?

and what's the meaning of :

PRT0DR |=  0X80;
        while(PRT0DR & 0X80)    

any helps will be appreciated,

thank you

 Hi Team,

What is the max. frequency that can be cutoff by a LPF - My design involves a corner freq. around 500 KHz. &&

How does values of C1, C2, C3, C4 affect the same ? Which one should be preferred for a noise ridden (highly unpredictabe) pulse which rises sharply but fades off way too gradually ! (Butterworth/Chebyshev/2 or 4 pole)

Thanks.

  Intra-spoke DMA of > 16 bytes requires a ping-ponging of servicing between the source and destination engines within the DMA logic. The reason is there is a 16 byte internal FIFO that fills up by the source engine after which control is switched to the destination engine to empty that out. This is repeated until the burst is satisfied. This ping-ponging has to occur because both engines are operating on the same spoke.

This normally works fine. But, if a previous DMA request is still being serviced by the destination engine and before the request is finished,  the source engine for the new request may hit the FIFO limit. At that point since the destination engine is still working on an old DMA context it doesn't yet signal that the new request is an intra-spoke DMA. In the absence of this indication the source engine fails to send a "go" signal to the destination engine to empty out the FIFO for the new intra-spoke DMA request. The destination engine therefore sits idle and this causes the source engine to hang indefinitely since there is no room in the FIFO to do anymore work.

So its always better to have burst count <=16.