Hello everyone 

The issue as follows:

Develop with SDKv1.2. 

I want to transfer data by USB3.0 with DMA mode. I create 3 DMA chanels.and two for data transfer the third for command transfer.

As we know just one DMA channel can work at the same time.But I want to transfer command during data transfer.Data transfer is not continue.So I want to transfer command in data transmission interval. So the DMA for command transfer must be CY_U3P_DMA_TYPE_MANUAL mode .Before command transfer I should check if other two DMA channels are busy or idle.

Is there any function to get the DMA status .Does somebody get me an sample .And does my scheme word?

thanks

ayi 

Hi Ayi,

check the function "CyU3PDmaChannelGetStatus" and compare the producer and consumer counts. If they are eqal, no data is in  progress.

Why are you no using the control channel EP0? There you do not have to check if data is in progress. I think you also do not have to check if any data is in progress while you like to send control transfers. The dma should be connected to different sockets and they are connected to different endpoints. So the endpoint work for user like parallel.

If I may not understand you right then I am sorry, please try a exactlier explanation.

regards,

lumpi

 Hi lumpi 

Thanks for your replay.

>check the function "CyU3PDmaChannelGetStatus" and compare the producer and consumer counts. If they are >eqal, no data is in  progress.

 I know the function "CyU3PDmaChannelGetStatus".But I think there is no "IDLE" with return value .And what the mean "compare the producer and consumer counts"? And how to compare?

>Why are you no using the control channel EP0? There you do not have to check if data is in progress. I think you >also do not have to check if any data is in progress while you like to send control transfers. The dma should be >connected to different sockets and they are connected to different endpoints. So the endpoint work for user like >parallel.

I use 3 DMA channel :U1-->P1  P1-->U1 and U2-->P2.And after the channels is created the socket address is fixed . So I think  the endpoint work for user not like parallel. When  the" U1-->P1 "channel is used  I want to send command(the command shouled be send by GPIF to external device :FPGA ,the command is not like the vender request,the command can be understand as data transfer ) by "U2-->P2"channel .I just think of the GPIF interface can't be share.

Besr regard

ayi

Hi Ayi

>check the function "CyU3PDmaChannelGetStatus" and compare the producer and consumer counts. If they are >eqal, no data is in  progress.

 I know the function "CyU3PDmaChannelGetStatus".But I think there is no "IDLE" with return value .And what the mean "compare the producer and consumer counts"? And how to compare?

If you compare these counts you can see if any data is in progress. If producer count is higher than consumer count, then consumer has data left to transmit. If both counts are the same, then no data is in progress and there is no transmission ongoing.

>Why are you no using the control channel EP0? There you do not have to check if data is in progress. I think you >also do not have to check if any data is in progress while you like to send control transfers. The dma should be >connected to different sockets and they are connected to different endpoints. So the endpoint work for user like >parallel.

I use 3 DMA channel :U1-->P1  P1-->U1 and U2-->P2.And after the channels is created the socket address is fixed . So I think  the endpoint work for user not like parallel. When  the" U1-->P1 "channel is used  I want to send command(the command shouled be send by GPIF to external device :FPGA ,the command is not like the vender request,the command can be understand as data transfer ) by "U2-->P2"channel .I just think of the GPIF interface can't be share.

Ok, in this the interface truely can not be shared. You may also can check the DMA callback functions. They notify may be some DMA event you need to do y

regards,

lumpi

 Can I use uart or i2c  port  to communicate with FPGA? FX3 receive control data from ep0,and translate control data,then communicate with fpga through uart or i2c port?

Hi cityhunterlyf 

I2C should be work .Othe project used before ,But if I use I2C to transfer command the FPGA GPIF  RTL must be rewrite.  

regaed

ayi

Hi cityhunterlyf,

you can also use the UART port to communicate with the FPGA. That is a bit faster than the I2C port. It is a pitty that you can not use the really fast SPI port while you are using GPIF II in 32-bit mode.

regards,

lumpi