I am trying to use the CYUSB3KIT-0003 FX3 to forwards GPIO to USB3 through GPIF.
I created two DMA channels :
One from USB3 channel 1 ( INPUT 0x01) to GPIF PIB BLOCK 0 .
One from GPIF PIB BLOCK 4 to USB3 channel 1 (OUTPUT 0x81).
Next I have the configuration for my GPIF state machine where I wait for a DMA request on thread0 and write the data on the corresponding DATA_BUS (8bits). After writing I jump to another state where I compare (with the action CMP_DATA) the value of one bit on the databus that I come to write. Indeed, I want to read back my data bus value to the USB3 channel OUTPUT only when I receive from my USB3 channel INPUT a packet with the bit 5 at 1.
Can I compare the value of the databus using CMP_DATA with the value databus value I come to set ?
I don't know if the mistake come from my state model or my DMA configuration.
Unfortunatly I didn't find a way to do it... The write works but I never receive read data...
I tried to test a simple loop that read/write byte by byte on the databus. But I am still stuck...
I made a new state machine with only 3 states : DMA_WAIT WRITE READ.
On the DMA_WAIT state I have a simple transition, when a DMA_RDY_TH0 occurs I jump to WRITE.
On WRITE I have one action (DR_DATA). Because I juste want to write on byte, I unchecked "Update new value from data source" and "Repeat actions until next transition". The unique transition is a Logic_one that goes to READ.
On Read I have 2 actions : IN_DATA and COMMIT because I only want to read 8bytes and send the value on the USB3 socket. I also unchecked the ''Repeat actions until next transition". I set a DMA_RDY_TH0 transition to go back to WRITE and a ! DMA_RDY_TH0 to go to DMA_WAIT.
The first byte is well write on the data bus, but after I have nothing more (no read and write after) .... I can't read data, or write more...