I would like confirmation of the behavior of a standalone DMA_RDY_TH* event within the transition equation of a GPIF II state machine. What I mean is that when the from and to states of the DMA_RDY_TH* event does not have any actions, what is the behavior of this event? I ask because after looking through the documentations, especially "7.11 GPIF II State Machine to Read Data into a Socket" in the FX3 technical reference manual where it gives the clearest example of this event, I cannot find anything relating to using this event without any corresponding IN_DATA or DR_DATA action.
For reference, below is the GPIF II state machine and associated DMA channel configuration.
From my own testing, the DMA_RDY_TH0 and DMA_RDY_TH1 are LOW when both DMA buffers of the corresponding producer socket are filled, wrapped up, and committed to the USB consumer. They are HIGH when at least one buffer of the corresponding producer socket is empty and ready to read in data from the PPort data bus. Is my understanding correct? Or is the usage of these events invalid here even though the GPIF II Designer gave no errors or warnings?
CyU3PMemSet((uint8_t *)&dmaMultiConfig, 0, sizeof(dmaMultiConfig));
dmaMultiConfig.size = DMA_BUFFER_SIZE;
dmaMultiConfig.count = DMA_BUFFER_COUNT;
dmaMultiConfig.validSckCount = 2;
dmaMultiConfig.prodSckId[0] = (CyU3PDmaSocketId_t)PING_PRODUCER_SOCKET; // CY_U3P_PIB_SOCKET_0
dmaMultiConfig.prodSckId[1] = (CyU3PDmaSocketId_t)PONG_PRODUCER_SOCKET; // CY_U3P_PIB_SOCKET_1
dmaMultiConfig.consSckId[0] = (CyU3PDmaSocketId_t)CY_FX_EP_CONSUMER_SOCKET; // CY_U3P_UIB_SOCKET_CONS_1
dmaMultiConfig.prodAvailCount = 0;
dmaMultiConfig.prodHeader = 0;
dmaMultiConfig.prodFooter = 0;
dmaMultiConfig.consHeader = 0;
dmaMultiConfig.dmaMode = CY_U3P_DMA_MODE_BYTE;
Status = CyU3PDmaMultiChannelCreate(&glDualGPIF2USB_Handle, CY_U3P_DMA_TYPE_AUTO_MANY_TO_ONE, &dmaMultiConfig);
Thank you
