SPRUJ17H March 2022 – October 2024 AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1
The FSI receiver can continuously receive data and move the data from the receiver buffer with the DMA. A DMA trigger is generated every time a data frame has been received. This is concurrent with the FRAME_DONE signal that sets the RX_EVT_STS_ALT1_.FRAME_DONE flag. To receive continuous data with the DMA, some configurations need to be made on the receiver.
First, set RX_DMA_CTRL.DMA_EVT_EN to 1. This allows the DMA trigger to propagate to the DMA module. The receiver is now able to trigger a DMA event upon the reception of a data frame.
The DMA must also be configured properly for the FSI to receive the data. One way for using the receiver to continuously feed the DMA is:
Unlike the transmitter, there is no requirement to have the DMA channel which is handling the data buffer, execute before the DMA channel handling the received tag and user data.