If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
The UART’s FIFO/THR is emptied before the UART DMA mode or eDMA event has been disabled. The UART has sent a DMA request and is waiting for data from the eDMA. The eDMA has processed this DMA request. However, the next paramSet is a Dummy Transfer. Therefore, the eDMA does not transfer any data to the UART. When the UART DMA mode is disabled and re-enabled, there has not been any change in the status of the UART FIFO/THR. As such, the UART does not re-issue a DMA request. This is how the UART IP was designed. Unfortunately, there are no bits in the UART that indicate whether a DMA request is still outstanding.
