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TDA4VM: R5f UART DMA receives variable length data

chen hy
Prodigy 60 points

Part Number: TDA4VM

I hope to use UART DMA to receive variable length data. How do I achieve it? Now the demo in PDK uses DMA to receive fixed length data. For example, I set rxtriglvl = 8, but if a packet of data may be an indefinite length data, which may be 15 bytes, 20 bytes, 23 bytes, etc., how can I receive a packet of data completely