Not getting data length or interrupt on uart + dma on lpuart port of stm32l4r5

Hi,

I am using Stm32l4r5 controller for my project.

I would like to configure lpuart in DMA + interrupt mode and want to read **** of any length.

But code generated through Stm32cubeMX not allowing me to read variable length data through lpuart.

Receiving Data length may not be known to me.

Please help me for configuration, I am new to stm32l4r5.

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