What do you mean this is Polling mode. In your line 352 and 353, you are enabling interrupt for RX. In polling method line 352 and line 353 are used Rx interrupt. we are transmitting the data in while loop, we are checking tx data only still rx data not checked. Are you saying this same code is working fine in your prior purchased processors? If this is the case, can you run this code on your prior custom board to confirm this is indeed the case? In the above mentioned polling mode, data is transmitting and Receiving in both prior purchased and Newly purchased controller in our custom board. UART5 function is not working in interrupt method only. Please also provide your internal and external loopback results. Will update you soon Also can you compare your current schematic and the prior custom board schematic? Are they identical? Yes they are Identical. And Like I said before can you kindly elaborate the Device marking ( Datacode ) for the procured Controllers in the datasheet it mentioned as first two digit of marking is as Year and Month of manufacturing. can you mention the year of manufacturing for procured controller details are given above mentioned COC
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