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[FRDM-KV31F] UART with DMA only on TX with KSDK 1.3

Question asked by thomas kopp on Sep 5, 2018
Latest reply on Sep 10, 2018 by thomas kopp

Hello everybody,


For a new project in my company, i am using an FRDM-KV31F board and i am working with gcc and the KSDK 1.3 library, in order to gain time for the different tests that i need to perform.


I am transfering datas from two ADCs via an UART and a specific transfer protocol from my company, which RX frames doesn't have a fixed size.


However, as i need to transfer a lot of datas ( 2 ADCs, each >= 40 kHz), i therefore need to activate DMA on TX but not on RX (because the size of the frames received by the microcontroller can be variable).


I tried many things using the functions in the KSDK 1.3 library but i can't have something working. It seems that the UART_EDMA driver can only configure both TX and RX. I also tried to configure the UART with the UART driver and then to active one DMA channel but i didn't succeed.


Does anyone can give me a code example to do it with the KSDK 1.3 library functions ? or if not possible an other solution ?


Thanks in advance,


Best Regards,