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RTOS/PROCESSOR-SDK-AM437X: PRU UART pinmux

Part Number: PROCESSOR-SDK-AM437X


Tool/software: TI-RTOS

I want to use PRU UART for the general UART communication.so I download the example program(C:\ti\pru\examples\am437x\PRU_Hardware_UART) from pru-addon-v4.0-Windows-Install.exe to test the PRU UART port.But when I unable loopback , I can get the data from the hard line(pro_uart0_rxd/txd).

should I set pin mux before running this example? can it be set in the pru?

before, I use the C:\ti\pru\examples\am437x\PRU_gpioToggle to test the PRU GPIO,I can operate GPIO directly without any others.

I have read the answers to other questions and found that the pinmultiplex setting must be done in ARM. How can I do so?