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RTOS/CC2640R2F: CC2640R2F UART Connection

Part Number: CC2640R2F
Other Parts Discussed in Thread: CC2640, CC1310

Tool/software: TI-RTOS

Hello,

I'm working on two CC2640 Launchpad and using your simple_serial_socket_server and simple_serial_socket_client code. I tested the demo mentioned in Git and could use serial port assiant to send and receive data using UART through USB.

However, when I connect CC2640 LP with another device(CC1310) through UART. I could not receive anything at my server.

I tested CC1310 UART output with both oscilloscope and USB which worked well. Could anyone tell me if there is any modification I should do to make it work? 

Thanks a lot!