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Compiler/IWR6843ISK-ODS: How to send 0x00 byte to user UART port?

Part Number: IWR6843ISK-ODS
Other Parts Discussed in Thread: IWR6843

Tool/software: TI C/C++ Compiler

Hi,

  I would like to upgrade IWR6843-ODS radar firmware via UART. Following the document "IWR6843 Bootloader Flow" to configure UART TX & RX baud rate and boot the device in SOP 5 mode. The first step is send a break signal "0x00" to IWR6843-ODS. I try to send the 0x00 byte to radar board, but it's not response. Maybe the method is wrong. Can you help to provide the correct method to send "0x00" to radar board?

Thanks.

C.W.