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AWR1843BOOST: running MRR demo in USRR only mode , output is nothing!

Part Number: AWR1843BOOST
Other Parts Discussed in Thread: UNIFLASH

Hello,everyone,

 I want to use USRR 30m only mode when running the MRR demo. I made below changes to the code in 

"lab0011_mrr_beamsteering\src\common\mrr_config_consts.h"  (as in "mrr_2_0_Developer_Guide.pdf")

/**! @brief The multi-mode Radar mode of operation. */

//#define SUBFRAME_CONF_MRR_USRR /* Two subframes, MRR followed by USRR20. */
/**! @brief The USRR only mode of operation. */
#define SUBFRAME_CONF_USRR /* One subframe USRR20. */
/**! @brief The MRR only mode of operation. */
// #define SUBFRAME_CONF_MRR /* One subframe MRR80. */

Re-build, Uniflash download and Run.

But  the data uart output is empty! 

Why does this happen? someone knows the reason ?

Thanks a lot!