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LP-MSPM0L1306: MSPM0L series

Part Number: LP-MSPM0L1306
Other Parts Discussed in Thread: MSPM0L1306

Tool/software:

Hii team,
I want to perform flash operations using uart bootloader(without  using SDK).
I am using MSPM0L1306 development board. I tried to invoke UART BSL mode through onboard switch NRST and BSL switch. Once I do this procedure LED blinking stopped( assumed that board is in BSL mode) and  tried to give connection command through default uart pins(BSLTX: PA23, BSLRX: PA22),
Response:
1) With logic analyzer, I didn't get any response from the target.
2) without analyzer, I got response as zero, but when I sent  Get Device Info command(0x19) ,I didn't get any proper response. sometimes ACK was OK, but BSL message was invalid.

Did I miss anything, Any help is appreciated

thank you.