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MSP430FR2433: Invoke BSL mode from UART A0 port

lung hsing cheng
Prodigy 50 points

Part Number: MSP430FR2433

Hi,

I'm trying to implement a FW update feature via external Bluetooth device through UART A0 port under BSL mode.

I open UART A0 port with baud rate 115200 and send a pre-designed command to trigger FR2433 jump into BSL mode. Then I close UART A0 port and re-open UART A0 port with baud rate 9600, but somehow I cannot receive any response from FR2433.

With exact the same steps only if I first open UART A1 port instead of A0 port and send pre-designed command to jump into BSL mode, then open UART A0 port with baud rate 9600, FR2433 respond perfectly.

I got a same result when I tested it from TeraTerm via USB. If I ever open A0 port with baud rate 115200 before jump into BSL mode, I won't get any response.

From statement above, I'm sure that BSL invocation is no problem for me. So why can't I get the same response from only UART A0 port?

Thanks for any reply.

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