MSP430FR2355: BSL works only after break point

Hardy Zissel

I use this sequence for the start of the BSL:

    TB1CTL = 0x00;
    TB2CTL = 0x00;
    TB3CTL = 0x00;
    __delay_cycles(1000000);
    ((void (*)())0x1000)(); // jump to BSL

Unfortunately, the BSL is only responsive if I set a break point in one of the lines. After the stop at the break point I switch the baud rate of the terminal program, which is connected to UCA0, to 9600 baud. (The application works with a different baud rate at this interface). After that I let the program run. Now the BSL is addressable. If I do not set the break point, the BSL does not respond.

Can someone tell where the difference is here? What do I have to do to make the BSL run without the previous program stop?
Thank you very much.

over 3 years ago

0 Amruta Deole over 3 years ago

TI__Intellectual 2065 points

Hi Hardy,

To clarify, you are changing the baud rate after the breakpoint? Also, are you disabling interrupts beforehand, see Section 3.3.1.1 of the BSL FRAM User's Guide.

Amruta

0 Hardy Zissel over 3 years ago in reply to Amruta Deole

Intellectual 510 points

Hi Amruta,
yes. the interrupts are disabled and ACLK is set down to 8 MHz. Do registers with certain values have to be loaded?
Hardy

0 Amruta Deole over 3 years ago in reply to Hardy Zissel

TI__Intellectual 2065 points

Hi Hardy,

There was another customer that was having trouble with the 9600 baud rate on the MSP430FR2355, see here for the e2e thread. They had to set the parity bit to even. Would you mind checking this?

Amruta

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MSP430FR2355: BSL works only after break point