MSP430FR5872: Invoking BSL Through Software

Hi Pattern,

You should properly be entering BSL mode if you are jumping to address 0x1000. What does your code look like to do this? 

Pattern Odhiambo said:

The hardware sequence works

When you say the hardware sequence works, do you mean that after using Hardware invocation you are able to correctly program via BSL and UART? 

Are you following the correct format for UART BSL commands?

Best Regards,
Brandon Fisher

This is the code I've run unsuccessfully:

#include <msp430.h>

void main(void) {
    WDTCTL = WDTPW | WDTHOLD;               // Stop watchdog timer
    PM5CTL0 &= ~LOCKLPM5;                   // Disable the GPIO power-on default high-impedance mode
                                            // to activate previously configured port settings

    P1DIR |= 0x01 << 0;                     // Set P1.0 to output direction (RED LED)
    P9DIR |= 0x01 << 7;                     // Set P9.7 to output direction (GREEN LED)

    P1OUT |= 0x01 << 0;                     // Start P1.0 as output HIGH
    P9OUT |= 0x01 << 7;                     // Start P1.0 as output HIGH

    P1OUT |= 0x01 << 1;                     // Button needs a pull-up resistor
    P1REN |= 0x01 << 1;

    volatile unsigned int pressCount = 0;   // volatile to prevent optimization

    for(;;) {
        volatile unsigned int i;            // volatile to prevent optimization

        if (! (P1IN & (0x01 << 1)) ){       // Is the Button pushed?
            P1OUT ^= 0x01 << 0;             // Toggle RED using exclusive-OR

            pressCount++;

            if (pressCount >= 10){
                P9OUT ^= (0x01 << 7);       // Toggle GREEN using exclusive-OR
                
                //Jump to BSL here
                __disable_interrupt();      // disable interrupts
                ((void (*)())0x01000)();    // jump to BSL
            }

            i = 20000;                      // SW Delay
            do i--;
            while(i != 0);
        }
    }
}

Hi Pattern,

Glad to hear you figured it out. I'll mark this thread as closed for now. Feel free to make another post if you have any other issues down the line.

Best Regards,
Brandon Fisher

Hi Brandon,

Before closing the thread, kindly shed me some light on whether the BSL code exists entirely in a protected area of memory or whether the region of 0x1000 to 0x100F is unprotected as stated in the documentation. Currently, I'm having to disable memory protection for the chip for the BSL to be accessible. Is there an alternative way to render the BSL code accessible?

Regards,

Pattern

Hi Pattern,

Your original BSL invoke should work. 

What binary are you trying to program? If this is trying to access a protected region of memory then the MPU may be triggering an NMI. 

Best Regards,
Brandon Fisher

Hi Pattern,

Your original BSL invoke should work. Jumping to BSL should not require this.

What binary are you trying to program? If this is trying to access a protected region of memory then the MPU may be triggering an NMI. 

Best Regards,
Brandon Fisher