topic Bootload doesn't launch application in Kinetis Microcontrollers

Bootload doesn't launch application

MarcoGiammarini — Fri, 16 Apr 2021 21:09:16 GMT

Dear all,

I'm working on bootloader over KL27. I put the bootloader at address 0x0, and the application at 0x4000.

After I write the new application into flash memory, I try to restart the application by pointing to application startup address, but it fail and restart the code from 0 (from the bootloader).

The launch code is the following. Is it correct?

Any ideas?

Thanks

Marco

appStartAddress = APPLICATION_START_ADDRESS; p_appStartAddress = (uint32_t *) appStartAddress; // Read the first location of application section // which contains the address of stack pointer. // If it is 0xFFFFFFFF then the application section is empty. if (*p_appStartAddress == 0xFFFFFFFF) { while (1) { // Wait indefinitely } } // Start address is valid... // Pointer to the Application Section void (*applicationCodeEntry)(void); // Rebase the Stack Pointer __set_MSP(*(uint32_t *) APPLICATION_START_ADDRESS); // Rebase the vector table base address SCB->VTOR = ((uint32_t) APPLICATION_START_ADDRESS & SCB_VTOR_TBLOFF_Msk); // Load the Reset Handler address of the application applicationCodeEntry = (void (*)(void))(unsigned *)(*(unsigned *)(APPLICATION_START_ADDRESS + 4)); // Jump to user Reset Handler in the application applicationCodeEntry();

Re: Bootload doesn't launch application

nxf56274 — Mon, 19 Apr 2021 02:02:09 GMT

Hi,

You can refer this link. bootloader

Have a great day,
TIC

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Re: Bootload doesn't launch application

MarcoGiammarini — Mon, 19 Apr 2021 09:24:34 GMT

Dear @nxf56274

with the code suggested in the post, the MCU reset immediately with LOCKUP bit high.

What's wrong?

Best,

Marco

Re: Bootload doesn't launch application

nxf56274 — Tue, 20 Apr 2021 01:52:41 GMT

Hi,

Please use the led demo as application. And show me how you go to application.

Have a great day,
TIC

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