How to jump to bootloader on STM32L071xx

Forum|Forum|5 years ago
November 9, 2020
4 replies
1869 views

Hi!

I have been searching for days trying to find an answer to this question. Lots of people have similar questions but none of the answers have worked for me.

I am trying to get my STM32L071xx to jump to bootloader from application code. I need this to be able to update it when the device is installed.

I have code from an STM32F0 that i was hoping to just copy and change out the address, but sadly it wasnt that easy.

Here is the jum to bootloader function i am trying:

void jumpToBootloader(void)
{
 
 void (*SysMemBootJump)(void);
 
 volatile uint32_t addr = 0x1FF00000; // from AN2606
 
 __disable_irq();
 
 HAL_RCC_DeInit();
 
 SysTick->CTRL = 0;
 SysTick->LOAD = 0;
 SysTick->VAL = 0;
 
 SysMemBootJump = (void (*)(void)) (*((uint32_t *)(addr + 4)));
 
 __set_MSP(*(uint32_t *)addr);
 
 SysMemBootJump();
 
}

To simplify my testing i made a minimal CubeMX project where i blink an led a few times, and then attempt to jump to the bootloader. This project is attached.

As the code is now, it seems to exit jumpToBootloader() and then hang on a delay in the main loop, since interrupts are disabled.

As i have said, i have tried many different suggestions, but I have yet to try modifying the startup file. I really dont feel like that should be necessary?

As you can see from the project i build using Make and my arm-none-eabi-gcc is version 9.3.1 0200408.

Edit:

I am also getting som compiler warnings related to the __set_MSP() function:

arm-none-eabi-gcc -c -mcpu=cortex-m0plus -mthumb -DUSE_HAL_DRIVER -DSTM32L071xx -ICore/Inc -IDrivers/STM32L0xx_HAL_Driver/Inc -IDrivers/STM32L0xx_HAL_Driver/Inc/Legacy -IDrivers/CMSIS/Device/ST/STM32L0xx/Include -IDrivers/CMSIS/Include -Og -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"build/main.d" -Wa,-a,-ad,-alms=build/main.lst Core/Src/main.c -o build/main.o
In file included from Drivers/CMSIS/Device/ST/STM32L0xx/Include/stm32l071xx.h:114,
 from Drivers/CMSIS/Device/ST/STM32L0xx/Include/stm32l0xx.h:151,
 from Drivers/STM32L0xx_HAL_Driver/Inc/stm32l0xx_hal_def.h:30,
 from Drivers/STM32L0xx_HAL_Driver/Inc/stm32l0xx_hal_rcc.h:29,
 from Core/Inc/stm32l0xx_hal_conf.h:187,
 from Drivers/STM32L0xx_HAL_Driver/Inc/stm32l0xx_hal.h:30,
 from Core/Inc/main.h:31,
 from Core/Src/main.c:21:
Drivers/CMSIS/Include/cmsis_gcc.h: In function 'jumpToBootloader':
Drivers/CMSIS/Include/core_cm0plus.h:93:28: warning: listing the stack pointer register 'sp' in a clobber list is deprecated [-Wdeprecated]
 93 | #define __ASM __asm /*!< asm keyword for GNU Compiler */
 | ^~~~~
Drivers/CMSIS/Include/cmsis_gcc.h:190:3: note: in expansion of macro '__ASM'
 190 | __ASM volatile ("MSR msp, %0\n" : : "r" (topOfMainStack) : "sp");
 | ^~~~~
Drivers/CMSIS/Include/core_cm0plus.h:93:28: note: the value of the stack pointer after an 'asm' statement must be the same as it was before the statement
 93 | #define __ASM __asm /*!< asm keyword for GNU Compiler */
 | ^~~~~
Drivers/CMSIS/Include/cmsis_gcc.h:190:3: note: in expansion of macro '__ASM'
 190 | __ASM volatile ("MSR msp, %0\n" : : "r" (topOfMainStack) : "sp");
 | ^~~~~

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