Jump to Bootloader in STM32 through User Flash Memory i.e using Boot 0 and Boot 1 Pins in Boot mode from User Flash memory

[jasdeepsingh]

Posted on November 13, 2014 at 08:13

I have a requirement for firmware upgrade. I am planning to use USB DFU class. But command for firmware upgrade will come from PC application in my case . so i need to switch to bootloader which is there in System Memory. As initially i am running application so it is getting booted from User flash i.e i have Boot0 and Boot 1 pins configured for User flash. As DFU bootloader is there in System flash ,now for that Boot0 and Boot1 pins settings need to be changed . is there a way like Boot 0 and Boot 1 settings remain same as User Flash memory and in the application we jump to System Memory and use DFU for upgrading the firmware?

#stm3220g-eval #stm32f207-flash

[ivani]

Posted on November 13, 2014 at 08:44 You could remap the system memory to address 0x00000000 via MEM_MODE bits in SYSCFG_MEMRMP register then load the SP with the value residing @ 0x00000000 and jump on the address pointed by 0x00000004.

[jasdeepsingh]

Posted on November 13, 2014 at 10:51

By referring to the video Calling the STM32 SystemMemory Bootloader from your application i am using the below mentioned code. This code gets executed but still Dfuse application does not detects the STM device in DFM mode.

Even PC does not detects USB.void BootLoaderinit(uint32_t BootLoaderStatus){             JumpAddress = *(__IO uint32_t*) (0x1fff0004);      JumpToBoot = (SysMemBootJump) JumpAddress;  if(BootLoaderStatus == 1)  {      HAL_RCC_DeInit();    SysTick->CTRL =0;    SysTick->LOAD=0;    SysTick->VAL=0;       __set_PRIMASK(1);     /* Initialize user application's Stack Pointer */      __set_MSP(*(__IO uint32_t*) 0x20001000);      JumpToBoot();        }  while(1);  }

[ivani]

Posted on November 14, 2014 at 08:43 It seems that the system memory resides on a different address for different chips: - 0x1fff0000 for F4xx & F2xx devices - 0x1fffb000 for F1xx connectivity line - 0x1ffff000 for other F1xx devices - 0x1fffd800 for F3xx devices If you are using a direct call to system memory you need to check the exact address from the datasheet for the particular chip.

[Tesla DeLorean]

Posted on November 14, 2014 at 13:37

Probably because you're not entering in reset conditions. But rather than rehash this all over again.

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[Stig Hornang]

Posted on February 22, 2016 at 08:34

This works for me on a STM32F4 device. Must be called in the beginning of main() based your ''enter bootloader condition'' (magic constant in RAM etc.):

#define BOOTLOADER_START_ADDR 0x1FFF0000

void JumpToBootLoader(){    __HAL_SYSCFG_REMAPMEMORY_SYSTEMFLASH();    __set_MSP(*(__IO uint32_t*) 0x2001FFFF);    void (*bootloader)(void) = (void(*)(void)) *((uint32_t *) (BOOTLOADER_START_ADDR + 4));    bootloader();}

[Tesla DeLorean]

Posted on February 22, 2016 at 17:29

__set_MSP((__IO uint32_t*) 0x20020000); // 32-bit aligned preferred, will predecrement, pretty sure you want the address, not the data that's at the address

[Stig Hornang]

Posted on March 01, 2016 at 15:56

Oops, your statement makes sense.

I noticed that the jump works without  the __set_MSP call at all. Is it really needed?

[Tesla DeLorean]

Posted on March 01, 2016 at 17:26

Is it really needed?

It is more apt to succeed. This isn't how I transfer control. Several of the ROMs set the stack up again as part of the start up code. Keil also uses __initial_sp