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Davide Rizzi
Davide Rizzi
Visitor II
September 11, 2017
Solved

STM32F303 internal bootloader does not work (if exiting from a reset)

  • September 11, 2017
  • 1 reply
  • 659 views
Posted on September 11, 2017 at 12:47

Part number is STM32F303CC.

A 24 MHz oscillator output is connected to PF0 pin.

Exiting from reset (either via nRST pin or SCB_AIRCR SYSRESETREQ bit), and having BOOT0 pulled up and USB cable connected, the bootloader waits forever for RCC_CR HSERDY bit to become 1.

The same identical problem presents with BOOT0 low, thus starting from Flash and jumping to the internal bootloader (SP@0x1FFFD800 and Reset@0x1FFFD804) - that is what we want to do.

BUT If I power cycle the board, everything works as expected (USB DFU bootloader up and running).

Is the bootloader supposed to start following a reset (as it is described on the refman and as it happens on other parts we have worked with)?

Am I missing something?
    This topic has been closed for replies.
    Best answer by Tesla DeLorean
    Posted on September 11, 2017 at 13:16

    >>The same identical problem presents with BOOT0 low, thus starting from Flash and jumping to the internal bootloader (SP@0x1FFFD800 and Reset@0x1FFFD804) - that is what we want to do.

    Do you map the ROM so that is shadows into the zero address space? SYSCFG mapping register

    1 reply

    Tesla DeLorean
    Tesla DeLoreanBest answer
    Guru
    September 11, 2017
    Posted on September 11, 2017 at 13:16

    >>The same identical problem presents with BOOT0 low, thus starting from Flash and jumping to the internal bootloader (SP@0x1FFFD800 and Reset@0x1FFFD804) - that is what we want to do.

    Do you map the ROM so that is shadows into the zero address space? SYSCFG mapping register

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