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STM32G030, Does not enter bootloader when boot0 is 3.3V. What is boot selector option bit. Thank you
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RM0454 contains the Flash Option Bytes in section 3.4.1 and lists an ST production value of 0xDFFF'E1AA for the User and read protection option bytes.
That means nBoot0 = nBoot1 = nBOOT_SEL = 1, which meets pattern 11, condidtion 3 in AN2606, if the Flash is empty:
nBoot0(bit) = 1, nBOOT0_SEL(bit) = 1, BOOT_LOCK(bit) = 0 and main Flash memory empty
(please note that BOOT_LOCK(bit) is only available in the STM32G0x1 and is read as 0 in STM32G0x0)
This also means that you have to reset nBOOT_SEL (bit) to 0 during programming via the bootloader, otherwise the device cannot be accessed later via Boot0 (pin) = 1 after programming.
Good luck!
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/Peter
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