Circular buffer on flash
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Green Pill rev. c
As is commonly known, many STM32 MCUs, including the STM32F103 used on the Blue Pill boards, contains more non-volatile flash storage than is advertised by ST. On my own Green Pill board a STM32F103C8 MCU is used. This MCU has got - according to ST, 64kB of flash, but in reality it is identical to the STM32F103CB and it does have 128kB of flash. This is documented in quite some detail here.
STM32 Read internal temperature and voltage reference
