STM32F030 Bare metal - finding answers on documentation

[Jeroen3]

It is not available for DMA.

What do you mean? Here it works fine with DMA:

...

In the manual is written:

The Cortex®-M4 memory map includes two bit-band regions. These regions map each word
in an alias region of memory to a bit in a bit-band region of memory. Writing to a word in the
alias region has the same effect as a read-modify-write operation on the targeted bit in the
bit-band region.
In the STM32L41xxx/42xxx/43xxx/44xxx/45xxx/46xxx devices both the peripheral registers
and the SRAM1 are mapped to a bit-band region, so that single bit-band write and read
operations are allowed. The operations are only available for Cortex®-M4 accesses, and not
from other bus masters (for example, DMA).

The bold bit above.

[Karel]

I lost hours because I didn't understand why bit-banding doesn't work with the ADC.
Appears that the bit-banding covers the address range from 0x40000000 to 0x400fffff and
the ADC, RNG, AES and GPIOx peripherals are outside that region. No warning, not mentioned anywhere...