Does STM32L431 support bit band operation

[HSX.1]

What are the SRAM bit band area address and its bit band alias area address, and the peripheral bit band area address and its bit band alias area address, if supported?

[gregstm]

There are address ranges mentioned in the Cortex M4 Programming manual -

https://www.st.com/resource/en/programming_manual/dm00046982-stm32-cortexm4-mcus-and-mpus-programming-manual-stmicroelectronics.pdf

[TDK]

Bit banding addresses are shown in the programming manual. Not everything is bit banded.

 

Source:

https://www.st.com/resource/en/programming_manual/dm00046982-stm32-cortexm4-mcus-and-mpus-programming-manual-stmicroelectronics.pdf

[HSX.1]

Therefore, STM32L431 does not support bit band operations

[waclawek.jan]

How did you come to that conclusion?

JW

[HSX.1]

I guess it, I didn't get

[gregstm]

"Does STM32L431 support bit band operation?" - yes (it does)

[HSX.1]

My programming looks like this, but it doesn't work

[gregstm]

as Uwe mentions below, you don't need bit banding for the GPIO registers - use the BSRR register. From the reference manual "The purpose of the GPIOx_BSRR and GPIOx_BRR registers is to allow atomic read/modify accesses to any of the GPIOx_ODR registers."

[waclawek.jan]

So, are the GPIO addresses within the area which is bit-banded (see TDK's post above)?

JW

[HSX.1]

These are the GPIO address

[TDK]

Are those addresses within the bit banded region of the above table?

[waclawek.jan]

So?

[Uwe Bonnes]

b.t.w. no need to bitband access GPIO_ODR. Use GPIO_BSRR instead! And for reading GPIO, simple use IDR and mask out the bit.