Fastest way to set output pin?

I have an interrupt which I'm trying to streamline (for an STM32F031K6). I am using some commands like

GPIOA->BSRR |= (1<<4);

and i was surprised to see how much there is in this command in the disassembly. Is there any faster way of implementing this?

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Best answer by Tesla DeLorean

GPIOA->BSRR = (1<<4); // Singular write, as designed, not RMW

Guru

GPIOA->BSRR = (1<<4); // Singular write, as designed, not RMW

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Super User

There is never a need to read the BSRR register. It always reads as zero.

The current output state is given in the ODR register.

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Chief

If you want to go fats, make sure GPIOA->BSRR is read from RAM, not Flash. Wait state to read that data may apply.

Associate III

interesting, how do i do that?

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