[digitaltom]

Fantastic article, thanks for taking the time to write it up! I'm trying to learn about embedded systems at the moment and it feela like a super steep learning curve, really appreciate your post breaking everything down.

A little typo I think I spotted: ' So, to turn on our LED we want to set the BR8 field, and to turn it off, we want to set the BS8 field.'

Should this be: ' So, to turn on our LED we want to clear the BR8 field, and to turn it off, we want to set the BS8 field. '

[lochsh]

Thank you for the compliment ^_^ I'm glad you found the post helpful.

This isn't a typo, actually. If you look at the documentation of the BSRR register (which is screenshotted in the blog post), it says of BRy:

> These bits are write-only [...] [Setting to 1] Resets the corresponding ODRx bit

So setting BR8 in the BSRR clears the ORD8 bit in the output data register. Because our LED is active low, this turns the LED on.

The indirection can make this a little confusing, I hope this cleans it up!

[digitaltom]

Ahh I see now, thank you for teaching me. My mistake!

Do you happen to know of any great learning resources, basically more posts like you've written that go into lots of details and explain why things are done?

Thanks again!

[lochsh]

I'm not sure I do have suggestions for such resources sadly :( If anyone has any please drop them here!