GPIO Read/Write Multiple Bits at once

Firmware
2

Here you can see how to read the entire port that the pin you want is on:
https://gist.github.com/technobly/8573877

And here is how to write individual bits:
https://gist.github.com/technobly/8342185

To write the whole port you need to write to the ODR (Output Data Register), so it should be something like this:
PIN_MAP[pin].gpio_peripheral->ODR = 0xFFFF;

Except this still seems like it might be missing something… so keep us updated on what you dig up.

You might want to take a look at :spark: STM32F Reference Manual (RM0008) (9.2MB)

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