For your chip, is it possible to change a pin's mode without modifying bits from other pins? I believe the stm32 family of devices often requires one of those two approaches, because the GPIO peripheral fundamentally cannot set pin modes individually.
Other implementations simply took a mutable reference to the peripheral instead, which is what I chose on a later iteration.ĭepending on your chip, critical sections or a reference to the peripheral may not be needed. Let me know if I should post this in CodeReview instead, I wasn't fully sure where to best post this.įor example, The stm32f0xx implementation used critical sections and then stole the pointer to the peripherals directly. It can be found here: Added first GPIO implementation by robamu It would be great if some experienced HAL library writer could review the implementation. Other than that, A lof of the code is similar to the other implementations, but there are some hardware specific details.įor example, the output pins are only stateful if a certain bit is set, which is different from the stm32 implementations, so I had to get a little bit creative there.
Other implementations simply took a mutable reference to the peripheral instead, which is what I chose on a later iteration. For example, The stm32f0xx implementation used critical sections and then stole the pointer to the peripherals directly. Some of these implementation differ in style, which might be because the hardware might obviously be slightly different. I've written a first version for a HAL which is heavily based on the stm32fXxx GPIO HAL implementations. I recently managed to create a PAC for the Vorago VA108xx family of devices which are based on ARM Cortex-M0 and now I'm interested in writing a HAL.
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