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A comment on Programming ARM μC in Rust at four different levels of abstraction. Parent comment

Re:Programming ARM μC in Rust at four different levels of ab... by leoedin on Thursday February 22, 2018 @05:54AM (#16436709)
AVR microcontrollers use the same register to define the pin value when it's set as an output, and define the state of the internal pullups when it's set as an input.

I haven't seen that in ARM microcontrollers, but as peripherals vary across manufacturers I don't think you can assume that it's not done this way.

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Re:Programming ARM μC in Rust at four different levels of ab... by Doxin on Friday February 23, 2018 @06:05AM (#16445578)
Wouldn't you then write two sets of functions? set_high, set_low, enable_pullup, disable_pullup. Now internally set_high and enable_pullup might do the exact same thing, but externally they signal intent and prevent you from trying to set a pullup on an output for example.
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