Module gpio 

General-purpose I/O.

A pin’s port, number and mode all live in its type.

Pins are handed out by GpioExt::split. Modes are changed with the into_* methods, each returning a new type.

let parts = dp.gpioa.split(&mut rcu);
let mut led = parts.pa5.into_output();
led.set_high().unwrap();
let tx = parts.pa9.into_alternate::<1>();

Two modes are special. PA13/PA14 start as Debugger, since after reset they really are wired to SWD; leaving that goes through the separate activate_into_*() family. Pin::lock freezes a configuration until the next chip reset, which the type reflects as Locked — with no way back, since the hardware has none either.

Structs

Alternate

Mode: alternate function AF, routing the pin to a peripheral, driven as OTYPE (PushPull or OpenDrain).

Analog

Mode: analog, the input mode the ADC requires.

Debugger

Mode: serial-wire debug, the reset state of PA13/PA14.

ErasedPin

A pin whose identity has moved into runtime values, keeping its mode.

Input

Mode: digital input.

Locked

Mode: configuration frozen until the next chip reset, wrapping the mode it was locked in.

OpenDrain

Output type: driven low, released high — needs a pull-up to reach a high level.

Output

Mode: digital output, of type OTYPE (PushPull or OpenDrain).

PartsA

The pins of this port, in their reset modes.

PartsB

The pins of this port, in their reset modes.

PartsC

The pins of this port, in their reset modes.

PartsF

The pins of this port, in their reset modes.

Pin

A single pin: P is the port ('A', 'B', 'C' or 'F'), N the pin number.

PushPull

Output type: driven both high and low.

Enums

Port

Which port an ErasedPin came from.

Pull

Internal pull resistor.

Speed

Output slew rate. Slower edges radiate less; faster ones are needed for high-speed peripherals.

Traits

Active

Marks a mode whose pin may be reconfigured.

GpioExt

Extension trait splitting a GPIO port into its individual pins.

HasLock

Marks a pin on a port that has a LOCK register, gating Pin::lock.

ValidAf

Marks AF as a valid alternate function number for this pin.