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nrf/gpio: add input+output to Flex, for OpenDrain.

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This commit is contained in:
Dario Nieuwenhuis 2022-05-03 00:43:04 +02:00
parent b1afe54c5f
commit 29402fa76b
1 changed files with 45 additions and 25 deletions
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70
embassy-nrf/src/gpio.rs
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@ -7,10 +7,10 @@ use core::marker::PhantomData;
use cfg_if::cfg_if;
use embassy::util::Unborrow;
use embassy_hal_common::{unborrow, unsafe_impl_unborrow};
use gpio::pin_cnf::DRIVE_A;
use crate::pac;
use crate::pac::p0 as gpio;
use crate::pac::p0::pin_cnf::{DRIVE_A, PULL_A};
use self::sealed::Pin as _;
@ -129,9 +129,30 @@ impl<'d, T: Pin> Output<'d, T> {
}
}
fn convert_drive(drive: OutputDrive) -> DRIVE_A {
match drive {
OutputDrive::Standard => DRIVE_A::S0S1,
OutputDrive::HighDrive0Standard1 => DRIVE_A::H0S1,
OutputDrive::Standard0HighDrive1 => DRIVE_A::S0H1,
OutputDrive::HighDrive => DRIVE_A::H0H1,
OutputDrive::Disconnect0Standard1 => DRIVE_A::D0S1,
OutputDrive::Disconnect0HighDrive1 => DRIVE_A::D0H1,
OutputDrive::Standard0Disconnect1 => DRIVE_A::S0D1,
OutputDrive::HighDrive0Disconnect1 => DRIVE_A::H0D1,
}
}
fn convert_pull(pull: Pull) -> PULL_A {
match pull {
Pull::None => PULL_A::DISABLED,
Pull::Up => PULL_A::PULLUP,
Pull::Down => PULL_A::PULLDOWN,
}
}
/// GPIO flexible pin.
///
/// This pin can either be a disconnected, input, or output pin. The level register bit will remain
/// This pin can either be a disconnected, input, or output pin, or both. The level register bit will remain
/// set while not in output mode, so the pin's level will be 'remembered' when it is not in output
/// mode.
pub struct Flex<'d, T: Pin> {
@ -158,17 +179,7 @@ impl<'d, T: Pin> Flex<'d, T> {
self.pin.conf().write(|w| {
w.dir().input();
w.input().connect();
match pull {
Pull::None => {
w.pull().disabled();
}
Pull::Up => {
w.pull().pullup();
}
Pull::Down => {
w.pull().pulldown();
}
}
w.pull().variant(convert_pull(pull));
w.drive().s0s1();
w.sense().disabled();
w
@ -180,22 +191,31 @@ impl<'d, T: Pin> Flex<'d, T> {
/// The pin level will be whatever was set before (or low by default). If you want it to begin
/// at a specific level, call `set_high`/`set_low` on the pin first.
pub fn set_as_output(&mut self, drive: OutputDrive) {
let drive = match drive {
OutputDrive::Standard => DRIVE_A::S0S1,
OutputDrive::HighDrive0Standard1 => DRIVE_A::H0S1,
OutputDrive::Standard0HighDrive1 => DRIVE_A::S0H1,
OutputDrive::HighDrive => DRIVE_A::H0H1,
OutputDrive::Disconnect0Standard1 => DRIVE_A::D0S1,
OutputDrive::Disconnect0HighDrive1 => DRIVE_A::D0H1,
OutputDrive::Standard0Disconnect1 => DRIVE_A::S0D1,
OutputDrive::HighDrive0Disconnect1 => DRIVE_A::H0D1,
};
self.pin.conf().write(|w| {
w.dir().output();
w.input().disconnect();
w.pull().disabled();
w.drive().variant(drive);
w.drive().variant(convert_drive(drive));
w.sense().disabled();
w
});
}
/// Put the pin into input + output mode.
///
/// This is commonly used for "open drain" mode. If you set `drive = Standard0Disconnect1`,
/// the hardware will drive the line low if you set it to low, and will leave it floating if you set
/// it to high, in which case you can read the input to figure out whether another device
/// is driving the line low.
///
/// The pin level will be whatever was set before (or low by default). If you want it to begin
/// at a specific level, call `set_high`/`set_low` on the pin first.
pub fn set_as_input_output(&mut self, pull: Pull, drive: OutputDrive) {
self.pin.conf().write(|w| {
w.dir().output();
w.input().connect();
w.pull().variant(convert_pull(pull));
w.drive().variant(convert_drive(drive));
w.sense().disabled();
w
});