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Add ability to invert UART pins

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This is useful in some cases where the surrounding circuit
for some reason inverts the UART signal, for instance if you're talking
to a device via an optocoupler.
This commit is contained in:
Jacob Davis-Hansson 2023-04-14 21:05:03 +02:00
parent a3ecf5caf6
commit b9fc2a6b33
1 changed files with 29 additions and 4 deletions
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33
embassy-rp/src/uart/mod.rs
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@ -6,6 +6,7 @@ use crate::dma::{AnyChannel, Channel};
use crate::gpio::sealed::Pin; use crate::gpio::sealed::Pin;
use crate::gpio::AnyPin; use crate::gpio::AnyPin;
use crate::{pac, peripherals, Peripheral}; use crate::{pac, peripherals, Peripheral};
use crate::pac::io::vals::Inover;
#[cfg(feature = "nightly")] #[cfg(feature = "nightly")]
mod buffered; mod buffered;
@ -53,6 +54,14 @@ pub struct Config {
pub data_bits: DataBits, pub data_bits: DataBits,
pub stop_bits: StopBits, pub stop_bits: StopBits,
pub parity: Parity, pub parity: Parity,
/// Invert the tx pin output
pub invert_tx: bool,
/// Invert the rx pin input
pub invert_rx: bool,
// Invert the rts pin
pub invert_rts: bool,
// Invert the cts pin
pub invert_cts: bool,
} }
impl Default for Config { impl Default for Config {
@ -62,6 +71,10 @@ impl Default for Config {
data_bits: DataBits::DataBits8, data_bits: DataBits::DataBits8,
stop_bits: StopBits::STOP1, stop_bits: StopBits::STOP1,
parity: Parity::ParityNone, parity: Parity::ParityNone,
invert_rx: false,
invert_tx: false,
invert_rts: false,
invert_cts: false,
} }
} }
} }
@ -381,19 +394,31 @@ impl<'d, T: Instance + 'd, M: Mode> Uart<'d, T, M> {
let r = T::regs(); let r = T::regs();
unsafe { unsafe {
if let Some(pin) = &tx { if let Some(pin) = &tx {
pin.io().ctrl().write(|w| w.set_funcsel(2)); pin.io().ctrl().write(|w| {
w.set_funcsel(2);
w.set_inover(if config.invert_tx { Inover::INVERT } else { Inover::NORMAL });
});
pin.pad_ctrl().write(|w| w.set_ie(true)); pin.pad_ctrl().write(|w| w.set_ie(true));
} }
if let Some(pin) = &rx { if let Some(pin) = &rx {
pin.io().ctrl().write(|w| w.set_funcsel(2)); pin.io().ctrl().write(|w| {
w.set_funcsel(2);
w.set_inover(if config.invert_rx { Inover::INVERT } else { Inover::NORMAL });
});
pin.pad_ctrl().write(|w| w.set_ie(true)); pin.pad_ctrl().write(|w| w.set_ie(true));
} }
if let Some(pin) = &cts { if let Some(pin) = &cts {
pin.io().ctrl().write(|w| w.set_funcsel(2)); pin.io().ctrl().write(|w| {
w.set_funcsel(2);
w.set_inover(if config.invert_cts { Inover::INVERT } else { Inover::NORMAL });
});
pin.pad_ctrl().write(|w| w.set_ie(true)); pin.pad_ctrl().write(|w| w.set_ie(true));
} }
if let Some(pin) = &rts { if let Some(pin) = &rts {
pin.io().ctrl().write(|w| w.set_funcsel(2)); pin.io().ctrl().write(|w| {
w.set_funcsel(2);
w.set_inover(if config.invert_rts { Inover::INVERT } else { Inover::NORMAL });
});
pin.pad_ctrl().write(|w| w.set_ie(true)); pin.pad_ctrl().write(|w| w.set_ie(true));
} }