LailaTheElf/embassy
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Add ability to invert UART pins

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
embassy-rp/src/uart/mod.rs
View File

@ -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));
} }