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rp/spi: add configurable pha/pol

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This commit is contained in:
Dario Nieuwenhuis 2021-06-30 23:43:40 +02:00
parent f073bdfe43
commit 53c236fde8
1 changed files with 9 additions and 2 deletions
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11
embassy-rp/src/spi.rs
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@ -3,20 +3,27 @@ use core::marker::PhantomData;
use embassy::util::Unborrow; use embassy::util::Unborrow;
use embassy_extras::unborrow; use embassy_extras::unborrow;
use embedded_hal::blocking::spi as eh; use embedded_hal::blocking::spi as eh;
use embedded_hal::spi as ehnb;
use crate::gpio::sealed::Pin as _; use crate::gpio::sealed::Pin as _;
use crate::gpio::{NoPin, OptionalPin}; use crate::gpio::{NoPin, OptionalPin};
use crate::{pac, peripherals}; use crate::{pac, peripherals};
pub use ehnb::{Phase, Polarity};
#[non_exhaustive] #[non_exhaustive]
pub struct Config { pub struct Config {
pub frequency: u32, pub frequency: u32,
pub phase: ehnb::Phase,
pub polarity: ehnb::Polarity,
} }
impl Default for Config { impl Default for Config {
fn default() -> Self { fn default() -> Self {
Self { Self {
frequency: 1_000_000, frequency: 1_000_000,
phase: ehnb::Phase::CaptureOnFirstTransition,
polarity: ehnb::Polarity::IdleLow,
} }
} }
} }
@ -65,8 +72,8 @@ impl<'d, T: Instance> Spi<'d, T> {
p.cpsr().write(|w| w.set_cpsdvsr(presc as _)); p.cpsr().write(|w| w.set_cpsdvsr(presc as _));
p.cr0().write(|w| { p.cr0().write(|w| {
w.set_dss(0b0111); // 8bit w.set_dss(0b0111); // 8bit
w.set_spo(false); w.set_spo(config.polarity == ehnb::Polarity::IdleHigh);
w.set_sph(false); w.set_sph(config.phase == ehnb::Phase::CaptureOnSecondTransition);
w.set_scr((postdiv - 1) as u8); w.set_scr((postdiv - 1) as u8);
}); });
p.cr1().write(|w| { p.cr1().write(|w| {