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Implements continuous sampling for the nRF SAADC

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Implements continuous sampling for the nRF SAADC and also renames `OneShot` to `Saadc`. The one-shot behaviour is retained with the `sample` method and a new `run_sampler` method is provided for efficiently (i.e. zero copying) sampler processing. A double buffer is used for continuously sampling, which wlll be swapped once sampling has taken place.

A sample frequency is provided and will set the internal timer of the SAADC when there is just the one channel being sampled. Otherwise, PPI will be used to hook up the TIMER peripheral to drive the sampling task.
This commit is contained in:
huntc
2021-10-12 11:24:26 +11:00
parent 90f6b56cba
commit 103a3305e2
3 changed files with 192 additions and 6 deletions
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4
examples/nrf/src/bin/saadc.rs
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@ -7,7 +7,7 @@ mod example_common;
use defmt::panic;
use embassy::executor::Spawner;
use embassy::time::{Duration, Timer};
use embassy_nrf::saadc::{ChannelConfig, Config, OneShot};
use embassy_nrf::saadc::{ChannelConfig, Config, Saadc};
use embassy_nrf::{interrupt, Peripherals};
use example_common::*;
@ -15,7 +15,7 @@ use example_common::*;
async fn main(_spawner: Spawner, mut p: Peripherals) {
let config = Config::default();
let channel_config = ChannelConfig::single_ended(&mut p.P0_02);
let mut saadc = OneShot::new(p.SAADC, interrupt::take!(SAADC), config, [channel_config]);
let mut saadc = Saadc::new(p.SAADC, interrupt::take!(SAADC), config, [channel_config]);
loop {
let mut buf = [0; 1];