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rp: add async flash

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Implement an async flash mode using the XIP background best effort
read interface.  Only reads are actually async, write and erase remain
blocking.
This commit is contained in:
Derek Hageman
2023-07-25 15:54:33 -06:00
parent e3cc0d168c
commit 7ed9e29326
6 changed files with 254 additions and 26 deletions
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14
tests/rp/src/bin/flash.rs
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@ -6,11 +6,11 @@ mod common;
use defmt::*;
use embassy_executor::Spawner;
use embassy_rp::flash::{ERASE_SIZE, FLASH_BASE};
use embassy_rp::flash::{Async, ERASE_SIZE, FLASH_BASE};
use embassy_time::{Duration, Timer};
use {defmt_rtt as _, panic_probe as _};
const ADDR_OFFSET: u32 = 0x4000;
const ADDR_OFFSET: u32 = 0x8000;
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
@ -23,7 +23,7 @@ async fn main(_spawner: Spawner) {
// https://github.com/knurling-rs/defmt/pull/683
Timer::after(Duration::from_millis(10)).await;
let mut flash = embassy_rp::flash::Flash::<_, { 2 * 1024 * 1024 }>::new(p.FLASH);
let mut flash = embassy_rp::flash::Flash::<_, Async, { 2 * 1024 * 1024 }>::new(p.FLASH, p.DMA_CH0);
// Get JEDEC id
let jedec = defmt::unwrap!(flash.jedec_id());
@ -60,6 +60,14 @@ async fn main(_spawner: Spawner) {
defmt::panic!("unexpected");
}
let mut buf = [0u32; ERASE_SIZE / 4];
defmt::unwrap!(flash.background_read(ADDR_OFFSET, &mut buf)).await;
info!("Contents after write starts with {=u32:x}", buf[0]);
if buf.iter().any(|x| *x != 0xDADADADA) {
defmt::panic!("unexpected");
}
info!("Test OK");
cortex_m::asm::bkpt();
}