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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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42
examples/rp/src/bin/flash.rs
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@ -6,7 +6,7 @@
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_rp::peripherals::FLASH;
use embassy_time::{Duration, Timer};
use {defmt_rtt as _, panic_probe as _};
@ -25,7 +25,7 @@ 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::<_, FLASH_SIZE>::new(p.FLASH);
let mut flash = embassy_rp::flash::Flash::<_, Async, FLASH_SIZE>::new(p.FLASH, p.DMA_CH0);
// Get JEDEC id
let jedec = flash.jedec_id().unwrap();
@ -40,10 +40,12 @@ async fn main(_spawner: Spawner) {
multiwrite_bytes(&mut flash, ERASE_SIZE as u32);
background_read(&mut flash, (ERASE_SIZE * 2) as u32).await;
loop {}
}
fn multiwrite_bytes(flash: &mut embassy_rp::flash::Flash<'_, FLASH, FLASH_SIZE>, offset: u32) {
fn multiwrite_bytes(flash: &mut embassy_rp::flash::Flash<'_, FLASH, Async, FLASH_SIZE>, offset: u32) {
info!(">>>> [multiwrite_bytes]");
let mut read_buf = [0u8; ERASE_SIZE];
defmt::unwrap!(flash.read(ADDR_OFFSET + offset, &mut read_buf));
@ -71,7 +73,7 @@ fn multiwrite_bytes(flash: &mut embassy_rp::flash::Flash<'_, FLASH, FLASH_SIZE>,
}
}
fn erase_write_sector(flash: &mut embassy_rp::flash::Flash<'_, FLASH, FLASH_SIZE>, offset: u32) {
fn erase_write_sector(flash: &mut embassy_rp::flash::Flash<'_, FLASH, Async, FLASH_SIZE>, offset: u32) {
info!(">>>> [erase_write_sector]");
let mut buf = [0u8; ERASE_SIZE];
defmt::unwrap!(flash.read(ADDR_OFFSET + offset, &mut buf));
@ -99,3 +101,35 @@ fn erase_write_sector(flash: &mut embassy_rp::flash::Flash<'_, FLASH, FLASH_SIZE
defmt::panic!("unexpected");
}
}
async fn background_read(flash: &mut embassy_rp::flash::Flash<'_, FLASH, Async, FLASH_SIZE>, offset: u32) {
info!(">>>> [background_read]");
let mut buf = [0u32; 8];
defmt::unwrap!(flash.background_read(ADDR_OFFSET + offset, &mut buf)).await;
info!("Addr of flash block is {:x}", ADDR_OFFSET + offset + FLASH_BASE as u32);
info!("Contents start with {=u32:x}", buf[0]);
defmt::unwrap!(flash.erase(ADDR_OFFSET + offset, ADDR_OFFSET + offset + ERASE_SIZE as u32));
defmt::unwrap!(flash.background_read(ADDR_OFFSET + offset, &mut buf)).await;
info!("Contents after erase starts with {=u32:x}", buf[0]);
if buf.iter().any(|x| *x != 0xFFFFFFFF) {
defmt::panic!("unexpected");
}
for b in buf.iter_mut() {
*b = 0xDABA1234;
}
defmt::unwrap!(flash.write(ADDR_OFFSET + offset, unsafe {
core::slice::from_raw_parts(buf.as_ptr() as *const u8, buf.len() * 4)
}));
defmt::unwrap!(flash.background_read(ADDR_OFFSET + offset, &mut buf)).await;
info!("Contents after write starts with {=u32:x}", buf[0]);
if buf.iter().any(|x| *x != 0xDABA1234) {
defmt::panic!("unexpected");
}
}