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I tried changing the //! Writes and reads flash memory.
//!
//! Uses flash address 0x9000 (default NVS)
//! See https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/partition-tables.html#built-in-partition-tables
//% FEATURES: esp-storage esp-hal/unstable esp-hal/psram esp-alloc/internal-heap-stats esp-hal/log
//% CHIPS: esp32 esp32c2 esp32c3 esp32c6 esp32h2 esp32s2 esp32s3
#![no_std]
#![no_main]
extern crate alloc;
use embedded_storage::{ReadStorage, Storage};
use esp_backtrace as _;
use esp_hal::main;
use esp_println::println;
use esp_storage::FlashStorage;
fn init_psram_heap(start: *mut u8, size: usize) {
unsafe {
esp_alloc::HEAP.add_region(esp_alloc::HeapRegion::new(
start,
size,
esp_alloc::MemoryCapability::External.into(),
));
}
}
#[main]
fn main() -> ! {
esp_println::logger::init_logger_from_env();
let peripherals = esp_hal::init(
esp_hal::Config::default()
.with_cpu_clock(esp_hal::clock::CpuClock::max())
.with_psram(esp_hal::psram::PsramConfig::default()),
);
let (start, size) = esp_hal::psram::psram_raw_parts(&peripherals.PSRAM);
init_psram_heap(start, size);
println!("Going to access PSRAM");
let mut large_vec = alloc::vec::Vec::<u32>::with_capacity(500 * 1024 / 4);
for i in 0..(500 * 1024 / 4) {
large_vec.push((i & 0xff) as u32);
}
println!("vec size = {} bytes", large_vec.len() * 4);
println!("vec address = {:p}", large_vec.as_ptr());
println!("vec[..100] = {:?}", &large_vec[..100]);
let string = alloc::string::String::from("A string allocated in PSRAM");
println!("'{}' allocated at {:p}", &string, string.as_ptr());
println!("{}", esp_alloc::HEAP.stats());
let mut bytes = [0u8; 32];
let mut flash = FlashStorage::new();
let flash_addr = 0x9000;
println!("Flash size = {}", flash.capacity());
println!();
flash.read(flash_addr, &mut bytes).unwrap();
println!("Read from {:x}: {:02x?}", flash_addr, &bytes[..32]);
bytes[0x00] = bytes[0x00].wrapping_add(1);
bytes[0x01] = bytes[0x01].wrapping_add(2);
bytes[0x02] = bytes[0x02].wrapping_add(3);
bytes[0x03] = bytes[0x03].wrapping_add(4);
bytes[0x04] = bytes[0x04].wrapping_add(1);
bytes[0x05] = bytes[0x05].wrapping_add(2);
bytes[0x06] = bytes[0x06].wrapping_add(3);
bytes[0x07] = bytes[0x07].wrapping_add(4);
flash.write(flash_addr, &bytes).unwrap();
println!("Written to {:x}: {:02x?}", flash_addr, &bytes[..32]);
let mut reread_bytes = [0u8; 32];
flash.read(flash_addr, &mut reread_bytes).unwrap();
println!("Read from {:x}: {:02x?}", flash_addr, &reread_bytes[..32]);
println!("Reset (CTRL-R in espflash) to re-read the persisted data.");
loop {}
}And it seems to work fine |
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Well, with ESP32-S3 is works, with ESP32 it fails. |
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I started remarking code to identify the point that's causing the failure. It's towards the end of One I enable that, it fails, if it's not running, things work. Inside that function, its And in there: Deeper than that is jumping into the HW 😄 |
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I can confirm with my above example it doesn't work for ESP32 (but does for S2 and S3) - esp-storage is accessing SPI0 and SPI1 directly on ESP32 and having PSRAM enabled might get them into unexpected states. For S2/S3 we are using ROM-functions which apparently account for that |
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So is that a bug in esp-storage? or a limitation that PSRAM and Flash can't be accessed together on ESP32? |
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I guess it is supposed to work together, and it suggests it's a bug in esp-storage then |
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I'm using with
ESP32S3a crate to read the partition table -esp-partition-table. I'm also using PSRAM with that same application successfuly.Now I want to use it with
ESP32and with a basic program it's working (basic meaning, not using PSRAM).Once I enable the feature
quad-psramonesp-halit stops working showing the partitions data.From what I understand, all it does is use
esp-storageto read the flash at the partition table location and parse the partitions. Enabling psram just on the feature flag (no change in code) breaks it.Is it a bug? a limitation of esp32 that flash can't be read when PSRAM is active? Any additional feature-flag I need to deal with to make it work?
This is the code, I minimized it as much as possible
These are the relevant lines from cargo:
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