59 lines
1.4 KiB
Rust
59 lines
1.4 KiB
Rust
//! This shows how to use PSRAM as heap-memory via esp-alloc
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//!
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//! You need an ESP32-S3 with at least 2 MB of PSRAM memory.
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//% CHIPS: esp32s3
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//% FEATURES: esp-hal/octal-psram
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#![no_std]
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#![no_main]
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extern crate alloc;
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use alloc::{string::String, vec::Vec};
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use esp_alloc as _;
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use esp_backtrace as _;
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use esp_hal::{entry, psram};
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use esp_println::println;
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fn init_psram_heap(start: *mut u8, size: usize) {
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unsafe {
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esp_alloc::HEAP.add_region(esp_alloc::HeapRegion::new(
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start,
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size,
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esp_alloc::MemoryCapability::External.into(),
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));
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}
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}
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#[cfg(is_not_release)]
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compile_error!("PSRAM example must be built in release mode!");
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#[entry]
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fn main() -> ! {
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esp_println::logger::init_logger_from_env();
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let peripherals = esp_hal::init(esp_hal::Config::default());
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let (start, size) = psram::psram_raw_parts(&peripherals.PSRAM);
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init_psram_heap(start, size);
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println!("Going to access PSRAM");
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let mut large_vec: Vec<u32> = Vec::with_capacity(500 * 1024 / 4);
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for i in 0..(500 * 1024 / 4) {
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large_vec.push((i & 0xff) as u32);
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}
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println!("vec size = {} bytes", large_vec.len() * 4);
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println!("vec address = {:p}", large_vec.as_ptr());
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println!("vec[..100] = {:?}", &large_vec[..100]);
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let string = String::from("A string allocated in PSRAM");
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println!("'{}' allocated at {:p}", &string, string.as_ptr());
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println!("done");
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loop {}
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}
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