51 lines
1.5 KiB
Rust
51 lines
1.5 KiB
Rust
//! Writes and reads flash memory.
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//!
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//! Uses flash address 0x9000 (default NVS)
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//! See https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/partition-tables.html#built-in-partition-tables
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//% FEATURES: esp-storage
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//% CHIPS: esp32 esp32c2 esp32c3 esp32c6 esp32h2 esp32s2 esp32s3
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#![no_std]
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#![no_main]
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use embedded_storage::{ReadStorage, Storage};
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use esp_backtrace as _;
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use esp_hal::entry;
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use esp_println::println;
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use esp_storage::FlashStorage;
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#[entry]
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fn main() -> ! {
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let mut bytes = [0u8; 32];
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let mut flash = FlashStorage::new();
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let flash_addr = 0x9000;
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println!("Flash size = {}", flash.capacity());
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println!();
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flash.read(flash_addr, &mut bytes).unwrap();
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println!("Read from {:x}: {:02x?}", flash_addr, &bytes[..32]);
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bytes[0x00] = bytes[0x00].wrapping_add(1);
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bytes[0x01] = bytes[0x01].wrapping_add(2);
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bytes[0x02] = bytes[0x02].wrapping_add(3);
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bytes[0x03] = bytes[0x03].wrapping_add(4);
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bytes[0x04] = bytes[0x04].wrapping_add(1);
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bytes[0x05] = bytes[0x05].wrapping_add(2);
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bytes[0x06] = bytes[0x06].wrapping_add(3);
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bytes[0x07] = bytes[0x07].wrapping_add(4);
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flash.write(flash_addr, &bytes).unwrap();
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println!("Written to {:x}: {:02x?}", flash_addr, &bytes[..32]);
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let mut reread_bytes = [0u8; 32];
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flash.read(flash_addr, &mut reread_bytes).unwrap();
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println!("Read from {:x}: {:02x?}", flash_addr, &reread_bytes[..32]);
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println!("Reset (CTRL-R in espflash) to re-read the persisted data.");
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loop {}
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}
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