esp-storage 0.2.0

Implementation of embedded-storage traits to access unencrypted ESP32 flash
Documentation 
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use crate::maybe_with_critical_section;

const ESP_ROM_SPIFLASH_READ: u32 = 0x4000012c;
const ESP_ROM_SPIFLASH_UNLOCK: u32 = 0x40000130;
const ESP_ROM_SPIFLASH_ERASE_SECTOR: u32 = 0x40000120;
const ESP_ROM_SPIFLASH_WRITE: u32 = 0x40000128;

pub(crate) fn esp_rom_spiflash_read(src_addr: u32, data: *const u32, len: u32) -> i32 {
    maybe_with_critical_section(|| unsafe {
        let esp_rom_spiflash_read: unsafe extern "C" fn(u32, *const u32, u32) -> i32 =
            core::mem::transmute(ESP_ROM_SPIFLASH_READ);
        esp_rom_spiflash_read(src_addr, data, len)
    })
}

pub(crate) fn esp_rom_spiflash_unlock() -> i32 {
    maybe_with_critical_section(|| unsafe {
        let esp_rom_spiflash_unlock: unsafe extern "C" fn() -> i32 =
            core::mem::transmute(ESP_ROM_SPIFLASH_UNLOCK);
        esp_rom_spiflash_unlock()
    })
}

pub(crate) fn esp_rom_spiflash_erase_sector(sector_number: u32) -> i32 {
    maybe_with_critical_section(|| unsafe {
        let esp_rom_spiflash_erase_sector: unsafe extern "C" fn(u32) -> i32 =
            core::mem::transmute(ESP_ROM_SPIFLASH_ERASE_SECTOR);
        esp_rom_spiflash_erase_sector(sector_number)
    })
}

pub(crate) fn esp_rom_spiflash_write(dest_addr: u32, data: *const u32, len: u32) -> i32 {
    maybe_with_critical_section(|| unsafe {
        let esp_rom_spiflash_write: unsafe extern "C" fn(u32, *const u32, u32) -> i32 =
            core::mem::transmute(ESP_ROM_SPIFLASH_WRITE);
        esp_rom_spiflash_write(dest_addr, data, len)
    })
}