nodemcu-firmware/app/platform/flash_api.c

/******************************************************************************
 * Flash api for NodeMCU
 * NodeMCU Team
 * 2014-12-31
*******************************************************************************/
#include "user_config.h"
#include "flash_api.h"
#include "spi_flash.h"

SPIFlashInfo *ICACHE_FLASH_ATTR
flash_get_info(void)
{   
    static SPIFlashInfo spi_flash_info NODE_STORE_ATTR;
    static bool is_spi_flash_info_initialized = false;
    // Make the code more fast
    if (!is_spi_flash_info_initialized)
    {
        SPIRead(0, &spi_flash_info, sizeof(spi_flash_info));
        is_spi_flash_info_initialized = true;
    }
	// return (SPIFlashInfo *)(0x40200000);
    return &spi_flash_info;	
}

uint8_t ICACHE_FLASH_ATTR
flash_get_size(void)
{
    SPIFlashInfo *p_spi_flash_info = flash_get_info();
    return p_spi_flash_info->size;
}

uint32_t ICACHE_FLASH_ATTR
flash_get_size_byte(void)
{
    static uint32_t flash_size = 0;
    // Make the code more fast
    if (flash_size == 0 )
    {
        SPIFlashInfo *p_spi_flash_info = flash_get_info();
        switch (p_spi_flash_info->size)
        {
        case SIZE_2MBIT:
            // 2Mbit, 256kByte
            flash_size = 256 * 1024;
            break;
        case SIZE_4MBIT:
            // 4Mbit, 512kByte
            flash_size = 512 * 1024;
            break;
        case SIZE_8MBIT:
            // 8Mbit, 1MByte
            flash_size = 1 * 1024 * 1024;
            break;
        case SIZE_16MBIT:
            // 16Mbit, 2MByte
            flash_size = 2 * 1024 * 1024;
            break;
        case SIZE_32MBIT:
            // 32Mbit, 4MByte
            flash_size = 4 * 1024 * 1024;
            break;
        default:
            // Unknown flash size, fall back mode.
            flash_size = 512 * 1024;
            break;
        }
    }
    return flash_size;
}

bool ICACHE_FLASH_ATTR
flash_set_size(uint8_t size)
{
    // Dangerous, here are dinosaur infested!!!!!
    // Reboot required!!!
    // If you don't know what you're doing, your nodemcu may turn into stone ...
    uint8_t data[SPI_FLASH_SEC_SIZE] NODE_STORE_ATTR;
    SPIRead(0, data, sizeof(data));
    SPIFlashInfo *p_spi_flash_info = (SPIFlashInfo *)(data);
    p_spi_flash_info->size = size;
    SPIEraseSector(0);
    SPIWrite(data, 0, sizeof(data));
    //p_spi_flash_info = flash_get_info();
    //p_spi_flash_info->size = size;
    return true;
}

bool ICACHE_FLASH_ATTR
flash_set_size_byte(uint32_t size)
{
    // Dangerous, here are dinosaur infested!!!!!
    // Reboot required!!!
    // If you don't know what you're doing, your nodemcu may turn into stone ...
    bool result = true;
    uint32_t flash_size = 0;
    switch (size)
    {
    case 256 * 1024:
        // 2Mbit, 256kByte
        flash_size = SIZE_2MBIT;
        flash_set_size(flash_size);
        break;
    case 512 * 1024:
        // 4Mbit, 512kByte
        flash_size = SIZE_4MBIT;
        flash_set_size(flash_size);
        break;
    case 1 * 1024 * 1024:
        // 8Mbit, 1MByte
        flash_size = SIZE_8MBIT;
        flash_set_size(flash_size);
        break;
    case 2 * 1024 * 1024:
        // 16Mbit, 2MByte
        flash_size = SIZE_16MBIT;
        flash_set_size(flash_size);
        break;
    case 4 * 1024 * 1024:
        // 32Mbit, 4MByte
        flash_size = SIZE_32MBIT;
        flash_set_size(flash_size);
        break;
    default:
        // Unknown flash size.
        result = false;
        break;
    }
    return result;
}

uint16_t ICACHE_FLASH_ATTR
flash_get_sec_num(void)
{
    static uint16_t result = 0;
    // Make the code more fast
    if (result == 0 )
    {
        result = flash_get_size_byte() / SPI_FLASH_SEC_SIZE;
    }
    return result;
}

uint8_t ICACHE_FLASH_ATTR
flash_get_mode(void)
{
    SPIFlashInfo *p_spi_flash_info = flash_get_info();
    switch (p_spi_flash_info->mode)
    {
    // Reserved for future use
    case MODE_QIO:
        break;
    case MODE_QOUT:
        break;
    case MODE_DIO:
        break;
    case MODE_DOUT:
        break;
    }
    return p_spi_flash_info->mode;
}

uint32_t ICACHE_FLASH_ATTR
flash_get_speed(void)
{
    uint32_t speed = 0;
    SPIFlashInfo *p_spi_flash_info = flash_get_info();
    switch (p_spi_flash_info->speed)
    {
    case SPEED_40MHZ:
        // 40MHz
        speed = 40000000;
        break;
    case SPEED_26MHZ:
        //26.7MHz
        speed = 26700000;
        break;
    case SPEED_20MHZ:
        // 20MHz
        speed = 20000000;
        break;
    case SPEED_80MHZ:
        //80MHz
        speed = 80000000;
        break;
    }
    return speed;
}

bool ICACHE_FLASH_ATTR
flash_init_data_default(void)
{
    // FLASH SEC - 4
    // Dangerous, here are dinosaur infested!!!!!
    // Reboot required!!!
    // It will init system data to default!

    SPIEraseSector((flash_get_sec_num() - 4));
    SPIWrite((flash_get_sec_num() - 4) * SPI_FLASH_SEC_SIZE, 0x10000 - SPI_FLASH_SEC_SIZE + (0), 128);
    return true;
}

bool ICACHE_FLASH_ATTR
flash_init_data_blank(void)
{
    // FLASH SEC - 2
    // Dangerous, here are dinosaur infested!!!!!
    // Reboot required!!!
    // It will init system config to blank!
    SPIEraseSector((flash_get_sec_num() - 2));
    SPIEraseSector((flash_get_sec_num() - 1));
    return true;
}

bool ICACHE_FLASH_ATTR
flash_self_destruct(void)
{
    // Erase your flash. Good bye!
    SPIEraseChip();
    return true;
}