esp-idf/components/efuse/esp32s2/esp_efuse_fields.c

/*
 * SPDX-FileCopyrightText: 2017-2021 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include "esp_efuse.h"
#include "esp_efuse_utility.h"
#include "esp_efuse_table.h"
#include "stdlib.h"
#include "esp_types.h"
#include "assert.h"
#include "esp_err.h"
#include "esp_log.h"
#include "soc/efuse_periph.h"
#include "bootloader_random.h"
#include "sys/param.h"

const static char *TAG = "efuse";

// Contains functions that provide access to efuse fields which are often used in IDF.

// Returns chip version from efuse
uint8_t esp_efuse_get_chip_ver(void)
{
    // should return the same value as bootloader_common_get_chip_revision()
    uint32_t chip_ver = 0;
    // TODO: ESP32S2 does not have this field
    return chip_ver;
}

// Returns chip package from efuse
uint32_t esp_efuse_get_pkg_ver(void)
{
    uint32_t pkg_ver = 0;
    esp_efuse_read_field_blob(ESP_EFUSE_PKG_VERSION, &pkg_ver, 4);
    return pkg_ver;
}

void esp_efuse_write_random_key(uint32_t blk_wdata0_reg)
{
    uint32_t buf[8];
    uint8_t raw[24];

    bootloader_fill_random(buf, sizeof(buf));

    ESP_LOGV(TAG, "Writing random values to address 0x%08x", blk_wdata0_reg);
    for (int i = 0; i < 8; i++) {
        ESP_LOGV(TAG, "EFUSE_BLKx_WDATA%d_REG = 0x%08x", i, buf[i]);
        REG_WRITE(blk_wdata0_reg + 4 * i, buf[i]);
    }
    bzero(buf, sizeof(buf));
    bzero(raw, sizeof(raw));
}

esp_err_t esp_efuse_disable_rom_download_mode(void)
{
    return esp_efuse_write_field_bit(ESP_EFUSE_DIS_DOWNLOAD_MODE);
}

esp_err_t esp_efuse_set_rom_log_scheme(esp_efuse_rom_log_scheme_t log_scheme)
{
    int cur_log_scheme = 0;
    esp_efuse_read_field_blob(ESP_EFUSE_UART_PRINT_CONTROL, &cur_log_scheme, 2);
    if (!cur_log_scheme) { // not burned yet
        return esp_efuse_write_field_blob(ESP_EFUSE_UART_PRINT_CONTROL, &log_scheme, 2);
    } else {
        return ESP_ERR_INVALID_STATE;
    }
}

esp_err_t esp_efuse_enable_rom_secure_download_mode(void)
{
    if (esp_efuse_read_field_bit(ESP_EFUSE_DIS_DOWNLOAD_MODE)) {
        return ESP_ERR_INVALID_STATE;
    }
    return esp_efuse_write_field_bit(ESP_EFUSE_ENABLE_SECURITY_DOWNLOAD);
}