esp-idf/components/esp32/include/rom/efuse.h

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3.6 KiB
C

// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef _ROM_EFUSE_H_
#define _ROM_EFUSE_H_
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/** \defgroup efuse_APIs efuse APIs
* @brief ESP32 efuse read/write APIs
* @attention
*
*/
/** @addtogroup efuse_APIs
* @{
*/
/**
* @brief Do a efuse read operation, to update the efuse value to efuse read registers.
*
* @param null
*
* @return null
*/
void ets_efuse_read_op(void);
/**
* @brief Do a efuse write operation, to update efuse write registers to efuse, then you need call ets_efuse_read_op again.
*
* @param null
*
* @return null
*/
void ets_efuse_program_op(void);
/**
* @brief Read 8M Analog Clock value(8 bit) in efuse, the analog clock will not change with temperature.
* It can be used to test the external xtal frequency, do not touch this efuse field.
*
* @param null
*
* @return u32: 1 for 100KHZ, range is 0 to 255.
*/
uint32_t ets_efuse_get_8M_clock(void);
/**
* @brief Read spi flash pin configuration from Efuse
*
* @return
* - 0 for default SPI pins.
* - 1 for default HSPI pins.
* - Other values define a custom pin configuration mask. Pins are encoded as per the EFUSE_SPICONFIG_RET_SPICLK,
* EFUSE_SPICONFIG_RET_SPIQ, EFUSE_SPICONFIG_RET_SPID, EFUSE_SPICONFIG_RET_SPICS0, EFUSE_SPICONFIG_RET_SPIHD macros.
* WP pin (for quad I/O modes) is not saved in efuse and not returned by this function.
*/
uint32_t ets_efuse_get_spiconfig(void);
#define EFUSE_SPICONFIG_SPI_DEFAULTS 0
#define EFUSE_SPICONFIG_HSPI_DEFAULTS 1
#define EFUSE_SPICONFIG_RET_SPICLK_MASK 0x3f
#define EFUSE_SPICONFIG_RET_SPICLK_SHIFT 0
#define EFUSE_SPICONFIG_RET_SPICLK(ret) (((ret) >> EFUSE_SPICONFIG_RET_SPICLK_SHIFT) & EFUSE_SPICONFIG_RET_SPICLK_MASK)
#define EFUSE_SPICONFIG_RET_SPIQ_MASK 0x3f
#define EFUSE_SPICONFIG_RET_SPIQ_SHIFT 6
#define EFUSE_SPICONFIG_RET_SPIQ(ret) (((ret) >> EFUSE_SPICONFIG_RET_SPIQ_SHIFT) & EFUSE_SPICONFIG_RET_SPIQ_MASK)
#define EFUSE_SPICONFIG_RET_SPID_MASK 0x3f
#define EFUSE_SPICONFIG_RET_SPID_SHIFT 12
#define EFUSE_SPICONFIG_RET_SPID(ret) (((ret) >> EFUSE_SPICONFIG_RET_SPID_SHIFT) & EFUSE_SPICONFIG_RET_SPID_MASK)
#define EFUSE_SPICONFIG_RET_SPICS0_MASK 0x3f
#define EFUSE_SPICONFIG_RET_SPICS0_SHIFT 18
#define EFUSE_SPICONFIG_RET_SPICS0(ret) (((ret) >> EFUSE_SPICONFIG_RET_SPICS0_SHIFT) & EFUSE_SPICONFIG_RET_SPICS0_MASK)
#define EFUSE_SPICONFIG_RET_SPIHD_MASK 0x3f
#define EFUSE_SPICONFIG_RET_SPIHD_SHIFT 24
#define EFUSE_SPICONFIG_RET_SPIHD(ret) (((ret) >> EFUSE_SPICONFIG_RET_SPIHD_SHIFT) & EFUSE_SPICONFIG_RET_SPIHD_MASK)
/**
* @brief A crc8 algorithm used in efuse check.
*
* @param unsigned char const *p : Pointer to original data.
*
* @param unsigned int len : Data length in byte.
*
* @return unsigned char: Crc value.
*/
unsigned char esp_crc8(unsigned char const *p, unsigned int len);
/**
* @}
*/
#ifdef __cplusplus
}
#endif
#endif /* _ROM_EFUSE_H_ */