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- /****************************************************************************
- * configs/esp32-core/include/board.h
- *
- * Copyright (C) 2016 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- #ifndef __CONFIGS_ESP32_CORE_INCLUDE_BOARD_H
- #define __CONFIGS_ESP32_CORE_INCLUDE_BOARD_H
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- /* Clocking ****************************************************************/
- /* The ESP32 Core board V2 is fitted with either a 26 a 40MHz crystal */
- #ifdef CONFIG_ESP32CORE_XTAL_26MHz
- # define BOARD_XTAL_FREQUENCY 26000000
- #else
- # define BOARD_XTAL_FREQUENCY 40000000
- #endif
- /* Clock reconfiguration is currently disabled, so the CPU will be running
- * at the XTAL frequency or at two times the XTAL frequency, depending upon
- * how we load the code:
- *
- * - If we load the code into FLASH at address 0x1000 where it is started by
- * the second level bootloader, then the frequency is the crystal
- * frequency.
- * - If we load the code into IRAM after the second level bootloader has run
- * this frequency will be twice the crystal frequency.
- *
- * Don't ask me for an explanation.
- */
- #ifdef CONFIG_ESP32CORE_RUN_IRAM
- # define BOARD_CLOCK_FREQUENCY (2 * BOARD_XTAL_FREQUENCY)
- #else
- # define BOARD_CLOCK_FREQUENCY BOARD_XTAL_FREQUENCY
- #endif
- #endif /* __CONFIGS_ESP32_CORE_INCLUDE_BOARD_H */
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