/******************************************************************************
 * The MIT License
 *
 * Copyright (c) 2010 Perry Hung.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *****************************************************************************/

/**
 * @brief flash peripheral management functions
 */

#include "libmaple.h"
#include "flash.h"
#include "bitband.h"

/**
 * @brief Turn on the hardware prefetcher.
 */
void flash_enable_prefetch(void) {
    *bb_perip(&FLASH_BASE->ACR, FLASH_ACR_PRFTBE_BIT) = 1;
}

/**
 * @brief Set flash wait states
 *
 * See ST PM0042, section 3.1 for restrictions on the acceptable value
 * of wait_states for a given SYSCLK configuration.
 *
 * @param wait_states number of wait states (one of
 *                    FLASH_WAIT_STATE_0, FLASH_WAIT_STATE_1,
 *                    FLASH_WAIT_STATE_2).
 */
void flash_set_latency(uint32 wait_states) {
    uint32 val = FLASH_BASE->ACR;

    val &= ~FLASH_ACR_LATENCY;
    val |= wait_states;

    FLASH_BASE->ACR = val;
}