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/******************************************************************************
* 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"
/* flash registers */
#define FLASH_BASE 0x40022000
#define FLASH_ACR FLASH_BASE
/* flash prefetcher */
#define ACR_PRFTBE BIT(4)
#define ACR_PRFTBE_ENABLE BIT(4)
/* flash wait states */
#define ACR_LATENCY (0x7)
#define FLASH_WRITE_ACR(val) __write(FLASH_ACR, val)
#define FLASH_READ_ACR() __read(FLASH_ACR)
/**
* @brief turn on the hardware prefetcher
*/
void flash_enable_prefetch(void) {
uint32 val = FLASH_READ_ACR();
val |= ACR_PRFTBE_ENABLE;
FLASH_WRITE_ACR(val);
}
/**
* @brief set flash wait states
* @param number of wait states
*/
void flash_set_latency(uint32 wait_states) {
uint32 val = FLASH_READ_ACR();
val &= ~ACR_LATENCY;
val |= wait_states;
FLASH_WRITE_ACR(val);
}
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