/*
 * This file is part of the libopencm3 project.
 *
 * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
 * Copyright (C) 2010 Mark Butler <mbutler@physics.otago.ac.nz>
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <libopencm3/stm32/flash.h>

void flash_set_ws(uint32_t ws)
{
	uint32_t reg32;

	reg32 = FLASH_ACR;
	reg32 &= ~((1 << 0) | (1 << 1) | (1 << 2));
	reg32 |= ws;
	FLASH_ACR = reg32;
}

void flash_unlock(void)
{
	/* Clear the unlock sequence state. */
	FLASH_CR |= FLASH_CR_LOCK;

	/* Authorize the FPEC access. */
	FLASH_KEYR = FLASH_KEYR_KEY1;
	FLASH_KEYR = FLASH_KEYR_KEY2;
}

void flash_lock(void)
{
	FLASH_CR |= FLASH_CR_LOCK;
}

void flash_clear_pgperr_flag(void)
{
	FLASH_SR |= FLASH_SR_PGPERR;
}

void flash_clear_eop_flag(void)
{
	FLASH_SR |= FLASH_SR_EOP;
}

void flash_clear_bsy_flag(void)
{
	FLASH_SR &= ~FLASH_SR_BSY;
}


void flash_wait_for_last_operation(void)
{
	while ((FLASH_SR & FLASH_SR_BSY) == FLASH_SR_BSY);
}