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/***********************************************************************************************************************
* DISCLAIMER
* This software is supplied by Renesas Electronics Corporation and is only
* intended for use with Renesas products. No other uses are authorized. This
* software is owned by Renesas Electronics Corporation and is protected under
* all applicable laws, including copyright laws.
* THIS SOFTWARE IS PROVIDED "AS IS" AND RENESAS MAKES NO WARRANTIES REGARDING
* THIS SOFTWARE, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING BUT NOT
* LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* AND NON-INFRINGEMENT. ALL SUCH WARRANTIES ARE EXPRESSLY DISCLAIMED.
* TO THE MAXIMUM EXTENT PERMITTED NOT PROHIBITED BY LAW, NEITHER RENESAS
* ELECTRONICS CORPORATION NOR ANY OF ITS AFFILIATED COMPANIES SHALL BE LIABLE
* FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR
* ANY REASON RELATED TO THIS SOFTWARE, EVEN IF RENESAS OR ITS AFFILIATES HAVE
* BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
* Renesas reserves the right, without notice, to make changes to this software
* and to discontinue the availability of this software. By using this software,
* you agree to the additional terms and conditions found by accessing the
* following link:
* http://www.renesas.com/disclaimer
*
* Copyright (C) 2014 Renesas Electronics Corporation. All rights reserved.
***********************************************************************************************************************/
/***********************************************************************************************************************
* System Name : RZ/T1 Init program
* File Name : r_ram_init.c
* Version : 0.1
* Device : R7S910018
* Abstract : API for internal extended RAM function
* Tool-Chain : GNUARM-NONEv14.02-EABI
* OS : not use
* H/W Platform : Renesas Starter Kit for RZ/T1(Preliminary)
* Description : internal extended RAM setting API of RZ/T1
* Limitation : none
***********************************************************************************************************************/
/***********************************************************************************************************************
* History : DD.MM.YYYY Version Description
* : 21.05.2015 1.00 First Release
***********************************************************************************************************************/
/***********************************************************************************************************************
Includes <System Includes> , "Project Includes"
***********************************************************************************************************************/
#include <stdint.h>
#include "iodefine.h"
#include "r_system.h"
#include "r_ram_init.h"
#include "r_typedefs.h"
/***********************************************************************************************************************
Macro definitions
***********************************************************************************************************************/
#define RAM_ECC_ENABLE (0x00000001)
#define RAM_ECC_DISABLE (0x00000000)
#define RAM_PROTECT (0x00000000)
/***********************************************************************************************************************
Typedef definitions
***********************************************************************************************************************/
/***********************************************************************************************************************
Imported global variables and functions (from other files)
***********************************************************************************************************************/
/***********************************************************************************************************************
Exported global variables and functions (to be accessed by other files)
***********************************************************************************************************************/
/***********************************************************************************************************************
Private variables and functions
***********************************************************************************************************************/
/***********************************************************************************************************************
* Function Name : R_RAM_ECCEnable
* Description : Enable ECC function for internal extended RAM.
* Arguments : none
* Return Value : none
***********************************************************************************************************************/
void R_RAM_ECCEnable(void)
{
/* Enables writing to the protected registers related to RAM function */
R_RAM_WriteEnable();
/* Enable ECC function */
ECCRAM.RAMEDC.LONG = RAM_ECC_ENABLE;
/* Disables writing to the protected registers related to RAM function */
R_RAM_WriteDisable();
}
/***********************************************************************************************************************
End of function R_RAM_ECCEnable
***********************************************************************************************************************/
/***********************************************************************************************************************
* Function Name : R_RAM_WriteEnable
* Description : Enable writing to the protected registers related to RAM.
* And dummy read the register in order to fix the register value.
* Arguments : none
* Return Value : none
***********************************************************************************************************************/
void R_RAM_WriteEnable(void)
{
volatile uint32_t dummy=0;
UNUSED_VARIABLE(dummy);
/* Special sequence for protect release */
ECCRAM.RAMPCMD.LONG = 0x000000A5; // Write fixed value 0x000000A5
ECCRAM.RAMPCMD.LONG = 0x00000001; // Write expected value
ECCRAM.RAMPCMD.LONG = 0x0000FFFE; // Write inverted value of the expected value
ECCRAM.RAMPCMD.LONG = 0x00000001; // Write expected value again
dummy = ECCRAM.RAMPCMD.LONG;
}
/***********************************************************************************************************************
End of function R_RAM_WriteEnable
***********************************************************************************************************************/
/***********************************************************************************************************************
* Function Name : R_RAM_WriteDisable
* Description : Disable writing to the protected registers related to RAM.
* And dummy read the register in order to fix the register value.
* Arguments : none
* Return Value : none
***********************************************************************************************************************/
void R_RAM_WriteDisable(void)
{
volatile uint32_t dummy=0;
UNUSED_VARIABLE(dummy);
/* Clear RAMPCMD register to zero */
ECCRAM.RAMPCMD.LONG = RAM_PROTECT;
dummy = ECCRAM.RAMPCMD.LONG;
}
/***********************************************************************************************************************
End of function R_RAM_WriteDisable
***********************************************************************************************************************/
/* End of File */
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