URL
https://opencores.org/ocsvn/aemb/aemb/trunk
Subversion Repositories aemb
[/] [aemb/] [trunk/] [sw/] [cc/] [memtest.hh] - Rev 207
Go to most recent revision | Compare with Previous | Blame | View Log
/* $Id: memtest.hh,v 1.8 2008-06-24 10:03:41 sybreon Exp $
**
** MEMORY TEST FUNCTIONS
** Copyright (C) 2008 Shawn Tan <shawn.tan@aeste.net>
**
** This file is part of AEMB.
**
** AEMB is free software: you can redistribute it and/or modify it
** under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
** (at your option) any later version.
**
** AEMB 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 General Public
** License for more details.
**
** You should have received a copy of the GNU General Public License
** along with AEMB. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MEMTEST_HH
#define MEMTEST_HH
#ifdef __cplusplus
extern "C" {
#endif
/**
WALKING ONES TEST
Checks individual bit lines in O(1). Based on code at
http://www.embedded.com/2000/0007/0007feat1list1.htm
*/
static inline int memTestDataBus(int base)
{
volatile int *ram = (int *) base;
for (int i=1; i!=0; i<<=1)
{
*ram = i; // write test value
if (*ram != i) // read back test
return i;
}
return 0; // 0 if success
}
/**
POWERS OF TWO TEST
Checks the address lines. Based on code at
http://www.embedded.com/2000/0007/0007feat1list2.htm
*/
static inline int memTestAddrBus(int base, int len)
{
volatile int *ram = (int *) base;
const int p = 0xAAAAAAAA;
const int q = 0x55555555;
int nlen = (len / sizeof(int)) - 1;
//int nlen = (SRAM_SIZE / 4) - 1;
// prefill memory
for (int i=1; (i & nlen)!=0 ; i<<=1)
{
ram[i] = p;
}
// check 1 - stuck high
ram[0] = q;
for (int i=1; (i & nlen)!=0 ; i<<=1)
{
if (ram[i] != p)
return i;
}
// check 2 - stuck low
ram[0] = p;
for (int j=1; (j & nlen)!=0 ; j<<=1)
{
ram[j] = q;
for (int i=1; (i & nlen)!=0 ; i<<=1)
{
if ((ram[i] != p) && (i != j))
return i;
}
ram[j] = p;
}
return 0;
}
/**
INCREMENT TEST
Checks the entire memory device. Based on code at
http://www.embedded.com/2000/0007/0007feat1list3.htm
*/
static inline int memTestFullDev(int base, int len)
{
volatile int *ram = (int *) base;
int nlen = len / sizeof(int);
//int nlen = (SRAM_SIZE / 4);
// prefill the memory
for (int p=1, i=0; i<nlen; ++p, ++i)
{
ram[i] = p;
}
// pass 1 - check and invert
for (int p=1, i=0; i<nlen; ++p, ++i)
{
if (ram[i] != p)
return p;
ram[i] = ~p;
}
// pass 2 - check and zero
for (int p=1, i=0; i<nlen; ++p, ++i)
{
if (ram[i] != ~p)
return p;
ram[i] = 0;
}
return 0;
}
#ifdef __cplusplus
}
#endif
#endif
/*
$Log: not supported by cvs2svn $
Revision 1.7 2008/06/24 00:20:13 sybreon
changed parameters passed
Revision 1.6 2008/06/23 23:40:28 sybreon
*** empty log message ***
Revision 1.5 2008/06/23 22:28:00 sybreon
resized fulldev test
Revision 1.4 2008/06/23 22:08:39 sybreon
Renamed functions
Revision 1.3 2008/06/23 22:05:14 sybreon
*** empty log message ***
Revision 1.2 2008/06/21 10:01:35 sybreon
*** empty log message ***
Revision 1.1 2008/06/20 17:51:23 sybreon
initial import
*/
Go to most recent revision | Compare with Previous | Blame | View Log