/* $Id: memtest.hh,v 1.5 2008-06-23 22:28:00 sybreon Exp $
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/* $Id: memtest.hh,v 1.6 2008-06-23 23:40:28 sybreon Exp $
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**
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**
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** MEMORY TEST FUNCTIONS
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** MEMORY TEST FUNCTIONS
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** Copyright (C) 2008 Shawn Tan
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** Copyright (C) 2008 Shawn Tan
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**
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**
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** This file is part of AEMB.
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** This file is part of AEMB.
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**
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**
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** AEMB is free software: you can redistribute it and/or modify it
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** AEMB is free software: you can redistribute it and/or modify it
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** under the terms of the GNU General Public License as published by
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** under the terms of the GNU General Public License as published by
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** the Free Software Foundation, either version 3 of the License, or
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** the Free Software Foundation, either version 3 of the License, or
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** (at your option) any later version.
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** (at your option) any later version.
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**
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**
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** AEMB is distributed in the hope that it will be useful, but WITHOUT
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** AEMB is distributed in the hope that it will be useful, but WITHOUT
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** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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** or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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** or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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** License for more details.
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** License for more details.
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**
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**
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** You should have received a copy of the GNU General Public License
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** You should have received a copy of the GNU General Public License
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** along with AEMB. If not, see .
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** along with AEMB. If not, see .
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*/
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*/
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#ifndef MEMTEST_HH
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#ifndef MEMTEST_HH
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#define MEMTEST_HH
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#define MEMTEST_HH
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#ifdef __cplusplus
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#ifdef __cplusplus
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extern "C" {
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extern "C" {
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#endif
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#endif
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/**
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/**
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WALKING ONES TEST
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WALKING ONES TEST
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Checks individual bit lines in O(1)
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Checks individual bit lines in O(1)
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http://www.embedded.com/2000/0007/0007feat1list1.htm
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http://www.embedded.com/2000/0007/0007feat1list1.htm
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*/
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*/
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inline int memTestDataBus(volatile int *ram)
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static inline int memTestDataBus(volatile int *ram)
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{
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{
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for (int i=1; i!=0; i<<=1)
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for (int i=1; i!=0; i<<=1)
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{
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{
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*ram = i; // write test value
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*ram = i; // write test value
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if (*ram != i) // read back test
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if (*ram != i) // read back test
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return i;
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return i;
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}
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}
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return 0; // 0 if success
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return 0; // 0 if success
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}
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}
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/**
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/**
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POWERS OF TWO TEST
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POWERS OF TWO TEST
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Checks the address lines
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Checks the address lines
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http://www.embedded.com/2000/0007/0007feat1list2.htm
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http://www.embedded.com/2000/0007/0007feat1list2.htm
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*/
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*/
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inline int memTestAddrBus(volatile int *ram, int len)
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static inline int memTestAddrBus(volatile int *ram, int len)
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{
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{
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const int p = 0xAAAAAAAA;
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const int p = 0xAAAAAAAA;
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const int q = 0x55555555;
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const int q = 0x55555555;
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int nlen = (len >> 2) - 1;
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int nlen = (len / sizeof(int)) - 1;
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// prefill memory
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// prefill memory
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for (int i=1; (i & nlen)!=0 ; i<<=1)
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for (int i=1; (i & nlen)!=0 ; i<<=1)
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{
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{
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ram[i] = p;
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ram[i] = p;
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}
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}
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// check 1 - stuck high
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// check 1 - stuck high
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ram[0] = q;
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ram[0] = q;
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for (int i=1; (i & nlen)!=0 ; i<<=1)
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for (int i=1; (i & nlen)!=0 ; i<<=1)
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{
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{
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if (ram[i] != p)
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if (ram[i] != p)
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return ram[i];
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return i;
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}
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}
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ram[0] = p;
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// check 2 - stuck low
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// check 2 - stuck low
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ram[0] = p;
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for (int j=1; (j & nlen)!=0 ; j<<=1)
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for (int j=1; (j & nlen)!=0 ; j<<=1)
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{
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{
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ram[j] = q;
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ram[j] = q;
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for (int i=1; (i & nlen)!=0 ; i<<=1)
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for (int i=1; (i & nlen)!=0 ; i<<=1)
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{
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{
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if ((ram[i] != p) && (i != j))
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if ((ram[i] != p) && (i != j))
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return ram[i];
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return i;
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}
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}
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ram[j] = p;
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ram[j] = p;
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}
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}
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return 0;
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return 0;
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}
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}
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/**
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/**
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INCREMENT TEST
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INCREMENT TEST
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Checks the entire memory device
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Checks the entire memory device
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http://www.embedded.com/2000/0007/0007feat1list1.htm
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http://www.embedded.com/2000/0007/0007feat1list1.htm
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*/
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*/
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inline int memTestFullDev(volatile int *ram, int len)
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static inline int memTestFullDev(volatile int *ram, int len)
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{
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{
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int nlen = len >> 2;
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int nlen = len / sizeof(int);
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// prefill the memory
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// prefill the memory
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for (int p=1, i=0; i
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for (int p=1, i=0; i
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{
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{
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ram[i] = p;
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ram[i] = p;
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}
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}
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// pass 1 - check and invert
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// pass 1 - check and invert
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for (int p=1, i=0; i
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for (int p=1, i=0; i
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{
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{
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if (ram[i] != p)
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if (ram[i] != p)
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return ram[i];
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return p;
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ram[i] = ~p;
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ram[i] = ~p;
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}
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}
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// pass 2 - check and zero
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// pass 2 - check and zero
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for (int p=1, i=0; i
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for (int p=1, i=0; i
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{
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{
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if (ram[i] != ~p)
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if (ram[i] != ~p)
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return ram[i];
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return p;
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ram[i] = 0;
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ram[i] = 0;
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}
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}
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return 0;
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return 0;
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}
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}
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#ifdef __cplusplus
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#ifdef __cplusplus
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}
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}
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#endif
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#endif
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#endif
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#endif
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/*
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/*
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$Log: not supported by cvs2svn $
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$Log: not supported by cvs2svn $
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Revision 1.5 2008/06/23 22:28:00 sybreon
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resized fulldev test
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Revision 1.4 2008/06/23 22:08:39 sybreon
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Revision 1.4 2008/06/23 22:08:39 sybreon
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Renamed functions
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Renamed functions
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Revision 1.3 2008/06/23 22:05:14 sybreon
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Revision 1.3 2008/06/23 22:05:14 sybreon
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*** empty log message ***
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*** empty log message ***
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Revision 1.2 2008/06/21 10:01:35 sybreon
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Revision 1.2 2008/06/21 10:01:35 sybreon
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*** empty log message ***
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*** empty log message ***
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Revision 1.1 2008/06/20 17:51:23 sybreon
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Revision 1.1 2008/06/20 17:51:23 sybreon
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initial import
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initial import
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*/
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*/
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