/*
This file is part of JOP, the Java Optimized Processor
see <http://www.jopdesign.com/>
Copyright (C) 2001-2008, Martin Schoeberl (martin@jopdesign.com)
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
package util;
import com.jopdesign.sys.Const;
import com.jopdesign.sys.Native;
/**
* Flash programmer (for AMD Am29LV040).
* read and write data to address 0x80000.
*
* timing:
* byte program: typ 9 us max. 300 us
* sector erase: typ 0.7 s + 0.6 s max 15 s + 20 s
*
* asumes Timer.java is initialized
*/
public class Amd {
public static int read(int addr) {
return Native.rdMem(addr+0x80000);
}
/** program and handle timeout (without wd handling!) */
public static void program(int addr, int data) {
int i;
addr += 0x80000;
// Native.wr(0, Const.IO_INT_ENA);
Native.wrMem(0xaa, 0x80555);
Native.wrMem(0x55, 0x802aa);
Native.wrMem(0xa0, 0x80555);
Native.wrMem(data, addr);
int j = Native.rd(Const.IO_US_CNT);
j += 350; // maximum 350 us timeout
data &= 0xff;
for (;;) {
if (Native.rdMem(addr) == data) break;
if (j-Native.rd(Const.IO_US_CNT) < 0) break;
}
// Native.wr(1, Const.IO_INT_ENA);
}
/**
* erase one sector and handle wd.
*/
public static boolean erase(int addr) {
int i;
addr += 0x80000;
// Native.wr(0, Const.IO_INT_ENA);
Native.wrMem(0xaa, 0x80555);
Native.wrMem(0x55, 0x802aa);
Native.wrMem(0x80, 0x80555);
Native.wrMem(0xaa, 0x80555);
Native.wrMem(0x55, 0x802aa);
Native.wrMem(0x30, addr);
// Native.wr(1, Const.IO_INT_ENA);
for (i=0; i<400; ++i) { // maximum 40 s timeout
joprt.RtThread.sleepMs(100);
System.out.print('.');
Timer.wd();
if (Native.rdMem(addr) == 0xff) return true;
}
return false;
}
}