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/*
* Copyright 2007 Free Software Foundation, Inc.
*
* 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/>.
*/
#include "i2c.h"
#include "mdelay.h"
static const int EEPROM_PAGESIZE = 16;
bool
eeprom_write (int i2c_addr, int eeprom_offset, const void *buf, int len)
{
unsigned char cmd[2];
const unsigned char *p = (unsigned char *) buf;
// The simplest thing that could possibly work:
// all writes are single byte writes.
//
// We could speed this up using the page write feature,
// but we write so infrequently, why bother...
while (len-- > 0){
cmd[0] = eeprom_offset++;
cmd[1] = *p++;
bool r = i2c_write (i2c_addr, cmd, sizeof (cmd));
mdelay (10); // delay 10ms worst case write time
if (!r)
return false;
}
return true;
}
bool
eeprom_read (int i2c_addr, int eeprom_offset, void *buf, int len)
{
unsigned char *p = (unsigned char *) buf;
// We setup a random read by first doing a "zero byte write".
// Writes carry an address. Reads use an implicit address.
unsigned char cmd[1];
cmd[0] = eeprom_offset;
if (!i2c_write (i2c_addr, cmd, sizeof (cmd)))
return false;
while (len > 0){
// int n = std::min (len, MAX_EP0_PKTSIZE);
int n = len;
if (!i2c_read (i2c_addr, p, n))
return false;
len -= n;
p += n;
}
return true;
}
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