mirror of https://gerrit.osmocom.org/libusrp
66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/* -*- c++ -*- */
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/*
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* Copyright 2006 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "eeprom_io.h"
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#include "i2c.h"
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#include "delay.h"
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// returns non-zero if successful, else 0
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unsigned char
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eeprom_read (unsigned char i2c_addr, unsigned char eeprom_offset,
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__xdata unsigned char *buf, unsigned char len)
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{
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// We setup a random read by first doing a "zero byte write".
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// Writes carry an address. Reads use an implicit address.
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static __xdata unsigned char cmd[1];
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cmd[0] = eeprom_offset;
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if (!i2c_write(i2c_addr, cmd, 1))
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return 0;
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return i2c_read(i2c_addr, buf, len);
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}
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#if 0
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// returns non-zero if successful, else 0
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unsigned char
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eeprom_write (unsigned char i2c_addr, unsigned char eeprom_offset,
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const xdata unsigned char *buf, unsigned char len)
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{
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static xdata unsigned char cmd[2];
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unsigned char ok;
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while (len-- > 0){
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cmd[0] = eeprom_offset++;
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cmd[1] = *buf++;
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ok = i2c_write(i2c_addr, cmd, 2);
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mdelay(10); // delay 10ms worst case write time
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if (!ok)
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return 0;
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}
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return 1;
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}
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#endif
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