mirror of
https://github.com/gnss-sdr/gnss-sdr
synced 2024-06-30 17:03:15 +00:00
b849b20a8c
- Added a pre-compiled custom GN3S firmware. - Added a fully-compliant GNU Radio source block for GN3S USB dongle. It can be used also from GNU Radio companion and from Python applications. - Added a new GN3S_Signal_Source block. It is possible to disable the GN3S signal source compilation. See README. git-svn-id: https://svn.code.sf.net/p/gnss-sdr/code/trunk@217 64b25241-fba3-4117-9849-534c7e92360d
124 lines
2.6 KiB
C
124 lines
2.6 KiB
C
/* -*- c++ -*- */
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/*
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* Copyright 2003 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 2, 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "i2c.h"
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#include "fx2regs.h"
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#include <string.h>
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// issue a stop bus cycle and wait for completion
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// returns non-zero if successful, else 0
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unsigned char
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i2c_read (unsigned char addr, xdata unsigned char *buf, unsigned char len)
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{
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volatile unsigned char junk;
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if (len == 0) // reading zero bytes always works
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return 1;
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while (I2CS & bmSTOP) // wait for stop to clear
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;
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I2CS = bmSTART;
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I2DAT = (addr << 1) | 1; // write address and direction (1's the read bit)
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while ((I2CS & bmDONE) == 0)
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;
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if ((I2CS & bmBERR) || (I2CS & bmACK) == 0) // no device answered...
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goto fail;
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if (len == 1)
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I2CS |= bmLASTRD;
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junk = I2DAT; // trigger the first read cycle
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while (--len != 0){
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while ((I2CS & bmDONE) == 0)
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;
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if (I2CS & bmBERR)
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goto fail;
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if (len == 1)
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I2CS |= bmLASTRD;
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*buf++ = I2DAT; // get data, trigger another read
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}
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// wait for final byte
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while ((I2CS & bmDONE) == 0)
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;
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if (I2CS & bmBERR)
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goto fail;
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I2CS |= bmSTOP;
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*buf = I2DAT;
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return 1;
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fail:
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I2CS |= bmSTOP;
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return 0;
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}
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// returns non-zero if successful, else 0
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unsigned char
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i2c_write (unsigned char addr, xdata const unsigned char *buf, unsigned char len)
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{
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while (I2CS & bmSTOP) // wait for stop to clear
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;
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I2CS = bmSTART;
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I2DAT = (addr << 1) | 0; // write address and direction (0's the write bit)
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while ((I2CS & bmDONE) == 0)
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;
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if ((I2CS & bmBERR) || (I2CS & bmACK) == 0) // no device answered...
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goto fail;
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while (len > 0){
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I2DAT = *buf++;
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len--;
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while ((I2CS & bmDONE) == 0)
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;
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if ((I2CS & bmBERR) || (I2CS & bmACK) == 0) // no device answered...
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goto fail;
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}
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I2CS |= bmSTOP;
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return 1;
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fail:
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I2CS |= bmSTOP;
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return 0;
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}
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