Hamlib/microtune/i2cio_pp.cc

95 wiersze
2.2 KiB
C++

/* -*-C++-*-
*******************************************************************************
*
* File: i2cio_pp.cc
* Description:
*
*******************************************************************************
*/
/*
* Copyright 2001 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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 2, or (at your option)
* any later version.
*
* GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "i2cio_pp.h"
#include "microtune_eval_board_defs.h"
i2cio_pp::i2cio_pp (port_t *pp)
{
unsigned char r;
d_pp = pp;
par_lock (d_pp);
par_read_control (d_pp, &r);
par_write_control (d_pp, r & ~UT_CP_MUST_BE_ZERO); // output, no interrupts
par_unlock (d_pp);
}
void
i2cio_pp::set_scl (bool state)
{
unsigned char r;
par_read_control(d_pp, &r);
if (!state){ // active low
par_write_control (d_pp, r | UT_CP_TUNER_SCL);
}
else {
par_write_control (d_pp, r & ~UT_CP_TUNER_SCL);
}
par_read_control (d_pp, &r); // use for 1us delay
par_read_control (d_pp, &r); // use for 1us delay
}
void
i2cio_pp::set_sda (bool state)
{
unsigned char r;
par_read_data (d_pp, &r);
if (!state){ // active low
par_write_data (d_pp, r | UT_DP_TUNER_SDA_OUT);
}
else {
par_write_data (d_pp, r & ~UT_DP_TUNER_SDA_OUT);
}
par_read_data (d_pp, &r); // use for 1us delay
par_read_data (d_pp, &r); // use for 1us delay
}
bool
i2cio_pp::get_sda ()
{
unsigned char r;
par_read_status (d_pp, &r);
return (r & UT_SP_TUNER_SDA_IN) == 0; // eval board has an inverter on it
}
void
i2cio_pp::lock ()
{
par_lock (d_pp);
}
void
i2cio_pp::unlock ()
{
par_unlock (d_pp);
}