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/* -*- mode: C++; tab-width: 4 -*- */
/* ===================================================================== *\
Copyright (c) 2000-2001 Palm, Inc. or its subsidiaries.
All rights reserved.
This file is part of the Palm OS Emulator.
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 2 of the License, or
(at your option) any later version.
\* ===================================================================== */
#include "EmCommon.h"
#include "EmSPISlave330Current.h"
#include "Logging.h"
#define PRINTF if (1) ; else LogAppendMsg
/*****************************************************************************
* The HandEra 330 includes a battery current sense. It is switched in and
* out of channel 2 of the ADC.
****************************************************************************/
// ---------------------------------------------------------------------------
// ¥ EmSPISlave330Current::EmSPISlave330Current
// ---------------------------------------------------------------------------
EmSPISlave330Current::EmSPISlave330Current () :
EmSPISlave (),
fBitBufferIn (0),
fBitBufferOut (0),
fNumBitsIn (0),
fPendingResult (0),
fHavePending (false),
fCommandBitsSeen (0),
fPowerConnected(false)
{
}
// ---------------------------------------------------------------------------
// ¥ EmSPISlave330Current::~EmSPISlave330Current
// ---------------------------------------------------------------------------
EmSPISlave330Current::~EmSPISlave330Current (void)
{
}
// ---------------------------------------------------------------------------
// ¥ EmSPISlave330Current::DoExchange
// ---------------------------------------------------------------------------
uint16 EmSPISlave330Current::DoExchange (uint16 control, uint16 data)
{
PRINTF ("");
PRINTF ("EmSPISlave330Current::DoExchange");
PRINTF ("control = 0x%04X, data = 0x%04X", control, data);
// -----------------------------------------------------------------------
// Merge the incoming bits with our current buffer.
// -----------------------------------------------------------------------
uint16 numBits = (control & hwrVZ328SPIMControlBitsMask) + 1;
uint32 oldBitsMask = ~0 << numBits;
uint32 newBitsMask = ~oldBitsMask;
PRINTF ("Before merging input: fBitBufferIn = 0x%04X, fNumBitsIn = 0x%04X", fBitBufferIn, fNumBitsIn);
fBitBufferIn = ((fBitBufferIn << numBits) & oldBitsMask) | (data & newBitsMask);
fNumBitsIn += numBits;
PRINTF ("After merging input: fBitBufferIn = 0x%04X, fNumBitsIn = 0x%04X", fBitBufferIn, fNumBitsIn);
// -----------------------------------------------------------------------
// Start processing the command bits.
// -----------------------------------------------------------------------
EmAssert (fNumBitsIn - fCommandBitsSeen - 1 >= 0);
uint16 result = 0;
uint32 mask = 1 << (fNumBitsIn - fCommandBitsSeen - 1);
while (mask)
{
// Shift out a bit.
{
result = (result << 1) | (fBitBufferOut >> 15);
fBitBufferOut <<= 1;
}
// If we haven't seen the Start bit yet, look for it.
if (fCommandBitsSeen == 0)
{
// If we found the Start bit, start counting the
// number of command bits as we stream through them.
if ((mask & fBitBufferIn) != 0)
{
fCommandBitsSeen++;
}
// Otherwise, adjust fNumBitsIn so that when we *do*
// find the Start bit, we know where it is.
else
{
fNumBitsIn--;
}
// If there's a pending conversion, load it into the
// output shift register after receiving the first
// bit after the last bit of the previous command.
this->LoadPendingConversion ();
}
else
{
fCommandBitsSeen++;
// If we've seen 8 bits, process the command, and then
// prepare for the next one.
if (fCommandBitsSeen == 8)
{
fNumBitsIn -= 8;
fCommandBitsSeen = 0;
uint8 command = fBitBufferIn >> fNumBitsIn;
this->ProcessCommand (command);
PRINTF ("After ProcessCommand: fPendingResult = 0x%04X", fPendingResult);
}
}
mask >>= 1;
}
// ----------------------------------------------------------------------
// Return the result.
// ----------------------------------------------------------------------
PRINTF ("result = 0x%04X", result);
return result;
}
// ---------------------------------------------------------------------------
// ¥ EmSPISlave330Current::ProcessCommand
// ---------------------------------------------------------------------------
void EmSPISlave330Current::ProcessCommand (uint8 command)
{
uint16 result = 0;
// we should only get here for channel 2
EmAssert (((command & kChannelBits) >> 4) == 2);
if (fPowerConnected)
result = 0; // no battery current with ext power connected.
else
result = 0x60; // just hard code some current for now.
fPendingResult = result << 4;
fHavePending = true;
}
// ---------------------------------------------------------------------------
// ¥ EmSPISlave330Current::LoadPendingConversion
// ---------------------------------------------------------------------------
void EmSPISlave330Current::LoadPendingConversion (void)
{
// -----------------------------------------------------------------------
// If there's a pending conversion, move it into the output shift register.
// -----------------------------------------------------------------------
if (fHavePending)
{
fHavePending = false;
fBitBufferOut = fPendingResult;
}
}
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