saleae-iec-analyser/source/SimpleSerialSimulationDataG...

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#include "SimpleSerialSimulationDataGenerator.h"
#include "SimpleSerialAnalyzerSettings.h"
#include <AnalyzerHelpers.h>
SimpleSerialSimulationDataGenerator::SimpleSerialSimulationDataGenerator()
: mSerialText( "My first analyzer, woo hoo!" ),
mStringIndex( 0 )
{
}
SimpleSerialSimulationDataGenerator::~SimpleSerialSimulationDataGenerator()
{
}
void SimpleSerialSimulationDataGenerator::Initialize( U32 simulation_sample_rate, SimpleSerialAnalyzerSettings* settings )
{
mSimulationSampleRateHz = simulation_sample_rate;
mSettings = settings;
mSerialSimulationData.SetChannel( mSettings->mInputChannel );
mSerialSimulationData.SetSampleRate( simulation_sample_rate );
mSerialSimulationData.SetInitialBitState( BIT_HIGH );
}
U32 SimpleSerialSimulationDataGenerator::GenerateSimulationData( U64 largest_sample_requested, U32 sample_rate, SimulationChannelDescriptor** simulation_channel )
{
U64 adjusted_largest_sample_requested = AnalyzerHelpers::AdjustSimulationTargetSample( largest_sample_requested, sample_rate, mSimulationSampleRateHz );
while( mSerialSimulationData.GetCurrentSampleNumber() < adjusted_largest_sample_requested )
{
CreateSerialByte();
}
*simulation_channel = &mSerialSimulationData;
return 1;
}
void SimpleSerialSimulationDataGenerator::CreateSerialByte()
{
U32 samples_per_bit = mSimulationSampleRateHz / mSettings->mBitRate;
U8 byte = mSerialText[ mStringIndex ];
mStringIndex++;
if( mStringIndex == mSerialText.size() )
mStringIndex = 0;
//we're currenty high
//let's move forward a little
mSerialSimulationData.Advance( samples_per_bit * 10 );
mSerialSimulationData.Transition(); //low-going edge for start bit
mSerialSimulationData.Advance( samples_per_bit ); //add start bit time
U8 mask = 0x1 << 7;
for( U32 i=0; i<8; i++ )
{
if( ( byte & mask ) != 0 )
mSerialSimulationData.TransitionIfNeeded( BIT_HIGH );
else
mSerialSimulationData.TransitionIfNeeded( BIT_LOW );
mSerialSimulationData.Advance( samples_per_bit );
mask = mask >> 1;
}
mSerialSimulationData.TransitionIfNeeded( BIT_HIGH ); //we need to end high
//lets pad the end a bit for the stop bit:
mSerialSimulationData.Advance( samples_per_bit );
}