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