68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
#include "C64SerialSimulationDataGenerator.h"
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#include "C64SerialAnalyzerSettings.h"
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#include <AnalyzerHelpers.h>
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C64SerialSimulationDataGenerator::C64SerialSimulationDataGenerator()
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: mSerialText("My first analyzer, woo hoo!"), mStringIndex(0) {}
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C64SerialSimulationDataGenerator::~C64SerialSimulationDataGenerator() {}
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void C64SerialSimulationDataGenerator::Initialize(
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U32 simulation_sample_rate, C64SerialAnalyzerSettings *settings) {
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mSimulationSampleRateHz = simulation_sample_rate;
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mSettings = settings;
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mSerialSimulationData.SetChannel(mSettings->mDataChannel);
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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 C64SerialSimulationDataGenerator::GenerateSimulationData(
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U64 largest_sample_requested, U32 sample_rate,
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SimulationChannelDescriptor **simulation_channel) {
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U64 adjusted_largest_sample_requested =
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AnalyzerHelpers::AdjustSimulationTargetSample(
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largest_sample_requested, sample_rate, mSimulationSampleRateHz);
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while (mSerialSimulationData.GetCurrentSampleNumber() <
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adjusted_largest_sample_requested) {
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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 C64SerialSimulationDataGenerator::CreateSerialByte() {
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U32 samples_per_bit = mSimulationSampleRateHz / 15000;
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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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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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