68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
|
#include "C64SerialSimulationDataGenerator.h"
|
||
|
|
#include "C64SerialAnalyzerSettings.h"
|
||
|
|
|
||
|
|
#include <AnalyzerHelpers.h>
|
||
|
|
|
||
|
|
C64SerialSimulationDataGenerator::C64SerialSimulationDataGenerator()
|
||
|
|
: mSerialText("My first analyzer, woo hoo!"), mStringIndex(0) {}
|
||
|
|
|
||
|
|
C64SerialSimulationDataGenerator::~C64SerialSimulationDataGenerator() {}
|
||
|
|
|
||
|
|
void C64SerialSimulationDataGenerator::Initialize(
|
||
|
|
U32 simulation_sample_rate, C64SerialAnalyzerSettings *settings) {
|
||
|
|
mSimulationSampleRateHz = simulation_sample_rate;
|
||
|
|
mSettings = settings;
|
||
|
|
|
||
|
|
mSerialSimulationData.SetChannel(mSettings->mDataChannel);
|
||
|
|
mSerialSimulationData.SetSampleRate(simulation_sample_rate);
|
||
|
|
mSerialSimulationData.SetInitialBitState(BIT_HIGH);
|
||
|
|
}
|
||
|
|
|
||
|
|
U32 C64SerialSimulationDataGenerator::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 C64SerialSimulationDataGenerator::CreateSerialByte() {
|
||
|
|
U32 samples_per_bit = mSimulationSampleRateHz / 15000;
|
||
|
|
|
||
|
|
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);
|
||
|
|
}
|