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Transverter frequency shift logic. Implemented it for RTLSDR

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This commit is contained in:
f4exb
2017-09-23 19:15:56 +02:00
parent 83f9705e96
commit 43a1e0e14b
10 changed files with 97 additions and 22 deletions
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plugins/samplesource/rtlsdr/rtlsdrinput.cpp
+37 -8
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@@ -32,6 +32,15 @@ MESSAGE_CLASS_DEFINITION(RTLSDRInput::MsgConfigureRTLSDR, Message)
MESSAGE_CLASS_DEFINITION(RTLSDRInput::MsgReportRTLSDR, Message)
MESSAGE_CLASS_DEFINITION(RTLSDRInput::MsgFileRecord, Message)
const quint64 RTLSDRInput::frequencyLowRangeMin = 1000UL;
const quint64 RTLSDRInput::frequencyLowRangeMax = 275000UL;
const quint64 RTLSDRInput::frequencyHighRangeMin = 24000UL;
const quint64 RTLSDRInput::frequencyHighRangeMax = 1900000UL;
const int RTLSDRInput::sampleRateLowRangeMin = 230000U;
const int RTLSDRInput::sampleRateLowRangeMax = 300000U;
const int RTLSDRInput::sampleRateHighRangeMin = 950000U;
const int RTLSDRInput::sampleRateHighRangeMax = 2400000U;
RTLSDRInput::RTLSDRInput(DeviceSourceAPI *deviceAPI) :
m_deviceAPI(deviceAPI),
m_settings(),
@@ -354,35 +363,43 @@ bool RTLSDRInput::applySettings(const RTLSDRSettings& settings, bool force)
}
}
qint64 deviceCenterFrequency = m_settings.m_centerFrequency;
qint64 f_img = deviceCenterFrequency;
quint32 devSampleRate =m_settings.m_devSampleRate;
if (force || (m_settings.m_centerFrequency != settings.m_centerFrequency)
|| (m_settings.m_fcPos != settings.m_fcPos))
|| (m_settings.m_fcPos != settings.m_fcPos)
|| (m_settings.m_transverterMode != settings.m_transverterMode)
|| (m_settings.m_transverterDeltaFrequency != settings.m_transverterDeltaFrequency))
{
m_settings.m_centerFrequency = settings.m_centerFrequency;
m_settings.m_transverterMode = settings.m_transverterMode;
m_settings.m_transverterDeltaFrequency = settings.m_transverterDeltaFrequency;
qint64 deviceCenterFrequency = m_settings.m_centerFrequency;
deviceCenterFrequency -= m_settings.m_transverterMode ? m_settings.m_transverterDeltaFrequency : 0;
qint64 f_img = deviceCenterFrequency;
quint32 devSampleRate = m_settings.m_devSampleRate;
forwardChange = true;
if ((m_settings.m_log2Decim == 0) || (settings.m_fcPos == RTLSDRSettings::FC_POS_CENTER))
{
deviceCenterFrequency = m_settings.m_centerFrequency;
f_img = deviceCenterFrequency;
}
else
{
if (settings.m_fcPos == RTLSDRSettings::FC_POS_INFRA)
{
deviceCenterFrequency = m_settings.m_centerFrequency + (devSampleRate / 4);
deviceCenterFrequency += (devSampleRate / 4);
f_img = deviceCenterFrequency + devSampleRate/2;
}
else if (settings.m_fcPos == RTLSDRSettings::FC_POS_SUPRA)
{
deviceCenterFrequency = m_settings.m_centerFrequency - (devSampleRate / 4);
deviceCenterFrequency -= (devSampleRate / 4);
f_img = deviceCenterFrequency - devSampleRate/2;
}
}
deviceCenterFrequency = deviceCenterFrequency < 0 ? 0 : deviceCenterFrequency;
if (m_dev != 0)
{
if (rtlsdr_set_center_freq( m_dev, deviceCenterFrequency ) != 0)
@@ -411,6 +428,18 @@ bool RTLSDRInput::applySettings(const RTLSDRSettings& settings, bool force)
}
}
if ((m_settings.m_noModMode != settings.m_noModMode) || force)
{
m_settings.m_noModMode = settings.m_noModMode;
// Direct Modes: 0: off, 1: I, 2: Q, 3: NoMod.
if (m_settings.m_noModMode) {
set_ds_mode(3);
} else {
set_ds_mode(0);
}
}
if (forwardChange)
{
int sampleRate = m_settings.m_devSampleRate/(1<<m_settings.m_log2Decim);