PlutoSDR: set FIR filter (1)

devices/plutosdr/deviceplutosdrbox.cpp

@@ -15,6 +15,7 @@
 ///////////////////////////////////////////////////////////////////////////////////
 
 #include <iostream>
+#include <sstream>
 #include <cstdio>
 #include <cstring>
 #include <regex>
@@ -396,5 +397,38 @@ bool DevicePlutoSDRBox::parseSampleRates(const std::string& rateStr, SampleRates
     }
 }
 
+void DevicePlutoSDRBox::set_filterBW(DeviceUse use, uint32_t intdec, uint32_t bw)
+{
+    SampleRates sampleRates;
+    std::ostringstream ostr;
+
+    uint32_t nbTaps;
+    float normalizedBW;
+
+    if (use == USE_RX)
+    {
+        if (!getRxSampleRates(sampleRates)) {
+            return;
+        }
+
+        uint32_t nbGroups = sampleRates.m_addaConnvRate / 16;
+        nbTaps = nbGroups*8 > 128 ? 128 : nbGroups*8;
+        normalizedBW = ((float) bw) / sampleRates.m_hb1Rate;
+        normalizedBW = normalizedBW < 0.1 ? 0.1 : normalizedBW > 0.9 ? 0.9 : normalizedBW;
+    }
+    else
+    {
+        if (!getTxSampleRates(sampleRates)) {
+            return;
+        }
+
+        uint32_t nbGroups = sampleRates.m_addaConnvRate / 16;
+        nbTaps = nbGroups*8 > 128 ? 128 : nbGroups*8;
+        nbTaps = intdec == 1 ? (nbTaps > 64 ? 64 : nbTaps) : nbTaps;
+        normalizedBW = ((float) bw) / sampleRates.m_hb1Rate;
+        normalizedBW = normalizedBW < 0.1 ? 0.1 : normalizedBW > 0.9 ? 0.9 : normalizedBW;
+    }
+}
+
 
 

devices/plutosdr/deviceplutosdrbox.h

@@ -31,6 +31,12 @@ public:
         DEVICE_TX
     } DeviceType;
 
+    typedef enum
+    {
+        USE_RX,
+        USE_TX
+    } DeviceUse;
+
     struct Sample {
         int16_t i;
         int16_t q;
@@ -51,7 +57,6 @@ public:
 
     void set_params(DeviceType devType, const std::vector<std::string> &params);
     bool get_param(DeviceType devType, const std::string &param, std::string &value);
-    void set_filter(const std::string &filterConfigStr);
     bool openRx();
     bool openTx();
     void closeRx();
@@ -74,6 +79,7 @@ public:
     char* txBufferFirst();
     bool getRxSampleRates(SampleRates& sampleRates);
     bool getTxSampleRates(SampleRates& sampleRates);
+    void set_filterBW(DeviceUse use, uint32_t intdec, uint32_t bw);
 
 private:
     struct iio_context *m_ctx;
@@ -87,6 +93,7 @@ private:
     bool m_valid;
 
     bool parseSampleRates(const std::string& rateStr, SampleRates& sampleRates);
+    void set_filter(const std::string &filterConfigStr);
 };
 
 #endif /* DEVICES_PLUTOSDR_DEVICEPLUTOSDRBOX_H_ */