Merge branch 'maint' into e300/clk_pps_updates

2 files changed, 23 insertions, 8 deletions

diff --git a/host/lib/usrp/common/ad9361_driver/ad9361_device.cpp b/host/lib/usrp/common/ad9361_driver/ad9361_device.cpp
index 7e574920a..97b214d7d 100644
--- a/host/lib/usrp/common/ad9361_driver/ad9361_device.cpp
+++ b/host/lib/usrp/common/ad9361_driver/ad9361_device.cpp
@@ -135,30 +135,39 @@ void ad9361_device_t::_program_fir_filter(direction_t direction, int num_taps, b
     _io_iface->poke8(base + 5, reg_numtaps | 0x1A);
     if (direction == RX) {
         _io_iface->poke8(base + 5, reg_numtaps | 0x18);
+        /* Rx Gain, set to prevent digital overflow/saturation in filters
+           0:+6dB, 1:0dB, 2:-6dB, 3:-12dB
+           page 35 of UG-671 */
         _io_iface->poke8(base + 6, 0x02); /* Also turn on -6dB Rx gain here, to stop filter overfow.*/
     } else {
-        _io_iface->poke8(base + 5, reg_numtaps | 0x19); /* Also turn on -6dB Tx gain here, to stop filter overfow.*/
+        /* Tx Gain. bit[0]. set to prevent digital overflow/saturation in filters
+           0: 0dB, 1:-6dB
+           page 25 of UG-671 */
+        _io_iface->poke8(base + 5, reg_numtaps | 0x18);
     }
 }
 
 
 /* Program the RX FIR Filter. */
-void ad9361_device_t::_setup_rx_fir(size_t num_taps, boost::int32_t interpolation)
+void ad9361_device_t::_setup_rx_fir(size_t num_taps, boost::int32_t decimation)
 {
+    if (not (decimation == 1 or decimation == 2 or decimation == 4)) {
+        throw uhd::runtime_error("[ad9361_device_t] Invalid Rx FIR decimation.");
+    }
     boost::scoped_array<boost::uint16_t> coeffs(new boost::uint16_t[num_taps]);
     for (size_t i = 0; i < num_taps; i++) {
         switch (num_taps) {
         case 128:
-            coeffs[i] = boost::uint16_t((interpolation==4) ? fir_128_x4_coeffs[i] : hb127_coeffs[i]);
+            coeffs[i] = boost::uint16_t((decimation==4) ? fir_128_x4_coeffs[i] : hb127_coeffs[i]);
             break;
         case 96:
-            coeffs[i] = boost::uint16_t((interpolation==4) ? fir_96_x4_coeffs[i] : hb95_coeffs[i]);
+            coeffs[i] = boost::uint16_t((decimation==4) ? fir_96_x4_coeffs[i] : hb95_coeffs[i]);
             break;
         case 64:
-            coeffs[i] = boost::uint16_t((interpolation==4) ? fir_64_x4_coeffs[i] : hb63_coeffs[i]);
+            coeffs[i] = boost::uint16_t((decimation==4) ? fir_64_x4_coeffs[i] : hb63_coeffs[i]);
             break;
         case 48:
-            coeffs[i] = boost::uint16_t((interpolation==4) ? fir_48_x4_coeffs[i] : hb47_coeffs[i]);
+            coeffs[i] = boost::uint16_t((decimation==4) ? fir_48_x4_coeffs[i] : hb47_coeffs[i]);
             break;
         default:
             throw uhd::runtime_error("[ad9361_device_t] Unsupported number of Rx FIR taps.");
@@ -171,11 +180,17 @@ void ad9361_device_t::_setup_rx_fir(size_t num_taps, boost::int32_t interpolatio
 /* Program the TX FIR Filter. */
 void ad9361_device_t::_setup_tx_fir(size_t num_taps, boost::int32_t interpolation)
 {
+    if (not (interpolation == 1 or interpolation == 2 or interpolation == 4)) {
+        throw uhd::runtime_error("[ad9361_device_t] Invalid Tx FIR interpolation.");
+    }
+    if (interpolation == 1 and num_taps > 64) {
+        throw uhd::runtime_error("[ad9361_device_t] Too many Tx FIR taps for interpolation value.");
+    }
     boost::scoped_array<boost::uint16_t> coeffs(new boost::uint16_t[num_taps]);
     for (size_t i = 0; i < num_taps; i++) {
         switch (num_taps) {
         case 128:
-	    coeffs[i] = boost::uint16_t((interpolation==4) ? fir_128_x4_coeffs[i] : hb127_coeffs[i]);
+            coeffs[i] = boost::uint16_t((interpolation==4) ? fir_128_x4_coeffs[i] : hb127_coeffs[i]);
             break;
         case 96:
             coeffs[i] = boost::uint16_t((interpolation==4) ? fir_96_x4_coeffs[i] : hb95_coeffs[i]);
diff --git a/host/lib/usrp/common/ad9361_driver/ad9361_device.h b/host/lib/usrp/common/ad9361_driver/ad9361_device.h
index fead90424..ca83f3037 100644
--- a/host/lib/usrp/common/ad9361_driver/ad9361_device.h
+++ b/host/lib/usrp/common/ad9361_driver/ad9361_device.h
@@ -74,7 +74,7 @@ public:
 private:    //Methods
     void _program_fir_filter(direction_t direction, int num_taps, boost::uint16_t *coeffs);
     void _setup_tx_fir(size_t num_taps, boost::int32_t interpolation);
-    void _setup_rx_fir(size_t num_taps, boost::int32_t interpolation);
+    void _setup_rx_fir(size_t num_taps, boost::int32_t decimation);
     void _calibrate_lock_bbpll();
     void _calibrate_synth_charge_pumps();
     double _calibrate_baseband_rx_analog_filter();