N310: Deactivate frontend components on radio shutdown

Make sure no active components are connected to the TX frontend during
next boot. This avoids configurations that could generate unwanted tones
during operations such as the Mykonos init cals.

Signed-off-by: mattprost <matt.prost@ni.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/host/lib/usrp/dboard/magnesium/magnesium_radio_control_cpld.cpp b/host/lib/usrp/dboard/magnesium/magnesium_radio_control_cpld.cpp
index a4decdaaa..2edfa50bd 100644
--- a/host/lib/usrp/dboard/magnesium/magnesium_radio_control_cpld.cpp
+++ b/host/lib/usrp/dboard/magnesium/magnesium_radio_control_cpld.cpp
@@ -294,3 +294,26 @@ void magnesium_radio_control_impl::_update_tx_freq_switches(const double freq,
         enable_lowband_mixer,
         magnesium_cpld_ctrl::ON);
 }
+
+void magnesium_radio_control_impl::_reset_tx_frontend(
+    const magnesium_cpld_ctrl::chan_sel_t chan_sel)
+{
+    RFNOC_LOG_TRACE("magnesium_radio_control_impl::_reset_tx_frontend()");
+
+    // Deactivate idle state frontend components
+    _cpld->set_tx_switches(chan_sel,
+        magnesium_cpld_ctrl::TX_SW1_SHUTDOWNTXSW1,
+        magnesium_cpld_ctrl::TX_SW2_TOTXFILTERLP3400MHZ,
+        magnesium_cpld_ctrl::TX_SW3_BYPASSPATHTOTRXSW,
+        magnesium_cpld_ctrl::LOWBAND_MIXER_PATH_SEL_BYPASS,
+        false, // disable lowband mixer
+        magnesium_cpld_ctrl::IDLE,
+        true);
+    _cpld->set_tx_atr_bits(chan_sel,
+        magnesium_cpld_ctrl::IDLE,
+        false, // disable LED
+        false, // disable PA
+        false, // disable AMP
+        true // enable Mykonos
+    );
+}