1 files changed, 107 insertions, 0 deletions
diff --git a/host/lib/rfnoc/null_block_ctrl_impl.cpp b/host/lib/rfnoc/null_block_ctrl_impl.cpp
new file mode 100644
index 000000000..7e62a2b3e
--- /dev/null
+++ b/host/lib/rfnoc/null_block_ctrl_impl.cpp
@@ -0,0 +1,107 @@
+//
+// Copyright 2014-2018 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+#include <uhd/utils/log.hpp>
+#include <uhd/types/ranges.hpp>
+#include <uhd/rfnoc/null_block_ctrl.hpp>
+#include <boost/format.hpp>
+
+using namespace uhd::rfnoc;
+
+class null_block_ctrl_impl : public null_block_ctrl
+{
+public:
+    UHD_RFNOC_BLOCK_CONSTRUCTOR(null_block_ctrl)
+    {
+        // Register hooks for line_rate:
+        _tree->access<int>(_root_path / "args" / 0 /  "line_rate" / "value")
+            .add_coerced_subscriber([this](const int delay){
+                this->set_line_delay_cycles(delay);
+            })
+            .update()
+        ;
+        // Register hooks for bpp:
+        _tree->access<int>(_root_path / "args" / 0 /  "bpp" / "value")
+            .add_coerced_subscriber([this](const int bpp){
+                this->set_bytes_per_packet(bpp);
+            })
+            .update()
+        ;
+    }
+
+    void set_line_delay_cycles(int cycles)
+    {
+        sr_write(SR_LINE_RATE, uint32_t(cycles));
+    }
+
+    void set_bytes_per_packet(int bpp)
+    {
+        sr_write(SR_LINES_PER_PACKET, uint32_t(bpp / BYTES_PER_LINE));
+    }
+
+    double set_line_rate(double rate, double clock_rate)
+    {
+        int cycs_between_lines = clock_rate / rate - 1;
+        if (cycs_between_lines > 0xFFFF) {
+            cycs_between_lines = 0xFFFF;
+            UHD_LOGGER_WARNING(unique_id())
+                << str(boost::format("Requested rate %f is larger than possible "
+                                     "with the current clock rate (%.2f MHz).")
+                       % rate % (clock_rate / 1e6))
+                << std::endl;
+        }
+        cycs_between_lines = std::max(0, cycs_between_lines);
+        set_arg<int>("line_rate", cycs_between_lines);
+        return _line_rate_from_reg_val(cycs_between_lines, clock_rate);
+    }
+
+    double get_line_rate(double clock_rate) const
+    {
+        return _line_rate_from_reg_val(get_arg<int>("line_rate"), clock_rate);
+    }
+
+    double _line_rate_from_reg_val(uint32_t reg_val, double clock_rate) const
+    {
+        return clock_rate / (reg_val + 1);
+    }
+
+    void issue_stream_cmd(const uhd::stream_cmd_t &stream_cmd, const size_t)
+    {
+        if (not stream_cmd.stream_now) {
+            throw uhd::not_implemented_error("null_block does not support timed commands.");
+        }
+        switch (stream_cmd.stream_mode) {
+            case uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS:
+                sr_write(SR_ENABLE_STREAM, true);
+                break;
+
+            case uhd::stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS:
+                sr_write(SR_ENABLE_STREAM, false);
+                break;
+
+            case uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE:
+            case uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_MORE:
+                throw uhd::not_implemented_error("null_block does not support streaming modes other than CONTINUOUS");
+
+            default:
+                UHD_THROW_INVALID_CODE_PATH();
+        }
+    }
+
+    void set_destination(
+            uint32_t next_address,
+            size_t output_block_port
+    ) {
+        uhd::sid_t sid(next_address);
+        if (sid.get_src() == 0) {
+            sid.set_src(get_address());
+        }
+        sr_write(SR_NEXT_DST_SID, sid.get(), output_block_port);
+    }
+};
+
+UHD_RFNOC_BLOCK_REGISTER(null_block_ctrl, "NullSrcSink");
+