Merged r9433:9527 from features/gr-usrp2 into trunk. Adds usrp2 and gr-usrp2 top-level components. Trunk passes distcheck with mb-gcc installed, but currently not without them. The key issue is that when mb-gcc is not installed, the build system skips over the usrp2/firmware directory, and the firmware include files don't get put into the dist tarball. But we can't do the usual DIST_SUBDIRS method as the firmware is a subpackage.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@9528 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 62 insertions, 0 deletions

diff --git a/usrp2/fpga/sdr_lib/dummy_rx.v b/usrp2/fpga/sdr_lib/dummy_rx.v
new file mode 100644
index 000000000..99290ecec
--- /dev/null
+++ b/usrp2/fpga/sdr_lib/dummy_rx.v
@@ -0,0 +1,62 @@
+
+`define DSP_CORE_RX_BASE 160
+module dummy_rx
+  (input clk, input rst,
+   input set_stb, input [7:0] set_addr, input [31:0] set_data,
+
+   input [13:0] adc_a, input adc_ovf_a,
+   input [13:0] adc_b, input adc_ovf_b,
+   
+   output [31:0] sample,
+   input run,
+   output strobe
+   );
+
+   wire [15:0] scale_i, scale_q;
+   wire [31:0] phase_inc;
+   reg [31:0]  phase;
+
+   wire [23:0] i_decim, q_decim;
+   wire [7:0]  decim_rate;
+   
+   setting_reg #(.my_addr(`DSP_CORE_RX_BASE+0)) sr_0
+     (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
+      .in(set_data),.out(phase_inc),.changed());
+   
+   setting_reg #(.my_addr(`DSP_CORE_RX_BASE+1)) sr_1
+     (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
+      .in(set_data),.out({scale_i,scale_q}),.changed());
+   
+   setting_reg #(.my_addr(`DSP_CORE_RX_BASE+2)) sr_2
+     (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
+      .in(set_data),.out(decim_rate),.changed());
+   
+   strobe_gen strobe_gen(.clock(clk),.reset(rst),.enable(run),.rate(decim_rate),
+			 .strobe_in(1),.strobe(strobe) );
+
+   reg [15:0] i_out, q_out;
+   assign      sample = {i_out,q_out};
+
+   always @(posedge clk)
+     if(rst)
+       i_out <= 0;
+     else if(~run)
+       i_out <= 0;
+     else if(strobe)
+       i_out <= i_out + 1;
+
+   reg 	       run_d1;
+   always @(posedge clk)
+     if(rst)
+       run_d1 <= 0;
+     else
+       run_d1 <= run;
+
+   always @(posedge clk)
+     if(rst)
+       q_out <= 0;
+     else if (run & ~run_d1)
+       q_out <= q_out + 1;
+       
+   
+endmodule // dsp_core_rx