Initial commit

testbench/.gitignore

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+*.bin
+*.vcd

testbench/Makefile

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+VC  = iverilog
+VI  = vvp
+
+SOURCES = ../rtl/mcp3201.sv ../rtl/spi_sclk_gen.sv
+
+VFLAGS  = -g2012
+
+TBS = $(wildcard tb_*.sv)
+DEFINES = -D TESTBENCH
+VCDDEPS = $(TBS:.sv=.vcd)
+BINDEPS = $(TBS:.sv=.bin)
+
+all: $(VCDDEPS)
+
+.SECONDARY:
+#.SILENT: $(VCDDEPS) $(BINDEPS) clean
+
+%.vcd: %.bin
+	@echo "Simulate :" $(<:.bin=.sv)
+	$(VI) $< #> $(<:.bin=.out)
+
+%.bin: %.sv $(SOURCES)
+	@echo "Compile  :" $(@:.bin=.sv)
+	$(VC) $(VFLAGS) $(DEFINES) -D DUMPFILE=\"$(@:.bin=.vcd)\" -o $@ $< $(SOURCES)
+
+clean:
+	@echo "Remove *.bin, *.vcd, *.out"
+	rm -rf *.bin
+	rm -rf *.out
+	rm -rf *.vcd

testbench/tb_mcp3201.sv

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+`timescale 1ps/1ps
+
+module tb_mcp3201;
+    logic clock = 1'b0;
+    logic reset = 1'b1;
+
+    /* Master clock 10MHz (100ns period) */
+    always #(100ns/2) clock <= ~clock;
+
+    logic spi_clk;
+    logic spi_ssn;
+    logic spi_miso;
+
+    logic [11:0] data;
+    logic strb;
+
+    spi_sclk_gen #(.CLOCK_FREQ(10000000), .SCLK_FREQ(50000 * 17)) spi_clk_g
+      (.clock, .reset,
+       .sclk_o(spi_clk));
+
+    mcp3201 DUT
+      (.clock, .reset,
+       .spi_clk_i(spi_clk),
+       .spi_ssn_o(spi_ssn),
+       .spi_miso_i(spi_miso),
+       .data_o(data),
+       .strb_o(strb));
+
+    always_ff @ (posedge clock)
+      if (strb)
+        $display("%15b", data);
+
+    logic [14:0] ds;
+
+    initial begin
+        reset = 1'b1;
+        repeat(10) @(posedge clock);
+        reset = 1'b0;
+
+        /* Send word 0 */
+        wait(spi_ssn == 1'b0);
+
+        ds = 15'bzz0_1010_1010_1010;
+        for (int i = 0; i < 15; i ++) begin
+            @(negedge spi_clk) spi_miso = ds[14];
+            ds = ds << 1;
+        end
+
+        /* Send word 1 */
+        wait(spi_ssn == 1'b1);
+        wait(spi_ssn == 1'b0);
+
+        ds = 15'bzz0_0101_0101_0101;
+        for (int i = 0; i < 15; i ++) begin
+            @(negedge spi_clk) spi_miso = ds[14];
+            ds = ds << 1;
+        end
+
+        wait(spi_ssn == 1'b1);
+
+        repeat(10) @(posedge clock);
+        $finish;
+    end
+
+    initial begin
+        $dumpfile("tb_mcp3201.vcd");
+        $dumpvars;
+    end
+
+endmodule // tb_mcp3201