CarryInSet added to bitstream gen, add counter tb

Signed-off-by: David Shah <davey1576@gmail.com>

ice40/bitstream.cc

@@ -174,6 +174,13 @@ void write_asc(const Context *ctx, std::ostream &out)
                 set_config(ti, config.at(y).at(x), "LC_" + std::to_string(z), lc.at(i), i);
             if (dff_enable)
                 set_config(ti, config.at(y).at(x), "NegClk", neg_clk);
+
+            bool carry_const = get_param_or_def(cell.second.get(), ctx->id("CIN_CONST"));
+            bool carry_set = get_param_or_def(cell.second.get(), ctx->id("CIN_SET"));
+            if (carry_const) {
+                assert(z == 0);
+                set_config(ti, config.at(y).at(x), "CarryInSet", carry_set);
+            }
         } else if (cell.second->type == ctx->id("SB_IO")) {
             const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_IO];
             unsigned pin_type = get_param_or_def(cell.second.get(), ctx->id("PIN_TYPE"));

ice40/carry_tests/.gitignore

@@ -1,2 +1,4 @@
 *.vcd
 *_out.v
+*.out
+

ice40/carry_tests/counter_tb.v

@@ -0,0 +1,23 @@
+module counter_tb;
+    reg clk;
+    always #5 clk = (clk === 1'b0);
+
+    wire outa, outb, outc, outd;
+
+    chip uut (
+        .clk(clk),
+        .cen(1'b1),
+        .rst(1'b0),
+        .outa(outa),
+        .outb(outb),
+        .outc(outc),
+	.outd(outd)
+    );
+
+    initial begin
+        $dumpfile("counter_tb.vcd");
+        $dumpvars(0, counter_tb);
+        repeat (100000) @(posedge clk);
+        $finish;
+    end
+endmodule

ice40/carry_tests/test.sh

@@ -2,15 +2,8 @@
 set -ex
 NAME=${1%.v}
 yosys -p "synth_ice40 -top top; write_json ${NAME}.json" $1
-../../nextpnr-ice40 --force --json ${NAME}.json --pcf test.pcf --asc ${NAME}.asc --verbose ../../python/dump_design.py
+../../nextpnr-ice40 --json ${NAME}.json --pcf test.pcf --asc ${NAME}.asc --verbose
-#icebox_vlog -p test.pcf ${NAME}.asc > ${NAME}_out.v
+icebox_vlog -p test.pcf ${NAME}.asc > ${NAME}_out.v
+iverilog -o ${NAME}_sim.out ${NAME}_tb.v ${NAME}_out.v 
+vvp ${NAME}_sim.out
 
-#yosys -p "read_verilog +/ice40/cells_sim.v;\
-#          rename chip gate;\
-#          read_verilog $1;\
-#          rename top gold;\
-#          hierarchy;\
-#          proc;\
-#          clk2fflogic;\
-#          miter -equiv -flatten -ignore_gold_x -make_outputs -make_outcmp gold gate miter;\
-#          sat -dump_vcd equiv_${NAME}.vcd -verify-no-timeout -timeout 60 -seq 50 -prove trigger 0 -prove-skip 1 -show-inputs -show-outputs miter" ${NAME}_out.v