Get ice timing reporting working

rtl/.gitignore

@@ -1,3 +1,4 @@
 *.asc
 *.bin
 *.json
+*.rpt

rtl/Makefile

@@ -15,12 +15,13 @@ ${FN}.json: ${FN}.v
 ${FN}.asc: ${FN}.json ${FN}.pcf
 	nextpnr-ice40 ${NEXTPNR_OPTS} --pcf "${FN}.pcf" --json "${FN}.json" --asc "${FN}.asc"
 
-#${FN}.rpt: ${FN}.pcf ${FN}.txt
+${FN}.rpt: ${FN}.pcf ${FN}.asc
-#	icetime $ICETIME_OPTS -p "${FN}.pcf" -mtr "${FN}.rpt" "${FN}.txt"
+	icetime ${ICETIME_OPTS} -p "${FN}.pcf" -mtr "${FN}.rpt" "${FN}.asc"
 
 ${FN}.bin: ${FN}.asc
 	icepack ${FN}.asc ${FN}.bin
 
+timing: ${FN}.rpt
 
 clean:
 	rm ${FN}.json ${FN}.asc ${FN}.bin ${FN}_filled.bin

rtl/bldc.v

@@ -3,11 +3,11 @@ module bldc (
   output if_int
   );
 
-reg tmp = 0;
+reg [3:0] tmp = 0;
-assign if_int = tmp;
+assign if_int = tmp[3];
 
 always @(posedge clk) begin
-  tmp <= ~tmp;
+  tmp <= tmp + 1;
 end
 
 endmodule