Add counter demo for Arty

Signed-off-by: Joanna Brozek <jbrozek@antmicro.com>

examples/xc7/counter_test/Makefile

@@ -2,13 +2,19 @@ mkfile_path := $(abspath $(lastword $(MAKEFILE_LIST)))
 current_dir := $(patsubst %/,%,$(dir $(mkfile_path)))
 TOP:=top
 VERILOG:=${current_dir}/counter.v
-PARTNAME:= xc7a35tcpg236-1
 DEVICE  := xc7a50t_test
 BITSTREAM_DEVICE := artix7
-PCF:=${current_dir}/basys3.pcf
-SDC:=${current_dir}/basys3.sdc
+SDC:=${current_dir}/counter.sdc
 BUILDDIR:=build
 
+ifeq ($(TARGET),arty)
+  PARTNAME := xc7a35tcsg324-1
+  PCF:=${current_dir}/arty.pcf
+else
+  PARTNAME:= xc7a35tcpg236-1
+  PCF:=${current_dir}/basys3.pcf
+endif
+
 all: ${BUILDDIR}/${TOP}.bit
 
 ${BUILDDIR}:

examples/xc7/counter_test/arty.pcf

@@ -0,0 +1,12 @@
+# 100 MHz CLK
+set_io clk E3
+
+# UART
+set_io rx A9
+set_io tx D10
+
+# LEDs
+set_io led[0] H5
+set_io led[1] J5
+set_io led[2] T9
+set_io led[3] T10

examples/xc7/counter_test/basys3.pcf

@@ -3,39 +3,9 @@ set_io clk W5
 
 set_io tx A18
 set_io rx B18
-#
-# in[0:15] correspond with SW0-SW15 on the basys3
-set_io sw[0] V17
-set_io sw[1] V16
-set_io sw[2] W16
-set_io sw[3] W17
-set_io sw[4] W15
-set_io sw[5] V15
-set_io sw[6] W14
-set_io sw[7] W13
-set_io sw[8] V2
-set_io sw[9] T3
-set_io sw[10] T2
-set_io sw[11] R3
-set_io sw[12] W2
-set_io sw[13] U1
-set_io sw[14] T1
-set_io sw[15] R2
 
 # out[0:15] correspond with LD0-LD15 on the basys3
 set_io led[0] U16
 set_io led[1] E19
 set_io led[2] U19
 set_io led[3] V19
-set_io led[4] W18
-set_io led[5] U15
-set_io led[6] U14
-set_io led[7] V14
-set_io led[8] V13
-set_io led[9] V3
-set_io led[10] W3
-set_io led[11] U3
-set_io led[12] P3
-set_io led[13] N3
-set_io led[14] P1
-set_io led[15] L1

examples/xc7/counter_test/counter.v

@@ -2,8 +2,7 @@ module top (
     input  clk,
     input rx,
     output tx,
-    input [15:0] sw,
-    output [15:0] led
+    output [3:0] led
 );
 
     localparam BITS = 4;
@@ -19,7 +18,5 @@ module top (
     end
 
     assign led[3:0] = counter >> LOG2DELAY;
-    assign led[14:4] = sw[14:4];
     assign tx = rx;
-    assign led[15] = ^sw;
 endmodule