icestick bugfixes

icestick/build.sh

@@ -0,0 +1,8 @@
+
+yosys -p "synth_ice40 -blif stopwatch.blif" tb_icestick.v
+
+arachne-pnr -d 1k -p icestick.pcf stopwatch.blif -o stopwatch.txt
+
+icepack stopwatch.txt stopwatch.bin
+
+iceprog  stopwatch.bin

icestick/clockDividerIce.v

@@ -0,0 +1,26 @@
+module clockDividerIce (
+  input wire clk_in, // input clock 12 MHz
+  input wire ena,
+  input wire res,    // reset, active low
+  output reg clk_out // output clock 1 MHz
+);
+
+  reg[2:0] counter;
+  parameter div     = 6; // 12 MHz / 12 = 1 MHz, 50% duty cycle => 1/2 of that
+
+
+  always @(posedge clk_in) begin
+    if (!res) begin // reset
+      counter <= 3'b0;
+      clk_out <= 1'b0;
+    end else if (ena) begin
+      if (counter < (div-1)) begin    // count up
+        counter <= counter + 1;
+      end else begin                  // reset counter and invert output
+        counter <= 3'b0;
+        clk_out <= ~clk_out;
+      end
+    end
+  end
+
+endmodule //clockDividerIce

icestick/icestick.pcf

@@ -1,10 +1,10 @@
 set_io CLK_IN 21
 
-set_io o_stopwatch_enabled 95
-set_io o_display_enabled 96
-set_io o_mosi 97
-set_io o_cs 98
-set_io o_sck 99
+set_io l_stopwatch_enabled 95
+set_io l_display_enabled 96
+set_io l_mosi 97
+set_io l_cs 98
+set_io l_sck 99
 
 set_io i_board_reset 119
 set_io i_button_start_stop 118