IceBreaker support

Author: pwmarcz

docs/fpga.md

@@ -60,6 +60,10 @@ For the TinyFPGA BX module, you need to set `BOARD=bx` flag:
 
     make flash V=blinky_bx.v BOARD=bx
 
+Same for the IceBreaker module:
+
+    make flash V=blinky_icebreaker.v BOARD=icebreaker
+
 (Append `USE_SUDO=1` if you need to use sudo).
 
 The build process has the following steps:
@@ -74,13 +78,15 @@ The build process has the following steps:
 
 ## Pins
 
-You can find the available pins in [pcf/icestick.pcf](https://github.com/pwmarcz/fpga-tools/blob/master/pcf/icestick.pcf) and
-[pcf/bx.pcf](https://github.com/pwmarcz/fpga-tools/blob/master/pcf/bx.pcf) files. Your module will reference these.
+You can find the available pins in
+[fpga-tools/pcf](https://github.com/pwmarcz/fpga-tools/tree/master/pcf) directory. Your module
+will need to reference these.
 
 Here are the pinouts for reference:
 
 - [iCEstick pinout](http://www.pighixxx.net/portfolio-items/icestick/)
 - [TinyFPGA BX pinout](https://www.crowdsupply.com/tinyfpga/tinyfpga-bx/updates/manufacturing-continues)
+- [IceBreaker pinout](https://raw.githubusercontent.com/icebreaker-fpga/icebreaker/master/img/icebreaker-v1_0b-legend.jpg)
 
 ## Ideas
 

docs/index.md

@@ -3,8 +3,8 @@ title: FPGA tutorial
 ---
 
 Here are some materials for my FPGA workshop. The workshop uses the open source
-Icestorm toolchain. The hardware is Icestick and TinyFPGA boards because that's
-what I have, as well as some peripherals like OLED displays.
+Icestorm toolchain. The hardware is a few Lattice boards (because that's what I
+have), as well as some peripherals like OLED displays.
 
 The code is MIT licensed (see LICENSE) unless otherwise stated in the
 file. Patches welcome!

verilog/blinky_icebreaker.v

@@ -0,0 +1,22 @@
+
+module top(input wire  CLK,
+           output wire LED1,
+           output wire LED2,
+           output wire LED3,
+           output wire LED4,
+           output wire LED5);
+
+  parameter n = 26;
+  reg [n-1:0] clk_counter = 0;
+
+  always @(posedge CLK) begin
+    clk_counter <= clk_counter + 1;
+  end
+
+  // Display 5 highest bits of counter with LEDs.
+  assign LED1 = clk_counter[n-5];
+  assign LED2 = clk_counter[n-4];
+  assign LED3 = clk_counter[n-3];
+  assign LED4 = clk_counter[n-2];
+  assign LED5 = clk_counter[n-1];
+endmodule