Add icebreaker example project

examples/icebreaker/.gitignore

@@ -0,0 +1,4 @@
+example.asc
+example.bin
+example.blif
+example.rpt

examples/icebreaker/Makefile

@@ -0,0 +1,46 @@
+PROJ = example
+
+PIN_DEF = icebreaker.pcf
+DEVICE = up5k
+
+all: $(PROJ).rpt $(PROJ).bin
+
+%.blif: %.v
+	yosys -p 'synth_ice40 -top top -blif $@' $<
+
+%.asc: $(PIN_DEF) %.blif
+	arachne-pnr -d $(subst up,,$(subst hx,,$(subst lp,,$(DEVICE)))) -o $@ -p $^
+
+%.bin: %.asc
+	icepack $< $@
+
+%.rpt: %.asc
+	icetime -d $(DEVICE) -mtr $@ $<
+
+%_tb: %_tb.v %.v
+	iverilog -o $@ $^
+
+%_tb.vcd: %_tb
+	vvp -N $< +vcd=$@
+
+%_syn.v: %.blif
+	yosys -p 'read_blif -wideports $^; write_verilog $@'
+
+%_syntb: %_tb.v %_syn.v
+	iverilog -o $@ $^ `yosys-config --datdir/ice40/cells_sim.v`
+
+%_syntb.vcd: %_syntb
+	vvp -N $< +vcd=$@
+
+prog: $(PROJ).bin
+	iceprog $<
+
+sudo-prog: $(PROJ).bin
+	@echo 'Executing prog as root!!!'
+	sudo iceprog $<
+
+clean:
+	rm -f $(PROJ).blif $(PROJ).asc $(PROJ).rpt $(PROJ).bin
+
+.SECONDARY:
+.PHONY: all prog clean

examples/icebreaker/example.v

@@ -0,0 +1,39 @@
+module top (
+	input  CLK,
+
+	output LED1,
+	output LED2,
+	output LED3,
+	output LED4,
+	output LED5,
+
+	input BTN_N,
+	input BTN1,
+	input BTN2,
+	input BTN3,
+
+	output LEDR_N,
+	output LEDG_N,
+
+	output P1A1, P1A2, P1A3, P1A4, P1A7, P1A8, P1A9, P1A10,
+	output P1B1, P1B2, P1B3, P1B4, P1B7, P1B8, P1B9, P1B10
+);
+
+	localparam BITS = 5;
+	localparam LOG2DELAY = 22;
+
+	reg [BITS+LOG2DELAY-1:0] counter = 0;
+	reg [BITS-1:0] outcnt;
+
+	always @(posedge CLK) begin
+		counter <= counter + 1;
+		outcnt <= counter >> LOG2DELAY;
+	end
+
+	assign {LED1, LED2, LED3, LED4, LED5} = outcnt ^ (outcnt >> 1);
+
+	assign {LEDR_N, LEDG_N} = ~(!BTN_N + BTN1 + BTN2 + BTN3);
+
+	assign {P1A1, P1A2, P1A3, P1A4, P1A7, P1A8, P1A9, P1A10,
+			P1B1, P1B2, P1B3, P1B4, P1B7, P1B8, P1B9, P1B10} = 1 << (outcnt & 15);
+endmodule

examples/icebreaker/icebreaker.pcf

@@ -0,0 +1,64 @@
+# 12 MHz clock
+set_io -nowarn CLK        35
+
+# RS232
+set_io -nowarn RX          6
+set_io -nowarn TX          9
+
+# LEDs and Button
+set_io -nowarn BTN_N      10
+set_io -nowarn LEDR_N     11
+set_io -nowarn LEDG_N     37
+
+# RGB LED Driver
+set_io -nowarn LED_RED_N  39
+set_io -nowarn LED_GRN_N  40
+set_io -nowarn LED_BLU_N  41
+
+# SPI Flash
+set_io -nowarn FLASH_SCK  15
+set_io -nowarn FLASH_SSB  16
+set_io -nowarn FLASH_IO0  14
+set_io -nowarn FLASH_IO1  17
+set_io -nowarn FLASH_IO2  12
+set_io -nowarn FLASH_IO3  13
+
+# PMOD 1A
+set_io -nowarn P1A1        4
+set_io -nowarn P1A2        2
+set_io -nowarn P1A3       47
+set_io -nowarn P1A4       45
+set_io -nowarn P1A7        3
+set_io -nowarn P1A8       48
+set_io -nowarn P1A9       46
+set_io -nowarn P1A10      44
+
+# PMOD 1B
+set_io -nowarn P1B1       43
+set_io -nowarn P1B2       38
+set_io -nowarn P1B3       34
+set_io -nowarn P1B4       31
+set_io -nowarn P1B7       42
+set_io -nowarn P1B8       36
+set_io -nowarn P1B9       32
+set_io -nowarn P1B10      28
+
+# PMOD 2
+set_io -nowarn P2_1       27
+set_io -nowarn P2_2       25
+set_io -nowarn P2_3       21
+set_io -nowarn P2_4       19
+set_io -nowarn P2_7       26
+set_io -nowarn P2_8       23
+set_io -nowarn P2_9       20
+set_io -nowarn P2_10      18
+
+# LEDs and Buttons (PMOD 2)
+set_io -nowarn LED1       27
+set_io -nowarn LED2       25
+set_io -nowarn LED3       21
+set_io -nowarn BTN2       19
+set_io -nowarn LED5       26
+set_io -nowarn LED4       23
+set_io -nowarn BTN1       20
+set_io -nowarn BTN3       18