Add icemulti example

examples/icemulti/.gitignore

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+/app?.asc
+/app?.bin
+/app?.blif
+/config.bin

examples/icemulti/Makefile

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+prog: config.bin
+	sudo iceprog config.bin
+
+sudo-prog: config.bin
+	@echo 'Executing prog as root!!!'
+	sudo iceprog config.bin
+
+config.bin: app0.bin app1.bin app2.bin app3.bin
+	icemulti -v -A16 -p0 -o config.bin app0.bin app1.bin app2.bin app3.bin
+
+app%.bin: app%.v icestick.pcf
+	yosys -p "synth_ice40 -top top -blif $(basename $<).blif" $<
+	arachne-pnr -o $(basename $<).asc -d 1k -P tq144 -p icestick.pcf $(basename $<).blif
+	icetime -d hx1k -c 25 $(basename $<).asc
+	icepack $(basename $<).asc $(basename $<).bin
+
+clean:
+	rm -f app?.asc app?.bin app?.blif config.bin
+
+.PHONY: prog sudo-prog clean

examples/icemulti/README

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+
+A simple example for icemulti using the iCEstick dev board.
+
+Each of the four images blinks another LED. After 7 blinks
+the next image is loaded automatically.
+

examples/icemulti/app0.v

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+module top (
+	input  clk,
+	output LED1, LED2, LED3, LED4, LED5
+);
+	localparam LOG2DELAY = 22;
+
+	reg [LOG2DELAY-1:0] counter = 0;
+	reg [3:0] counter2 = 0;
+	reg state = 0;
+
+	always @(posedge clk) begin
+		counter <= counter + 1;
+		counter2 <= counter2 + !counter;
+		state <= state ^ !counter;
+	end
+
+	assign LED1 = state;
+	assign LED2 = 0;
+	assign LED3 = 0;
+	assign LED4 = 0;
+	assign LED5 = 1;
+
+	SB_WARMBOOT WB (
+		.BOOT(&counter2),
+		.S1(1'b 0),
+		.S0(1'b 1)
+	);
+endmodule

examples/icemulti/app1.v

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+module top (
+	input  clk,
+	output LED1, LED2, LED3, LED4, LED5
+);
+	localparam LOG2DELAY = 22;
+
+	reg [LOG2DELAY-1:0] counter = 0;
+	reg [3:0] counter2 = 0;
+	reg state = 0;
+
+	always @(posedge clk) begin
+		counter <= counter + 1;
+		counter2 <= counter2 + !counter;
+		state <= state ^ !counter;
+	end
+
+	assign LED1 = 0;
+	assign LED2 = state;
+	assign LED3 = 0;
+	assign LED4 = 0;
+	assign LED5 = 1;
+
+	SB_WARMBOOT WB (
+		.BOOT(&counter2),
+		.S1(1'b 1),
+		.S0(1'b 0)
+	);
+endmodule

examples/icemulti/app2.v

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+module top (
+	input  clk,
+	output LED1, LED2, LED3, LED4, LED5
+);
+	localparam LOG2DELAY = 22;
+
+	reg [LOG2DELAY-1:0] counter = 0;
+	reg [3:0] counter2 = 0;
+	reg state = 0;
+
+	always @(posedge clk) begin
+		counter <= counter + 1;
+		counter2 <= counter2 + !counter;
+		state <= state ^ !counter;
+	end
+
+	assign LED1 = 0;
+	assign LED2 = 0;
+	assign LED3 = state;
+	assign LED4 = 0;
+	assign LED5 = 1;
+
+	SB_WARMBOOT WB (
+		.BOOT(&counter2),
+		.S1(1'b 1),
+		.S0(1'b 1)
+	);
+endmodule

examples/icemulti/app3.v

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+module top (
+	input  clk,
+	output LED1, LED2, LED3, LED4, LED5
+);
+	localparam LOG2DELAY = 22;
+
+	reg [LOG2DELAY-1:0] counter = 0;
+	reg [3:0] counter2 = 0;
+	reg state = 0;
+
+	always @(posedge clk) begin
+		counter <= counter + 1;
+		counter2 <= counter2 + !counter;
+		state <= state ^ !counter;
+	end
+
+	assign LED1 = 0;
+	assign LED2 = 0;
+	assign LED3 = 0;
+	assign LED4 = state;
+	assign LED5 = 1;
+
+	SB_WARMBOOT WB (
+		.BOOT(&counter2),
+		.S1(1'b 0),
+		.S0(1'b 0)
+	);
+endmodule

examples/icemulti/icestick.pcf

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+# full iCEstick pinout:
+# http://www.pighixxx.com/test/portfolio-items/icestick/
+
+set_io --warn-no-port RX 9
+set_io --warn-no-port TX 8
+set_io LED1 99
+set_io LED2 98
+set_io LED3 97
+set_io LED4 96
+set_io LED5 95
+set_io clk 21