Ice Sugar Pro PMod LED Example

blinky.v

`default_nettype none

module blinky(CLK, LED);
	input 	wire 			CLK;
	output 	wire 	[7:0]	LED;

	parameter 	WIDTH=25;

	reg 	[WIDTH-1:0]		counter;
	reg 	[7:0]			display;

	initial counter = 0;
	initial display = 8'b00000001;

	always @(posedge CLK)
	begin
		counter <= counter +1'b1;

		if (counter[WIDTH-1] == 1)
		begin
			// When the counter reaches top value shift the LEd accross one
			counter <= 0;
			if (display== 8'b10000000)
				display <= 8'b00000001;
			else
				display <= display << 1;
		end
	end

	assign LED = display;
endmodule

icesugarpro.pcf

LOCATE COMP "CLK" SITE "P6";
IOBUF PORT "CLK" IO_TYPE=LVCMOS33;

LOCATE COMP "LED[0]" SITE "T6";
LOCATE COMP "LED[1]" SITE "P7";
LOCATE COMP "LED[2]" SITE "R5";
LOCATE COMP "LED[3]" SITE "R6";
LOCATE COMP "LED[4]" SITE "R4";
LOCATE COMP "LED[5]" SITE "T4";
LOCATE COMP "LED[6]" SITE "R3";
LOCATE COMP "LED[7]" SITE "T3";

makefile

PROJ = blinky
PIN_DEF = icesugarpro.pcf
DEVICE = 25k
PACKAGE = CABGA256

build:
	yosys -p 'synth_ecp5 -top blinky -json $(PROJ).json' $(PROJ).v
	nextpnr-ecp5 --$(DEVICE) --package $(PACKAGE) --json $(PROJ).json --lpf  $(PIN_DEF) --textcfg $(PROJ).config --freq 100
	ecppack --compress --bit $(PROJ).bin $(PROJ).config

prog:
	ecpdap program --freq 5000 $(PROJ).bin

flash:
	ecpdap flash unprotect 
	ecpdap flash write --freq 5000 $(PROJ).bin 

clean:
	rm -f $(PROJ).json $(PROJ).asc $(PROJ).rpt $(PROJ).bin