make button detection more reliable in standalone mode and add exit command

[proxmark3-svn] / fpga / testbed_lo_read.v

`include "lo_read.v"\r
/*\r
	pck0			- input main 24Mhz clock (PLL / 4)\r
	[7:0] adc_d		- input data from A/D converter\r
	lo_is_125khz	- input freq selector (1=125Khz, 0=136Khz)\r
\r
	pwr_lo			- output to coil drivers (ssp_clk / 8)\r
	adc_clk			- output A/D clock signal\r
	ssp_frame		- output SSS frame indicator (goes high while the 8 bits are shifted)\r
	ssp_din			- output SSP data to ARM (shifts 8 bit A/D value serially to ARM MSB first)\r
	ssp_clk			- output SSP clock signal 1Mhz/1.09Mhz (pck0 / 2*(11+lo_is_125khz) )\r
\r
	ck_1356meg		- input unused\r
	ck_1356megb		- input unused\r
	ssp_dout		- input unused\r
	cross_hi		- input unused\r
	cross_lo		- input unused\r
\r
	pwr_hi			- output unused, tied low\r
	pwr_oe1			- output unused, undefined\r
	pwr_oe2			- output unused, undefined\r
	pwr_oe3			- output unused, undefined\r
	pwr_oe4			- output unused, undefined\r
	dbg				- output alias for adc_clk\r
*/\r
\r
module testbed_lo_read;\r
	reg  pck0;\r
	reg  [7:0] adc_d;\r
	reg  lo_is_125khz;\r
	reg [15:0] divisor;\r
\r
	wire pwr_lo;\r
	wire adc_clk;\r
	wire ck_1356meg;\r
	wire ck_1356megb;\r
	wire ssp_frame;\r
	wire ssp_din;\r
	wire ssp_clk;\r
	reg ssp_dout;\r
	wire pwr_hi;\r
	wire pwr_oe1;\r
	wire pwr_oe2;\r
	wire pwr_oe3;\r
	wire pwr_oe4;\r
	wire cross_lo;\r
	wire cross_hi;\r
	wire dbg;\r
\r
	lo_read #(5,10) dut(\r
	.pck0(pck0),\r
	.ck_1356meg(ck_1356meg),\r
	.ck_1356megb(ck_1356megb),\r
	.pwr_lo(pwr_lo),\r
	.pwr_hi(pwr_hi),\r
	.pwr_oe1(pwr_oe1),\r
	.pwr_oe2(pwr_oe2),\r
	.pwr_oe3(pwr_oe3),\r
	.pwr_oe4(pwr_oe4),\r
	.adc_d(adc_d),\r
	.adc_clk(adc_clk),\r
	.ssp_frame(ssp_frame),\r
	.ssp_din(ssp_din),\r
	.ssp_dout(ssp_dout),\r
	.ssp_clk(ssp_clk),\r
	.cross_hi(cross_hi),\r
	.cross_lo(cross_lo),\r
	.dbg(dbg),\r
	.lo_is_125khz(lo_is_125khz),\r
	.divisor(divisor)\r
	);\r
\r
	integer idx, i, adc_val=8;\r
\r
	// main clock\r
	always #5 pck0 = !pck0;\r
\r
	task crank_dut;\r
	begin\r
		@(posedge adc_clk) ;\r
		adc_d = adc_val;\r
		adc_val = (adc_val *2) + 53;\r
	end\r
	endtask\r
\r
	initial begin\r
\r
		// init inputs\r
		pck0 = 0;\r
		adc_d = 0;\r
		ssp_dout = 0;\r
		lo_is_125khz = 1;\r
		divisor = 255;  //min 16, 95=125Khz, max 255\r
\r
		// simulate 4 A/D cycles at 125Khz\r
		for (i = 0 ;  i < 8 ;  i = i + 1) begin\r
			crank_dut;\r
		end\r
		$finish;\r
	end\r
endmodule // main\r