27 Sep '15, 5pm

Mystery FPGA Circuit Feels the Pressure

You have an FPGA circuit and you want the user to interact with your circuit by pushing a button. Clearly, you need a button, right? Not so fast! [Clifford Wolf] recently found a mysterious effect that lets him detect when someone pushes on his iCEstick board . The video below shows the mystery circuit (which is just the stock iCEstick board), which appears to react any time you flex the PC board. The Verilog implements a simple ring oscillator (basically an inverter with its output tied to its input). Here’s an excerpt from his Verilog code: // ring oscillator wire [99:0] buffers_in, buffers_out; assign buffers_in = {buffers_out[98:0], chain_in}; assign chain_out = buffers_out[99]; assign chain_in = resetn ? !chain_out : 0; SB_LUT4 #( .LUT_INIT(16'd2) ) buffers [99:0] ( .O(buffers_out), .I0(buffers_in), .I1(1'b0), .I2(1'b0), .I3(1'b0) ); He compares the output frequency t...

Full article: http://hackaday.com/2015/09/27/mystery-fpga-circuit-feels...

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