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44 lines
1.1 KiB
44 lines
1.1 KiB
module top (input CLK, input [3:0] COLS, inout [3:0] ROWS, output [3:0] LEDS, output TACT_LED);
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// MODULE POOLS MATRIX KEYBOARD 4x4 WITH PERIOD ~1 SEC (FOR EACH ROW)
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// AND REDIRECTED COLUMNS TO RED LEDS
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// GREEN LED TOGGLES EVERY ONE SECOND (AS POOLING PERIOD)
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// NEED FOR CHECKING CONNECTION TO MATRIX 4x4 KEYBOARD
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// IF THERE IS NO KEY PRESSED, ALL RED LEDS ARE ON
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// IF SOME KEY PRESSED, SOME LED IS NOT ON IN ONE OF FOUR PERIODS
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// ETC
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reg [1:0] row_counter = 0;
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reg [23:0] period_counter = 0;
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reg [3:0] rows_out = 0;
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reg [3:0] rows_en = 0;
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wire [3:0] rows_in;
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parameter period = 24'd12000000;
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always @ ( posedge CLK ) begin
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if (period_counter == period) begin
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period_counter <= 0;
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rows_en <= (1<<row_counter);
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row_counter <= row_counter + 1;
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end
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else
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period_counter <= period_counter + 1;
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end
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assign TACT_LED = row_counter[0];
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assign LEDS = COLS;
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SB_IO #(
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.PIN_TYPE(6'b 1010_01),
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.PULLUP(1'b 0)
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) rows_io [3:0] (
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.PACKAGE_PIN(ROWS),
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.OUTPUT_ENABLE(rows_en),
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.D_OUT_0(rows_out),
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.D_IN_0(rows_in)
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);
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endmodule
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