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ZipCPU/wbmotor.v

Created January 6, 2020 22:43
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wbmotor.v
initial counts = 0;
always @(posedge i_clk)
if (i_reset)
// Tare the counter by setting it to zero on any reset
counts <= 0;
else begin
case({lst_a, lst_b, ck_a, ck_b})
4'h1: counts <= counts + 1'b1;
4'h7: counts <= counts + 1'b1;
4'he: counts <= counts + 1'b1;
4'h8: counts <= counts + 1'b1;
//
4'h4: counts <= counts - 1'b1;
4'hd: counts <= counts - 1'b1;
4'hb: counts <= counts - 1'b1;
4'h2: counts <= counts - 1'b1;
default: begin end // 0, 3, 5, 6, 9, a, c, f
endcase
end
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