diff options
Diffstat (limited to 'ecp5/synth/blinky.v')
| -rw-r--r-- | ecp5/synth/blinky.v | 34 |
1 files changed, 24 insertions, 10 deletions
diff --git a/ecp5/synth/blinky.v b/ecp5/synth/blinky.v index 5327ab35..ac7c6ea3 100644 --- a/ecp5/synth/blinky.v +++ b/ecp5/synth/blinky.v @@ -1,13 +1,16 @@ -module top(input clk_pin, output [3:0] led_pin, output gpio0_pin); +module top(input clk_pin, input btn_pin, output [3:0] led_pin, output gpio0_pin); wire clk; wire [7:0] led; - + wire btn; wire gpio0; (* BEL="X0/Y35/PIOA" *) (* IO_TYPE="LVCMOS33" *) TRELLIS_IO #(.DIR("INPUT")) clk_buf (.B(clk_pin), .O(clk)); + (* BEL="X4/Y71/PIOA" *) (* IO_TYPE="LVCMOS33" *) + TRELLIS_IO #(.DIR("INPUT")) btn_buf (.B(btn_pin), .O(btn)); + (* BEL="X0/Y23/PIOC" *) (* IO_TYPE="LVCMOS33" *) TRELLIS_IO #(.DIR("OUTPUT")) led_buf_0 (.B(led_pin[0]), .I(led[0])); (* BEL="X0/Y23/PIOD" *) (* IO_TYPE="LVCMOS33" *) @@ -30,27 +33,38 @@ module top(input clk_pin, output [3:0] led_pin, output gpio0_pin); (* BEL="X0/Y62/PIOD" *) (* IO_TYPE="LVCMOS33" *) TRELLIS_IO #(.DIR("OUTPUT")) gpio0_buf (.B(gpio0_pin), .I(gpio0)); - localparam ctr_width = 28; + localparam ctr_width = 24; + localparam ctr_max = 2**ctr_width - 1; reg [ctr_width-1:0] ctr = 0; + reg [9:0] pwm_ctr = 0; + reg dir = 0; - always@(posedge clk) - ctr <= ctr + 1'b1; + always@(posedge clk) begin + ctr <= btn ? ctr : (dir ? ctr - 1'b1 : ctr + 1'b1); + if (ctr[ctr_width-1 : ctr_width-3] == 0 && dir == 1) + dir <= 1'b0; + else if (ctr[ctr_width-1 : ctr_width-3] == 7 && dir == 0) + dir <= 1'b1; + pwm_ctr <= pwm_ctr + 1'b1; + end reg [9:0] brightness [0:7]; - + localparam bright_max = 2**10 - 1; reg [7:0] led_reg; genvar i; generate for (i = 0; i < 8; i=i+1) begin always @ (posedge clk) begin - if (ctr[ctr_width-1 : ctr_width-3] > i) - brightness[i] <= 10'h3FF; - else if (ctr[ctr_width-1 : ctr_width-3] == i) + if (ctr[ctr_width-1 : ctr_width-3] == i) + brightness[i] <= bright_max; + else if (ctr[ctr_width-1 : ctr_width-3] == (i - 1)) brightness[i] <= ctr[ctr_width-4:ctr_width-13]; + else if (ctr[ctr_width-1 : ctr_width-3] == (i + 1)) + brightness[i] <= bright_max - ctr[ctr_width-4:ctr_width-13]; else brightness[i] <= 0; - led_reg[i] <= ctr[9:0] < brightness[i]; + led_reg[i] <= pwm_ctr < brightness[i]; end end endgenerate |