diff options
Diffstat (limited to 'ecp5')
| -rw-r--r-- | ecp5/synth/blinky.v | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/ecp5/synth/blinky.v b/ecp5/synth/blinky.v index 11ba5e4c..5327ab35 100644 --- a/ecp5/synth/blinky.v +++ b/ecp5/synth/blinky.v @@ -30,12 +30,32 @@ 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)); - reg [27:0] ctr = 0; + localparam ctr_width = 28; + reg [ctr_width-1:0] ctr = 0; always@(posedge clk) ctr <= ctr + 1'b1; - assign led = ctr[27:20]; + reg [9:0] brightness [0:7]; + + 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) + brightness[i] <= ctr[ctr_width-4:ctr_width-13]; + else + brightness[i] <= 0; + led_reg[i] <= ctr[9:0] < brightness[i]; + end + end + endgenerate + + assign led = led_reg; // Tie GPIO0, keep board from rebooting TRELLIS_SLICE #(.MODE("LOGIC"), .LUT0_INITVAL(16'hFFFF)) vcc (.F0(gpio0)); |