Example of Verilog code that can be used to implement blinking LEDs for a car's turn signals on an FPGA board:
Verillog Code:
module TurnSignals(
input wire clk,
input wire reset,
output wire left_led,
output wire right_led
);
reg [23:0] counter;
reg left_state, right_state;
// Blinking frequency control parameters
parameter BLINK_DELAY = 24'd500000; // Adjust this value to control blink speed
always @(posedge clk or posedge reset) begin
if (reset) begin
counter <= 0;
left_state <= 0;
right_state <= 0;
end else begin
counter <= counter + 1;
if (counter >= BLINK_DELAY) begin
counter <= 0;
left_state <= ~left_state;
right_state <= ~right_state;
end
end
end
assign left_led = left_state;
assign right_led = right_state;
endmodule
Explanation of the Code:
1. The module `TurnSignals` takes inputs `clk` and `reset` for clock and reset signals, respectively. It has two output wires `left_led` and `right_led` for the left and right turn signal LEDs.
2. The `counter` is a 24-bit register used to keep track of time and control the blinking frequency.
3. `left_state` and `right_state` are registers that store the current state of the left and right turn signal LEDs (on or off).
4. The `BLINK_DELAY` parameter determines the blinking speed. Adjust the value of `BLINK_DELAY` to control the blink speed. Higher values result in slower blinking.
5. The `always` block increments the `counter` on every positive clock edge, except when the reset signal is active. When the `counter` reaches or exceeds `BLINK_DELAY`, it resets the counter and toggles the `left_state` and `right_state` to create the blinking effect.
6. The `assign` statements assign the values of `left_state` and `right_state` to `left_led` and `right_led`, respectively, to control the turn signal LEDs.
Remember to connect the appropriate LEDs to the FPGA board pins assigned to `left_led` and `right_led` outputs.
Feel free to adjust the `BLINK_DELAY` value to achieve the desired blinking frequency.
