pavel/Quartus_blink
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Индекс частоты: 0..5 → 0,10,20,30,40,50 Гц english and 1Hz

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irobo 2026-05-13 18:04:55 +03:00
parent bbd177ba0b
commit 63426402c0
1 changed files with 33 additions and 14 deletions
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47
blink.v
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@ -10,25 +10,34 @@ module blink #(
//---------------------------------------------------------
// Step duration:
// - for 0 Hz : 8 s
// - for 0.5 Hz : 2 s
// - for others : 4 s
//---------------------------------------------------------
localparam integer STEP_4SEC_MAX = (F_CLK * 4) - 1;
localparam integer STEP_8SEC_MAX = (F_CLK * 8) - 1;
localparam integer STEP_2SEC_MAX = (F_CLK * 2) - 1;
localparam integer STEP_4SEC_MAX = (F_CLK * 4) - 1;
// Step timer counter
reg [31:0] step_cnt = 32'd0;
// Frequency index: 0..5 → 0,10,20,30,40,50 Hz
// Frequency index: 0..5 → 0, 10, 20, 30, 40, 50 Hz
reg [2:0] freq_idx = 3'd0;
// Half-period counter and current half-period length in clock cycles
reg [31:0] blink_cnt = 32'd0;
reg [31:0] max_count = 32'd0;
reg [31:0] blink_cnt = 32'd0;
reg [31:0] max_count = 32'd0;
// Base LED signal (before output inversions)
// Base LED signal (before output inversion)
reg led_base = 1'b0;
//---------------------------------------------------------
// 1 Hz generator for pin: divider from F_CLK
// Period 1 Hz = 1 s, half-period = 0.5 s
//---------------------------------------------------------
localparam integer PIN_1HZ_HALF_MAX = (F_CLK / 2) - 1;
reg [31:0] pin_cnt = 32'd0;
reg pin_base = 1'b0;
//---------------------------------------------------------
// Function to calculate half-period in clock cycles
//---------------------------------------------------------
@ -54,9 +63,9 @@ module blink #(
//---------------------------------------------------------
always @(posedge clk) begin
//-----------------------------------------------------
// Step timer: change frequency every 4 or 8 seconds
// Step timer: change frequency every 2 or 4 seconds
//-----------------------------------------------------
if (step_cnt >= (freq_idx == 3'd0 ? STEP_8SEC_MAX : STEP_4SEC_MAX)) begin
if (step_cnt >= (freq_idx == 3'd1 ? STEP_2SEC_MAX : STEP_4SEC_MAX)) begin
step_cnt <= 32'd0;
// Cycle through 0→1→2→3→4→5→0...
@ -74,7 +83,7 @@ module blink #(
max_count <= calc_max_count(freq_idx);
//-----------------------------------------------------
// Blink generation
// Blink generation for led
//-----------------------------------------------------
if (max_count == 32'd0) begin
// 0 Hz: hold current state, no blinking
@ -88,16 +97,26 @@ module blink #(
blink_cnt <= blink_cnt + 32'd1;
end
end
//-----------------------------------------------------
// 1 Hz generation for pin (independent of freq_idx)
//-----------------------------------------------------
if (pin_cnt >= PIN_1HZ_HALF_MAX) begin
pin_cnt <= 32'd0;
pin_base <= ~pin_base;
end else begin
pin_cnt <= pin_cnt + 32'd1;
end
end
//---------------------------------------------------------
// Outputs:
// led = inverted base signal
// pin = same as led
// led = inverted base signal (variable frequency)
// pin = 1 Hz
// pin_10 = inverted pin
//---------------------------------------------------------
assign led = ~led_base;
assign pin = led;
assign pin_10 = ~pin;
assign pin = pin_base;
assign pin_10 = led;
endmodule