ベースとして使ったデザインはこちら
● codex に生成させたRTLコード
生成には，GPT-5.4を使った．
Verilog
module matrix_led_top (
input wire clk,
input wire USER_KEY,
output reg SIN1,
output reg SIN2,
output reg SIN3,
output reg LATCH,
output reg LED_CLK,
output reg STROBE_
);
localparam integer CLK_HZ = 50_000_000;
localparam integer DISPLAY_ROWS = 16;
localparam integer DISPLAY_COLS = 64;
localparam integer FONT_W = 8;
localparam integer FONT_H = 8;
localparam integer CHAR_STRIDE = 9;
localparam integer MSG_LEN = 28;
localparam integer TEXT_COLUMNS = MSG_LEN * CHAR_STRIDE;
localparam integer SCROLL_SPAN = TEXT_COLUMNS + DISPLAY_COLS;
localparam integer SCROLL_TICK_CYC = CLK_HZ / 10;
localparam integer BASE_ON_TICKS = 5_000;
localparam integer STATE_LOAD = 0;
localparam integer STATE_SHIFT_SETUP = 1;
localparam integer STATE_SHIFT_HIGH = 2;
localparam integer STATE_SHIFT_LOW = 3;
localparam integer STATE_LATCH_ON = 4;
localparam integer STATE_LATCH_OFF = 5;
localparam integer STATE_HOLD = 6;
localparam integer ROW0_IS_TOP = 1;
localparam integer COL0_IS_LEFT = 0;
localparam integer SHIFT_MSB_FIRST = 0;
reg [2:0] state;
reg plane_sel;
reg [3:0] scan_row;
reg [5:0] bit_index;
reg [31:0] row_shift_word;
reg [31:0] col_shift_word_sin2;
reg [31:0] col_shift_word_sin3;
reg [13:0] hold_count;
reg [22:0] scroll_tick_count;
reg [8:0] scroll_offset;
function [31:0] row_word_for;
input [3:0] row_idx;
integer panel_row;
reg [15:0] one_hot_row;
begin
one_hot_row = 16'd0;
panel_row = ROW0_IS_TOP ? row_idx : (DISPLAY_ROWS - 1 - row_idx);
one_hot_row[panel_row] = 1'b1;
row_word_for = {one_hot_row, one_hot_row};
end
endfunction
function serial_pick32;
input [31:0] word;
input [5:0] idx;
begin
if (SHIFT_MSB_FIRST != 0) begin
serial_pick32 = word[idx];
end else begin
serial_pick32 = word[31 - idx];
end
end
endfunction
function [7:0] message_char;
input integer index;
begin
case (index)
0: message_char = "S";
1: message_char = "t";
2: message_char = "a";
3: message_char = "n";
4: message_char = "f";
5: message_char = "o";
6: message_char = "r";
7: message_char = "d";
8: message_char = " ";
9: message_char = "U";
10: message_char = "n";
11: message_char = "i";
12: message_char = "v";
13: message_char = "e";
14: message_char = "r";
15: message_char = "s";
16: message_char = "i";
17: message_char = "t";
18: message_char = "y";
19: message_char = " ";
20: message_char = "N";
21: message_char = "e";
22: message_char = "t";
23: message_char = "w";
24: message_char = "o";
25: message_char = "r";
26: message_char = "k";
27: message_char = ".";
default: message_char = " ";
endcase
end
endfunction
function [7:0] font_row_bits;
input [7:0] ch;
input [2:0] row;
begin
font_row_bits = 8'b00000000;
case (ch)
" ": begin
font_row_bits = 8'b00000000;
end
",": begin
case (row)
3'd5: font_row_bits = 8'b00011000;
3'd6: font_row_bits = 8'b00011000;
3'd7: font_row_bits = 8'b00110000;
default: font_row_bits = 8'b00000000;
endcase
end
".": begin
case (row)
// 3'd5: font_row_bits = 8'b00011000;
3'd6: font_row_bits = 8'b00011000;
default: font_row_bits = 8'b00000000;
endcase
end
"N": begin
case (row)
3'd0: font_row_bits = 8'b01000010;
3'd1: font_row_bits = 8'b01100010;
3'd2: font_row_bits = 8'b01010010;
3'd3: font_row_bits = 8'b01001010;
3'd4: font_row_bits = 8'b01000110;
3'd5: font_row_bits = 8'b01000010;
3'd6: font_row_bits = 8'b01000010;
default: font_row_bits = 8'b00000000;
endcase
end
＝＝＝省略＝＝＝
"w": begin
case (row)
3'd1: font_row_bits = 8'b01000100;
3'd2: font_row_bits = 8'b01000100;
3'd3: font_row_bits = 8'b01010100;
3'd4: font_row_bits = 8'b01010100;
3'd5: font_row_bits = 8'b01010100;
3'd6: font_row_bits = 8'b00101000;
default: font_row_bits = 8'b00000000;
endcase
end
"y": begin
case (row)
3'd1: font_row_bits = 8'b01000100;
3'd2: font_row_bits = 8'b01000100;
3'd3: font_row_bits = 8'b01000100;
3'd4: font_row_bits = 8'b00111100;
3'd5: font_row_bits = 8'b00000100;
3'd6: font_row_bits = 8'b00111000;
default: font_row_bits = 8'b00000000;
endcase
end
default: begin
font_row_bits = 8'b00000000;
end
endcase
end
endfunction
function [1:0] pixel_gray;
input integer screen_col;
input [3:0] row_idx;
input [8:0] scroll_pos;
integer text_x;
integer cell_index;
integer x_in_cell;
reg [7:0] ch;
reg [7:0] glyph_row;
begin
pixel_gray = 2'd0;
text_x = screen_col + scroll_pos - DISPLAY_COLS;
if ((text_x >= 0) && (text_x < TEXT_COLUMNS) && (row_idx < DISPLAY_ROWS)) begin
cell_index = text_x / CHAR_STRIDE;
x_in_cell = text_x % CHAR_STRIDE;
if ((cell_index < MSG_LEN) && (x_in_cell < FONT_W)) begin
ch = message_char(cell_index);
glyph_row = font_row_bits(ch, row_idx[3:1]);
if (glyph_row[7 - x_in_cell]) begin
pixel_gray = 2'd3;
end
end
end
end
endfunction
function [31:0] column_word_sin2_for;
input [3:0] row_idx;
input plane;
input [8:0] scroll_pos;
integer col;
integer panel_col;
integer lane_bit;
reg [1:0] gray;
begin
column_word_sin2_for = 32'd0;
for (col = 0; col < DISPLAY_COLS; col = col + 1) begin
panel_col = COL0_IS_LEFT ? col : (DISPLAY_COLS - 1 - col);
gray = pixel_gray(col, row_idx, scroll_pos);
if (gray[plane]) begin
if ((panel_col >= 16) && (panel_col < 32)) begin
lane_bit = panel_col - 16;
column_word_sin2_for[lane_bit] = 1'b1;
end else if (panel_col >= 48) begin
lane_bit = panel_col - 32;
column_word_sin2_for[lane_bit] = 1'b1;
end
end
end
end
endfunction
function [31:0] column_word_sin3_for;
input [3:0] row_idx;
input plane;
input [8:0] scroll_pos;
integer col;
integer panel_col;
integer lane_bit;
reg [1:0] gray;
begin
column_word_sin3_for = 32'd0;
for (col = 0; col < DISPLAY_COLS; col = col + 1) begin
panel_col = COL0_IS_LEFT ? col : (DISPLAY_COLS - 1 - col);
gray = pixel_gray(col, row_idx, scroll_pos);
if (gray[plane]) begin
if (panel_col < 16) begin
lane_bit = panel_col;
column_word_sin3_for[lane_bit] = 1'b1;
end else if ((panel_col >= 32) && (panel_col < 48)) begin
lane_bit = panel_col - 16;
column_word_sin3_for[lane_bit] = 1'b1;
end
end
end
end
endfunction
always @(posedge clk or negedge USER_KEY) begin
if (!USER_KEY) begin
state <= STATE_LOAD;
plane_sel <= 1'b0;
scan_row <= 4'd0;
bit_index <= 6'd31;
row_shift_word <= 32'd0;
col_shift_word_sin2 <= 32'd0;
col_shift_word_sin3 <= 32'd0;
hold_count <= 14'd0;
scroll_tick_count <= 23'd0;
scroll_offset <= 9'd0;
SIN1 <= 1'b0;
SIN2 <= 1'b0;
SIN3 <= 1'b0;
LATCH <= 1'b0;
LED_CLK <= 1'b0;
STROBE_ <= 1'b1;
end else begin
if (scroll_tick_count == SCROLL_TICK_CYC - 1) begin
scroll_tick_count <= 23'd0;
if (scroll_offset == SCROLL_SPAN - 1) begin
scroll_offset <= 9'd0;
end else begin
scroll_offset <= scroll_offset + 9'd1;
end
end else begin
scroll_tick_count <= scroll_tick_count + 23'd1;
end
case (state)
STATE_LOAD: begin
STROBE_ <= 1'b1;
LATCH <= 1'b0;
LED_CLK <= 1'b0;
SIN1 <= 1'b0;
SIN2 <= 1'b0;
SIN3 <= 1'b0;
row_shift_word <= row_word_for(scan_row);
col_shift_word_sin2 <= column_word_sin2_for(scan_row, plane_sel, scroll_offset);
col_shift_word_sin3 <= column_word_sin3_for(scan_row, plane_sel, scroll_offset);
bit_index <= 6'd31;
state <= STATE_SHIFT_SETUP;
end
STATE_SHIFT_SETUP: begin
LED_CLK <= 1'b0;
SIN1 <= serial_pick32(row_shift_word, bit_index);
SIN2 <= serial_pick32(col_shift_word_sin2, bit_index);
SIN3 <= serial_pick32(col_shift_word_sin3, bit_index);
state <= STATE_SHIFT_HIGH;
end
STATE_SHIFT_HIGH: begin
LED_CLK <= 1'b1;
state <= STATE_SHIFT_LOW;
end
STATE_SHIFT_LOW: begin
LED_CLK <= 1'b0;
if (bit_index == 0) begin
state <= STATE_LATCH_ON;
end else begin
bit_index <= bit_index - 6'd1;
state <= STATE_SHIFT_SETUP;
end
end
STATE_LATCH_ON: begin
LATCH <= 1'b1;
state <= STATE_LATCH_OFF;
end
STATE_LATCH_OFF: begin
LATCH <= 1'b0;
STROBE_ <= 1'b0;
hold_count <= plane_sel ? ((BASE_ON_TICKS << 1) - 1) : (BASE_ON_TICKS - 1);
state <= STATE_HOLD;
end
STATE_HOLD: begin
if (hold_count == 0) begin
STROBE_ <= 1'b1;
if (scan_row == DISPLAY_ROWS - 1) begin
scan_row <= 4'd0;
plane_sel <= ~plane_sel;
end else begin
scan_row <= scan_row + 4'd1;
end
state <= STATE_LOAD;
end else begin
hold_count <= hold_count - 14'd1;
end
end
default: begin
state <= STATE_LOAD;
end
endcase
end
end
endmoduleExpand
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