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- cpu21_pointer.v / cpu21_ps2_mouse.v / cpu21_vga.v 末尾多出一行 README 正文 (Tcl ...), 会导致 Vivado: ERROR: [Synth 8-2715] non-printable character 0xe4 - 新增 pipelined-cpu/tools/check_rtl_text.ps1: 综合前秒级自检, 检出代码位置上 的非 ASCII 文本/粘贴进来的正文行
242 lines
11 KiB
Verilog
242 lines
11 KiB
Verilog
`timescale 1ns / 1ps
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`default_nettype none
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// -----------------------------------------------------------------------------
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// cpu21_vga —— 640x480@60 的"格子"显示控制器（显存端口接板级顶层的双口 RAM）。
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//
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// CPU 不直接操作像素：它只通过 MMIO 往显示缓冲区里写"每格 1 字节"（字形 + 颜色），
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// 本模块按像素扫描把格子展开成画面（8x8 字模放大 2 倍填满 16x16 的格子）。
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// 这样一格只要 1 次字节写，刷屏开销极小。
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//
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// 网格：40 列 x 30 行，每格 16x16 像素 = 640x480。
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//
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// 时钟：本模块工作在 CPU 时钟（clk）下，用 tick（每 2 个 clk 一个使能）产生
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// 25 MHz 的像素节拍。**不引入第二个时钟域**，因此显示缓冲区的读（本模块）
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// 与写（MMIO，同一时钟）之间没有跨时钟域问题。
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//
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// 光标：由 CURSOR 寄存器的 (x,y) 决定，在对应格子上画一个白色闪动的方框
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// （CTRL[0] 控制显示与否）。缓冲区字节的 bit7 在本模块中不使用（保留）。
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// -----------------------------------------------------------------------------
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module cpu21_vga #(
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parameter integer H_VISIBLE = 640,
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parameter integer H_FP = 16,
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parameter integer H_SYNC = 96,
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parameter integer H_BP = 48,
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parameter integer V_VISIBLE = 480,
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parameter integer V_FP = 10,
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parameter integer V_SYNC = 2,
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parameter integer V_BP = 33,
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parameter integer COLS = 40,
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parameter integer ROWS = 30
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) (
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input wire clk,
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input wire reset,
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input wire tick, // 25 MHz 像素使能（每 2 个 clk 一拍）
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// 显示缓冲区读端口
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output wire [ 9:0] fb_raddr_o,
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input wire [31:0] fb_word_i,
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// 控制
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input wire [31:0] ctrl_i,
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input wire [31:0] cursor_i,
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// VGA 输出
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output reg [ 3:0] vga_r,
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output reg [ 3:0] vga_g,
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output reg [ 3:0] vga_b,
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output reg vga_hs,
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output reg vga_vs,
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output reg frame_tick_o
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);
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localparam integer H_TOTAL = H_VISIBLE + H_FP + H_SYNC + H_BP; // 800
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localparam integer V_TOTAL = V_VISIBLE + V_FP + V_SYNC + V_BP; // 525
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// ---------------------------------------------------------------------------
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// 扫描计数
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// ---------------------------------------------------------------------------
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reg [9:0] hx, vy;
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always @(posedge clk or posedge reset) begin
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if (reset) begin
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hx <= 10'd0;
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vy <= 10'd0;
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end
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else if (tick) begin
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if (hx == H_TOTAL - 1) begin
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hx <= 10'd0;
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vy <= (vy == V_TOTAL - 1) ? 10'd0 : (vy + 10'd1);
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end
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else begin
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hx <= hx + 10'd1;
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end
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end
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end
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wire de = (hx < H_VISIBLE) && (vy < V_VISIBLE);
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// 同步信号在 tick 上寄存输出
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wire hs_n = ~((hx >= (H_VISIBLE + H_FP)) && (hx < (H_VISIBLE + H_FP + H_SYNC)));
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wire vs_n = ~((vy >= (V_VISIBLE + V_FP)) && (vy < (V_VISIBLE + V_FP + V_SYNC)));
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// ---------------------------------------------------------------------------
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// 格子索引与缓冲区读出
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// ---------------------------------------------------------------------------
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wire [5:0] ccol = hx[9:4]; // 0..39
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wire [4:0] crow = vy[8:4]; // 0..29
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wire [10:0] cidx = (crow << 5) + (crow << 3) + ccol; // row*40 + col
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assign fb_raddr_o = cidx[10:2]; // 字地址（1 字 = 4 格）
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wire [1:0] lane = cidx[1:0];
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wire [31:0] cell_word = fb_word_i;
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wire [7:0] cell_byte = cell_word >> {lane, 3'b000};
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wire [3:0] glyph = cell_byte[3:0];
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wire [2:0] gcolor = cell_byte[6:4];
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// 全局背景色（字模点为 0 时显示的颜色）
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wire [2:0] bgcolor = ctrl_i[7:4];
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// ---------------------------------------------------------------------------
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// 8x8 字模（bit7 = 最左像素），放大 2 倍填满 16x16 的格子
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// ---------------------------------------------------------------------------
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wire [2:0] fx = hx[3:1];
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wire [2:0] fy = vy[3:1];
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function [7:0] font_row;
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input [3:0] g;
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input [2:0] r;
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begin
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case (g)
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4'd0:
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font_row = 8'h00; // 空白
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4'd1:
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font_row = (r == 3'd0) ? 8'h18 : (r == 3'd1) ? 8'h38 : (r == 3'd2) ? 8'h18 :
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(r == 3'd3) ? 8'h18 : (r == 3'd4) ? 8'h18 : (r == 3'd5) ? 8'h18 :
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(r == 3'd6) ? 8'h7E : 8'h00; // 1
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4'd2:
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font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h06 :
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(r == 3'd3) ? 8'h0C : (r == 3'd4) ? 8'h18 : (r == 3'd5) ? 8'h30 :
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(r == 3'd6) ? 8'h7E : 8'h00; // 2
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4'd3:
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font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h06 :
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(r == 3'd3) ? 8'h1C : (r == 3'd4) ? 8'h06 : (r == 3'd5) ? 8'h66 :
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(r == 3'd6) ? 8'h3C : 8'h00; // 3
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4'd4:
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font_row = (r == 3'd0) ? 8'h0C : (r == 3'd1) ? 8'h1C : (r == 3'd2) ? 8'h3C :
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(r == 3'd3) ? 8'h6C : (r == 3'd4) ? 8'h7E : (r == 3'd5) ? 8'h0C :
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(r == 3'd6) ? 8'h0C : 8'h00; // 4
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4'd5:
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font_row = (r == 3'd0) ? 8'h7E : (r == 3'd1) ? 8'h60 : (r == 3'd2) ? 8'h7C :
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(r == 3'd3) ? 8'h06 : (r == 3'd4) ? 8'h06 : (r == 3'd5) ? 8'h66 :
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(r == 3'd6) ? 8'h3C : 8'h00; // 5
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4'd6:
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font_row = (r == 3'd0) ? 8'h1C : (r == 3'd1) ? 8'h30 : (r == 3'd2) ? 8'h60 :
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(r == 3'd3) ? 8'h7C : (r == 3'd4) ? 8'h66 : (r == 3'd5) ? 8'h66 :
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(r == 3'd6) ? 8'h3C : 8'h00; // 6
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4'd7:
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font_row = (r == 3'd0) ? 8'h7E : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h0C :
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(r == 3'd3) ? 8'h18 : (r == 3'd4) ? 8'h18 : (r == 3'd5) ? 8'h18 :
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(r == 3'd6) ? 8'h18 : 8'h00; // 7
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4'd8:
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font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h66 :
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(r == 3'd3) ? 8'h3C : (r == 3'd4) ? 8'h66 : (r == 3'd5) ? 8'h66 :
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(r == 3'd6) ? 8'h3C : 8'h00; // 8
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4'd9:
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font_row = (r == 3'd0) ? 8'hFF : (r == 3'd1) ? 8'h81 : (r == 3'd2) ? 8'hBD :
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(r == 3'd3) ? 8'hA5 : (r == 3'd4) ? 8'hA5 : (r == 3'd5) ? 8'hBD :
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(r == 3'd6) ? 8'h81 : 8'hFF; // 未揭开的方块
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4'd10:
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font_row = (r == 3'd0) ? 8'h40 : (r == 3'd1) ? 8'h70 : (r == 3'd2) ? 8'h78 :
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(r == 3'd3) ? 8'h70 : (r == 3'd4) ? 8'h40 : (r == 3'd5) ? 8'h40 :
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(r == 3'd6) ? 8'h40 : 8'h00; // 旗
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4'd11:
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font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h7E : (r == 3'd2) ? 8'hFF :
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(r == 3'd3) ? 8'hFF : (r == 3'd4) ? 8'hFF : (r == 3'd5) ? 8'hFF :
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(r == 3'd6) ? 8'h7E : 8'h3C; // 雷
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4'd12:
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font_row = (r == 3'd0) ? 8'h81 : (r == 3'd1) ? 8'h42 : (r == 3'd2) ? 8'h24 :
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(r == 3'd3) ? 8'h18 : (r == 3'd4) ? 8'h18 : (r == 3'd5) ? 8'h24 :
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(r == 3'd6) ? 8'h42 : 8'h81; // 爆炸
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4'd13:
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font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h06 :
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(r == 3'd3) ? 8'h0C : (r == 3'd4) ? 8'h18 : (r == 3'd5) ? 8'h00 :
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(r == 3'd6) ? 8'h18 : 8'h00; // 问号
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4'd14:
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font_row = (r == 3'd3) ? 8'hFF : (r == 3'd4) ? 8'hFF : 8'h00; // 横线
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4'd15:
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font_row = 8'hFF; // 实心
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default:
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font_row = 8'h00;
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endcase
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end
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endfunction
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wire [7:0] frow = font_row(glyph, fy);
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wire glyph_px = frow[3'd7 - fx]; // 1 = 画字模点
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// ---------------------------------------------------------------------------
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// 光标框（闪动）
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// ---------------------------------------------------------------------------
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reg [24:0] blink_q;
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always @(posedge clk or posedge reset) begin
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if (reset)
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blink_q <= 25'd0;
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else if (tick)
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blink_q <= blink_q + 25'd1;
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end
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wire blink = blink_q[24];
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wire cursor_here = (cursor_i[4:0] == ccol) && (cursor_i[12:8] == crow);
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wire on_border = (hx[3:0] == 4'd0) || (hx[3:0] == 4'd15) ||
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(vy[3:0] == 4'd0) || (vy[3:0] == 4'd15);
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wire cursor_box = cursor_here && blink && ctrl_i[0] && on_border;
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// ---------------------------------------------------------------------------
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// 颜色（3 位调色板 -> 4:4:4 RGB）
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// ---------------------------------------------------------------------------
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function [11:0] pal;
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input [2:0] c;
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begin
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case (c)
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3'd0:
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pal = {4'h0, 4'h0, 4'h0}; // 黑
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3'd1:
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pal = {4'h0, 4'h0, 4'hA}; // 深蓝
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3'd2:
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pal = {4'h0, 4'hA, 4'h0}; // 绿
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3'd3:
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pal = {4'h0, 4'hA, 4'hA}; // 青
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3'd4:
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pal = {4'hA, 4'h0, 4'h0}; // 红
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3'd5:
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pal = {4'hA, 4'h0, 4'hA}; // 洋红
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3'd6:
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pal = {4'hA, 4'hA, 4'h0}; // 黄
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default:
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pal = {4'hA, 4'hA, 4'hA}; // 浅灰
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endcase
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end
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endfunction
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wire [2:0] px_color = glyph_px ? gcolor : bgcolor;
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wire [2:0] px_final = cursor_box ? 3'd7 : px_color;
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wire [11:0] px_rgb = de ? pal(px_final) : 12'h000;
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always @(posedge clk or posedge reset) begin
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if (reset) begin
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{vga_r, vga_g, vga_b} <= 12'h000;
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vga_hs <= 1'b1;
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vga_vs <= 1'b1;
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frame_tick_o <= 1'b0;
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end
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else if (tick) begin
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{vga_r, vga_g, vga_b} <= px_rgb;
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vga_hs <= hs_n;
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vga_vs <= vs_n;
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frame_tick_o <= (hx == H_TOTAL - 1) && (vy == V_TOTAL - 1);
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end
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end
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endmodule
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`default_nettype wire
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