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top_touch_display.v
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`include "lcd_module.dcp"
`include "cpu.v"
`include "io/InstMem.v"
`include "io/DataMem.v"
`define INPUT1_ADDR 32'b0000
`define INPUT2_ADDR 32'b0100
`define OUTPUT1_ADDR 32'b1000
`define OUTPUT2_ADDR 32'b1100
module FreqDiv #(parameter N = 100) (
input inclk,
output clk
);
function integer log2;
input integer value;
begin
for (log2 = 0; value > 0; log2 = log2 + 1) begin
value = value >> 1;
end
end
endfunction
reg clk_reg;
reg [log2(N):0] count;
initial begin
clk_reg = 0;
count = 0;
end
always @(posedge inclk) begin
count = count + 1;
if (count == N / 2) begin
clk_reg = ~clk_reg;
count = 0;
end
end
assign clk = clk_reg;
endmodule
module DFF (
input inclk,
input rstn,
input [31:0] d,
output [31:0] q
);
reg [31:0] q_reg;
initial begin
q_reg = 0;
end
always @(posedge inclk, negedge rstn) begin
if (!rstn) begin
q_reg = 0;
end
else begin
q_reg = d;
end
end
assign q = q_reg;
endmodule
module Debouncer #(
parameter N = 1000, // rate of clock to be debounced
parameter INITIAL = 0 // initial value of debounced signal
) (
input clk,
input rstn,
input noisy_signal,
output reg debounced_signal
);
function integer log2;
input integer value;
begin
for (log2 = 0; value > 0; log2 = log2 + 1) begin
value = value >> 1;
end
end
endfunction
reg [log2(N):0] counter;
always @(posedge clk or negedge rstn) begin
if (!rstn) begin
counter <= 0;
debounced_signal <= INITIAL;
end else begin
if (noisy_signal != debounced_signal) begin
counter <= counter + 1;
if (counter >= N) begin
counter <= 0;
debounced_signal <= noisy_signal;
end
end else begin
counter <= 0;
end
end
end
endmodule
module TOP_TouchDisplay (
input clk, // clock signal (100MHz, 1E-8s)
input resetn, // subfix 'n' means LOW affects
input input_sel, // input select, 0 for input1, 1 for input2
input cont_clk, // continuous clock for cpu
input btn_clkn, // button clk for cpu
input cpu_rstn, // cpu reset signal
output led_cout_rst, // led cout display for cpu reset
output led_cout_clk, // led cout display for cpu clock
// TOUCH SCREEN INTERFACE, DO NOT CHANGE
output lcd_rst,
output lcd_cs,
output lcd_rs,
output lcd_wr,
output lcd_rd,
inout [15:0] lcd_data_io,
output lcd_bl_ctr,
inout ct_int,
inout ct_sda,
output ct_scl,
output ct_rstn
);
// Touch screen
reg display_valid;
reg [39:0] display_name;
reg [31:0] display_value;
wire [5 :0] display_number;
wire input_valid;
wire [31:0] input_value; // input value received from touch screen
lcd_module lcd_module(
.clk (clk ),
.resetn (resetn ),
// CALL INTERFACE OF TOUCH SCREEN
.display_valid (display_valid ),
.display_name (display_name ),
.display_value (display_value ),
.display_number (display_number),
.input_valid (input_valid ),
.input_value (input_value ),
// INTERFACE OF LCD TOUCH SCREEN, DO NOT CHANGE
.lcd_rst (lcd_rst ),
.lcd_cs (lcd_cs ),
.lcd_rs (lcd_rs ),
.lcd_wr (lcd_wr ),
.lcd_rd (lcd_rd ),
.lcd_data_io (lcd_data_io ),
.lcd_bl_ctr (lcd_bl_ctr ),
.ct_int (ct_int ),
.ct_sda (ct_sda ),
.ct_scl (ct_scl ),
.ct_rstn (ct_rstn )
);
// CPU clock generation (100ns per clock cycle)
parameter FREQ_DIV = 100; // 1MHz, 1E-6s (1us)
wire clk_1000ns, clk_500ns;
FreqDiv #(FREQ_DIV) clk_gen_1000ns(
clk,
clk_1000ns
);
FreqDiv #(FREQ_DIV / 2) clk_gen_500ns(
clk,
clk_500ns
);
// Debounce step button
wire cpu_rstn_d;
Debouncer #(10000, 1) debouncer1( // 10ms
clk_1000ns,
resetn,
cpu_rstn,
cpu_rstn_d
);
wire btn_clkn_d;
Debouncer #(10000, 1) debouncer2( // 10ms
clk_1000ns,
resetn,
btn_clkn,
btn_clkn_d
);
// CPU control declaration
wire btn_clk_d = ~btn_clkn_d;
wire cpu_inclk = cont_clk ? clk_1000ns : btn_clk_d;
assign led_cout_rst = ~cpu_rstn_d;
assign led_cout_clk = ~cpu_inclk;
wire [31:0] PC;
wire [31:0] inst;
wire [31:0] DM_addr;
wire [31:0] DM_rdata;
wire [31:0] DM_wdata;
wire [31:0] ALU_out;
wire IM_R;
wire DM_CS;
wire DM_R;
wire DM_W;
wire [31:0] test_rf_addr; // ? TEST INTERFACE
wire [31:0] test_rf_data; // ? TEST INTERFACE
// DM control declaration
function integer log2;
input integer value;
begin
for (log2 = 0; value > 0; log2 = log2 + 1) begin
value = value >> 1;
end
end
endfunction
localparam N2 = FREQ_DIV + 50;
localparam N2bit = log2(N2);
reg [N2bit:0] enable_cnt1, enable_cnt2;
wire enable1 = |enable_cnt1;
wire enable2 = |enable_cnt2;
reg [31:0] input1, input2;
wire [31:0] output1, output2;
wire DM_CS_ctl = enable1 | enable2;
wire DM_W_ctl = enable1 | enable2;
wire [31:0] DM_addr_ctl = ( enable1 & ~enable2) ? `INPUT1_ADDR :
(~enable1 & enable2) ? `INPUT2_ADDR :
32'd0;
wire [31:0] DM_wdata_ctl = ( enable1 & ~enable2) ? input1 :
(~enable1 & enable2) ? input2 :
32'd0;
wire output1_update1 = DM_CS & DM_W & (DM_addr[31:0] == `OUTPUT1_ADDR);
wire output1_update2 = DM_CS_ctl & DM_W_ctl & (DM_addr_ctl[31:0] == `OUTPUT1_ADDR);
DFF dff1(
(output1_update1 | output1_update2) & clk_500ns,
1, // Data Memory will never be reset by reset button
output1_update2 ? DM_wdata_ctl : output1_update1 ? DM_wdata : output1,
output1
);
wire output2_update1 = DM_CS & DM_W & (DM_addr[31:0] == `OUTPUT2_ADDR);
wire output2_update2 = DM_CS_ctl & DM_W_ctl & (DM_addr_ctl[31:0] == `OUTPUT2_ADDR);
DFF dff2(
(output2_update1 | output2_update2) & clk_500ns,
1, // Data Memory will never be reset by reset button
output2_update2 ? DM_wdata_ctl : output2_update1 ? DM_wdata : output2,
output2
);
// CPU declaration
wire cpu_outclk;
localparam REGFILE_DISPLAY_START_NUMBER = 13;
parameter REGFILE_DISPLAY_RANGE = 32;
parameter REGFILE_START_ADDR = 32'b0000;
assign test_rf_addr = display_number - REGFILE_DISPLAY_START_NUMBER + REGFILE_START_ADDR; // ? TEST INTERFACE
CPU sccpu(
cpu_inclk,
cpu_rstn_d,
inst,
DM_rdata,
cpu_outclk,
IM_R,
DM_CS,
DM_R,
DM_W,
PC,
ALU_out,
DM_addr,
DM_wdata,
test_rf_addr, // ? TEST INTERFACE
test_rf_data // ? TEST INTERFACE
);
InstMem imem(
IM_R,
PC,
inst
);
DataMem dmem(
(DM_CS_ctl & DM_W_ctl) ? clk_500ns : cpu_outclk,
DM_CS | DM_CS_ctl,
DM_R,
DM_W | DM_W_ctl,
(DM_CS_ctl & DM_W_ctl) ? DM_addr_ctl : DM_addr,
(DM_CS_ctl & DM_W_ctl) ? DM_wdata_ctl : DM_wdata,
DM_rdata
);
// Touch input
always @(posedge clk) begin
// reset
if (!resetn) begin
input1 <= 32'd0;
input2 <= 32'd0;
enable_cnt1 <= 0;
enable_cnt2 <= 0;
end
else if (input_valid) begin
// Set display value
if (input_sel == 0) begin
input1 <= input_value;
enable_cnt1 <= N2;
end
else if (input_sel == 1) begin
input2 <= input_value;
enable_cnt2 <= N2;
end
end
if (|enable_cnt1) begin
enable_cnt1 = enable_cnt1 - 1;
end
if (|enable_cnt2) begin
enable_cnt2 = enable_cnt2 - 1;
end
end
// Output to touch screen
// Touch screen has 44 display areas, each area can display 32 bits
// 44 display areas are numbered from 1 to 44
always @(posedge clk)
begin
// Display register file data (0x0000 ~ 0x0020, 32 registers total)
// ? TEST INTERFACE REQUIRED
if (display_number >= REGFILE_DISPLAY_START_NUMBER && display_number < REGFILE_DISPLAY_START_NUMBER + REGFILE_DISPLAY_RANGE) begin
display_valid <= 1'b1;
display_name[39:16] <= "REG";
display_name[15: 8] <= {4'b0011, test_rf_addr[7:4]};
display_name[ 7: 0] <= {4'b0011, test_rf_addr[3:0]};
display_value <= test_rf_data;
end
// Display manual data
else begin
case(display_number)
6'd01 :
begin
display_valid <= 1'b1;
display_name <= "ADDR1";
display_value <= `INPUT1_ADDR;
end
6'd02 :
begin
display_valid <= 1'b1;
display_name <= " IN_1";
display_value <= input1;
end
6'd03 :
begin
display_valid <= 1'b1;
display_name <= "ADDR2";
display_value <= `INPUT2_ADDR;
end
6'd04 :
begin
display_valid <= 1'b1;
display_name <= " IN_2";
display_value <= input2;
end
6'd05 :
begin
display_valid <= 1'b1;
display_name <= "ADDR1";
display_value <= `OUTPUT1_ADDR;
end
6'd06 :
begin
display_valid <= 1'b1;
display_name <= "OUT_1";
display_value <= output1;
end
6'd07 :
begin
display_valid <= 1'b1;
display_name <= "ADDR2";
display_value <= `OUTPUT2_ADDR;
end
6'd08 :
begin
display_valid <= 1'b1;
display_name <= "OUT_2";
display_value <= output2;
end
6'd09 :
begin
display_valid <= 1'b1;
display_name <= " PC";
display_value <= PC;
end
6'd10 :
begin
display_valid <= 1'b1;
display_name <= " INST";
display_value <= inst;
end
default :
begin
display_valid <= 1'b0;
display_name <= 40'd0;
display_value <= 32'd0;
end
endcase
end
end
endmodule