代码讲解 在这里：https://blog.csdn.net/aqwtyyh/article/details/78316334#comments
/*--------------------------------------------------------------*\
Filename : write_data.v
Author : Cwang
Description :
Revision History : 2017-10-116
Revision 1.0
Email : [email protected]
Company : Micro nano institute
\*---------------------------------------------------------------*/
module write_data(
input clk_1m,
input rst_n,
input write_data_start,
input spi_write_done,
input [7:0] rom_data,
input [31:0] num_k,
output spi_write_start,
output write_done,
output [9:0]spi_data,
output [9:0] rom_addr
);
reg [7:0] x;
reg [3:0] y;
reg [7:0] i;
reg [9:0] data;
reg start;
reg isdone;
//----------------------------------------------------=
reg [51:0] num/*synthesis syn_preserve=1*/;
always @(posedge clk_1m or negedge rst_n)
begin
if(!rst_n)
num <= 52'd0;
else
num <= ((num_k * 28'd100_000_000) >> 32) / 16;
end
//-----------------------------------------------------
reg [3:0] ge;
reg [3:0] shi;
reg [3:0] bai;
reg [3:0] qian;
reg [3:0] wan;
always @(posedge clk_1m or negedge rst_n)
begin
if(!rst_n)
begin
ge <= 4'd0;
shi <= 4'd0;
bai <= 4'd0;
qian<= 4'd0;
wan <= 4'd0;
end
else
begin
ge <= num % 10;
shi <= num / 10 % 10;
bai <= num / 100 % 10;
qian<= num / 1000 % 10;
wan <= num / 10000;
end
end
//-----------------------------------------------------
reg [3:0] j;
reg ge_flag, shi_flag, bai_flag, qian_flag, wan_flag;
reg F_flag, r_flag, e_flag, q_flag, maohao_flag;
reg H_flag, z_flag;
always @(posedge clk_1m or negedge rst_n)
begin
if(!rst_n)
begin
i <= 8'd0;
j <= 4'd0;
x <= 8'd0;
y <= 4'd0;
data <= {2'b11,8'h00};
start <= 1'b0;
isdone <= 1'b0;
F_flag <= 1'b0;
r_flag <= 1'b0;
e_flag <= 1'b0;
q_flag <= 1'b0;
maohao_flag <= 1'b0;
H_flag <= 1'b0;
z_flag <= 1'b0;
ge_flag <= 1'b0;
shi_flag <= 1'b0;
bai_flag <= 1'b0;
qian_flag <= 1'b0;
wan_flag <= 1'b0;
end
else
begin
if(write_data_start)
case(i)
//----------------------------------------------------
//清屏
8'd0,8'd4,8'd8,8'd12,8'd16,8'd20,8'd24,8'd28:
if(spi_write_done)
begin start <= 1'b0; i <= i + 1'b1; end
else
begin data <= {2'b00,4'hb,y}; start <= 1'b1; end
//列高位
8'd1,8'd5,8'd9,8'd13,8'd17,8'd21,8'd25,8'd29:
if(spi_write_done)
begin start <= 1'b0; i <= i + 1'b1; end
else
begin data <= {2'b00,4'h1,4'h0}; start <= 1'b1; end
//列低位
6'd2,8'd6,8'd10,8'd14,8'd18,8'd22,8'd26,8'd30:
if(spi_write_done)
begin start <= 1'b0; i <= i + 1'b1; end
else
begin data <= {2'b00,4'h0,4'h0}; start <= 1'b1; end
8'd3,8'd7,8'd11,8'd15,8'd19,8'd23,8'd27,8'd31:
if(x==8'd128)
begin y <= y + 1'b1; x <= 8'd0; i <= i + 1'b1; end
else
if(spi_write_done)
begin start <= 1'b0; x <= x + 1'b1; end
else
begin data <= {2'b01,8'd00}; start <= 1'b1; end
//---------------------------------------------------------------
8'd32:
begin y <= 4'h0; i <= i + 1'b1; end
//----------------------------------------------------------------------------
8'd33:
begin F_flag <= 1'b1; i <= i + 1'b1; end
8'd34: //'F'
case(j)
//设置页地址
6'd0,6'd4:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'hb,y}; start <= 1'b1; end
//高地址
6'd1,6'd5:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h1,4'h0}; start <= 1'b1; end
//低地址
6'd2,6'd6:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h0,4'h0}; start <= 1'b1; end
//填充8次
6'd3,6'd7:
if(x==8'd7)
begin y <= y + 1'b1; x <= 8'd0; j <= j + 1'b1; end
else
if(spi_write_done)
begin start <= 1'b0; x <= x + 1'b1; end
else
begin data <= {2'b01,rom_data}; start <= 1'b1; end
6'd8:
begin y <= 4'h0; j <= 6'd0; i <= i + 1'b1; end
endcase
8'd35:
begin F_flag <= 1'b0; r_flag <= 1'b1; i <= i + 1'b1; end
8'd36: //'r'
case(j)
//设置页地址
6'd0,6'd4:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'hb,y}; start <= 1'b1; end
//高地址
6'd1,6'd5:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h1,4'h0}; start <= 1'b1; end
//低地址
6'd2,6'd6:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h0,4'h8}; start <= 1'b1; end
//填充8次
6'd3,6'd7:
if(x==8'd7)
begin y <= y + 1'b1; x <= 8'd0; j <= j + 1'b1; end
else
if(spi_write_done)
begin start <= 1'b0; x <= x + 1'b1; end
else
begin data <= {2'b01,rom_data}; start <= 1'b1; end
6'd8:
begin y <= 4'h0; j <= 6'd0; i <= i + 1'b1; end
endcase
8'd37:
begin r_flag <= 1'b0; e_flag <= 1'b1; i <= i + 1'b1; end
8'd38: //'e'
case(j)
//设置页地址
6'd0,6'd4:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'hb,y}; start <= 1'b1; end
//高地址
6'd1,6'd5:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h1,4'h1}; start <= 1'b1; end
//低地址
6'd2,6'd6:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h0,4'h0}; start <= 1'b1; end
//填充8次
6'd3,6'd7:
if(x==8'd7)
begin y <= y + 1'b1; x <= 8'd0; j <= j + 1'b1; end
else
if(spi_write_done)
begin start <= 1'b0; x <= x + 1'b1; end
else
begin data <= {2'b01,rom_data}; start <= 1'b1; end
6'd8:
begin y <= 4'h0; j <= 6'd0; i <= i + 1'b1; end
endcase
8'd39:
begin e_flag <= 1'b0; q_flag <= 1'b1; i <= i + 1'b1; end
8'd40: //'q'
case(j)
//设置页地址
6'd0,6'd4:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'hb,y}; start <= 1'b1; end
//高地址
6'd1,6'd5:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h1,4'h1}; start <= 1'b1; end
//低地址
6'd2,6'd6:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h0,4'h8}; start <= 1'b1; end
//填充8次
6'd3,6'd7:
if(x==8'd7)
begin y <= y + 1'b1; x <= 8'd0; j <= j + 1'b1; end
else
if(spi_write_done)
begin start <= 1'b0; x <= x + 1'b1; end
else
begin data <= {2'b01,rom_data}; start <= 1'b1; end
6'd8:
begin y <= 4'h0; j <= 6'd0; i <= i + 1'b1; end
endcase
8'd41:
begin q_flag <= 1'b0; maohao_flag <= 1'b1; i <= i + 1'b1; end
8'd42: //':'
case(j)
//设置页地址
6'd0,6'd4:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'hb,y}; start <= 1'b1; end
//高地址
6'd1,6'd5:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h1,4'h2}; start <= 1'b1; end
//低地址
6'd2,6'd6:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h0,4'h0}; start <= 1'b1; end
//填充8次
6'd3,6'd7:
if(x==8'd7)
begin y <= y + 1'b1; x <= 8'd0; j <= j + 1'b1; end
else
if(spi_write_done)
begin start <= 1'b0; x <= x + 1'b1; end
else
begin data <= {2'b01,rom_data}; start <= 1'b1; end
6'd8:
begin y <= 4'h0; j <= 6'd0; i <= i + 1'b1; end
endcase
8'd43:
begin maohao_flag <= 1'b0; H_flag <= 1'b1; i <= i + 1'b1; end
8'd44: //'H'
case(j)
//设置页地址
6'd0,6'd4:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'hb,y}; start <= 1'b1; end
//高地址
6'd1,6'd5:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h1,4'h5}; start <= 1'b1; end
//低地址
6'd2,6'd6:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h0,4'h0}; start <= 1'b1; end
//填充8次
6'd3,6'd7:
if(x==8'd7)
begin y <= y + 1'b1; x <= 8'd0; j <= j + 1'b1; end
else
if(spi_write_done)
begin start <= 1'b0; x <= x + 1'b1; end
else
begin data <= {2'b01,rom_data}; start <= 1'b1; end
6'd8:
begin y <= 4'h0; j <= 6'd0; i <= i + 1'b1; end
endcase
8'd45:
begin H_flag <= 1'b0; z_flag <= 1'b1; i <= i + 1'b1; end
8'd46: //'z'
case(j)
//设置页地址
6'd0,6'd4:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'hb,y}; start <= 1'b1; end
//高地址
6'd1,6'd5:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h1,4'h5}; start <= 1'b1; end
//低地址
6'd2,6'd6:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h0,4'h8}; start <= 1'b1; end
//填充8次
6'd3,6'd7:
if(x==8'd7)
begin y <= y + 1'b1; x <= 8'd0; j <= j + 1'b1; end
else
if(spi_write_done)
begin start <= 1'b0; x <= x + 1'b1; end
else
begin data <= {2'b01,rom_data}; start <= 1'b1; end
6'd8:
begin y <= 4'h0; j <= 6'd0; i <= i + 1'b1; end
endcase
8'd47:
begin z_flag <= 1'b0; ge_flag <= 1'b1; i <= i + 1'b1; end
8'd48:
case(ge)
4'd0,4'd1,4'd2,4'd3,4'd4,4'd5,4'd6,4'd7,4'd8,4'd9:
case(j)
//设置页地址
6'd0,6'd4:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'hb,y}; start <= 1'b1; end
//高地址
6'd1,6'd5:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h1,4'h4}; start <= 1'b1; end
//低地址
6'd2,6'd6:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h0,4'h6}; start <= 1'b1; end
//填充8次
6'd3,6'd7:
if(x==8'd7)
begin y <= y + 1'b1; x <= 8'd0; j <= j + 1'b1; end
else
if(spi_write_done)
begin start <= 1'b0; x <= x + 1'b1; end
else
begin data <= {2'b01,rom_data}; start <= 1'b1; end
6'd8:
begin y <= 4'h0; j <= 6'd0; i <= i + 1'b1; end
endcase
default: ;
endcase
8'd49:
begin ge_flag <= 1'b0; shi_flag <= 1'b1; i <= i + 1'b1; end
//-------------------------------------------------------------------------------------
8'd50:
case(shi)
4'd0,4'd1,4'd2,4'd3,4'd4,4'd5,4'd6,4'd7,4'd8,4'd9:
case(j)
//设置页地址
6'd0,6'd4:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'hb,y}; start <= 1'b1; end
//高地址
6'd1,6'd5:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h1,4'h4}; start <= 1'b1; end
//低地址
6'd2,6'd6:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h0,4'h0}; start <= 1'b1; end
//填充8次
6'd3,6'd7:
if(x==8'd7)
begin y <= y + 1'b1; x <= 8'd0; j <= j + 1'b1; end
else
if(spi_write_done)
begin start <= 1'b0; x <= x + 1'b1; end
else
begin data <= {2'b01,rom_data}; start <= 1'b1; end
6'd8:
begin y <= 4'h0; j <= 6'd0; i <= i + 1'b1; end
endcase
default: ;
endcase
8'd51:
begin shi_flag <= 1'b0; bai_flag <= 1'b1; i <= i + 1'b1; end
8'd52:
case(bai)
4'd0,4'd1,4'd2,4'd3,4'd4,4'd5,4'd6,4'd7,4'd8,4'd9:
case(j)
//设置页地址
6'd0,6'd4:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'hb,y}; start <= 1'b1; end
//高地址
6'd1,6'd5:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h1,4'h3}; start <= 1'b1; end
//低地址
6'd2,6'd6:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h0,4'h8}; start <= 1'b1; end
//填充8次
6'd3,6'd7:
if(x==8'd7)
begin y <= y + 1'b1; x <= 8'd0; j <= j + 1'b1; end
else
if(spi_write_done)
begin start <= 1'b0; x <= x + 1'b1; end
else
begin data <= {2'b01,rom_data}; start <= 1'b1; end
6'd8:
begin y <= 4'h0; j <= 6'd0; i <= i + 1'b1; end
endcase
default: ;
endcase
8'd53:
begin bai_flag <= 1'b0; qian_flag <= 1'b1; i <= i + 1'b1; end
8'd54:
case(qian)
4'd0,4'd1,4'd2,4'd3,4'd4,4'd5,4'd6,4'd7,4'd8,4'd9:
case(j)
//设置页地址
6'd0,6'd4:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'hb,y}; start <= 1'b1; end
//高地址
6'd1,6'd5:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h1,4'h3}; start <= 1'b1; end
//低地址
6'd2,6'd6:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h0,4'h0}; start <= 1'b1; end
//填充8次
6'd3,6'd7:
if(x==8'd7)
begin y <= y + 1'b1; x <= 8'd0; j <= j + 1'b1; end
else
if(spi_write_done)
begin start <= 1'b0; x <= x + 1'b1; end
else
begin data <= {2'b01,rom_data}; start <= 1'b1; end
6'd8:
begin y <= 4'h0; j <= 6'd0; i <= i + 1'b1; end
endcase
default: ;
endcase
8'd55:
begin qian_flag <= 1'b0; wan_flag <= 1'b1; i <= i + 1'b1; end
8'd56:
case(wan)
4'd0,4'd1,4'd2,4'd3,4'd4,4'd5,4'd6,4'd7,4'd8,4'd9:
case(j)
//设置页地址
6'd0,6'd4:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'hb,y}; start <= 1'b1; end
//高地址
6'd1,6'd5:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h1,4'h2}; start <= 1'b1; end
//低地址
6'd2,6'd6:
if(spi_write_done)
begin start <= 1'b0; j <= j + 1'b1; end
else
begin data <= {2'b00,4'h0,4'h8}; start <= 1'b1; end
//填充8次
6'd3,6'd7:
if(x==8'd7)
begin y <= y + 1'b1; x <= 8'd0; j <= j + 1'b1; end
else
if(spi_write_done)
begin start <= 1'b0; x <= x + 1'b1; end
else
begin data <= {2'b01,rom_data}; start <= 1'b1; end
6'd8:
begin y <= 4'h0; j <= 6'd0; i <= i + 1'b1; end
endcase
default: ;
endcase
8'd57:
begin wan_flag <= 1'b0; i <= i + 1'b1; end
8'd58:
i <= 6'd47;
8'd59:
begin data <= {2'b01,8'd00}; y <= 4'd0; isdone <= 1'b1; i <= i + 1'b1; end
8'd60:
begin isdone <= 1'b0; i <= 6'd33; end
endcase
end
end
assign rom_addr = F_flag ? ((y) ? (x + 8'd168) : (x + 8'd160)) : //F
(r_flag ? (y ? (x + 8'd184) : (x + 8'd176)) :
(e_flag ? (y ? (x + 8'd200) : (x + 8'd192)) :
(q_flag ? (y ? (x + 8'd216) : (x + 8'd208)) :
(maohao_flag ? (y ? (x + 8'd232) : (x + 8'd224)) :
(H_flag ? (y ? (x + 8'd248) : (x + 8'd240)) :
(z_flag ? (y ? (x + 12'd264) : (x + 12'd256)) :
(ge_flag ? (y ? (x + (ge << 4) + 4'd8) : (x + (ge << 4))):
(shi_flag ? (y ? (x + (shi << 4) + 4'd8) : (x + (shi << 4))):
(bai_flag ? (y ? (x + (bai << 4) + 4'd8) : (x + (bai << 4))):
(qian_flag ? (y ? (x + (qian << 4) + 4'd8) : (x + (qian << 4))):
(y ? (x + (wan << 4) + 4'd8) : (x + (wan << 4)))))))))))));
assign write_done = isdone;
assign spi_data = data;
assign spi_write_start = start;
endmodule
