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//==========================================================================
//Filename :lcd12864_picture.v
//modulename:lcd12864_picture
//Author :a fei
//Date :2012-7-8
//Function :驅動12864,顯示圖像
//Uesedfor :
//==========================================================================
`timescale 1ns/1ps
module lcd12864_picture
(
//sys_signal
input i_50m_clk ,
input i_rst_n ,
output reg o_lcd_rs ,//12864端口
output reg o_lcd_rw ,
output reg o_lcd_en ,
output reg [7:0] o_lcd_data ,
output o_lcd_psb ,
output [1:0] o_led
// output o_lcd_rst
);
//assign o_lcd_rst = 1'b1 ;
assign o_lcd_psb = 1'b1 ;
//=============================================================================
//控制狀態機狀態
//=============================================================================
parameter Idle = 11'b00000000001 ;//上電初始狀態
parameter Set_mode = 11'b00000000010 ;//模式設置
parameter clear1 = 11'b00000000100 ;//數據地址清零
parameter Disp_on_off = 11'b00000001000 ;//顯示開和關
parameter Cursor = 11'b00000010000 ;//光標設置
parameter Stand_by = 11'b00000100000 ;//延時
parameter Clear2 = 11'b00001000000 ;//數據地址清零
parameter disp_function = 11'b00010000000 ;//開繪圖顯示
parameter Wr_address_Y = 11'b00100000000 ;//寫行地址
parameter Wr_address_X = 11'b01000000000 ;//寫列地址，列地址自動加1
parameter Wr_data = 11'b10000000000 ;//寫數據
reg [10:0] crt_state , next_state ;
//=================================================================
reg [15:0] cnt_1000 ;//E、RS信號脈沖寬度計數器 1000*20ns=20us
reg [15:0] time_cnt2;//寫數據地址數據間隔計數器
always@( posedge i_50m_clk or negedge i_rst_n )//
if( !i_rst_n )
cnt_1000 <= 16'b0 ;
else if(crt_state!=next_state)
cnt_1000 <= 16'b0 ;
else if(time_cnt2==16'hffff)
cnt_1000 <= 16'b0 ;
else if( cnt_1000 == 16'd4000)
cnt_1000 <= cnt_1000 ;
else
cnt_1000 <= cnt_1000 +1'b1 ;
reg [18:0] time_cnt1 ;//5ms計時器，初始化指令間隔
always@( posedge i_50m_clk or negedge i_rst_n )//
if( !i_rst_n )
time_cnt1 <= 18'b0 ;
else if(crt_state!=next_state)
time_cnt1 <= 18'b0 ;
else if( time_cnt1 == 18'h3ffff)
time_cnt1 <= time_cnt1 ;
else
time_cnt1 <= time_cnt1 +1'b1 ;
always@( posedge i_50m_clk or negedge i_rst_n )//寫數據或地址時間間隔，寫一個字節數據命令的耗時時間
if( !i_rst_n )
time_cnt2 <= 16'b0 ;
else if(crt_state!=next_state)
time_cnt2 <= 16'b0 ;
else if( time_cnt2 == 16'hffff)
time_cnt2 <= 16'h0 ;
else
time_cnt2 <= time_cnt2 +1'b1 ;
//==================================================================
reg[7:0] address_Y ;//行地址
reg[7:0] address_X ;//列地址
reg[3:0] cnt_16 ;//列地址計數器
reg[4:0] cnt_32 ;//行地址計數器
reg[9:0] rom_addr ;//圖片rom地址
wire[7:0] disp_data ;//圖片數據
//==================================================================
//上電等待時間
//==================================================================
reg [19:0] power_up_cnt ;//上電等待時間42ms
always@( posedge i_50m_clk or negedge i_rst_n )//
if( !i_rst_n )
power_up_cnt <= 20'b0 ;
else if(power_up_cnt==20'hff)//power_up_cnt==22'hff
power_up_cnt<= power_up_cnt ;
else
power_up_cnt <= power_up_cnt + 1'b1 ;
//====================================================================
//狀態轉移
//====================================================================
always@( posedge i_50m_clk or negedge i_rst_n )//
if( !i_rst_n )
crt_state <= Idle ;
else
crt_state <= next_state ;
always@( *)
case(crt_state)
Idle : if(power_up_cnt==20'hff) //時間42ms到
next_state = Set_mode ;
else
next_state = crt_state ;
Set_mode: if(time_cnt1 == 18'h3ffff) //模式設置
next_state = clear1 ;
else
next_state = crt_state ;
clear1 : if(time_cnt1 == 18'h3ffff)//清零
next_state = Disp_on_off ;
else
next_state = crt_state ;
Disp_on_off: if(time_cnt1 == 18'h3ffff)//顯示開、關
next_state = Cursor ;
else
next_state = crt_state ;
Cursor : if(time_cnt1 == 18'h3ffff)//光標設置
next_state = Stand_by ;
else
next_state = crt_state ;
Stand_by :if(time_cnt1 == 18'h3ffff)//延時5ms
next_state = Clear2 ;
else
next_state = crt_state ;
Clear2 : if(time_cnt2 == 16'hffff) //清零
next_state = disp_function ;
else
next_state = crt_state ;
disp_function : if(time_cnt2 == 16'hffff) //開繪圖功能
next_state = Wr_address_Y ;
else
next_state = crt_state ;
Wr_address_Y : if(time_cnt2 == 16'hffff)//寫行地址
next_state = Wr_address_X ;
else
next_state = crt_state ;
Wr_address_X : if(time_cnt2 == 16'hffff)//寫列地址
next_state = Wr_data ;
else
next_state = crt_state ;
Wr_data : if(rom_addr==10'd1023&&time_cnt2 == 16'hffff) //1024個字節數據讀完時，重新開始讀數據
next_state =Clear2 ;
else if(cnt_16==4'd15&&time_cnt2 == 16'hffff)//沒有讀完1024個字節數據，寫下一行數據
next_state = Wr_address_Y ;
else
next_state = crt_state ;
default :next_state = Idle ;
endcase
//===================================================================產生地址和數據
always@( posedge i_50m_clk or negedge i_rst_n )//
if(!i_rst_n )
cnt_16 <= 4'd0 ;
else if(crt_state==Clear2)
cnt_16 <= 4'd0 ;
else if(crt_state==Wr_data)//沒一行16個字節，寫完一個字節，計數器加1
if(time_cnt2==16'hffff)
cnt_16 <= cnt_16+1'b1 ;
else
cnt_16 <=cnt_16 ;
else
cnt_16 <=4'b0 ;
always@( posedge i_50m_clk or negedge i_rst_n )//
if(!i_rst_n )
cnt_32 <= 5'd0 ;
else if(crt_state==Clear2)
cnt_32 <= 5'd0 ;
else if(cnt_16==4'd15&&time_cnt2==16'hffff)//每寫完一行，行數加1
cnt_32 <= cnt_32+1'b1 ;
else
cnt_32 <= cnt_32 ;
always@( posedge i_50m_clk or negedge i_rst_n )//分上下屏，半屏的行地址范圍8‘h80+（0~31）
if(!i_rst_n )
address_Y <=8'b0 ;
else if(crt_state==Wr_address_Y) //行地址，垂直地址
address_Y <=8'h80+cnt_32 ;
else
address_Y <=address_Y ;
always@( posedge i_50m_clk or negedge i_rst_n )//分上下屏，只需給出首地址，列地址自動加1
if(!i_rst_n )
address_X <=8'b0 ;
else if(crt_state==Wr_address_X)
if(rom_addr<10'd512) //上半屏行起始地址
address_X <=8'h80 ;
else //下半屏行起始地址
address_X <=8'h88;
else
address_X <=address_X ;
///=============================================================圖像數據
always@( posedge i_50m_clk or negedge i_rst_n )//rom地址
if(!i_rst_n )
rom_addr <= 10'd0 ;
else if(crt_state==Clear2)
rom_addr <= 10'd0 ;
else if(crt_state==Wr_data)
if(time_cnt2==16'hffff)
rom_addr <= rom_addr +1'b1 ;
else
rom_addr <= rom_addr ;
else
rom_addr <= rom_addr ;
///rom 一共1024個字節數據
picture_rom u0_picture_rom(
.address( rom_addr ),
.clock ( i_50m_clk),
.q ( disp_data)
);
//==================================================================端口輸出
///////lcd_rs，1寫數據，0寫命令
always@( posedge i_50m_clk or negedge i_rst_n )//
if( !i_rst_n )
o_lcd_rs <= 1'b0 ;
else if((crt_state ==Wr_data)&&(cnt_1000<16'd4000))
o_lcd_rs <= 1'b1 ;
else
o_lcd_rs <= 1'b0 ;
//==lcd_rw ，總是寫
always@( posedge i_50m_clk)
o_lcd_rw <= 1'b0 ;
//====lcd_en
always@( posedge i_50m_clk or negedge i_rst_n )//
if( !i_rst_n )
o_lcd_en <= 1'b0 ;
else if(crt_state==Stand_by)
o_lcd_en <= 1'b0 ;
else if(cnt_1000>6'd5&&cnt_1000<16'd3900)//高電平
o_lcd_en <= 1'b1 ;
else
o_lcd_en <= 1'b0 ;
//lcd_data ,address
always@( *)
case(crt_state)
Idle : o_lcd_data = 8'h30 ;//模式設置
Set_mode : o_lcd_data = 8'h30 ;//模式設置
Disp_on_off : o_lcd_data = 8'h0c ;//顯示開、關
Cursor : o_lcd_data = 8'h06 ;//光標設置
clear1,Clear2 : o_lcd_data = 8'h01 ;//清零
disp_function : o_lcd_data = 8'h36 ;//繪圖功能
Wr_address_Y : o_lcd_data = address_Y ; //行地址
Wr_address_X : o_lcd_data = address_X ; //行地址
Wr_data : o_lcd_data = disp_data ;//數據
default : o_lcd_data = 8'hff ;
endcase
///=========================================================================
//LED閃爍，指示fpga工作狀態
//==========================================================================
led_block u0_led_block(
.i_clk_50M ( i_50m_clk ) ,
.i_fpga_clk ( i_50m_clk ) ,
.i_rst_n ( i_rst_n ) ,
.o_led ( o_led )
);
endmodule

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