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//==========================================================================
//Filename :lcd1602_ctl.v
//modulename:lcd1602_inf
//Author :a fei
//Function :驅動1602,包括初始化和數據的寫，寫入數據由用戶定義
//==========================================================================
`timescale 1ns/1ps
module lcd1602_ctl
(
//sys_signal
input i_50m_clk ,
input i_rst_n ,
input [7:0] i_disp_data ,//寫入的數據
input i_data_trig ,//數據觸發
input i_addr_trig1 ,//第一行地址觸發信號
input i_addr_trig2 ,//第二行地址觸發信號
input [7:0] i_addr , //地址
output reg o_lcd_rs ,//1602端口
output reg o_lcd_rw ,
output reg o_lcd_en ,
output reg [7:0] o_lcd_data
);
//=============================================================================
//控制狀態機狀態
//=============================================================================
parameter Idle = 10'b0000000001 ;//
parameter Set_mode = 10'b0000000010 ;//模式設置
parameter Disp_on_off = 10'b0000000100 ;//顯示開和關
parameter Cursor = 10'b0000001000 ;//光標設置
parameter Clear = 10'b0000010000 ;//數據地址清零
parameter Stand_by = 10'b0000100000 ;//準備就緒，初始化完成
parameter Wr_address1 = 10'b0001000000 ;//寫第一行首地址
parameter Wr_data1 = 10'b0010000000 ;//寫第一行數據
parameter Wr_address2 = 10'b0100000000 ;//寫第二行首地址
parameter Wr_data2 = 10'b1000000000 ;//寫第二行數據
reg [9:0] crt_state , next_state ;
//=================================================================
reg [15:0] cnt_4000 ;//TC，en脈沖寬度 4000*20ns=80us
reg data_trig ;
reg addr_tirg1 ;
reg addr_tirg2 ;
always@( posedge i_50m_clk or negedge i_rst_n )//
if( !i_rst_n )
cnt_4000 <= 16'b0 ;
else if(crt_state!=next_state)
cnt_4000 <= 16'b0 ;
else if(!data_trig &&i_data_trig)
cnt_4000 <= 16'b0 ;
else if( cnt_4000 == 16'd4000)
cnt_4000 <= cnt_4000 ;
else
cnt_4000 <= cnt_4000 +1'b1 ;
reg [18:0] time_cnt1 ;//5ms計時器，每個指令間隔
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 ;
//==================================================================
//檢測數據、地址觸發信號
reg[7:0] disp_data ;
reg[7:0] address ;
reg[3:0] data_cnt ;
reg[15:0] time_cnt2 ;
always@( posedge i_50m_clk or negedge i_rst_n )//
if( !i_rst_n )
data_trig <= 1'b0 ;
else
data_trig <= i_data_trig ;
always@( posedge i_50m_clk)
disp_data <= i_disp_data ;
always@( posedge i_50m_clk)
addr_tirg1 <= i_addr_trig1 ;
always@( posedge i_50m_clk)
addr_tirg2 <= i_addr_trig2 ;
always@( posedge i_50m_clk)
address <= i_addr ;
always@( posedge i_50m_clk) //數據持續最小時間控制
if(crt_state==Wr_data1||crt_state==Wr_data2)
if(! data_trig &&i_data_trig)
time_cnt2 <= 16'b0 ;
else if(time_cnt2==16'hffff)
time_cnt2 <= time_cnt2 ;
else
time_cnt2 <=time_cnt2+1'b1 ;
else
time_cnt2 <= 16'b0 ;
always@( posedge i_50m_clk) //數據個數計數器
if(crt_state==Wr_data1||crt_state==Wr_data2)
if(! data_trig &&i_data_trig)
data_cnt <= data_cnt +1'b1 ;
else
data_cnt <= data_cnt ;
else
data_cnt <=4'b0 ;
//==================================================================
//狀態轉移
//==================================================================
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'hfffff)//power_up_cnt==22'hff
power_up_cnt<= power_up_cnt ;
else
power_up_cnt <= power_up_cnt + 1'b1 ;
//====================================================================
//????
//====================================================================
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'hfffff) //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 = Clear ;
else
next_state = crt_state ;
Clear : 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(!addr_tirg1&&i_addr_trig1)//準備就緒
next_state = Wr_address1 ;
else if(!addr_tirg2&&i_addr_trig2)
next_state = Wr_address2 ;
else
next_state = crt_state ;
Wr_address1 : if( !data_trig &&i_data_trig)//寫第一行數據
next_state = Wr_data1 ;
else
next_state = crt_state ;
Wr_data1 : if(data_cnt==4'd6&&time_cnt2 == 16'hffff) //寫第一行數據，返回準備狀態
next_state = Stand_by ;
else
next_state = crt_state ;
Wr_address2 : if( !data_trig &&i_data_trig)//第二行數據
next_state = Wr_data2 ;
else
next_state = crt_state ;
Wr_data2 : if(data_cnt==4'd4&&time_cnt2==16'hffff) //第二行數據
next_state = Stand_by ;
else
next_state = crt_state ;
default :next_state = Idle ;
endcase
//==================================================================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_data2||crt_state ==Wr_data1)&&cnt_4000<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_4000>5'd10&&cnt_4000<16'd3990)
o_lcd_en <= 1'b1 ;
else
o_lcd_en <= 1'b0 ;
//lcd_data ,?????
always@( *)
case(crt_state)
Idle : o_lcd_data = 8'h38 ;
Set_mode : o_lcd_data = 8'h38 ;//模式設置
Disp_on_off : o_lcd_data = 8'h0e ;//顯示開、關
Cursor : o_lcd_data = 8'h06 ;//光標設置
Clear : o_lcd_data = 8'h01 ;//清零
Wr_address1,Wr_address2 : o_lcd_data = address [7:0] ; //地址
Wr_data1 ,Wr_data2 : o_lcd_data = disp_data[7:0] ;//數據
default : o_lcd_data = 8'hff ;
endcase
endmodule

復制代碼

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