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lcd_demo code 説明

lcd_demo code 説明. module lcd_test(enable,rw,cs1,cs2,di,db,clk); output enable,rw,cs1,cs2,di; output [7:0]db; input clk; reg rw,cs1,cs2,di; reg [7:0]db; reg [2:0]state=0; reg [5:0]clry; //reg [6:0]shcount; reg [2:0]clrx; reg [7:0]img[0:7][0:255]; // 用來存放” F”,”P”,”G”,”A” 四個字的編碼

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lcd_demo code 説明

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  1. lcd_demo code説明

  2. module lcd_test(enable,rw,cs1,cs2,di,db,clk); output enable,rw,cs1,cs2,di; output [7:0]db; input clk; reg rw,cs1,cs2,di; reg [7:0]db; reg [2:0]state=0; reg [5:0]clry; //reg [6:0]shcount; reg [2:0]clrx; reg [7:0]img[0:7][0:255]; //用來存放”F”,”P”,”G”,”A”四個字的編碼 reg flag,cs; //Clks //原始clk經除頻後產生一新的enable clk,提供給lcd module使用 parameter PosScan=11; //0 for pre-sim, 12 for real run reg [PosScan+3:0] Clks; always @(posedge clk) Clks=Clks+1; assign enable=Clks[PosScan];

  3. //state parameter FcnSet=0; parameter Xaddr=1; parameter Yaddr=2; parameter WriteData=3; parameter Scan=4; always @(posedge enable) //must use posedge edge begin //先將”F”,”P”,”G”,”A”四個字的編碼放入2維陣列img中 img[0][0]=8‘b11111111;//F img[0][1]=8'b00010001; img[0][2]=8'b00010001; img[0][3]=8'b00010001; img[0][4]=8'b00010001; img[0][5]=8'b00010001; img[0][6]=8'b00000001; img[0][7]=8'b00000000;

  4. img[0][8]=8'b11111111;//P img[0][9]=8'b00010001; img[0][10]=8'b00010001; img[0][11]=8'b00010001; img[0][12]=8'b00010001; img[0][13]=8'b00010001; img[0][14]=8'b00001110; img[0][15]=8'b00000000; img[0][16]=8'b00111110;//G img[0][17]=8'b01000001; img[0][18]=8'b10000001; img[0][19]=8'b10110001; img[0][20]=8'b10010001; img[0][21]=8'b10010001; img[0][22]=8'b01010001; img[0][23]=8'b00110110; img[0][25]=8'b11111000;//A img[0][26]=8'b00010100; img[0][27]=8'b00010010; img[0][28]=8'b00010001; img[0][29]=8'b00010001; img[0][30]=8'b00010010; img[0][31]=8'b00010100; img[0][32]=8'b11111000;

  5. case(state) //寫一FSM去控制 lcd module FcnSet:begin //啟動lcd顯示器 cs<=0; di<=0; rw<=0; cs1<=1; cs2<=1; db<=8'b00_111111; state<=Xaddr; end Xaddr:begin //設定X軸位址 di<=0; db<={5'b10111,clrx};//x address state<=Yaddr; end Yaddr:begin //設定Y軸位址 db<={2'b01,clry}; //y address state<=WriteData; end

  6. WriteData:begin //將資料寫入所要顯示的位置 di<=1; db<=8'd0; state<=Xaddr; if(clrx==7 && clry==63 && flag==0) //寫完一邊 begin //LCD(64*8byte)後 state<=Scan; //換寫另一邊的LCD end if(flag) begin if(clrx==7 && clry==63) begin cs<=~cs; state<=Scan; end if(cs1) //cs1=1將資料寫到左邊LCD(64*8byte) db<=img[clrx][clry]; else //cs2=1將資料寫到右邊LCD(64*8byte) db<=img[clrx][clry+64]; di<=1; end

  7. clry<=clry+1; if(clry==63) //寫到第63行時換寫下一列 begin clrx<=clrx+1; end end Scan:begin //切換掃描左邊LCD or 右邊LCD case(cs) 0:begin cs1<=1; cs2<=0; end 1:begin cs1<=0; cs2<=1; end endcase di<=0; flag<=1; state<=Xaddr; end endcase end endmodule

  8. LCD module spec.

  9. LCD module spec.

  10. THE END

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