|
LE ;
end
else if(write_flag==1) begin
c_state<= n_state ;
end
else
c_state<=c_state ;
end
always @(*)begin
case (c_state)
IDLE: n_state = SET_FUNCTION ;
SET_FUNCTION: n_state = DISP_OFF ;
DISP_OFF: n_state = DISP_CLEAR ;
DISP_CLEAR: n_state = ENTRY_MODE ;
ENTRY_MODE: n_state = DISP_ON ;
DISP_ON : n_state = ROW1_ADDR ;
ROW1_ADDR: n_state = ROW1_0 ;
ROW1_0: n_state = ROW1_1 ;
ROW1_1: n_state = ROW1_2 ;
ROW1_2: n_state = ROW1_3 ;
ROW1_3: n_state = ROW1_4 ;
ROW1_4: n_state = ROW1_5 ;
ROW1_5: n_state = ROW1_6 ;
ROW1_6: n_state = ROW1_7 ;
ROW1_7: n_state = ROW1_8 ;
ROW1_8: n_state = ROW1_9 ;
ROW1_9: n_state = ROW1_A ;
ROW1_A: n_state = ROW1_B ;
ROW1_B: n_state = ROW1_C ;
ROW1_C: n_state = ROW1_D ;
ROW1_D: n_state = ROW1_E ;
ROW1_E: n_state = ROW1_F ;
ROW1_F: n_state = ROW2_ADDR ;
ROW2_ADDR: n_state = ROW2_0 ;
ROW2_0: n_state = ROW2_1 ;
ROW2_1: n_state = ROW2_2 ;
ROW2_2: n_state = ROW2_3 ;
ROW2_3: n_state = ROW2_4 ;
ROW2_4: n_state = ROW2_5 ;
ROW2_5: n_state = ROW2_6 ;
ROW2_6: n_state = ROW2_7 ;
ROW2_7: n_state = ROW2_8 ;
ROW2_8: n_state = ROW2_9 ;
ROW2_9: n_state = ROW2_A ;
ROW2_A: n_state = ROW2_B ;
ROW2_B: n_state = ROW2_C ;
ROW2_C: n_state = ROW2_D ;
ROW2_D: n_state = ROW2_E ;
ROW2_E: n_state = ROW2_F ;
ROW2_F: n_state = ROW1_ADDR ;
default: n_state = n_state ;
endcase
end
assign lcd_rw = 0;
always @(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
lcd_rs <= 0 ; //order or data 0: order 1:data
end
else if(write_flag == 1)begin
if((n_state==SET_FUNCTION)||(n_state==DISP_OFF)||
(n_state==DISP_CLEAR)||(n_state==ENTRY_MODE)||
(n_state==DISP_ON ) ||(n_state==ROW1_ADDR)||
(n_state==ROW2_ADDR))begin
lcd_rs<=0 ;
end
else begin
lcd_rs<= 1;
end
end
else begin
lcd_rs<=lcd_rs;
end
end
always @(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
lcd_data<=0 ;
end
else if(write_flag)begin
case(n_state)
IDLE: lcd_data <= 8'hxx;
SET_FUNCTION: lcd_data <= 8'h38; //2*16 5*8 8位数据
DISP_OFF: lcd_data <= 8'h08;
DISP_CLEAR: lcd_data <= 8'h01;
ENTRY_MODE: lcd_data <= 8'h06;
DISP_ON : lcd_data <= 8'h0c; //显示功能开，没有光标，且不闪烁，
ROW1_ADDR: lcd_data <= 8'h80; //00+80
ROW1_0: lcd_data <= row_1 [127:120];
ROW1_1: lcd_data <= row_1 [119:112];
ROW1_2: lcd_data <= row_1 [111:104];
ROW1_3: lcd_data <= row_1 [103: 96];
ROW1_4: lcd_data <= row_1 [ 95: 88];
ROW1_5: lcd_data <= row_1 [ 87: 80];
ROW1_6: lcd_data <= row_1 [ 79: 72];
ROW1_7: lcd_data <= row_1 [ 71: 64];
ROW1_8: lcd_data <= row_1 [ 63: 56];
ROW1_9: lcd_data <= row_1 [ 55: 48];
ROW1_A: lcd_data <= row_1 [ 47: 40];
ROW1_B: lcd_data <= row_1 [ 39: 32];
ROW1_C: lcd_data <= row_1 [ 31: 24];
ROW1_D: lcd_data <= row_1 [ 23: 16];
ROW1_E: lcd_data <= row_1 [ 15: 8];
ROW1_F: lcd_data <= row_1 [ 7: 0];
ROW2_ADDR: lcd_data <= 8'hc0; //40+80
ROW2_0: lcd_data <= row_2 [127:120];
ROW2_1: lcd_data <= row_2 [119:112];
ROW2_2: lcd_data <= row_2 [111:104];
ROW2_3: lcd_data <= row_2 [103: 96];
ROW2_4: lcd_data <= row_2 [ 95: 88];
ROW2_5: lcd_data <= row_2 [ 87: 80];
ROW2_6: lcd_data <= row_2 [ 79: 72];
ROW2_7: lcd_data <= row_2 [ 71: 64];
ROW2_8: lcd_data <= row_2 [ 63: 56];
ROW2_9: lcd_data <= row_2 [ 55: 48];
ROW2_A: lcd_data <= row_2 [ 47: 40];
ROW2_B: lcd_data <= |