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Altera_Forum
Honored Contributor I
717 Views

Programming the LCD on cyclone iii dev kit

Hello, 

 

Am a newbie with verilog and i have been trying to write a verilog code to display some characters on the lcd module on the cyclone 3 board...any help will be appreciated...my code is posted below..is this a good starting point or am totally off: 

 

module lcd_display (clk,lcd_rs, lcd_rw, lcd_e, lcd_code);  

input clk;  

//input user_dipswitch2; 

//input user_dipswitch3; 

//input [15:0]counter_out;  

reg [15:0] count=0;  

output reg lcd_rs ;  

output reg lcd_rw ;  

inout reg [3:0]lcd_code;  

output reg lcd_e; 

initial 

begin 

lcd_rs = 0; 

lcd_rw = 0; 

lcd_e = 0; 

end 

 

 

always @ (posedge clk)  

// if (user_dipswitch2) //initialize lcd 

begin 

count = count + 1;  

 

lcd_e = 1; 

case (count) 

 

16'h000f: lcd_code = 4'b0010; // function set  

16'h001f: lcd_code = 4'b0010;  

16'h0022: lcd_code = 4'b1100;  

16'h0797: lcd_code = 4'b0000; // display on  

16'h079f: lcd_code = 4'b1110;  

16'h1692: lcd_code = 4'b0000; //clear display  

16'h169a: lcd_code = 4'b0001;  

16'he845: lcd_code = 4'b0000; //entry mode set 

16'he84c: lcd_code = 4'b0110; 

16'hf200: lcd_code = 4'b0100; // set CGRAM address; 

16'hf20f: lcd_code = 4'b0110; 

16'hffaf: lcd_code = 4'b1000; //set DDRAM address 

16'hfffe: lcd_code = 4'b0110; 

16'hffff: begin  

lcd_rs = 1; 

lcd_code = 4'b1111; 

end 

endcase  

end 

 

// always @ (posedge clk) 

 

// if (user_dipswitch3) 

// begin 

// count = 0; 

// lcd_rs = 1; 

// lcd_code <= counter_out [15:12]; 

// lcd_code <= counter_out [11:8]; 

// lcd_code <= counter_out [7:4]; 

// lcd_code <= counter_out [3:0]; 

// end 

//  

 

 

endmodule
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3 Replies
Altera_Forum
Honored Contributor I
23 Views

 

--- Quote Start ---  

...any help  

--- Quote End ---  

 

have you seen example by Terasic?
Altera_Forum
Honored Contributor I
23 Views

thanks....

Altera_Forum
Honored Contributor I
23 Views

cool......

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