FPGA Cyclone IV DueProLogic - Push Button & LED

Introduction: FPGA Cyclone IV DueProLogic - Push Button & LED

About: All Projects are uploaded here - https://www.blogger.com/profile/13755472741602308501

In this tutorial, we are going to use the FPGA to control external LED circuit. We are going to implement the following tasks

(A) Use the push buttons on FPGA Cyclone IV DuePrologic to control LED.

(B) Flash LED on & off periodically

Video demo

Lab menu: https://roywchpi.blogspot.com/2020/06/10-fpga-dueprologic-push-button-led.html

Step 1: Build Electronic Circuit

Step 2: Check the Pin Planner and Edit Verilog Code

Step 3: Edit Verilog Code

When you buy FPGA DueProLogic, you should receive a DVD. After you open "Projects_HDL", you should see the original code file

Add the highlighted code. It registers the I/O ports and assign numbers to the ports.


output wire [7:0] XIO_1, //XIO -- D2-D9

output wire [5:0] XIO_2, //XIO -- D10-D12

output wire [5:0] XIO_3, //XIO -- D22-D29

input wire [5:0] XIO_4, //XIO -- D30-D37

input wire [5:0] XIO_5, //XIO -- D38-D45

output wire [4:0] XIO_6_OUT, //XIO -- D46-D53

input wire [31:5] XIO_6, //XIO -- D46-D53

output wire [2:0] XIO_7, //XIO -- D69,D70,D71,D74,D75,D76

input wire UBA, //Push Button Switches

input wire UBB //Push Button Switches

assign XIO_1[3] = start_stop_cntrl;

assign XIO_2[1] = start_blinky; //LED flash LED on and off

assign XIO_2[2] = 1'b1; //output HIGH

assign XIO_2[3] = ~UBA; //Push button A

assign XIO_2[4] = UBB; //Push button B

assign c_enable = XIO_5[2];

assign LEDExt = XIO_5[5];

Then we have to set a delay timer. Comment the original timer code and write a new timer function

//-----------------------------------------------

// LED Blinky start

//-----------------------------------------------

/*

always @(posedge CLK_66 or negedge RST)

begin

if(!RST)

start_blinky <= 1'b0;

else

begin

if(control_register[7:4] > 0)

start_blinky <= 1'b1;

else

start_blinky <= 1'b0;

end

end

*/

reg [31:0] ex;

initial begin

ex <= 32'b0;

start_blinky <= 1'b0;

end

always @(posedge CLK_66)

begin

ex <= ex + 1'b1;

if(ex > 100000000) //flash on/off ~1.6 seconds , clock 66MHz

begin

start_blinky <= !start_blinky;

ex <= 32'b0;

end

end

//-----------------------------------------------

// LED Delay Timer Counter

//-----------------------------------------------

/*

always @(posedge CLK_66 or negedge RST)

begin

if(!RST)

led_delay_counter <= TIMER_LOW_LIMIT;

else

begin

if(state[SELECT_MODE])

led_delay_counter <= timer_value;

else if(state[WAIT_FOR_TIMER])

led_delay_counter <= led_delay_counter - 1'd1;

end

end
*/

Step 4: Compile Verilog Code

Press "Start Compilation" in Quartus, no error message should be generated.

If you receive error message about multiple pins. Go to Assignments -> Device -> Device and Pin Options -> Dual-Purpose Pins -> change the value of the appropriate pin to "Use as regular I/O".

After compilation, you should get pof output file directly. If your software is not up-to-date, you may get sof file only. When it happens, click "File" in Quartus -> "convert programming files". Change the settings which are marked by red boxes.

Step 5: Let's Try It

After all, it should work!!! The yellow LED is always on. The red LED is flashing. The blue LED is turned off if you press button B. The green LED is turned on if you press button A

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