Difference between revisions of "Simple blinking LED"

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(The design)
(Quartus)
 
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[[Category: FPGA]]
 
[[Category: FPGA]]
 
This design introduce FPGA usage on APF. The design will allow you to synthesize a design and configure the FGPA to blink a LED.  
 
This design introduce FPGA usage on APF. The design will allow you to synthesize a design and configure the FGPA to blink a LED.  
 
{{Note|
 
For APF9328_devlight you will have to connect a LED as described on figure 1.
 
[[image:diode.png|center|frame|'''figure 1''' - ''LED wiring for APF9328 devlight'']]
 
On all others DevBoard, a led is already soldered on FPGA}}
 
 
  
 
== The design ==
 
== The design ==
Line 18: Line 12:
 
  use IEEE.numeric_std.all;
 
  use IEEE.numeric_std.all;
 
   
 
   
  entity Clk_div_led is
+
  entity led is
 
     Port (  
 
     Port (  
           Clk            : in  std_logic;
+
           refclk : in  std_logic;
           led_cathode    : out std_logic;
+
           led : out std_logic
          led_anode      : out std_logic
+
 
     );
 
     );
  end Clk_div_led;
+
  end led;
 
   
 
   
  architecture RTL of Clk_div_led is
+
  architecture RTL of led is
  constant max_count : natural := 48000000;
+
    constant max_count : natural := 48000000;
  signal Rst_n : std_logic;
+
    signal Rst : std_logic;
 
  begin
 
  begin
+
 
     Rst_n <= '1';
+
     Rst <= '0';
    led_cathode <= '0';
+
 
   
 
   
 
     -- 0 to max_count counter
 
     -- 0 to max_count counter
     compteur : process(Clk, Rst_n)
+
     compteur : process(refclk, Rst)
 
         variable count : natural range 0 to max_count;
 
         variable count : natural range 0 to max_count;
 
     begin
 
     begin
         if Rst_n = '0' then
+
         if Rst = '1' then
 
             count := 0;
 
             count := 0;
             led_anode <= '1';
+
             led <= '1';
         elsif rising_edge(Clk) then
+
         elsif rising_edge(refclk) then
 
             if count < max_count/2 then
 
             if count < max_count/2 then
                led_anode    <='1';
 
 
                 count := count + 1;
 
                 count := count + 1;
 +
                led <= '1';
 
             elsif count < max_count then
 
             elsif count < max_count then
                 led_anode    <='0';
+
                 led <= '0';
 
                 count := count + 1;
 
                 count := count + 1;
 
             else
 
             else
 +
                led <= '1';
 
                 count := 0;
 
                 count := 0;
                led_anode    <='1';
 
 
             end if;
 
             end if;
 
         end if;
 
         end if;
Line 56: Line 48:
 
  end RTL;
 
  end RTL;
 
</source>
 
</source>
 +
 
=== Pinout ===
 
=== Pinout ===
 
To synthesize this code, use [[ISE_WebPack_installation_on_Linux | Xilinx Web Pack]], create a new project and add this VHDL module.
 
To synthesize this code, use [[ISE_WebPack_installation_on_Linux | Xilinx Web Pack]], create a new project and add this VHDL module.
Line 61: Line 54:
 
{{Note| Don't forget to power the FPGA IO bank as explained in [[datasheet]]}}
 
{{Note| Don't forget to power the FPGA IO bank as explained in [[datasheet]]}}
  
ISE need to know where to branch LED pins on its IO, this pinout is describe in constraint file with extension '''.ucf'''.
+
ISE/Quartus need to know where to branch LED pins on its IO, this pinout is describe in constraint file with extension '''.ucf'''.
  
 
* For '''APF9328''':
 
* For '''APF9328''':
Line 70: Line 63:
 
TIMESPEC "TS_Clk" = PERIOD "Clk" 10.42 ns HIGH 50 %;
 
TIMESPEC "TS_Clk" = PERIOD "Clk" 10.42 ns HIGH 50 %;
 
# LED
 
# LED
NET "led_cathode" LOC = "P118"| IOSTANDARD = LVCMOS33 ;
+
NET "led" LOC = "P118"| IOSTANDARD = LVCMOS33 ;
NET "led_anode"  LOC = "P116"| IOSTANDARD = LVCMOS33 ;
+
 
</source>
 
</source>
  
Line 81: Line 73:
 
TIMESPEC "TS_Clk" = PERIOD "Clk" 10 ns HIGH 50 %;
 
TIMESPEC "TS_Clk" = PERIOD "Clk" 10 ns HIGH 50 %;
 
# LED
 
# LED
NET "led_cathode" LOC = "C15"| IOSTANDARD = LVCMOS33 ; #IO_L24N_1
+
NET "led" LOC = "C15"| IOSTANDARD = LVCMOS33 ; #IO_L24N_1
NET "led_anode"  LOC = "C16"| IOSTANDARD = LVCMOS33 ; #IO_L24P_1
+
 
</source>
 
</source>
  
Line 92: Line 83:
 
TIMESPEC "TS_Clk" = PERIOD "Clk" 10.77 ns HIGH 50 %;
 
TIMESPEC "TS_Clk" = PERIOD "Clk" 10.77 ns HIGH 50 %;
 
# LED
 
# LED
NET "led_cathode" LOC = "G15"| IOSTANDARD = LVCMOS33 ; #IO_L41N_GCLK8_M1CASN_1
+
NET "led" LOC = "G15"| IOSTANDARD = LVCMOS33 ; #IO_L41N_GCLK8_M1CASN_1
NET "led_anode"  LOC = "G14"| IOSTANDARD = LVCMOS33 ; #IO_L41P_GCLK9_IRDY_M1RASN_1
+
 
</source>
 
</source>
  
Line 111: Line 101:
 
== Generate bitstream ==
 
== Generate bitstream ==
  
 +
=== ISE ===
 
Once these two files are written, FPGA configuration file, also named "bitstream", can be generated by clicking on ''Synthetize - XST'' then ''Implement Design'' and finally ''Generate Programming File''. If all these operations are correctly done, a file with ".bit" extension will be generated.
 
Once these two files are written, FPGA configuration file, also named "bitstream", can be generated by clicking on ''Synthetize - XST'' then ''Implement Design'' and finally ''Generate Programming File''. If all these operations are correctly done, a file with ".bit" extension will be generated.
 +
 +
=== Quartus ===
 +
 +
See the [[Quartus]] page for tutorials.
  
 
== Configure FPGA ==
 
== Configure FPGA ==

Latest revision as of 14:24, 25 November 2021

This design introduce FPGA usage on APF. The design will allow you to synthesize a design and configure the FGPA to blink a LED.

The design

VHDL code

The VHDL code above describe a clock divider by 48000000 to generate a 0.5 Hz clock that will blink the LED.

 library IEEE;
 use IEEE.STD_LOGIC_1164.ALL;
 use IEEE.numeric_std.all;
 
 entity led is
    Port ( 
           refclk : in  std_logic;
           led : out std_logic
    );
 end led;
 
 architecture RTL of led is
    constant max_count : natural := 48000000;
    signal Rst : std_logic;
 begin

    Rst <= '0';
 
    -- 0 to max_count counter
    compteur : process(refclk, Rst)
        variable count : natural range 0 to max_count;
    begin
        if Rst = '1' then
            count := 0;
            led <= '1';
        elsif rising_edge(refclk) then
            if count < max_count/2 then
                count := count + 1;
                led <= '1';
            elsif count < max_count then
                led <= '0';
                count := count + 1;
            else
                led <= '1';
                count := 0;
            end if;
        end if;
    end process compteur; 
 end RTL;

Pinout

To synthesize this code, use Xilinx Web Pack, create a new project and add this VHDL module.

Note Note: Don't forget to power the FPGA IO bank as explained in datasheet


ISE/Quartus need to know where to branch LED pins on its IO, this pinout is describe in constraint file with extension .ucf.

  • For APF9328:
# Clock at 96MHz
NET "Clk" LOC = "P55";
NET "Clk" TNM_NET = "Clk";
TIMESPEC "TS_Clk" = PERIOD "Clk" 10.42 ns HIGH 50 %;
# LED
NET "led" LOC = "P118"| IOSTANDARD = LVCMOS33 ;
  • For APF27
# Clock at 100MHz
NET "Clk" LOC = "N9"; # CLK0
NET "Clk" TNM_NET = "Clk";
TIMESPEC "TS_Clk" = PERIOD "Clk" 10 ns HIGH 50 %;
# LED
NET "led" LOC = "C15"| IOSTANDARD = LVCMOS33 ; #IO_L24N_1
  • For APF51
# Clock at 92.85MHz
NET "Clk" LOC = "N8"; # EIM_BCLK
NET "Clk" TNM_NET = "Clk";
TIMESPEC "TS_Clk" = PERIOD "Clk" 10.77 ns HIGH 50 %;
# LED
NET "led" LOC = "G15"| IOSTANDARD = LVCMOS33 ; #IO_L41N_GCLK8_M1CASN_1
  • For APF6_SP
# Clock is the differential PCIe clock (LVDS) at 100MHz
set_instance_assignment -name IO_STANDARD "1.5-V PCML" -to Clk
set_location_assignment PIN_V4 -to Clk
set_location_assignment PIN_U4 -to "Clk(n)"
# LED
# For the first apf6dev serie this pin must be used :
set_location_assignment PIN_M10 -to led 
# Others apf6dev will use PIN_K15

These constraints files examples can be found in Armadeus BSP's firmware/leds/blinking_led/src/ directory.

Generate bitstream

ISE

Once these two files are written, FPGA configuration file, also named "bitstream", can be generated by clicking on Synthetize - XST then Implement Design and finally Generate Programming File. If all these operations are correctly done, a file with ".bit" extension will be generated.

Quartus

See the Quartus page for tutorials.

Configure FPGA

To configure FGPA the bitstream must be downloaded from Host to APF's memory and then from APF's memory to FPGA.

Host to APF

Downloading Bitstream from Host to APF can be done in different way : with tftp from U-Boot, with tftp from Linux, with serial from U-Boot or with nfs from Linux. Here the file is downloaded with tftp in U-Boot:

  • First copy bitstream in the host tftp directory:
 cp blinking_led_apfXX_200k.bit /tftpboot
  • Then download it in APF ram with U-Boot command :
 BIOS> tftpboot ${loadaddr} blinking_led_apfXX_200k.bit
 dm9000 i/o: 0x15c00000, id: 0x90000a46 
 MAC: 00:0e:32:00:00:01
 operating at 10M half duplex mode
 TFTP from server 192.168.0.143; our IP address is 192.168.0.10
 Filename 'Clk_div_led.bit'.
 Load address: 0x8000000
 Loading: T ##########################
 done
 Bytes transferred = 131029 (1ffd5 hex)

APF to FPGA

Finally, to download bitstream in FPGA (to configure the FGPA) use the U-Boot fpga command:

 BIOS>fpga load 0 ${loadaddr} ${firmware_len}

FPGA configuration can also be done in Linux.

Enjoy the beauty of a blinking LED

To see the LED blinking, the FPGA bank must be powered as explain in the datasheet.