Cours:Vhdl

Nios 2

interface pour le bus avalon

hardware

entity customPeriph is
    port (
        clk         : in  std_logic;
        reset_n     : in  std_logic;
        address     : in  std_logic_vector(1 downto 0);
        write       : in  std_logic;
        read        : in  std_logic;
        chipselect  : in  std_logic;
        writedata   : in  std_logic_vector(31 downto 0);
        readdata    : out std_logic_vector(31 downto 0)
    );
end entity customPeriph;

software

IOWR(CUSTOM_0_BASE,regNumber,value);

pio

Media:Nios_pio.pdf

irq avec le nios2

hardware

library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use ieee.std_logic_unsigned.all;


entity customIRQ is
    port (
        clk         : in  std_logic;
        reset_n     : in  std_logic;
        address     : in  std_logic_vector(1 downto 0);
        write       : in  std_logic;
        read        : in  std_logic;
        chipselect  : in  std_logic;
        writedata   : in  std_logic_vector(31 downto 0);
        irq         : out std_logic;
        readdata    : out std_logic_vector(31 downto 0)
    );
end entity customIRQ;

architecture rtl of customIRQ is

    signal s_irq     : std_logic;
	 
begin

    process(clk, reset_n)
    begin
        if rising_edge(clk) then
            -- prévoir un moyen pour acquitter l'irq
            -- par exemple avec une écriture sur un registre particulier
            if chipselect = '1' and write = '1' then
                s_irq <= '0';
	    elsif "condition pour déclencher une interruption" then
		s_irq <= '1';
            end if;
        end if;
    end process;
    irq <= s_irq;
end architecture rtl;

software

#include "sys/stdio.h"
#include <unistd.h>
#include "io.h"
#include "system.h"
#include "sys/alt_irq.h"
#include "drivers/inc/altera_avalon_pio_regs.h"

volatile int n=0;


static void myISR(void * context,alt_u32 id)
{
  // terminer par l'acquittement de l'interruption
  IOWR(BPS_0_BASE,0,0);
}

int main()
{ 
  // acquitter l'interruption si elle est déjà déclenchée
  IOWR(BPS_0_BASE,0,0);
  alt_ic_isr_register(BPS_0_IRQ_INTERRUPT_CONTROLLER_ID, BPS_0_IRQ ,(void *) myISR,NULL,NULL);

  while (1)
  {
  }
}

PIO

interruptions

static void myISR(void * context,alt_u32 id)
{
        // terminer par l'acquittement de l'interruption
	IOWR_ALTERA_AVALON_PIO_EDGE_CAP(PIO_0_BASE, 0);
	IORD_ALTERA_AVALON_PIO_EDGE_CAP(PIO_0_BASE);
}

int main()
{ 
  // choix des PIO déclenchant l'interruption
  IOWR_ALTERA_AVALON_PIO_IRQ_MASK(PIO_0_BASE, 0xff);
  // initialisation des fronts
  IOWR_ALTERA_AVALON_PIO_EDGE_CAP(PIO_0_BASE, 0);
  alt_ic_isr_register(PIO_0_IRQ_INTERRUPT_CONTROLLER_ID, PIO_0_IRQ ,(void *) myISR,NULL,NULL);
  while (1)
  {
  }
}

Evaluation

• Cours:evaluation_XR509_a25

de0 nano soc

• https://altera-fpga.github.io/rel-25.3/

• https://www.rocketboards.org/foswiki/Projects/TouchScreenLCDForAlteraSoC
• https://github.com/qtplatz/socfpga_debian
• https://www.rocketboards.org/foswiki/Documentation/GSRD131ProgrammingFPGA

• https://forum.rocketboards.org/t/cyclone-v-frame-buffer-ii-problem-with-device-tree-and-with-understanding-the-address-map/2831/2

• https://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&CategoryNo=167&No=941&PartNo=4#contents
• https://github.com/ikwzm/FPGA-SoC-U-Boot-DE0-Nano-SoC
• https://github.com/ikwzm/FPGA-SoC-Linux/blob/master/doc/install/format-disk-de0-nano-soc.md
• https://forum.digikey.com/t/debian-getting-started-with-the-de0-nano-soc-kit/12434

sudo apt-get update sudo apt-get install -y build-essential git bc bison flex \

 libssl-dev libncurses5-dev libncursesw5-dev \
 lzop u-boot-tools device-tree-compiler

Debian Jessie 8.0 rootfs The steps required to boot Debian are: This project creates a working install of Debian Jessie 8 on Altera SoC First create a working Yocto image Download the attached debian8 image file ( debian8.img.gz) Decompress the image using: $ gzip -d debian8.img.gz

Use DD to copy the image over the second partition of your sd card. If your card is /dev/mmcblk0 then this would be: $ dd if=debian8.img of=/dev/sdb2

Root password is "debian". Ethernet is preconfigured with dhcp. This can be changed through the normal debian method. Access by UART

linux

fstab

ajouter dans le fstab le montage de la partition root :

/dev/mmcblk0p2 / ext4 errors=remount-ro,relatime      0 1

pb de fsck ext4 : erreur FEATURE_C12

si version trop vieille de ext tools, insérer la carte sd sur une ditrib linux récente

tune2fs -O ^orphan_file /dev/mydevice
e2fsck -f /dev/mydevice