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Altera_Forum's avatar
Altera_Forum
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21 years ago

Using MACRO

I'd like to program NIOS II like plc language "Structured Text " and

in my future i want to create system based on fpga and NIOS II that

allows me to write accessing memory and pheriperal like this

For example , i want to access to my image input and memory :

IF (I2.0==true) and (M5.5==true)

{

OUT10.5=true;

}

It's possible , writing macro and structure or onion , to obtain like i want ?

Obvios i must to include header file (.h)

Thanks for information

Walter

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    21 years ago

    /*

    * "Hello plc" example.

    * This example works on cyclone dev board

    */

    # include <stdio.h># include "system.h"# include "altera_avalon_pio_regs.h"

    # define BYTE alt_u8# define WORD alt_u16# define DWORD alt_u32

    # define BIT0 0x01# define BIT1 0x02# define BIT2 0x04# define BIT3 0x08# define BIT4 0x10# define BIT5 0x20# define BIT6 0x40# define BIT7 0x80

    # define BIT8 0x0100# define BIT9 0x0200# define BIT10 0x0400# define BIT11 0x0800# define BIT12 0x1000# define BIT13 0x2000# define BIT14 0x4000# define BIT15 0x8000

    # define PIO_WR(BASE,DATA) IOWR_ALTERA_AVALON_PIO_DATA((BASE),(DATA))# define PIO_RD(BASE) (IORD_ALTERA_AVALON_PIO_DATA((BASE)))

    typedef union {

    struct {

    BYTE b0:1; // bit0

    BYTE b1:1; // bit1

    BYTE b2:1; // bit2

    BYTE b3:1; // bit3

    BYTE b4:1; // bit4

    BYTE b5:1; // bit5

    BYTE b6:1; // bit6

    BYTE b7:1; // bit7

    } bit;

    BYTE val;

    } IO;

    IO in0,in1,out0;

    void read_inputs(void);

    void write_outputs(void);

    int main()

    {

    int i;

    printf("Hello from Nios II!\n");

    while(1) {

    read_inputs(); // read all inputs

    // do plc stuff

    out0.bit.b4=in0.bit.b0 ;

    out0.bit.b5=in0.bit.b1 ;

    out0.bit.b7=in0.bit.b0 & in0.bit.b1;

    write_outputs(); // write all outputs

    }

    return 0;

    }

    void read_inputs(void) {

    // negate that 1 means key pressed

    in0.val=~PIO_RD(BUTTON_PIO_BASE);

    }

    void write_outputs(void) {

    PIO_WR(LED_PIO_BASE,out0.val);

    }