Fream Reader DE1-SoC

Dear all,

I want to manually start VGA output using Frame Reader and Clocked Video Output.

As a reference I'm using project form SystemCD: DE1-SoC_v.3.1.1_SystemCD\Demonstrations\SOC_FPGA\DE1_SOC_Linux_FB. (so there is no need to attach

The original design is working correctly with DE1_SoC_FB (displaying console)

Then I change SD card image to DE1_SoC_SD (simple OS without any video) and try to configure FrameReader manually:

# include <stdio.h># include <unistd.h># include <fcntl.h> # include <sys/mman.h> # include "hwlib.h" # include "socal/socal.h"# include "socal/hps.h" # include "socal/alt_gpio.h"# include "hps_0.h"# include "frame_reader.h"
# define REG_BASE 0xFF200000# define REG_SPAN 0x00200000
void* virtual_base;
void* video_addr;
void* led_addr;
void* sw_addr;
int fd;
int switches;
int i,j;
uint8_t video_ram;
int main(){
    fd = open("/dev/mem", (O_RDWR|O_SYNC));
    virtual_base = mmap(NULL, REG_SPAN, (PROT_READ|PROT_WRITE), MAP_SHARED, fd, REG_BASE);
    led_addr = virtual_base + LED_PIO_BASE;
    sw_addr=virtual_base + DIPSW_PIO_BASE;
    
    
    video_addr = virtual_base + ALT_VIP_VFR_VGA_BASE;
    
    *((uint32_t *)(video_addr)+ALTERA_FRAME_READER_FRAME_0_BASE_ADDR) = (uint32_t)video_ram;
    usleep(100);
    *((uint32_t *)(video_addr)+ALTERA_FRAME_READER_FRAME_0_WORDS) =  1024*768*4*8/128;//p. 13-1/2 -  pixels*planes*bits_per_pixel_per_plane/master bus width
    *((uint32_t  *)(video_addr)+ALTERA_FRAME_READER_FRAME_0_SINGLE_CYCLE_CPATERNS) =  1024*768;//p. 13-1 - color planes = number of pixels
    *((uint32_t *)(video_addr)+ALTERA_FRAME_READER_FRAME_0_WIDTH) = 1024;
    *((uint32_t *)(video_addr)+ALTERA_FRAME_READER_FRAME_0_HEIGHT) = 768;
    *((uint32_t *)(video_addr)+ALTERA_FRAME_READER_FRAME_0_INTERLACED) = 3;
    
    *((uint32_t *)(video_addr)+ALTERA_FRAME_READER_FRAME_SELECT) = ALTERA_FRAME_READER_FRAME_SELECT_0;
    *((uint32_t *)(video_addr)+ALTERA_FRAME_READER_CONTROL) = ALTERA_FRAME_READER_CONTROL_GO;
    
    for(i=0;i<1024;i++){
        for(j=0;j<768;j++){
            video_ram=i+j;
        }
    }
    
    /*while(1){
        *((uint32_t *)(video_addr)+ALTERA_FRAME_READER_CONTROL) = ALTERA_FRAME_READER_CONTROL_GO;
        *((uint32_t *)(video_addr)+ALTERA_FRAME_READER_CONTROL) = 0;
    }*/
    
    while(1){
        switches=*(uint32_t *)sw_addr;
        *(uint32_t *)led_addr=switches;
        usleep(1000000);
        printf("%u %zu %zu\n",
        switches,
        *((uint32_t *)(video_addr)+ALTERA_FRAME_READER_FRAME_0_BASE_ADDR),
        (uint32_t)video_ram);
    }
    return 0;
}

# ifndef _ALTERA_FRAME_READER_H# define _ALTERA_FRAME_READER_H
//#define ALTERA_FRAME_READER_ 0x# define ALTERA_FRAME_READER_CONTROL 0x0
   # define ALTERA_FRAME_READER_CONTROL_GO 0x1
   # define ALTERA_FRAME_READER_CONTROL_INT_EN 0x2
# define ALTERA_FRAME_READER_STATUS 0x4
   # define ALTERA_FRAME_READER_STATUS_STATUS 0x1
    # define ALTERA_FRAME_READER_INTERRUPT 0x8
   # define ALTERA_FRAME_READER_INTERRUPT_RESET 0x1
# define ALTERA_FRAME_READER_FRAME_SELECT 0xC
   # define ALTERA_FRAME_READER_FRAME_SELECT_0 0x0
   # define ALTERA_FRAME_READER_FRAME_SELECT_1 0x1
    # define ALTERA_FRAME_READER_FRAME_0_BASE_ADDR 0x10# define ALTERA_FRAME_READER_FRAME_0_WORDS 0x14# define ALTERA_FRAME_READER_FRAME_0_SINGLE_CYCLE_CPATERNS 0x18# define ALTERA_FRAME_READER_FRAME_0_RESERVED 0x1C# define ALTERA_FRAME_READER_FRAME_0_WIDTH 0x20# define ALTERA_FRAME_READER_FRAME_0_HEIGHT 0x24# define ALTERA_FRAME_READER_FRAME_0_INTERLACED 0x28
# define ALTERA_FRAME_READER_FRAME_1_BASE_ADDR 0x2C# define ALTERA_FRAME_READER_FRAME_1_WORDS 0x30# define ALTERA_FRAME_READER_FRAME_1_SINGLE_CYCLE_CPATERNS 0x34# define ALTERA_FRAME_READER_FRAME_1_RESERVED 0x38# define ALTERA_FRAME_READER_FRAME_1_WIDTH 0x3C# define ALTERA_FRAME_READER_FRAME_1_HEIGHT 0x40# define ALTERA_FRAME_READER_FRAME_1_INTERLACED 0x44
# endif /* _ALTERA_FRAME_READER_H */

But VGA screen shows "No Signal". I modified the code in different ways, according to several therads on this forum, but nothing helped - changing interlacing, words, single cycle patterns etc.

Also nowhere i found complete QSys design with working code - sometimes there is a design but without working simple code, sometimes code reported to work, but without details of the design.

Thank you in advise for any help.