tested mmap

import sys

import subprocess

MMAP_DATA = True

# globals

MEMPATH  = "/sys/devices/soc0/elphel393-mem@0"

VMEMPATH = "/sys/devices/soc0/elphel393-videomem@0"

# or just calculate based on image sizes

BUF_SIZE = 4096

PAGE_SIZE = 4096

# sbuf - buffer in system memory = cpu RAM

# vbuf - buffer in fpga memory = video memory

  subprocess.call(cmd,shell=True)

  print("Memory dumped into "+fname)

def mmap_pixel_array(port,size):

  with open(VMDEV_PRE+str(port),"r+b") as fp:

      data = mmap.mmap(fp.fileno(), size, offset = 0) # mmap all data

  return data

def get_byte(data,i):

  return struct.unpack_from(">B",data[i])[0]

def get_byte_str(data,i):

  res = get_byte(data,i)

  #return str(hex(res))

  return "{:02x}".format(res)

  #return format(get_byte(data,i),'#02x')

# MAIN

mmap_data = []

for i in range(2):

  set_sbuf_size(i)

  set_vbuf_position(i,0)

  copy_vbuf_to_sbuf(i,0)

  if MMAP_DATA:

    mmap_data.append(mmap_pixel_array(i,BUF_SIZE*PAGE_SIZE))

    # print the first 16 bytes only

    print(" ".join("{:02x}".format(get_byte(mmap_data[i],c)) for c in range(16)))

    # test: hexdump -C /dev/image_raw0

  else:

    save_pixel_array(i,"/tmp/port"+str(i)+".raw")

if not MMAP_DATA:

  print("Now scp raw files to pc and run bayer2rgb\n")