require "ad4"

adh = ad4.open("usb-ad")
if adh == -1 then
  print("Error")
else
 print("USB-AD opened.")
end

sd  = {rate = 0.01, posthist = 500}

ch1 = {cha = 3}
ch2 = {cha = 4}
ch3 = {cha = 5}
ch4 = {cha = 6}

print("USB-AD start scan ... ")
ret, scan_result, data  = ad4.scan(adh, sd, ch1, ch2, ch3, ch4)
print("USB-AD scan done. ret="..ret.. " scan_result="..scan_result)

file = assert(io.open("bsp4.csv", "w"))
for i=1,table.maxn(data[1]) do
  local s = string.format("%i", i)
  for j=1,#data do
    s = s .. string.format("\t%8.3f", data[j][i])
  end

  file:write(s.."\n")
end
file:close()

ret = ad4.close(adh)
if ret == 0 then
  print("USB-AD closed.")
else
  print("Error")
end