require "ad4"
require "ad4_defines"

io.write("USB-AD Test of Digital IO\n")

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

io.write("\nConnect Digital Outputs to Digital Inputs - press any key\n")
io.read()

io.write("Single Bit IO\n")
nib = {0, 1, 2, 4, 8}
for i = 1, 5 do
	ret = ad4.digital_out(x,2,nib[i])
	ret, data = ad4.digital_in(x,1,nib[i])
	io.write(string.format("Out = %2d   In = %2d\n", nib[i], data))
end

io.write("\nNibble IO\n")
for nib = 0, 15 do
	ret = ad4.digital_out(x,2,nib)
	ret, data = ad4.digital_in(x,1,nib)
	io.write(string.format("Out = %2d   In = %2d\n", nib, data))
end

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