COPILOT : PROGRAMMING PASCAL MEMORY RESIDENT CODE FOR USB

Creating a memory-resident code for USB in Pascal can be quite involved, but I can give you a general outline to get you started. Here's a basic example using Free Pascal and the libusb library:

1. Set Up Your Environment: Ensure you have Free Pascal and the libusb library installed.

2. Write the Code: Below is a simple example to enumerate USB devices and print their information:

pascal

{$mode objfpc}
uses
  libusb;

function hexptr(p: pointer): shortstring;
begin
  if p = nil then exit('NIL');
  Result := HexStr(p);
  while copy(Result, 1, 1) = '0' do delete(Result, 1, 1);
end;

var
  ctx: plibusb_context;
  list: plibusb_device;
  dev: plibusb_device;
  DSC: libusb_device_descriptor;
  e, count, i: longint;
begin
  writeln('This program must be started with sudo rights on Linux');
  e := libusb_init(ctx);
  writeln('e=', e, ' ctx=', hexptr(ctx));
  writeln('libusb version: ', libusb_get_version.major, '.', libusb_get_version.minor, '.', libusb_get_version.micro, '.', libusb_get_version.nano);
  count := libusb_get_device_list(ctx, list);
  writeln('count=', count, ' list=', hexptr(list));
  for i := 0 to count - 1 do
  begin
    writeln(i:2, ')');
    dev := @list[i];
    e := libusb_get_device_descriptor(dev, DSC);
    writeln('e=', e);
    if e = 0 then
    begin
      writeln('len=', DSC.bLength, ' VID=$', HexStr(DSC.idVendor, 4), ' PID=$', HexStr(DSC.idProduct, 4));
    end;
  end;
  libusb_free_device_list(list, 1);
  libusb_exit(ctx);
  writeln('END');
end.

3. Compile and Run: Compile the code using Free Pascal and run it with the necessary permissions.

This example enumerates all connected USB devices and prints their Vendor ID (VID) and Product ID (PID). You can expand this code to handle specific USB operations, such as reading or writing data to a USB device.

Does this help you get started with your project?