FreeDOS ad-hoc module for micropython

Fun time of python on embedded FreeDOS boards is come!

This is only «some» files of build (see building part at micropython wiki).

Binary releases available at https://github.com/pohmelie/micropython-freedos/releases

Building

1. Follow the freedos build guide.
2. Before building micropython copy this repo files to micropython/unix directory overwriting.

dos module

Micropython extended with dos module, which have some classic DOS functions:

• inportb, inportw, outportb, outportw for port io.
• mem_get_byte, mem_set_byte for slow far pointers.
• fmemcpy(address, bytes) for fast far memory copy.
• enable, disable interrupts.
• bios_timeofday, gettime, settime, getdate, setdate for some datetime manipulation.

Next extending

Dos module (or another) one can be simply extended. Here is some pattern, cause right now there is no developer api explanation on micropython wiki/docs.

1. #include "py/runtime.h", which contains all(?) macros you need for developing.

2. Define your function in format like

   static mp_obj_t mod_modulename_funcname(mp_obj_t arg1, mp_obj_t arg2, mp_obj_t arg3)

   If your function have more than 3 arguments, then use

   static mp_obj_t mod_modulename_funcname(size_t n, const mp_obj_t *args)

3. «Fill» function body.

   To unpack arguments you should use mp_obj_get_ macros(?) family or similar, I have no experience with data structures as arguments right now, but I think they use something similar.

4. Return result of your function.

   If it is None, then mp_const_none, else you need to build proper micropython object with mp_obj_new_ macros family or similar.

5. Add «magic» macros.

   If argument count is in [0..3] the use

   MP_DEFINE_CONST_FUN_OBJ_x(mod_modulename_funcname_obj, mod_modulename_funcname);

   where «x» is in [0..3] and for variable arguments count:

   MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_modulename_funcname_obj, min_args_count, max_args_count, mod_modulename_funcname);

6. Declare your module «names» structure.

   static const mp_rom_map_elem_t mp_module_modulename_globals_table[] = {
       {MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_modulename)},
   
       {MP_ROM_QSTR(MP_QSTR_funcname), MP_ROM_PTR(&mod_modulename_funcname_obj)},
   };
   

7. Declare final part of module.

   STATIC MP_DEFINE_CONST_DICT(mp_module_modulename_globals, mp_module_modulename_globals_table);
   
   const mp_obj_module_t mp_module_modulename = {
       .base = { &mp_type_module },
       .globals = (mp_obj_dict_t*)&mp_module_modulename_globals,
   };
   

8. Add your module to Makefile.

   SRC_MOD += modulename.c
   

9. Add your module to mpconfigport_freedos.h, so it will be builtin.

   extern const struct _mp_obj_module_t mp_module_modulename;
   #define MICROPY_PY_MODULENAME_DEF { MP_ROM_QSTR(MP_QSTR_modulename), MP_ROM_PTR(&mp_module_modulename) },
   
   #undef MICROPY_PORT_BUILTIN_MODULES
   #define MICROPY_PORT_BUILTIN_MODULES \
       ... \
       MICROPY_PY_MODULENAME_DEF