Colin Hogben / micropython

Port of MicroPython to the mbed platform. See micropython-repl for an interactive program.

Dependents:   micropython-repl

This a port of MicroPython to the mbed Classic platform.

This provides an interpreter running on the board's USB serial connection.

Getting Started

Import the micropython-repl program into your IDE workspace on developer.mbed.org. Compile and download to your board. Connect to the USB serial port in your usual manner. You should get a startup message similar to the following:

  MicroPython v1.7-155-gdddcdd8 on 2016-04-23; K64F with ARM
  Type "help()" for more information.
  >>>

Then you can start using micropython. For example:

  >>> from mbed import DigitalOut
  >>> from pins import LED1
  >>> led = DigitalOut(LED1)
  >>> led.write(1)

Requirements

You need approximately 100K of flash memory, so this will be no good for boards with smaller amounts of storage.

Caveats

This can be considered an alpha release of the port; things may not work; APIs may change in later releases. It is NOT an official part part the micropython project, so if anything doesn't work, blame me. If it does work, most of the credit is due to micropython.

  • Only a few of the mbed classes are available in micropython so far, and not all methods of those that are.
  • Only a few boards have their full range of pin names available; for others, only a few standard ones (USBTX, USBRX, LED1) are implemented.
  • The garbage collector is not yet implemented. The interpreter will gradually consume memory and then fail.
  • Exceptions from the mbed classes are not yet handled.
  • Asynchronous processing (e.g. events on inputs) is not supported.

Credits

  • Damien P. George and other contributors who created micropython.
  • Colin Hogben, author of this port.

py/nlr.h

Committer:
pythontech
Date:
2016-04-16
Revision:
0:5868e8752d44

File content as of revision 0:5868e8752d44:

/*
 * This file is part of the Micro Python project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013, 2014 Damien P. George
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#ifndef __MICROPY_INCLUDED_PY_NLR_H__
#define __MICROPY_INCLUDED_PY_NLR_H__

// non-local return
// exception handling, basically a stack of setjmp/longjmp buffers

#include <limits.h>
#include <setjmp.h>
#include <assert.h>

#include "py/mpconfig.h"

typedef struct _nlr_buf_t nlr_buf_t;
struct _nlr_buf_t {
    // the entries here must all be machine word size
    nlr_buf_t *prev;
    void *ret_val; // always a concrete object (an exception instance)
#if !defined(MICROPY_NLR_SETJMP) || !MICROPY_NLR_SETJMP
#if defined(__i386__)
    void *regs[6];
#elif defined(__x86_64__)
  #if defined(__CYGWIN__)
    void *regs[12];
  #else
    void *regs[8];
  #endif
#elif defined(__thumb2__) || defined(__thumb__) || defined(__arm__)
    void *regs[10];
#elif defined(__xtensa__)
    void *regs[10];
#else
    #define MICROPY_NLR_SETJMP (1)
    //#warning "No native NLR support for this arch, using setjmp implementation"
#endif
#endif

#if MICROPY_NLR_SETJMP
    jmp_buf jmpbuf;
#endif
};

#if MICROPY_NLR_SETJMP
#include "py/mpstate.h"

NORETURN void nlr_setjmp_jump(void *val);
// nlr_push() must be defined as a macro, because "The stack context will be
// invalidated if the function which called setjmp() returns."
#define nlr_push(buf) ((buf)->prev = MP_STATE_VM(nlr_top), MP_STATE_VM(nlr_top) = (buf), setjmp((buf)->jmpbuf))
#define nlr_pop() { MP_STATE_VM(nlr_top) = MP_STATE_VM(nlr_top)->prev; }
#define nlr_jump(val) nlr_setjmp_jump(val)
#else
unsigned int nlr_push(nlr_buf_t *);
void nlr_pop(void);
NORETURN void nlr_jump(void *val);
#endif

// This must be implemented by a port.  It's called by nlr_jump
// if no nlr buf has been pushed.  It must not return, but rather
// should bail out with a fatal error.
void nlr_jump_fail(void *val);

// use nlr_raise instead of nlr_jump so that debugging is easier
#ifndef DEBUG
#define nlr_raise(val) nlr_jump(MP_OBJ_TO_PTR(val))
#else
#include "mpstate.h"
#define nlr_raise(val) \
    do { \
        /*printf("nlr_raise: nlr_top=%p\n", MP_STATE_VM(nlr_top)); \
        fflush(stdout);*/ \
        void *_val = MP_OBJ_TO_PTR(val); \
        assert(_val != NULL); \
        assert(mp_obj_is_exception_instance(val)); \
        nlr_jump(_val); \
    } while (0)

#if !MICROPY_NLR_SETJMP
#define nlr_push(val) \
    assert(MP_STATE_VM(nlr_top) != val),nlr_push(val)

/*
#define nlr_push(val) \
    printf("nlr_push: before: nlr_top=%p, val=%p\n", MP_STATE_VM(nlr_top), val),assert(MP_STATE_VM(nlr_top) != val),nlr_push(val)
#endif
*/
#endif

#endif

#endif // __MICROPY_INCLUDED_PY_NLR_H__