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.

Diff: py/objgetitemiter.c

Revision:
0:5868e8752d44
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/py/objgetitemiter.c	Sat Apr 16 17:11:56 2016 +0000
@@ -0,0 +1,76 @@
+/*
+ * 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.
+ */
+
+#include <stdlib.h>
+
+#include "py/nlr.h"
+#include "py/runtime.h"
+
+// this is a wrapper object that turns something that has a __getitem__ method into an iterator
+
+typedef struct _mp_obj_getitem_iter_t {
+    mp_obj_base_t base;
+    mp_obj_t args[3];
+} mp_obj_getitem_iter_t;
+
+STATIC mp_obj_t it_iternext(mp_obj_t self_in) {
+    mp_obj_getitem_iter_t *self = MP_OBJ_TO_PTR(self_in);
+    nlr_buf_t nlr;
+    if (nlr_push(&nlr) == 0) {
+        // try to get next item
+        mp_obj_t value = mp_call_method_n_kw(1, 0, self->args);
+        self->args[2] = MP_OBJ_NEW_SMALL_INT(MP_OBJ_SMALL_INT_VALUE(self->args[2]) + 1);
+        nlr_pop();
+        return value;
+    } else {
+        // an exception was raised
+        mp_obj_type_t *t = (mp_obj_type_t*)((mp_obj_base_t*)nlr.ret_val)->type;
+        if (t == &mp_type_StopIteration || t == &mp_type_IndexError) {
+            // return MP_OBJ_STOP_ITERATION instead of raising
+            return MP_OBJ_STOP_ITERATION;
+        } else {
+            // re-raise exception
+            nlr_jump(nlr.ret_val);
+        }
+    }
+}
+
+STATIC const mp_obj_type_t it_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_iterator,
+    .getiter = mp_identity,
+    .iternext = it_iternext,
+};
+
+// args are those returned from mp_load_method_maybe (ie either an attribute or a method)
+mp_obj_t mp_obj_new_getitem_iter(mp_obj_t *args) {
+    mp_obj_getitem_iter_t *o = m_new_obj(mp_obj_getitem_iter_t);
+    o->base.type = &it_type;
+    o->args[0] = args[0];
+    o->args[1] = args[1];
+    o->args[2] = MP_OBJ_NEW_SMALL_INT(0);
+    return MP_OBJ_FROM_PTR(o);
+}