Add microcontroller.cpu.temperature, for use as a simple sensor on minimal boards. (#211)

* Add microcontroller.cpu, the sole instance of microcontroller.Processor.
microcontroller.cpu.frequency is the clock frequency, in Hz.
microcontroller.cpu.temperature is the reading from the internal temperature sensor, in Celsius. None if not available.

* Squeeze firmware size by using -finline-limit. Otherwise non-Express builds were slightly too big.

* Update submodules.

* Fix documentation glitches

1 files changed, 107 insertions, 0 deletions

diff --git a/shared-bindings/microcontroller/Processor.c b/shared-bindings/microcontroller/Processor.c
new file mode 100644
index 000000000..0e843bd31
--- /dev/null
+++ b/shared-bindings/microcontroller/Processor.c
@@ -0,0 +1,107 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Dan Halbert for Adafruit Industries
+ *
+ * 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 "shared-bindings/microcontroller/__init__.h"
+#include "shared-bindings/microcontroller/Processor.h"
+
+#include <math.h>
+#include <stdint.h>
+
+#include "py/objproperty.h"
+
+#include "py/objproperty.h"
+#include "py/runtime.h"
+
+//| .. currentmodule:: microcontroller
+//|
+//| :class:`Processor` --- Microcontroller CPU information and control
+//| --------------------------------------------------------
+//|
+//| Get information about the microcontroller CPU and control it.
+//|
+//| Usage::
+//|
+//|    import microcontroller
+//|    print(microcontroller.cpu.frequency)
+//|    print(microcontroller.cpu.temperature)
+//|
+
+//| .. class:: Processor()
+//|
+//| You cannot create an instance of `microcontroller.Processor`.
+//| Use `microcontroller.cpu` to access the sole instance available.
+//|
+
+//| .. attribute:: frequency
+//|
+//|   Return the CPU operating frequency as an int, in Hz.
+//|
+STATIC mp_obj_t mcu_processor_get_frequency(mp_obj_t self) {
+    return mp_obj_new_int_from_uint(common_hal_mcu_processor_get_frequency());
+}
+
+MP_DEFINE_CONST_FUN_OBJ_1(mcu_processor_get_frequency_obj, mcu_processor_get_frequency);
+
+const mp_obj_property_t mcu_processor_frequency_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&mcu_processor_get_frequency_obj,  // getter
+              (mp_obj_t)&mp_const_none_obj,            // no setter
+              (mp_obj_t)&mp_const_none_obj,            // no deleter
+    },
+};
+
+//| .. attribute:: temperature
+//|
+//|   Return the on-chip temperature, in Celsius, as a float.
+//|   If the temperature is not available, return `None`.
+//|
+STATIC mp_obj_t mcu_processor_get_temperature(mp_obj_t self) {
+    float temperature = common_hal_mcu_processor_get_temperature();
+    return isnan(temperature) ? mp_const_none : mp_obj_new_float(temperature);
+}
+
+MP_DEFINE_CONST_FUN_OBJ_1(mcu_processor_get_temperature_obj, mcu_processor_get_temperature);
+
+const mp_obj_property_t mcu_processor_temperature_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&mcu_processor_get_temperature_obj,  // getter
+              (mp_obj_t)&mp_const_none_obj,            // no setter
+              (mp_obj_t)&mp_const_none_obj,            // no deleter
+    },
+};
+
+STATIC const mp_rom_map_elem_t mcu_processor_locals_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_frequency), MP_ROM_PTR(&mcu_processor_frequency_obj) },
+    { MP_ROM_QSTR(MP_QSTR_temperature), MP_ROM_PTR(&mcu_processor_temperature_obj) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(mcu_processor_locals_dict, mcu_processor_locals_dict_table);
+
+const mp_obj_type_t mcu_processor_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_Processor,
+    .locals_dict = (mp_obj_t)&mcu_processor_locals_dict,
+};