Diff: microbit/source/MicroBit.cpp

Revision:

0:b9164b348919

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/microbit/source/MicroBit.cpp	Mon Oct 17 12:41:20 2016 +0000
@@ -0,0 +1,223 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2016 British Broadcasting Corporation.
+This software is provided by Lancaster University by arrangement with the BBC.
+
+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 "MicroBitConfig.h"
+/*
+ * The underlying Nordic libraries that support BLE do not compile cleanly with the stringent GCC settings we employ
+ * If we're compiling under GCC, then we suppress any warnings generated from this code (but not the rest of the DAL)
+ * The ARM cc compiler is more tolerant. We don't test __GNUC__ here to detect GCC as ARMCC also typically sets this
+ * as a compatability option, but does not support the options used...
+ */
+#if !defined(__arm)
+#pragma GCC diagnostic ignored "-Wunused-function"
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#endif
+
+#include "MicroBit.h"
+
+#include "nrf_soc.h"
+
+/*
+ * Return to our predefined compiler settings.
+ */
+#if !defined(__arm)
+#pragma GCC diagnostic pop
+#endif
+
+#if CONFIG_ENABLED(MICROBIT_DBG)
+// We create and initialize to NULL here, but MicroBitSerial will automatically update this as needed in its constructor.
+RawSerial* SERIAL_DEBUG = NULL;
+#endif
+
+/**
+  * Constructor.
+  *
+  * Create a representation of a MicroBit device, which includes member variables
+  * that represent various device drivers used to control aspects of the micro:bit.
+  */
+MicroBit::MicroBit() :
+    serial(USBTX, USBRX),
+	resetButton(MICROBIT_PIN_BUTTON_RESET),
+    storage(),
+    i2c(I2C_SDA0, I2C_SCL0),
+    messageBus(),
+    display(),
+    buttonA(MICROBIT_PIN_BUTTON_A, MICROBIT_ID_BUTTON_A),
+    buttonB(MICROBIT_PIN_BUTTON_B, MICROBIT_ID_BUTTON_B),
+    buttonAB(MICROBIT_ID_BUTTON_A,MICROBIT_ID_BUTTON_B, MICROBIT_ID_BUTTON_AB),
+    accelerometer(i2c),
+    compass(i2c, accelerometer, storage),
+    compassCalibrator(compass, accelerometer, display),
+    thermometer(storage),
+    io(MICROBIT_ID_IO_P0,MICROBIT_ID_IO_P1,MICROBIT_ID_IO_P2,
+       MICROBIT_ID_IO_P3,MICROBIT_ID_IO_P4,MICROBIT_ID_IO_P5,
+       MICROBIT_ID_IO_P6,MICROBIT_ID_IO_P7,MICROBIT_ID_IO_P8,
+       MICROBIT_ID_IO_P9,MICROBIT_ID_IO_P10,MICROBIT_ID_IO_P11,
+       MICROBIT_ID_IO_P12,MICROBIT_ID_IO_P13,MICROBIT_ID_IO_P14,
+       MICROBIT_ID_IO_P15,MICROBIT_ID_IO_P16,MICROBIT_ID_IO_P19,
+       MICROBIT_ID_IO_P20),
+    bleManager(storage),
+    radio(),
+    ble(NULL)
+{
+    // Clear our status
+    status = 0;
+
+    // Bring up soft reset functionality as soon as possible.
+    resetButton.mode(PullUp);
+    resetButton.fall(this, &MicroBit::reset);
+}
+
+/**
+  * Post constructor initialisation method.
+  *
+  * This call will initialised the scheduler, memory allocator and Bluetooth stack.
+  *
+  * This is required as the Bluetooth stack can't be brought up in a
+  * static context i.e. in a constructor.
+  *
+  * @code
+  * uBit.init();
+  * @endcode
+  *
+  * @note This method must be called before user code utilises any functionality
+  *       contained by uBit.
+  */
+void MicroBit::init()
+{
+    if (status & MICROBIT_INITIALIZED)
+        return;
+
+#if CONFIG_ENABLED(MICROBIT_HEAP_ALLOCATOR)
+    // Bring up a nested heap allocator.
+    microbit_create_nested_heap(MICROBIT_NESTED_HEAP_SIZE);
+#endif
+
+    // Bring up fiber scheduler.
+    scheduler_init(messageBus);
+
+    // Seed our random number generator
+    seedRandom();
+
+    // Create an event handler to trap any handlers being created for I2C services.
+    // We do this to enable initialisation of those services only when they're used,
+    // which saves processor time, memeory and battery life.
+    messageBus.listen(MICROBIT_ID_MESSAGE_BUS_LISTENER, MICROBIT_EVT_ANY, this, &MicroBit::onListenerRegisteredEvent);
+
+    status |= MICROBIT_INITIALIZED;
+
+#if CONFIG_ENABLED(MICROBIT_BLE_PAIRING_MODE)
+    // Test if we need to enter BLE pairing mode...
+    int i=0;
+    sleep(100);
+    while (buttonA.isPressed() && buttonB.isPressed() && i<10)
+    {
+        sleep(100);
+        i++;
+
+        if (i == 10)
+        {
+#if CONFIG_ENABLED(MICROBIT_HEAP_ALLOCATOR) && CONFIG_ENABLED(MICROBIT_HEAP_REUSE_SD)
+            microbit_create_heap(MICROBIT_SD_GATT_TABLE_START + MICROBIT_SD_GATT_TABLE_SIZE, MICROBIT_SD_LIMIT);
+#endif
+            // Start the BLE stack, if it isn't already running.
+            if (!ble)
+            {
+                bleManager.init(getName(), getSerial(), messageBus, true);
+                ble = bleManager.ble;
+            }
+
+            // Enter pairing mode, using the LED matrix for any necessary pairing operations
+            bleManager.pairingMode(display, buttonA);
+        }
+    }
+#endif
+
+    // Attempt to bring up a second heap region, using unused memory normally reserved for Soft Device.
+#if CONFIG_ENABLED(MICROBIT_HEAP_ALLOCATOR) && CONFIG_ENABLED(MICROBIT_HEAP_REUSE_SD)
+#if CONFIG_ENABLED(MICROBIT_BLE_ENABLED)
+    microbit_create_heap(MICROBIT_SD_GATT_TABLE_START + MICROBIT_SD_GATT_TABLE_SIZE, MICROBIT_SD_LIMIT);
+#else
+    microbit_create_heap(MICROBIT_SRAM_BASE, MICROBIT_SD_LIMIT);
+#endif
+#endif
+
+#if CONFIG_ENABLED(MICROBIT_BLE_ENABLED)
+    // Start the BLE stack, if it isn't already running.
+    if (!ble)
+    {
+        bleManager.init(getName(), getSerial(), messageBus, false);
+        ble = bleManager.ble;
+    }
+#endif
+}
+
+/**
+  * A listener to perform actions as a result of Message Bus reflection.
+  *
+  * In some cases we want to perform lazy instantiation of components, such as
+  * the compass and the accelerometer, where we only want to add them to the idle
+  * fiber when someone has the intention of using these components.
+  */
+void MicroBit::onListenerRegisteredEvent(MicroBitEvent evt)
+{
+    switch(evt.value)
+    {
+        case MICROBIT_ID_BUTTON_AB:
+            // A user has registered to receive events from the buttonAB multibutton.
+            // Disable click events from being generated by ButtonA and ButtonB, and defer the
+            // control of this to the multibutton handler.
+            //
+            // This way, buttons look independent unless a buttonAB is requested, at which
+            // point button A+B clicks can be correclty handled without breaking
+            // causal ordering.
+            buttonA.setEventConfiguration(MICROBIT_BUTTON_SIMPLE_EVENTS);
+            buttonB.setEventConfiguration(MICROBIT_BUTTON_SIMPLE_EVENTS);
+            buttonAB.setEventConfiguration(MICROBIT_BUTTON_ALL_EVENTS);
+            break;
+
+        case MICROBIT_ID_COMPASS:
+            // A listener has been registered for the compass.
+            // The compass uses lazy instantiation, we just need to read the data once to start it running.
+            // Touch the compass through the heading() function to ensure it is calibrated. if it isn't this will launch any associated calibration algorithms.
+            compass.heading();
+
+            break;
+
+        case MICROBIT_ID_ACCELEROMETER:
+        case MICROBIT_ID_GESTURE:
+            // A listener has been registered for the accelerometer.
+            // The accelerometer uses lazy instantiation, we just need to read the data once to start it running.
+            accelerometer.updateSample();
+            break;
+
+        case MICROBIT_ID_THERMOMETER:
+            // A listener has been registered for the thermometer.
+            // The thermometer uses lazy instantiation, we just need to read the data once to start it running.
+            thermometer.updateSample();
+            break;
+    }
+}
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