Diff: inc/core/MicroBitDevice.h

Revision:

1:8aa5cdb4ab67

Child:

47:69f452b1a5c9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/inc/core/MicroBitDevice.h	Thu Apr 07 01:33:22 2016 +0100
@@ -0,0 +1,136 @@
+/*
+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.
+*/
+
+/**
+ * Device specific funcitons for the nrf51822 device.
+ *
+ * Provides a degree of platform independence for microbit-dal functionality.
+ *
+ * TODO: Determine if any of this belongs in an mbed target definition.
+ * TODO: Review microbit-dal to place all such functions here.
+ */
+#ifndef MICROBIT_DEVICE_H
+#define MICROBIT_DEVICE_H
+
+#define MICROBIT_NAME_LENGTH                    5
+#define MICROBIT_NAME_CODE_LETTERS              5
+#define MICROBIT_PANIC_ERROR_CHARS              4
+
+#include "MicroBitConfig.h"
+#include "MicroBitMatrixMaps.h"
+
+/**
+  * Determines if a BLE stack is currently running.
+  *
+  * @return true is a bluetooth stack is operational, false otherwise.
+  */
+bool ble_running();
+
+/**
+ * Derive a unique, consistent serial number of this device from internal data.
+ *
+ * @return the serial number of this device.
+ */
+uint32_t microbit_serial_number();
+
+/**
+ * Derive the friendly name for this device, based on its serial number.
+ *
+ * @return the serial number of this device.
+ */
+char* microbit_friendly_name();
+
+/**
+  * Perform a hard reset of the micro:bit.
+  */
+void microbit_reset();
+
+/**
+  * Determine the version of microbit-dal currently running.
+  * @return a pointer to a character buffer containing a representation of the semantic version number.
+  */
+const char * microbit_dal_version();
+
+/**
+  * Disables all interrupts and user processing.
+  * Displays "=(" and an accompanying status code on the default display.
+  * @param statusCode the appropriate status code - 0 means no code will be displayed. Status codes must be in the range 0-255.
+  *
+  * @code
+  * microbit_panic(20);
+  * @endcode
+  */
+void microbit_panic(int statusCode);
+
+/**
+ * Defines the length of time that the device will remain in a error state before resetting.
+ *
+ * @param iteration The number of times the error code will be displayed before resetting. Set to zero to remain in error state forever.
+ *
+ * @code
+ * microbit_panic_timeout(4);
+ * @endcode
+ */
+void microbit_panic_timeout(int iterations);
+
+/**
+  * Generate a random number in the given range.
+  * We use a simple Galois LFSR random number generator here,
+  * as a Galois LFSR is sufficient for our applications, and much more lightweight
+  * than the hardware random number generator built int the processor, which takes
+  * a long time and uses a lot of energy.
+  *
+  * KIDS: You shouldn't use this is the real world to generte cryptographic keys though...
+  * have a think why not. :-)
+  *
+  * @param max the upper range to generate a number for. This number cannot be negative.
+  *
+  * @return A random, natural number between 0 and the max-1. Or MICROBIT_INVALID_VALUE if max is <= 0.
+  *
+  * @code
+  * microbit_random(200); //a number between 0 and 199
+  * @endcode
+  */
+int microbit_random(int max);
+
+/**
+  * Seed the random number generator (RNG).
+  *
+  * This function uses the NRF51822's in built cryptographic random number generator to seed a Galois LFSR.
+  * We do this as the hardware RNG is relatively high power, and is locked out by the BLE stack internally,
+  * with a less than optimal application interface. A Galois LFSR is sufficient for our
+  * applications, and much more lightweight.
+  */
+void microbit_seed_random();
+
+/**
+  * Seed the pseudo random number generator (RNG) using the given 32-bit value.
+  * This function does not use the NRF51822's in built cryptographic random number generator.
+  *
+  * @param seed The value to use as a seed.
+  */
+void microbit_seed_random(uint32_t seed);
+
+#endif