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microbit-dal/source/MicroBitIO.cpp

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microbit-dal: Initial Commit This is the first commit of the microbit-dal on GitHub. This repository contains the runtime, which is a light weight operating system developed by Lancaster University.
2015-08-12 10:53:41 +00:00
/**
* Class definition for MicroBit IO.
*
* Represents a single IO pin on the edge connector.
*/
microbit: Memory Optimisation Mega Update This release contains a widespread set of updates and optimisations to the micro:bit runtime, with a view to reducing the SRAM footprint of the whole system. This is to provide as much usable HEAP storage for application programs as possible. Specific updates and optimisations include: - Additional compilation flags to allow the core micro:bit runtime to be configured. These are defined in MicroBitConfig.h - A custom heap allocator. This is now included for two reasons: 1) To provide a simple mechanism to to utilise both the mbed heap space and other memory regions (such as unused memory in the SoftDevice region) as a single virtual heap. 2) To address some issues that have been noted that are attributable to heap fragmentation. The micro:bit heap allocator has a simple algorithm, but one that is chosen to respond well to the relativelt high 'heap churn' found in the micro:bit environment. All micro:bit components and user programs now use this heap allocator trasparently. - Updates to BLE services to remove persistent references to their GATT services. This consumes vast amounts SRAM, rather unecessarily. Instead only handles to the relevant GATT characteristics are now stored. This specifically includes: + MicroBitDFUService + MicroBitEventService + DeviceInformationService - Updates to the Fiber scheduler to save SRAM. More specifically: + Removed the need to hold an empty processor context to intialise fibers. + The IDLE fiber now runs without a stack + fiber stacks are now only created when a fiber is descheduled for the first time, thereby reducing heap churn. + the 'main' fiber is now recycled into the fiber_pool if it leaves app_main() + fibers created through invoke() now only maintains the necessary part of teh parent stack that is needed, thereby reducing the stack size of spawned fibers. - Updates to the Message Bus to reduce the overall memory footprint of processing events. More specifically: + Event handlers are now always called using invoke(), such that non-blocking event handlers no longer need a dedicated fiber to execute - thereby saving SRAM and processor time. + Processing of events from the event queue is now rate paced. Events only continue to be processed as long as there are no fibers on the run queue. i.e. event processing is no longer greedy, thereby reducing the number of fibers created on the runqueue. - Updates to BLUEZOENE code to bring up core BLE services even if they are not enabled by default. This allows programs that do not require BLE to operate to benefit from the full range of SRAM, whilst still allowing the device to be programmed over BLE. - Updates to the Soft Device initialisation configuration, reducing the size of the GATT table held in the top 1.8K of its 8K memory region to around 800 bytes. This is sufficient to run the default set of BLE services on the micro:bit so the additional memory is configured as HEAP storage by MicroBitHeapAllocator. - Minor changes to a range of components to integrate with the above changes. + rename of free() to release() in DynamicPWM to avoid namespace collision with MicroBitHeap free() + rename of fork_on_block to invoke() to enhance readbility. - Many code cleanups and updates to out of date comments.
2015-08-31 22:25:10 +00:00
#include "MicroBitIO.h"
microbit-dal: Initial Commit This is the first commit of the microbit-dal on GitHub. This repository contains the runtime, which is a light weight operating system developed by Lancaster University.
2015-08-12 10:53:41 +00:00
/**
* Constructor.
* Create a representation of all given I/O pins on the edge connector
*/
MicroBitIO::MicroBitIO(int MICROBIT_ID_IO_P0, int MICROBIT_ID_IO_P1, int MICROBIT_ID_IO_P2,
int MICROBIT_ID_IO_P3, int MICROBIT_ID_IO_P4, int MICROBIT_ID_IO_P5,
int MICROBIT_ID_IO_P6, int MICROBIT_ID_IO_P7, int MICROBIT_ID_IO_P8,
int MICROBIT_ID_IO_P9, int MICROBIT_ID_IO_P10,int MICROBIT_ID_IO_P11,
int MICROBIT_ID_IO_P12,int MICROBIT_ID_IO_P13,int MICROBIT_ID_IO_P14,
int MICROBIT_ID_IO_P15,int MICROBIT_ID_IO_P16,int MICROBIT_ID_IO_P19,
int MICROBIT_ID_IO_P20) :
P0 (MICROBIT_ID_IO_P0, MICROBIT_PIN_P0, PIN_CAPABILITY_ALL), //P0 is the left most pad (ANALOG/DIGITAL/TOUCH)
P1 (MICROBIT_ID_IO_P1, MICROBIT_PIN_P1, PIN_CAPABILITY_ALL), //P1 is the middle pad (ANALOG/DIGITAL/TOUCH)
P2 (MICROBIT_ID_IO_P2, MICROBIT_PIN_P2, PIN_CAPABILITY_ALL), //P2 is the right most pad (ANALOG/DIGITAL/TOUCH)
P3 (MICROBIT_ID_IO_P3, MICROBIT_PIN_P3, PIN_CAPABILITY_AD), //COL1 (ANALOG/DIGITAL)
P4 (MICROBIT_ID_IO_P4, MICROBIT_PIN_P4, PIN_CAPABILITY_DIGITAL), //BTN_A
P5 (MICROBIT_ID_IO_P5, MICROBIT_PIN_P5, PIN_CAPABILITY_AD), //COL2 (ANALOG/DIGITAL)
P6 (MICROBIT_ID_IO_P6, MICROBIT_PIN_P6, PIN_CAPABILITY_DIGITAL), //ROW2
P7 (MICROBIT_ID_IO_P7, MICROBIT_PIN_P7, PIN_CAPABILITY_DIGITAL), //ROW1
P8 (MICROBIT_ID_IO_P8, MICROBIT_PIN_P8, PIN_CAPABILITY_DIGITAL), //PIN 18
P9 (MICROBIT_ID_IO_P9, MICROBIT_PIN_P9, PIN_CAPABILITY_DIGITAL), //ROW3
P10(MICROBIT_ID_IO_P10,MICROBIT_PIN_P10,PIN_CAPABILITY_AD), //COL3 (ANALOG/DIGITAL)
P11(MICROBIT_ID_IO_P11,MICROBIT_PIN_P11,PIN_CAPABILITY_DIGITAL), //BTN_B
P12(MICROBIT_ID_IO_P12,MICROBIT_PIN_P12,PIN_CAPABILITY_DIGITAL), //PIN 20
P13(MICROBIT_ID_IO_P13,MICROBIT_PIN_P13,PIN_CAPABILITY_DIGITAL), //SCK
P14(MICROBIT_ID_IO_P14,MICROBIT_PIN_P14,PIN_CAPABILITY_DIGITAL), //MISO
P15(MICROBIT_ID_IO_P15,MICROBIT_PIN_P15,PIN_CAPABILITY_DIGITAL), //MOSI
P16(MICROBIT_ID_IO_P16,MICROBIT_PIN_P16,PIN_CAPABILITY_DIGITAL), //PIN 16
P19(MICROBIT_ID_IO_P19,MICROBIT_PIN_P19,PIN_CAPABILITY_DIGITAL), //SCL
P20(MICROBIT_ID_IO_P20,MICROBIT_PIN_P20,PIN_CAPABILITY_DIGITAL) //SDA
{
}
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