sen data via radio to other microbits accept command via radio bufixes
Dependencies: BLE_API nRF51822 mbed-dev-bin
Diff: source/bluetooth/MicroBitLEDService.cpp
- Revision:
- 1:8aa5cdb4ab67
diff -r fb15f7887843 -r 8aa5cdb4ab67 source/bluetooth/MicroBitLEDService.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/source/bluetooth/MicroBitLEDService.cpp Thu Apr 07 01:33:22 2016 +0100 @@ -0,0 +1,150 @@ +/* +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. +*/ + +/** + * Class definition for the custom MicroBit LED Service. + * Provides a BLE service to remotely read and write the state of the LED display. + */ +#include "MicroBitConfig.h" +#include "ble/UUID.h" + +#include "MicroBitLEDService.h" + +/** + * Constructor. + * Create a representation of the LEDService + * @param _ble The instance of a BLE device that we're running on. + * @param _display An instance of MicroBitDisplay to interface with. + */ +MicroBitLEDService::MicroBitLEDService(BLEDevice &_ble, MicroBitDisplay &_display) : + ble(_ble), display(_display), + matrixCharacteristic(MicroBitLEDServiceMatrixUUID, (uint8_t *)&matrixCharacteristicBuffer, 0, sizeof(matrixCharacteristicBuffer), + GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ) +{ + // Create the data structures that represent each of our characteristics in Soft Device. + GattCharacteristic textCharacteristic(MicroBitLEDServiceTextUUID, (uint8_t *)textCharacteristicBuffer, 0, MICROBIT_BLE_MAXIMUM_SCROLLTEXT, + GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE); + + GattCharacteristic scrollingSpeedCharacteristic(MicroBitLEDServiceScrollingSpeedUUID, (uint8_t *)&scrollingSpeedCharacteristicBuffer, 0, + sizeof(scrollingSpeedCharacteristicBuffer), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ); + + // Initialise our characteristic values. + memclr(matrixCharacteristicBuffer, sizeof(matrixCharacteristicBuffer)); + textCharacteristicBuffer[0] = 0; + scrollingSpeedCharacteristicBuffer = MICROBIT_DEFAULT_SCROLL_SPEED; + + matrixCharacteristic.setReadAuthorizationCallback(this, &MicroBitLEDService::onDataRead); + + // Set default security requirements + matrixCharacteristic.requireSecurity(SecurityManager::MICROBIT_BLE_SECURITY_LEVEL); + textCharacteristic.requireSecurity(SecurityManager::MICROBIT_BLE_SECURITY_LEVEL); + scrollingSpeedCharacteristic.requireSecurity(SecurityManager::MICROBIT_BLE_SECURITY_LEVEL); + + GattCharacteristic *characteristics[] = {&matrixCharacteristic, &textCharacteristic, &scrollingSpeedCharacteristic}; + GattService service(MicroBitLEDServiceUUID, characteristics, sizeof(characteristics) / sizeof(GattCharacteristic *)); + + ble.addService(service); + + matrixCharacteristicHandle = matrixCharacteristic.getValueHandle(); + textCharacteristicHandle = textCharacteristic.getValueHandle(); + scrollingSpeedCharacteristicHandle = scrollingSpeedCharacteristic.getValueHandle(); + + ble.gattServer().write(scrollingSpeedCharacteristicHandle, (const uint8_t *)&scrollingSpeedCharacteristicBuffer, sizeof(scrollingSpeedCharacteristicBuffer)); + ble.gattServer().write(matrixCharacteristicHandle, (const uint8_t *)&matrixCharacteristicBuffer, sizeof(matrixCharacteristicBuffer)); + + ble.onDataWritten(this, &MicroBitLEDService::onDataWritten); +} + + +/** + * Callback. Invoked when any of our attributes are written via BLE. + */ +void MicroBitLEDService::onDataWritten(const GattWriteCallbackParams *params) +{ + uint8_t *data = (uint8_t *)params->data; + + if (params->handle == matrixCharacteristicHandle && params->len > 0 && params->len < 6) + { + for (int y=0; y<params->len; y++) + for (int x=0; x<5; x++) + display.image.setPixelValue(x, y, (data[y] & (0x01 << (4-x))) ? 255 : 0); + } + + else if (params->handle == textCharacteristicHandle) + { + // Create a ManagedString representation from the UTF8 data. + // We do this explicitly to control the length (in case the string is not NULL terminated!) + ManagedString s((char *)params->data, params->len); + + // Start the string scrolling and we're done. + display.scrollAsync(s, (int) scrollingSpeedCharacteristicBuffer); + } + + else if (params->handle == scrollingSpeedCharacteristicHandle && params->len >= sizeof(scrollingSpeedCharacteristicBuffer)) + { + // Read the speed requested, and store it locally. + // We use this as the speed for all scroll operations subsquently initiated from BLE. + scrollingSpeedCharacteristicBuffer = *((uint16_t *)params->data); + } +} + +/** + * Callback. Invoked when any of our attributes are read via BLE. + */ +void MicroBitLEDService::onDataRead(GattReadAuthCallbackParams *params) +{ + if (params->handle == matrixCharacteristicHandle) + { + for (int y=0; y<5; y++) + { + matrixCharacteristicBuffer[y] = 0; + + for (int x=0; x<5; x++) + { + if (display.image.getPixelValue(x, y)) + matrixCharacteristicBuffer[y] |= 0x01 << (4-x); + } + } + + ble.gattServer().write(matrixCharacteristicHandle, (const uint8_t *)&matrixCharacteristicBuffer, sizeof(matrixCharacteristicBuffer)); + } +} + + +const uint8_t MicroBitLEDServiceUUID[] = { + 0xe9,0x5d,0xd9,0x1d,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8 +}; + +const uint8_t MicroBitLEDServiceMatrixUUID[] = { + 0xe9,0x5d,0x7b,0x77,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8 +}; + +const uint8_t MicroBitLEDServiceTextUUID[] = { + 0xe9,0x5d,0x93,0xee,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8 +}; + +const uint8_t MicroBitLEDServiceScrollingSpeedUUID[] = { + 0xe9,0x5d,0x0d,0x2d,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8 +};