UCL IoT / Mbed 2 deprecated BLE_LED_Controller

Application for nRF51822 mbed KIT that controls the intensity of LED2 using the BLE UART Service. Works with the Android App BLE_mbed_Remote available here https://github.com/bennthomsen/BLE_mbed_Remote

Dependencies:   BLE_API mbed nRF51822

Fork of BLE_UART_LEDControl_Echo by UCL IoT

This program demonstrates the use of the BLE UART Service to receive and send commands in order to remotely control the operation. In this example the intensity of LED2 can be remotely controlled.

The program accepts commands of the form "led2 0.1" over the BLE UART Service and uses these to set the duty cycle of the PWM Output that is connected to LED2 on the nRF51822 mbed KIT.

An Example Android App is available here https://github.com/bennthomsen/BLE_mbed_Remote. The complete source code and Android Studio Project files are available and can simply be pulled into Android Studio. The App implements sending of text, LED on off Button and a slider to control the LED brightness. At this stage setting the switch to off sets the PWM duty cycle to 0.0, however due to the PWMOut implementation in mbed the LED is not completely off at this point.

main.cpp@5:4bc41267a03a, 2014-09-02 (annotated)

Committer:
rgrover1
Date:
Tue Sep 02 16:32:58 2014 +0000
Revision:
5:4bc41267a03a
Parent:
2:e060367b9024
Child:
6:e0fc9072e853
updating underlying libraries.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yihui 0:e910d9bb040f 1 /* mbed Microcontroller Library
yihui 0:e910d9bb040f 2 * Copyright (c) 2006-2013 ARM Limited
yihui 0:e910d9bb040f 3 *
yihui 0:e910d9bb040f 4 * Licensed under the Apache License, Version 2.0 (the "License");
yihui 0:e910d9bb040f 5 * you may not use this file except in compliance with the License.
yihui 0:e910d9bb040f 6 * You may obtain a copy of the License at
yihui 0:e910d9bb040f 7 *
yihui 0:e910d9bb040f 8 * http://www.apache.org/licenses/LICENSE-2.0
yihui 0:e910d9bb040f 9 *
yihui 0:e910d9bb040f 10 * Unless required by applicable law or agreed to in writing, software
yihui 0:e910d9bb040f 11 * distributed under the License is distributed on an "AS IS" BASIS,
yihui 0:e910d9bb040f 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
yihui 0:e910d9bb040f 13 * See the License for the specific language governing permissions and
yihui 0:e910d9bb040f 14 * limitations under the License.
yihui 0:e910d9bb040f 15 */
yihui 0:e910d9bb040f 16
yihui 0:e910d9bb040f 17 #include "mbed.h"
Rohit Grover 2:e060367b9024 18 #include "BLEDevice.h"
yihui 0:e910d9bb040f 19
Rohit Grover 2:e060367b9024 20 #define BLE_UUID_NUS_SERVICE 0x0001 /**< The UUID of the Nordic UART Service. */
Rohit Grover 2:e060367b9024 21 #define BLE_UUID_NUS_TX_CHARACTERISTIC 0x0002 /**< The UUID of the TX Characteristic. */
Rohit Grover 2:e060367b9024 22 #define BLE_UUID_NUS_RX_CHARACTERISTIC 0x0003 /**< The UUID of the RX Characteristic. */
yihui 0:e910d9bb040f 23
rgrover1 5:4bc41267a03a 24 #define NEED_CONSOLE_OUTPUT 1 /* Set this if you need debug messages on the console;
Rohit Grover 2:e060367b9024 25 * it will have an impact on code-size and power consumption. */
yihui 0:e910d9bb040f 26
Rohit Grover 2:e060367b9024 27 #if NEED_CONSOLE_OUTPUT
Rohit Grover 2:e060367b9024 28 Serial pc(USBTX, USBRX);
Rohit Grover 2:e060367b9024 29 #define DEBUG(...) { pc.printf(__VA_ARGS__); }
yihui 0:e910d9bb040f 30 #else
Rohit Grover 2:e060367b9024 31 #define DEBUG(...) /* nothing */
Rohit Grover 2:e060367b9024 32 #endif /* #if NEED_CONSOLE_OUTPUT */
yihui 0:e910d9bb040f 33
Rohit Grover 2:e060367b9024 34 BLEDevice ble;
Rohit Grover 2:e060367b9024 35 DigitalOut led1(LED1);
yihui 0:e910d9bb040f 36
yihui 0:e910d9bb040f 37 // The Nordic UART Service
Rohit Grover 2:e060367b9024 38 static const uint8_t uart_base_uuid[] = {0x6e, 0x40, 0x00, 0x01, 0xb5, 0xa3, 0xf3, 0x93, 0xe0, 0xa9, 0xe5,0x0e, 0x24, 0xdc, 0xca, 0x9e};
Rohit Grover 2:e060367b9024 39 static const uint8_t uart_tx_uuid[] = {0x6e, 0x40, 0x00, 0x02, 0xb5, 0xa3, 0xf3, 0x93, 0xe0, 0xa9, 0xe5,0x0e, 0x24, 0xdc, 0xca, 0x9e};
Rohit Grover 2:e060367b9024 40 static const uint8_t uart_rx_uuid[] = {0x6e, 0x40, 0x00, 0x03, 0xb5, 0xa3, 0xf3, 0x93, 0xe0, 0xa9, 0xe5,0x0e, 0x24, 0xdc, 0xca, 0x9e};
Rohit Grover 2:e060367b9024 41 static const uint8_t uart_base_uuid_rev[] = {0x9e, 0xca, 0xdc, 0x24, 0x0e, 0xe5, 0xa9, 0xe0, 0x93, 0xf3, 0xa3, 0xb5, 0x01, 0x00, 0x40, 0x6e};
rgrover1 5:4bc41267a03a 42
rgrover1 5:4bc41267a03a 43 static const uint8_t SIZEOF_TX_RX_BUFFER = 128;
rgrover1 5:4bc41267a03a 44 uint8_t rxPayload[SIZEOF_TX_RX_BUFFER] = {0,};
rgrover1 5:4bc41267a03a 45 uint8_t txPayload[SIZEOF_TX_RX_BUFFER] = {0,};
rgrover1 5:4bc41267a03a 46 GattCharacteristic rxCharacteristic (uart_tx_uuid, rxPayload, 1, SIZEOF_TX_RX_BUFFER,
Rohit Grover 2:e060367b9024 47 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE_WITHOUT_RESPONSE);
rgrover1 5:4bc41267a03a 48 GattCharacteristic txCharacteristic (uart_rx_uuid, txPayload, 1, SIZEOF_TX_RX_BUFFER, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
rgrover1 5:4bc41267a03a 49 GattCharacteristic *uartChars[] = {&rxCharacteristic, &txCharacteristic};
Rohit Grover 2:e060367b9024 50 GattService uartService(uart_base_uuid, uartChars, sizeof(uartChars) / sizeof(GattCharacteristic *));
yihui 0:e910d9bb040f 51
rgrover1 5:4bc41267a03a 52 void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason)
yihui 0:e910d9bb040f 53 {
Rohit Grover 2:e060367b9024 54 DEBUG("Disconnected!\n\r");
Rohit Grover 2:e060367b9024 55 DEBUG("Restarting the advertising process\n\r");
Rohit Grover 2:e060367b9024 56 ble.startAdvertising();
Rohit Grover 2:e060367b9024 57 }
yihui 0:e910d9bb040f 58
rgrover1 5:4bc41267a03a 59 void onDataWritten(uint16_t charHandle, const GattCharacteristicWriteCBParams *params)
yihui 0:e910d9bb040f 60 {
rgrover1 5:4bc41267a03a 61 if (charHandle == rxCharacteristic.getValueAttribute().getHandle()) {
rgrover1 5:4bc41267a03a 62 uint16_t bytesRead = params->len;
rgrover1 5:4bc41267a03a 63 DEBUG("received %u bytes\n\r", bytesRead);
rgrover1 5:4bc41267a03a 64 if (bytesRead < sizeof(rxPayload)) {
rgrover1 5:4bc41267a03a 65 memcpy(rxPayload, params->data, bytesRead);
rgrover1 5:4bc41267a03a 66 rxPayload[bytesRead] = 0;
rgrover1 5:4bc41267a03a 67 }
rgrover1 5:4bc41267a03a 68 DEBUG("ECHO: %s\n\r", (char *)rxPayload);
rgrover1 5:4bc41267a03a 69 ble.updateCharacteristicValue(txCharacteristic.getValueAttribute().getHandle(), rxPayload, bytesRead);
yihui 0:e910d9bb040f 70 }
Rohit Grover 2:e060367b9024 71 }
yihui 0:e910d9bb040f 72
Rohit Grover 2:e060367b9024 73 void periodicCallback(void)
Rohit Grover 2:e060367b9024 74 {
Rohit Grover 2:e060367b9024 75 led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
Rohit Grover 2:e060367b9024 76 }
yihui 0:e910d9bb040f 77
yihui 0:e910d9bb040f 78 int main(void)
yihui 0:e910d9bb040f 79 {
Rohit Grover 2:e060367b9024 80 led1 = 1;
Rohit Grover 2:e060367b9024 81 Ticker ticker;
Rohit Grover 2:e060367b9024 82 ticker.attach(periodicCallback, 1);
yihui 0:e910d9bb040f 83
Rohit Grover 2:e060367b9024 84 DEBUG("Initialising the nRF51822\n\r");
Rohit Grover 2:e060367b9024 85 ble.init();
Rohit Grover 2:e060367b9024 86 ble.onDisconnection(disconnectionCallback);
Rohit Grover 2:e060367b9024 87 ble.onDataWritten(onDataWritten);
yihui 0:e910d9bb040f 88
Rohit Grover 2:e060367b9024 89 /* setup advertising */
Rohit Grover 2:e060367b9024 90 ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED);
Rohit Grover 2:e060367b9024 91 ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
Rohit Grover 2:e060367b9024 92 ble.accumulateAdvertisingPayload(GapAdvertisingData::SHORTENED_LOCAL_NAME,
Rohit Grover 2:e060367b9024 93 (const uint8_t *)"BLE UART", sizeof("BLE UART") - 1);
Rohit Grover 2:e060367b9024 94 ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_128BIT_SERVICE_IDS,
Rohit Grover 2:e060367b9024 95 (const uint8_t *)uart_base_uuid_rev, sizeof(uart_base_uuid));
yihui 0:e910d9bb040f 96
Rohit Grover 2:e060367b9024 97 ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */
Rohit Grover 2:e060367b9024 98 ble.startAdvertising();
yihui 0:e910d9bb040f 99
Rohit Grover 2:e060367b9024 100 ble.addService(uartService);
yihui 0:e910d9bb040f 101
Rohit Grover 2:e060367b9024 102 while (true) {
Rohit Grover 2:e060367b9024 103 ble.waitForEvent();
yihui 0:e910d9bb040f 104 }
yihui 0:e910d9bb040f 105 }