Yihui Xiong / Mbed 2 deprecated BLE_Micro_UART

BLE to UART

Dependencies:   BLE_API Buffer mbed nRF51822

Fork of BLE_LoopbackUART by Bluetooth Low Energy

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 }