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use UART Service to loopback anything received on the TX characteristic onto the RX.
Dependencies: BLE_API mbed nRF51822
Fork of BLE_LoopbackUART by
main.cpp
- Committer:
- dragosIQ
- Date:
- 2015-04-15
- Revision:
- 12:bf690d81b1ea
- Parent:
- 10:633cec718bf4
File content as of revision 12:bf690d81b1ea:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "mbed.h" #include "BLEDevice.h" #define BLE_UUID_TXRX_SERVICE 0x0000 /**< The UUID of the Nordic UART Service. */ #define BLE_UUID_TX_CHARACTERISTIC 0x0002 /**< The UUID of the TX Characteristic. */ #define BLE_UUIDS_RX_CHARACTERISTIC 0x0003 /**< The UUID of the RX Characteristic. */ #define TXRX_BUF_LEN 20 BLEDevice ble; DigitalOut led1(LED1); // The Nordic UART Service static const uint8_t uart_base_uuid[] = {0x71, 0x3D, 0, 0, 0x50, 0x3E, 0x4C, 0x75, 0xBA, 0x94, 0x31, 0x48, 0xF1, 0x8D, 0x94, 0x1E}; static const uint8_t uart_tx_uuid[] = {0x71, 0x3D, 0, 3, 0x50, 0x3E, 0x4C, 0x75, 0xBA, 0x94, 0x31, 0x48, 0xF1, 0x8D, 0x94, 0x1E}; static const uint8_t uart_rx_uuid[] = {0x71, 0x3D, 0, 2, 0x50, 0x3E, 0x4C, 0x75, 0xBA, 0x94, 0x31, 0x48, 0xF1, 0x8D, 0x94, 0x1E}; static const uint8_t uart_base_uuid_rev[] = {0x1E, 0x94, 0x8D, 0xF1, 0x48, 0x31, 0x94, 0xBA, 0x75, 0x4C, 0x3E, 0x50, 0, 0, 0x3D, 0x71}; uint8_t txPayload[TXRX_BUF_LEN] = {0,}; uint8_t rxPayload[TXRX_BUF_LEN] = {0,}; GattCharacteristic txCharacteristic (uart_tx_uuid, txPayload, 1, TXRX_BUF_LEN, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE_WITHOUT_RESPONSE); GattCharacteristic rxCharacteristic (uart_rx_uuid, rxPayload, 1, TXRX_BUF_LEN, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY); GattCharacteristic *uartChars[] = {&txCharacteristic, &rxCharacteristic}; GattService uartService(uart_base_uuid, uartChars, sizeof(uartChars) / sizeof(GattCharacteristic *)); void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason) { ble.startAdvertising(); } void onDataWritten(const GattCharacteristicWriteCBParams *Handler) { uint8_t buf[TXRX_BUF_LEN]; uint16_t bytesRead; if (Handler->charHandle == txCharacteristic.getValueAttribute().getHandle()) { ble.readCharacteristicValue(txCharacteristic.getValueAttribute().getHandle(), buf, &bytesRead); memset(txPayload, 0, TXRX_BUF_LEN); memcpy(txPayload, buf, TXRX_BUF_LEN); } } void switch_LED(void) { led1 = !led1; ble.updateCharacteristicValue(rxCharacteristic.getValueAttribute().getHandle(), (const uint8_t *)"Salam de Sibiu!\n", sizeof("Salam de Sibiu!\n")-1); } int main(void) { Ticker ticker; ticker.attach_us(switch_LED, 2000000); ble.init(); ble.onDisconnection(disconnectionCallback); ble.onDataWritten(onDataWritten); // setup advertising ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED); ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED); ble.accumulateAdvertisingPayload(GapAdvertisingData::SHORTENED_LOCAL_NAME, (const uint8_t *)"sBeacon", sizeof("sBeacon") - 1); ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_128BIT_SERVICE_IDS, (const uint8_t *)uart_base_uuid_rev, sizeof(uart_base_uuid)); // 100ms; in multiples of 0.625ms. ble.setAdvertisingInterval(Gap::MSEC_TO_ADVERTISEMENT_DURATION_UNITS(1000)); ble.addService(uartService); ble.startAdvertising(); led1 = 1; while (true) { ble.waitForEvent(); } }