interrupt handling
Diff: main.cpp
- Revision:
- 0:5622c60e9d3a
- Child:
- 1:1eb96189824d
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Wed Feb 25 21:06:50 2015 +0000 @@ -0,0 +1,103 @@ +/* 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" +#include "HeartRateService.h" +#include "DeviceInformationService.h" + +/* Enable the following if you need to throttle the connection interval. This has + * the effect of reducing energy consumption after a connection is made; + * particularly for applications where the central may want a fast connection + * interval.*/ +#define UPDATE_PARAMS_FOR_LONGER_CONNECTION_INTERVAL 0 + +BLEDevice ble; +DigitalOut led1(LED1); +Serial pc(USBTX, USBRX); // tx, rx + +const static char DEVICE_NAME[] = "HRM1"; +static const uint16_t uuid16_list[] = {GattService::UUID_HEART_RATE_SERVICE, + GattService::UUID_DEVICE_INFORMATION_SERVICE}; +static volatile bool triggerSensorPolling = false; + +void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason) +{ + ble.startAdvertising(); // restart advertising +} + +void periodicCallback(void) +{ + led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */ + + /* Note that the periodicCallback() executes in interrupt context, so it is safer to do + * heavy-weight sensor polling from the main thread. */ + triggerSensorPolling = true; +} + +int main(void) +{ + pc.baud(115200); + for(int i = 0; i < 100; i ++) + { + printf("Hello Ron. Index is %d\r\n", i); + wait_ms(100); + } + led1 = 1; + Ticker ticker; + ticker.attach(periodicCallback, 1); // blink LED every second + + ble.init(); + ble.onDisconnection(disconnectionCallback); + + /* Setup primary service. */ + uint8_t hrmCounter = 100; // init HRM to 100bps + HeartRateService hrService(ble, hrmCounter, HeartRateService::LOCATION_FINGER); + + /* Setup auxiliary service. */ + DeviceInformationService deviceInfo(ble, "ARM", "Model1", "SN1", "hw-rev1", "fw-rev1", "soft-rev1"); + + /* Setup advertising. */ + ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE); + ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list)); + ble.accumulateAdvertisingPayload(GapAdvertisingData::GENERIC_HEART_RATE_SENSOR); + ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME)); + ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED); + ble.setAdvertisingInterval(Gap::MSEC_TO_ADVERTISEMENT_DURATION_UNITS(1000)); + ble.startAdvertising(); + + // infinite loop + while (1) { + // check for trigger from periodicCallback() + if (triggerSensorPolling && ble.getGapState().connected) { + triggerSensorPolling = false; + + // Do blocking calls or whatever is necessary for sensor polling. + // In our case, we simply update the HRM measurement. + hrmCounter++; + + // 100 <= HRM bps <=175 + if (hrmCounter == 175) { + hrmCounter = 100; + } + + // update bps + hrService.updateHeartRate(hrmCounter); + } else { + ble.waitForEvent(); // low power wait for event + } + } +}