Test using the base BLE_HeartRate example to see the effect of increasing the "ticker" rate on stability (intending to do AnalogIn around 1ms rate)
Dependencies: BLE_API mbed nRF51822
Diff: main.cpp
- Revision:
- 0:ec36dec086bb
- Child:
- 1:259fe4d2ab16
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Mon Sep 29 10:33:30 2014 +0000 @@ -0,0 +1,101 @@ +/* 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 "BatteryService.h" +#include "DeviceInformationService.h" + +BLEDevice ble; +DigitalOut led1(LED1); +DigitalOut indicatorLed2(LED2); + +#define NEED_CONSOLE_OUTPUT 0 /* Set this if you need debug messages on the console; + * it will have an impact on code-size and power consumption. */ + +#if NEED_CONSOLE_OUTPUT +Serial pc(USBTX, USBRX); +#define DEBUG(...) { pc.printf(__VA_ARGS__); } +#else +#define DEBUG(...) /* nothing */ +#endif /* #if NEED_CONSOLE_OUTPUT */ + +const static char DEVICE_NAME[] = "HRMonitor"; +static const uint16_t uuid16_list[] = {GattService::UUID_HEART_RATE_SERVICE, + GattService::UUID_BATTERY_SERVICE, + GattService::UUID_DEVICE_INFORMATION_SERVICE}; +static volatile bool triggerSensorPolling = false; + +void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason) +{ + DEBUG("Disconnected handle %u!\n\r", handle); + DEBUG("Restarting the advertising process\n\r"); + ble.startAdvertising(); +} + +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) +{ + led1 = 1; + indicatorLed2 = 1; + Ticker ticker; + ticker.attach(periodicCallback, 1); + + DEBUG("Initialising the nRF51822\n\r"); + ble.init(); + ble.onDisconnection(disconnectionCallback); + + /* 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(1600); /* 1000ms; in multiples of 0.625ms. */ + ble.startAdvertising(); + + uint8_t hrmCounter = 100; + HeartRateService hrService(ble, hrmCounter, HeartRateService::LOCATION_FINGER); + BatteryService battery(ble); + DeviceInformationService deviceInfo(ble, "ARM", "Model1", "SN1", "hw-rev1", "fw-rev1", "soft-rev1"); + + while (true) { + if (triggerSensorPolling) { + triggerSensorPolling = false; + + /* Do blocking calls or whatever is necessary for sensor polling. */ + /* In our case, we simply update the dummy HRM measurement. */ + hrmCounter++; + if (hrmCounter == 175) { + hrmCounter = 100; + } + + indicatorLed2 = !indicatorLed2; + hrService.updateHeartRate(hrmCounter); + } else { + ble.waitForEvent(); + } + } +}