HCSR04 Ultrasonic sensor exposed over BLE
Dependencies: BLE_API HCSR04 mbed nRF51822
Diff: main.cpp
- Revision:
- 0:470a1164da56
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Mon May 09 10:26:40 2016 +0000 @@ -0,0 +1,119 @@ +#include "mbed.h" +#include "ble/BLE.h" +#include "UltrasonicService.h" +#include "hcsr04.h" + +#define ULTRASONIC_UPDATE_INTERVAL 1.0f // in seconds + +#define LED_ON 0 +#define LED_OFF 1 + +static DigitalOut alivenessLED(LED1, LED_OFF); // green +static HCSR04 usensor(D0, D1); + +const static char DEVICE_NAME[] = "HPE_ULTRASONIC"; +static const uint16_t uuid16_list[] = { + UltrasonicService::SERVICE_UUID +}; + +static UltrasonicService *uServicePtr; + +static Ticker ledTicker; +static Ticker uTicker; +static Timeout cbTimeout; + +void readDistanceCallback(void) +{ + uint32_t dist = usensor.get_dist_cm(); + + uServicePtr->updateState(dist); + // should add a stop function? usensor.stop(); +} + + +void readDistance(void) +{ + usensor.start(); + + // need to like have it on for for 0.5s + cbTimeout.attach(&readDistanceCallback, 0.5f); +} + +void periodicCallback(void) +{ + alivenessLED = !alivenessLED; /* Do blinky on LED1 to indicate system aliveness. */ +} + +void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params) +{ + printf("Disconnected over BLE!\r\n"); + + BLE::Instance().gap().startAdvertising(); + + ledTicker.attach(periodicCallback, 1); + uTicker.detach(); +} + +void connectionCallback(const Gap::ConnectionCallbackParams_t * params) +{ + printf("Connected over BLE!\r\n"); + + // blink a bit faster when connected + ledTicker.attach(periodicCallback, 0.5); + + // only do ultrasonic readings whenever we're connected over BLE + uTicker.attach(readDistance, ULTRASONIC_UPDATE_INTERVAL); +} + +void onBleInitError(BLE &ble, ble_error_t error) +{ + // blink fast when we encountered an error + ledTicker.attach(periodicCallback, 0.2); +} +void bleInitComplete(BLE::InitializationCompleteCallbackContext *params) +{ + BLE& ble = params->ble; + ble_error_t error = params->error; + + if (error != BLE_ERROR_NONE) { + /* In case of error, forward the error handling to onBleInitError */ + onBleInitError(ble, error); + return; + } + + /* Ensure that it is the default instance of BLE */ + if(ble.getInstanceID() != BLE::DEFAULT_INSTANCE) { + return; + } + + ble.gap().onDisconnection(disconnectionCallback); + ble.gap().onConnection(connectionCallback); + + // Begin - If you add a new service, add it here! + uServicePtr = new UltrasonicService(ble); + // End - If you add a new service, add it here! + + ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE); + ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list)); + ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME)); + ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED); + ble.gap().setAdvertisingInterval(1000); + ble.gap().startAdvertising(); +} + +int main(void) +{ + // Blink the green LED! + ledTicker.attach(periodicCallback, 1); + + BLE &ble = BLE::Instance(); + ble.init(bleInitComplete); + + /* SpinWait for initialization to complete. This is necessary because the + * BLE object is used in the main loop below. */ + while (ble.hasInitialized() == false) { /* spin loop */ } + + while (true) { + ble.waitForEvent(); + } +}