
Simple example to demonstrate custom made BLE service and characteristics.
Fork of BLE_GATT_Example by
Revision 20:fcc752d401ec, committed 2015-10-20
- Comitter:
- andresag
- Date:
- Tue Oct 20 13:46:23 2015 +0000
- Parent:
- 19:477567297aac
- Parent:
- 18:7d89c4fba362
- Child:
- 21:73f42c00b1db
- Commit message:
- Merged updated version of main.cpp with upstream.
Changed in this revision
main.cpp | Show annotated file Show diff for this revision Revisions of this file |
main.cpp.orig | Show annotated file Show diff for this revision Revisions of this file |
--- a/main.cpp Tue Oct 20 13:41:38 2015 +0000 +++ b/main.cpp Tue Oct 20 13:46:23 2015 +0000 @@ -84,4 +84,4 @@ while (true) { ble.waitForEvent(); //Save power } -} +} \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp.orig Tue Oct 20 13:46:23 2015 +0000 @@ -0,0 +1,87 @@ +#include "mbed.h" +#include "ble/BLE.h" + +BLE ble; +DigitalOut led(LED1, 1); +uint16_t customServiceUUID = 0xA000; +uint16_t readCharUUID = 0xA001; +uint16_t writeCharUUID = 0xA002; + +const static char DEVICE_NAME[] = "ChangeMe!!"; // change this +static const uint16_t uuid16_list[] = {0xFFFF}; //Custom UUID, FFFF is reserved for development + +// Set Up custom Characteristics +static uint8_t readValue[10] = {0}; +ReadOnlyArrayGattCharacteristic<uint8_t, sizeof(readValue)> readChar(readCharUUID, readValue); + +static uint8_t writeValue[10] = {0}; +WriteOnlyArrayGattCharacteristic<uint8_t, sizeof(writeValue)> writeChar(writeCharUUID, writeValue); + +// Set up custom service +GattCharacteristic *characteristics[] = {&readChar, &writeChar}; +GattService customService(customServiceUUID, characteristics, sizeof(characteristics) / sizeof(GattCharacteristic *)); + + +/* + * Restart advertising when phone app disconnects +*/ +void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *) +{ + ble.gap().startAdvertising(); +} + +/* + * handle writes to writeCharacteristic +*/ +void writeCharCallback(const GattWriteCallbackParams *params) +{ + // check to see what characteristic was written, by handle + if(params->handle == writeChar.getValueHandle()) { + // toggle LED if only 1 byte is written + if(params->len == 1) { + led = params->data[0]; + (params->data[0] == 0x00) ? printf("led on\n\r") : printf("led off\n\r"); // print led toggle + } + // print the data if more than 1 byte is written + else { + printf("Data received: length = %d, data = 0x",params->len); + for(int x=0; x < params->len; x++) { + printf("%x", params->data[x]); + } + printf("\n\r"); + } + // update the readChar with the value of writeChar + ble.updateCharacteristicValue(readChar.getValueHandle(), params->data,params->len); + } +} + +/* + * main loop +*/ +int +main(void) +{ + /* initialize stuff */ + printf("\n\r********* Starting Main Loop *********\n\r"); + ble.init(); + ble.gap().onDisconnection(disconnectionCallback); + ble.gattServer().onDataWritten(writeCharCallback); + + /* setup advertising */ + ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE); // BLE only, no classic BT + ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED); // advertising type + ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME)); // add name + ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list)); // UUID's broadcast in advertising packet + ble.gap().setAdvertisingInterval(100); // 100ms. + + // add our custom service + ble.addService(customService); + + // start advertising + ble.gap().startAdvertising(); + + // infinite loop waiting for BLE interrupt events + while (true) { + ble.waitForEvent(); //Save power + } +}