File content as of revision 3:266dfa9f8709:

/* mbed Microcontroller Library
 * Copyright (c) 2015 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 "BLE.h"
#include "KeyboardService.h"
#include "BatteryService.h"
#include "DeviceInformationService.h"

static const char MODEL_NAME[] = "keyboard";
static const char SERIAL_NUMBER[] = "X00000";
static const char HARDWARE_REVISION[] = "0.1";
static const char FIRMWARE_REVISION[] = "0.1";
static const char SOFTWARE_REVISION[] = "0.0";

static const uint8_t DEVICE_NAME[] = "my keyboard";
static const uint8_t SHORT_DEVICE_NAME[] = "kbd1";

static const bool ENABLE_BONDING = true;
static const bool REQUIRE_MITM = true;
static const uint8_t PASSKEY[6] = {'1','2','3','4','5','6'}; // must be 6-digits number

InterruptIn button1(D2);

static const uint16_t uuid16_list[] =  {
	GattService::UUID_HUMAN_INTERFACE_DEVICE_SERVICE,
	GattService::UUID_DEVICE_INFORMATION_SERVICE,
	GattService::UUID_BATTERY_SERVICE
};

KeyboardService* keyboardService;
BatteryService* batteryService;
DeviceInformationService* deviceInformationService;

// I2C i2c(D2, D3);
AnalogIn batteryInput(A4);

void updateBatteryLevel() {
	if (!batteryService) return;
	static const float BATTERY_MAX = 2.4;

	float batteryVoltage = batteryInput.read() * 1.2 * 3;
	float percentage = (batteryVoltage / BATTERY_MAX) * 100;
	if (percentage > 100) {
		percentage = 100;
	}
	printf("updateBatteryLevel %d\r\n",static_cast<uint8_t>(percentage));
	batteryService->updateBatteryLevel(static_cast<uint8_t>(percentage));
}


static void onConnect(const Gap::ConnectionCallbackParams_t *params) {
	printf("onConnect\r\n");
}

static void onDisconnect(const Gap::DisconnectionCallbackParams_t *params) {
	printf("onDisconnect\r\n");
	BLE::Instance(BLE::DEFAULT_INSTANCE).gap().startAdvertising();
}

static void onTimeout(const Gap::TimeoutSource_t source) {
	printf("onTimeout\r\n");
	BLE::Instance(BLE::DEFAULT_INSTANCE).gap().startAdvertising();
}

static void passkeyDisplayCallback(Gap::Handle_t handle, const SecurityManager::Passkey_t passkey) {
	printf("Input passKey: ");
	for (unsigned i = 0; i < Gap::ADDR_LEN; i++) {
		printf("%c", passkey[i]);
	}
	printf("\r\n");
}

static void securitySetupCompletedCallback(Gap::Handle_t handle, SecurityManager::SecurityCompletionStatus_t status) {
	if (status == SecurityManager::SEC_STATUS_SUCCESS) {
		printf("Security success %d\r\n", status);
	} else {
		printf("Security failed %d\r\n", status);
	}
}

static void securitySetupInitiatedCallback(Gap::Handle_t, bool allowBonding, bool requireMITM, SecurityManager::SecurityIOCapabilities_t iocaps) {
	printf("Security setup initiated\r\n");
}

static void bleInitComplete(BLE::InitializationCompleteCallbackContext *params) {
	// https://developer.mbed.org/compiler/#nav:/keyboard/BLE_API/ble/blecommon.h;
	ble_error_t error;
	BLE &ble          = params->ble;
	
	error = params->error;
	if (error != BLE_ERROR_NONE) {
		printf("error on ble.init() \r\n");
		goto return_error;
	}

	ble.gap().onDisconnection(onDisconnect);
	ble.gap().onConnection(onConnect);
	ble.gap().onTimeout(onTimeout);

	printf("setup ble security manager\r\n");
	ble.securityManager().onSecuritySetupInitiated(securitySetupInitiatedCallback);
	ble.securityManager().onPasskeyDisplay(passkeyDisplayCallback);
	ble.securityManager().onSecuritySetupCompleted(securitySetupCompletedCallback);
	// bonding with hard-coded passkey.
	error = ble.securityManager().init(ENABLE_BONDING, REQUIRE_MITM, SecurityManager::IO_CAPS_DISPLAY_ONLY, PASSKEY);
	if (error != BLE_ERROR_NONE) {
		printf("error on ble.securityManager().init()");
		goto return_error;
	}

	keyboardService = new KeyboardService(ble);
	deviceInformationService = new DeviceInformationService(ble, "lowreal.net", MODEL_NAME, SERIAL_NUMBER, HARDWARE_REVISION, FIRMWARE_REVISION, SOFTWARE_REVISION);
	batteryService = new BatteryService(ble, 100);
	updateBatteryLevel();

	printf("general setup\r\n");
	error = ble.gap().accumulateAdvertisingPayload(
		GapAdvertisingData::BREDR_NOT_SUPPORTED |
		GapAdvertisingData::LE_GENERAL_DISCOVERABLE
	);
	if (error != BLE_ERROR_NONE) goto return_error;

	printf("set COMPLETE_LIST_16BIT_SERVICE_IDS\r\n");
	error = ble.gap().accumulateAdvertisingPayload(
		GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS,
		(uint8_t*)uuid16_list, sizeof(uuid16_list)
	);
	if (error != BLE_ERROR_NONE) goto return_error;

	printf("set advertising\r\n");
	// see 5.1.2: HID over GATT Specification (pg. 25)
	ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);

	printf("set advertising interval\r\n");
	ble.gap().setAdvertisingInterval(50);
	// XXX
	// ble.gap().setAdvertisingTimeout(0);

	printf("set keyboard\r\n");
	error = ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::KEYBOARD);
	if (error != BLE_ERROR_NONE) goto return_error;

	printf("set complete local name\r\n");
	error = ble.gap().accumulateAdvertisingPayload(
		GapAdvertisingData::COMPLETE_LOCAL_NAME,
		DEVICE_NAME, sizeof(DEVICE_NAME)
	);
	if (error != BLE_ERROR_NONE) goto return_error;

	printf("set device name\r\n");
	error = ble.gap().setDeviceName(DEVICE_NAME);
	if (error != BLE_ERROR_NONE) goto return_error;
	// ble.gap().setTxPower(-12);


	printf("advertising\r\n");
	error = ble.gap().startAdvertising();
	if (error != BLE_ERROR_NONE) goto return_error;
	return;

return_error:
	printf("error with %d\r\n", error);
	return;
}

void send_string(const char * c) {
	if (!keyboardService) return;

	if (!keyboardService->isConnected()) {
		printf("we haven't connected yet...");
	} else {
		int len = strlen(c);
		keyboardService->printf(c);
		printf("sending %d chars\r\n", len);
	}
}

void send_stuff() {
	send_string("hello world!\n");
}

int main(void) {
	// Use internal 1.2V reference for batteryInput
	//	1/3 pre-scaled input and 1.2V internal band gap reference
	//	(mbed uses vdd for reference but i want use band gap)
	// ref. mbed-src/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/analogin_api.c
	NRF_ADC->CONFIG =
		(ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos) |
		(ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos) |
		(ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos) |
		(ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos);

	// https://github.com/jpbrucker/BLE_HID/blob/master/examples/examples_common.cpp

	printf("ble.init\r\n");
	BLE& ble = BLE::Instance(BLE::DEFAULT_INSTANCE);
	ble.init(bleInitComplete);

	button1.rise(send_stuff);

	while (!ble.hasInitialized()) { }

	printf("ble.hasIntialized\r\n");

	while (1) {
		ble.waitForEvent();
	}
}