/* Copyright (c) 2014 Nordic Semiconductor. All Rights Reserved.

*

* The information contained herein is property of Nordic Semiconductor ASA.

* Terms and conditions of usage are described in detail in NORDIC

* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.

*

* Licensees are granted free, non-transferable use of the information. NO

* WARRANTY of ANY KIND is provided. This heading must NOT be removed from

* the file.

*

*/

/** @file

*

* @defgroup ble_sdk_uart_over_ble_main main.c

* @{

* @ingroup ble_sdk_app_nus_eval

* @brief UART over BLE application main file.

*

* This file contains the source code for a sample application that uses the Nordic UART service.

* This application uses the @ref srvlib_conn_params module.

*/

#include <stdint.h>

#include <string.h>

#include "nordic_common.h"

#include "nrf.h"

#include "ble_hci.h"

#include "ble_advdata.h"

#include "ble_advertising.h"

#include "ble_conn_params.h"

#include "softdevice_handler.h"

#include "app_timer.h"

#include "app_button.h"

#include "ble_nus.h"

#include "app_util_platform.h"

#include "bsp.h"

#include "bsp_btn_ble.h"

#include "nrf_delay.h"

#include "SEGGER_RTT.h"

#include "main.h"

#define IS_SRVC_CHANGED_CHARACT_PRESENT 0 /**< Include the service_changed characteristic. If not enabled, the server's database cannot be changed for the lifetime of the device. */

#if (NRF_SD_BLE_API_VERSION == 3)

#define NRF_BLE_MAX_MTU_SIZE GATT_MTU_SIZE_DEFAULT /**< MTU size used in the softdevice enabling and to reply to a BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST event. */

#endif

#define APP_FEATURE_NOT_SUPPORTED BLE_GATT_STATUS_ATTERR_APP_BEGIN + 2 /**< Reply when unsupported features are requested. */

#define CENTRAL_LINK_COUNT 0 /**< Number of central links used by the application. When changing this number remember to adjust the RAM settings*/

#define PERIPHERAL_LINK_COUNT 1 /**< Number of peripheral links used by the application. When changing this number remember to adjust the RAM settings*/

#define DEVICE_NAME "Connect Four" /**< Name of device. Will be included in the advertising data. */

#define NUS_SERVICE_UUID_TYPE BLE_UUID_TYPE_VENDOR_BEGIN /**< UUID type for the Nordic UART Service (vendor specific). */

#define APP_ADV_INTERVAL 64 /**< The advertising interval (in units of 0.625 ms. This value corresponds to 40 ms). */

#define APP_ADV_TIMEOUT_IN_SECONDS 180 /**< The advertising timeout (in units of seconds). */

#define APP_TIMER_PRESCALER 0 /**< Value of the RTC1 PRESCALER register. */

#define APP_TIMER_OP_QUEUE_SIZE 4 /**< Size of timer operation queues. */

#define MIN_CONN_INTERVAL MSEC_TO_UNITS(20, UNIT_1_25_MS) /**< Minimum acceptable connection interval (20 ms), Connection interval uses 1.25 ms units. */

#define MAX_CONN_INTERVAL MSEC_TO_UNITS(75, UNIT_1_25_MS) /**< Maximum acceptable connection interval (75 ms), Connection interval uses 1.25 ms units. */

#define SLAVE_LATENCY 0 /**< Slave latency. */

#define CONN_SUP_TIMEOUT MSEC_TO_UNITS(4000, UNIT_10_MS) /**< Connection supervisory timeout (4 seconds), Supervision Timeout uses 10 ms units. */

#define FIRST_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(5000, APP_TIMER_PRESCALER) /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */

#define NEXT_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(30000, APP_TIMER_PRESCALER) /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */

#define MAX_CONN_PARAMS_UPDATE_COUNT 3 /**< Number of attempts before giving up the connection parameter negotiation. */

static ble_nus_t m_nus; /**< Structure to identify the Nordic UART Service. */

static uint16_t m_conn_handle = BLE_CONN_HANDLE_INVALID; /**< Handle of the current connection. */

static ble_uuid_t m_adv_uuids[] = {{BLE_UUID_NUS_SERVICE, NUS_SERVICE_UUID_TYPE}}; /**< Universally unique service identifier. */

//Game State

uint8_t discs[WIDTH], game[HEIGHT][WIDTH];

//Player 1

uint8_t p1_disc_col;

uint8_t p1_home[WIDTH];

//connection state, player turn

uint8_t p1_turn, isConnected = 0;

//Used for timer interrupt

uint8_t curr_height = 0;

/**@brief Function for the GAP initialization.

*

* @details This function will set up all the necessary GAP (Generic Access Profile) parameters of

* the device. It also sets the permissions and appearance.

*/

static void gap_params_init(void)

{

uint32_t err_code;

ble_gap_conn_params_t gap_conn_params;

ble_gap_conn_sec_mode_t sec_mode;

BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);

err_code = sd_ble_gap_device_name_set(&sec_mode,

(const uint8_t *) DEVICE_NAME,

strlen(DEVICE_NAME));

APP_ERROR_CHECK(err_code);

memset(&gap_conn_params, 0, sizeof(gap_conn_params));

gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;

gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;

gap_conn_params.slave_latency = SLAVE_LATENCY;

gap_conn_params.conn_sup_timeout = CONN_SUP_TIMEOUT;

err_code = sd_ble_gap_ppcp_set(&gap_conn_params);

APP_ERROR_CHECK(err_code);

}

/**@brief Check if the game has been won.

Given the inserted disc location, check the entire row and column for four discs of the same color

Then check the diagonals by going left and up until it's not possible, then go down and right for left to right

and for right to left go down and right to the end then reverse.

*/

uint8_t checkWin(uint8_t row, uint8_t col) {

//Get the player color from the disc that was just dropped

uint8_t count = 0, r = 0, c = 0, player_color = game[row][col], curr_color;

for(; c < WIDTH; c++) { //check row

curr_color = game[row][c];

count = curr_color == player_color ? count + 1 : 0;

if(count == MOVES)

return true;

}

for(count = 0; r < HEIGHT; r++) { //check column

curr_color = game[r][col];

count = curr_color == player_color ? count + 1 : 0;

if(count == MOVES)

return true;

}

//Go to dropped disc and go down and left as much as possible, then check left-to-right diagonal

r = row;

c = col;

while(r != 0 && c != 0) {

r--;

c--;

}

for(count = 0; c < WIDTH && r < HEIGHT; c++) {

curr_color = game[r][c];

count = curr_color == player_color ? count + 1 : 0;

if(count == MOVES)

return true;

r++;

}

r = row; //Now go down and right as much as possible

c = col;

while(r > 0 && c < WIDTH - 1) {

r--;

c++;

}

for(count = 0; c >= 0 && r < HEIGHT; c--) {

curr_color = game[r][c];

count = curr_color == player_color ? count + 1 : 0;

if(count == MOVES)

return true;

r++;

}

return false;

}

/**@brief Update the game, given a location to place the disc

*/

void addToColumn(uint8_t col) {

uint8_t currColor = p1_turn ? RED : BLUE, row;

if(discs[col] < HEIGHT) {

//insert the disc

row = discs[col];

discs[col]++;

game[row][col] = currColor;

char temp_[24];

sprintf(temp_, "\nDisc added at %d, %d\n", col, row);

SEGGER_RTT_WriteString(0, temp_);

//Send data to Bluetooth connection

char temp[14];

uint8_t send[14];

sprintf(temp, "Received %d %d", col, row);

uint8_t i = 0;

while(temp[i] != '\0') { //Accounts for 1 or 2 digit numbers

send[i] = temp[i];

i++;

}

uint32_t err_code = ble_nus_string_send(&m_nus, send, i);

if(err_code != NRF_SUCCESS)

APP_ERROR_CHECK(err_code);

//check if game is over

if(checkWin(row, col)) {

switch(p1_turn) {

case true:

SEGGER_RTT_WriteString(0, "Player 1 Wins!\n");

break;

default:

SEGGER_RTT_WriteString(0, "Player 2 Wins!\n");

break;

}

}

p1_turn = !p1_turn;

} else

SEGGER_RTT_WriteString(0, "\nNo more moves may be made on this column\n");

}

/**@brief Function for handling the data from the Nordic UART Service.

*

* @details This function will process the data received from the Nordic UART BLE Service.

*

* @param[in] p_nus Nordic UART Service structure.

* @param[in] p_data Data to parse.

* @param[in] length Length of the data.

*/

/**@snippet [Handling the data received over BLE] */

static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)

{

//Copy uint8_t array to string array then use sscanf

char temp[length+1];

for(int i = 0; i < length; i++)

temp[i] = p_data[i];

temp[length] = '\0';

//Parse row number

unsigned int num;

sscanf(temp, "%u", &num);

SEGGER_RTT_printf(0, "\nPlayer 2 dropped disc at column %u\n", num);

//Check player status and input

if(p1_turn)

SEGGER_RTT_WriteString(0, "But it's not their turn yet!\n");

else if(num < 0 || num >= WIDTH)

SEGGER_RTT_WriteString(0, "That's not a valid column!\n");

else

addToColumn(num);

}

/**@snippet [Handling the data received over BLE] */

/**@brief Function for initializing services that will be used by the application.

*/

static void services_init(void)

{

uint32_t err_code;

ble_nus_init_t nus_init;

memset(&nus_init, 0, sizeof(nus_init));

nus_init.data_handler = nus_data_handler;

err_code = ble_nus_init(&m_nus, &nus_init);

APP_ERROR_CHECK(err_code);

}

/**@brief Function for handling an event from the Connection Parameters Module.

*

* @details This function will be called for all events in the Connection Parameters Module

* which are passed to the application.

*

* @note All this function does is to disconnect. This could have been done by simply setting

* the disconnect_on_fail config parameter, but instead we use the event handler

* mechanism to demonstrate its use.

*

* @param[in] p_evt Event received from the Connection Parameters Module.

*/

static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)

{

uint32_t err_code;

if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)

{

err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);

APP_ERROR_CHECK(err_code);

}

}

/**@brief Function for handling errors from the Connection Parameters module.

*

* @param[in] nrf_error Error code containing information about what went wrong.

*/

static void conn_params_error_handler(uint32_t nrf_error)

{

APP_ERROR_HANDLER(nrf_error);

}

/**@brief Function for initializing the Connection Parameters module.

*/

static void conn_params_init(void)

{

uint32_t err_code;

ble_conn_params_init_t cp_init;

memset(&cp_init, 0, sizeof(cp_init));

cp_init.p_conn_params = NULL;

cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;

cp_init.next_conn_params_update_delay = NEXT_CONN_PARAMS_UPDATE_DELAY;

cp_init.max_conn_params_update_count = MAX_CONN_PARAMS_UPDATE_COUNT;

cp_init.start_on_notify_cccd_handle = BLE_GATT_HANDLE_INVALID;

cp_init.disconnect_on_fail = false;

cp_init.evt_handler = on_conn_params_evt;

cp_init.error_handler = conn_params_error_handler;

err_code = ble_conn_params_init(&cp_init);

APP_ERROR_CHECK(err_code);

}

/**@brief Function for handling advertising events.

*

* @details This function will be called for advertising events which are passed to the application.

*

* @param[in] ble_adv_evt Advertising event.

*/

static void on_adv_evt(ble_adv_evt_t ble_adv_evt)

{

uint32_t err_code;

switch (ble_adv_evt)

{

case BLE_ADV_EVT_FAST:

err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);

APP_ERROR_CHECK(err_code);

break;

default:

break;

}

}

/**@brief Function for the application's SoftDevice event handler.

*

* @param[in] p_ble_evt SoftDevice event.

*/

static void on_ble_evt(ble_evt_t * p_ble_evt)

{

uint32_t err_code;

switch (p_ble_evt->header.evt_id)

{

case BLE_GAP_EVT_CONNECTED:

isConnected = true;

SEGGER_RTT_WriteString(0, "\nConnected to Bluetooth Device\n");

err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);

APP_ERROR_CHECK(err_code);

m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;

break; // BLE_GAP_EVT_CONNECTED

case BLE_GAP_EVT_DISCONNECTED:

isConnected = false;

SEGGER_RTT_WriteString(0, "\nDisconnected from Bluetooth Device\n");

err_code = bsp_indication_set(BSP_INDICATE_IDLE);

APP_ERROR_CHECK(err_code);

m_conn_handle = BLE_CONN_HANDLE_INVALID;

break; // BLE_GAP_EVT_DISCONNECTED

case BLE_GAP_EVT_SEC_PARAMS_REQUEST:

// Pairing not supported

err_code = sd_ble_gap_sec_params_reply(m_conn_handle, BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP, NULL, NULL);

APP_ERROR_CHECK(err_code);

break; // BLE_GAP_EVT_SEC_PARAMS_REQUEST

case BLE_GATTS_EVT_SYS_ATTR_MISSING:

// No system attributes have been stored.

err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0, 0);

APP_ERROR_CHECK(err_code);

break; // BLE_GATTS_EVT_SYS_ATTR_MISSING

case BLE_GATTC_EVT_TIMEOUT:

// Disconnect on GATT Client timeout event.

err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gattc_evt.conn_handle,

BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);

APP_ERROR_CHECK(err_code);

break; // BLE_GATTC_EVT_TIMEOUT

case BLE_GATTS_EVT_TIMEOUT:

// Disconnect on GATT Server timeout event.

err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle,

BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);

APP_ERROR_CHECK(err_code);

break; // BLE_GATTS_EVT_TIMEOUT

case BLE_EVT_USER_MEM_REQUEST:

err_code = sd_ble_user_mem_reply(p_ble_evt->evt.gattc_evt.conn_handle, NULL);

APP_ERROR_CHECK(err_code);

break; // BLE_EVT_USER_MEM_REQUEST

case BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST:

{

ble_gatts_evt_rw_authorize_request_t req;

ble_gatts_rw_authorize_reply_params_t auth_reply;

req = p_ble_evt->evt.gatts_evt.params.authorize_request;

if (req.type != BLE_GATTS_AUTHORIZE_TYPE_INVALID)

{

if ((req.request.write.op == BLE_GATTS_OP_PREP_WRITE_REQ) ||

(req.request.write.op == BLE_GATTS_OP_EXEC_WRITE_REQ_NOW) ||

(req.request.write.op == BLE_GATTS_OP_EXEC_WRITE_REQ_CANCEL))

{

if (req.type == BLE_GATTS_AUTHORIZE_TYPE_WRITE)

{

auth_reply.type = BLE_GATTS_AUTHORIZE_TYPE_WRITE;

}

else

{

auth_reply.type = BLE_GATTS_AUTHORIZE_TYPE_READ;

}

auth_reply.params.write.gatt_status = APP_FEATURE_NOT_SUPPORTED;

err_code = sd_ble_gatts_rw_authorize_reply(p_ble_evt->evt.gatts_evt.conn_handle,

&auth_reply);

APP_ERROR_CHECK(err_code);

}

}

} break; // BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST

#if (NRF_SD_BLE_API_VERSION == 3)

case BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST:

err_code = sd_ble_gatts_exchange_mtu_reply(p_ble_evt->evt.gatts_evt.conn_handle,

NRF_BLE_MAX_MTU_SIZE);

APP_ERROR_CHECK(err_code);

break; // BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST

#endif

default:

// No implementation needed.

break;

}

}

/**@brief Function for dispatching a SoftDevice event to all modules with a SoftDevice

* event handler.

*

* @details This function is called from the SoftDevice event interrupt handler after a

* SoftDevice event has been received.

*

* @param[in] p_ble_evt SoftDevice event.

*/

static void ble_evt_dispatch(ble_evt_t * p_ble_evt)

{

ble_conn_params_on_ble_evt(p_ble_evt);

ble_nus_on_ble_evt(&m_nus, p_ble_evt);

on_ble_evt(p_ble_evt);

ble_advertising_on_ble_evt(p_ble_evt);

bsp_btn_ble_on_ble_evt(p_ble_evt);

}

/**@brief Function for the SoftDevice initialization.

*

* @details This function initializes the SoftDevice and the BLE event interrupt.

*/

static void ble_stack_init(void)

{

uint32_t err_code;

nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;

// Initialize SoftDevice.

SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);

ble_enable_params_t ble_enable_params;

err_code = softdevice_enable_get_default_config(CENTRAL_LINK_COUNT,

PERIPHERAL_LINK_COUNT,

&ble_enable_params);

APP_ERROR_CHECK(err_code);

//Check the ram settings against the used number of links

CHECK_RAM_START_ADDR(CENTRAL_LINK_COUNT,PERIPHERAL_LINK_COUNT);

// Enable BLE stack.

#if (NRF_SD_BLE_API_VERSION == 3)

ble_enable_params.gatt_enable_params.att_mtu = NRF_BLE_MAX_MTU_SIZE;

#endif

err_code = softdevice_enable(&ble_enable_params);

APP_ERROR_CHECK(err_code);

// Subscribe for BLE events.

err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);

APP_ERROR_CHECK(err_code);

}

/**@brief Function for handling events from the BSP module.

*

* @param[in] event Event generated by button press.

*/

void bsp_event_handler(bsp_event_t event)

{

uint32_t err_code;

switch (event)

{

case BSP_EVENT_DISCONNECT:

err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);

if (err_code != NRF_ERROR_INVALID_STATE)

{

APP_ERROR_CHECK(err_code);

}

break;

case BSP_EVENT_WHITELIST_OFF:

if (m_conn_handle == BLE_CONN_HANDLE_INVALID)

{

err_code = ble_advertising_restart_without_whitelist();

if (err_code != NRF_ERROR_INVALID_STATE)

{

APP_ERROR_CHECK(err_code);

}

}

break;

default:

break;

}

}

/**@brief Function for initializing the Advertising functionality.

*/

static void advertising_init(void)

{

uint32_t err_code;

ble_advdata_t advdata;

ble_advdata_t scanrsp;

ble_adv_modes_config_t options;

// Build advertising data struct to pass into @ref ble_advertising_init.

memset(&advdata, 0, sizeof(advdata));

advdata.name_type = BLE_ADVDATA_FULL_NAME;

advdata.include_appearance = false;

advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

memset(&scanrsp, 0, sizeof(scanrsp));

scanrsp.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);

scanrsp.uuids_complete.p_uuids = m_adv_uuids;

memset(&options, 0, sizeof(options));

options.ble_adv_fast_enabled = true;

options.ble_adv_fast_interval = APP_ADV_INTERVAL;

options.ble_adv_fast_timeout = APP_ADV_TIMEOUT_IN_SECONDS;

err_code = ble_advertising_init(&advdata, &scanrsp, &options, on_adv_evt, NULL);

APP_ERROR_CHECK(err_code);

}

/**@brief Function for initializing buttons and leds.

*

* @param[out] p_erase_bonds Will be true if the clear bonding button was pressed to wake the application up.

*/

static void buttons_leds_init(bool * p_erase_bonds)

{

bsp_event_t startup_event;

uint32_t err_code = bsp_init(BSP_INIT_LED | BSP_INIT_BUTTONS,

APP_TIMER_TICKS(100, APP_TIMER_PRESCALER),

bsp_event_handler);

APP_ERROR_CHECK(err_code);

err_code = bsp_btn_ble_init(NULL, &startup_event);

APP_ERROR_CHECK(err_code);

*p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA);

}

/**@brief Function for placing the application in low power state while waiting for events.

*/

static void power_manage(void)

{

uint32_t err_code = sd_app_evt_wait();

APP_ERROR_CHECK(err_code);

}

/**@brief Writes to the ABC pins which indicate the row number (0-7)

*/

static void Row_Write(uint8_t row) {

//Get the row bits

uint8_t row1 = row & 1, row2 = row & (1 << 1), row3 = row & (1 << 2);

nrf_gpio_pin_write(A, row1);

nrf_gpio_pin_write(B, row2);

nrf_gpio_pin_write(C, row3);

}

/**@brief Writes to the Color 1 pins which indicate the LED color for the first 8 rows

*/

static void Color_Write(uint8_t rgb) {

uint8_t blue = rgb & 1, green = rgb & (1 << 1), red = rgb & (1 << 2);

nrf_gpio_pin_write(R1, red);

nrf_gpio_pin_write(G1, green);

nrf_gpio_pin_write(B1, blue);

}

/**@brief Writes to the Color 2 pins which indicate the LED color for the last 8 rows

*/

static void Color2_Write(uint8_t rgb) {

uint8_t blue = rgb & 1, green = rgb & (1 << 1), red = rgb & (1 << 2);

nrf_gpio_pin_write(R2, red);

nrf_gpio_pin_write(G2, green);

nrf_gpio_pin_write(B2, blue);

}

/**@brief Function for handling timer expiration events, used to update RGB LED Display. The display is bottom side up, LEDs are displayed from the top

Runs every millisecond, to refresh the display at a rate of 1kHz.

*/

static void timer_handler(void * p_context) {

nrf_gpio_pin_set(OE);

Row_Write(curr_height);

for(uint8_t i = 0; i < RBG_WIDTH; i++) { //assume start is zero

if(i < WIDTH) {

//Draw top half

if(curr_height < 8) {

if(curr_height == 0)

Color_Write(p1_home[i]); //draw current cursor position

else

Color_Write(game[curr_height - 1][i]); //i and row are switched, otherwise it'd draw horizontially

} else { //Draw bottom half

Color2_Write(game[curr_height - 1][i]);

}

} else { //Blank the rest out

Color_Write(0);

Color2_Write(0);

}

nrf_gpio_pin_set(CLK);

nrf_gpio_pin_clear(CLK);

}

nrf_gpio_pin_set(LAT);

nrf_delay_us(100); //Give enough time for latch to save

nrf_gpio_pin_clear(LAT);

nrf_gpio_pin_clear(OE);

curr_height = curr_height == HEIGHT ? 0 : curr_height + 1;

}

/**@brief Function for initializing the timer module and starting a timer with a handler that runs when it expires

*/

static void timer_init(void) {

APP_TIMER_DEF(timer_id); //Macro takes care of variable declaration

uint32_t err_code = app_timer_create(&timer_id, APP_TIMER_MODE_REPEATED, timer_handler);

APP_ERROR_CHECK(err_code);

err_code = app_timer_start(timer_id, APP_TIMER_TICKS(REFRESH_TIME, APP_TIMER_PRESCALER), NULL);

APP_ERROR_CHECK(err_code);

}

/**@brief Function for initializing the GPIO pins as outputs

*/

static void gpio_init(void) {

uint8_t gpios[12] = {R1, G1, B1, R2, G2, B2, A, B, C, LAT, CLK, OE};

for(uint8_t i = 0; i < 12; i++)

nrf_gpio_pin_dir_set(gpios[i], NRF_GPIO_PIN_DIR_OUTPUT);

}

/**@brief Function for initializing the game variables during startup or reset

*/

void game_init(void) {

memset(discs, 0, sizeof discs);

memset(p1_home, 0, sizeof p1_home);

p1_home[0] = RED;

memset(game, 0, sizeof(game[0][0]) * WIDTH * HEIGHT);

p1_disc_col = 0;

p1_turn = true;

//Print instructions

SEGGER_RTT_WriteString(0, "\nConnect Four BLE instructions:\n a - Move disc left\n d - Move disc right\n s - Insert disc\n h - back to first slot\n R or C - Reset game\n");

}

/**@brief Function for responding to keyboard input. SEGGER_RTT_GetKey does not block and will return a negative value if there is no input.

Checks if a bluetooth device is connected and if it is the player's turn before proceeding with the down key press.

*/

void moveDisc(int8_t whichInput) {

//Respond to keystroke

switch(whichInput) {

case LEFT:

if(p1_disc_col > 0) {

p1_home[p1_disc_col--] = 0;

p1_home[p1_disc_col] = RED;

}

break;

case RIGHT:

if(p1_disc_col < WIDTH-1) {

p1_home[p1_disc_col++] = 0;

p1_home[p1_disc_col] = RED;

}

break;

case HOME:

if(p1_disc_col != 0) {

p1_home[p1_disc_col] = 0;

p1_disc_col = 0;

p1_home[p1_disc_col] = RED;

}

break;

case DOWN: //Update discs then game array

if(!isConnected)

SEGGER_RTT_WriteString(0, "\nNot connected with another player yet!\n");

else if(!p1_turn)

SEGGER_RTT_WriteString(0, "\nUnable to place disc, not your turn yet!\n");

else

addToColumn(p1_disc_col);

break;

case RESET:

case CLEAR:

SEGGER_RTT_WriteString(0, "\nResetting game\n");

game_init();

break;

default:

;

}

}

//Detect Keystroke

int8_t getInput() {

int8_t curr_char = SEGGER_RTT_GetKey();

return curr_char;

}

/**@brief Application main function.

*/

int main(void)

{

uint32_t err_code;

bool erase_bonds;

// Initialize.

APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);

buttons_leds_init(&erase_bonds);

ble_stack_init();

gap_params_init();

services_init();

advertising_init();

conn_params_init();

gpio_init();

timer_init(); //timer task to refresh RGB LED Board

game_init();

err_code = ble_advertising_start(BLE_ADV_MODE_FAST);

APP_ERROR_CHECK(err_code);

// Enter main loop.

for (;;) {

power_manage();

moveDisc(getInput());

}

}

/**

* @}

*/