How to configure a himax camera HX6538 to nRF52840 controller?

I am trying to configure himax camera and stream to app but unable to get image, rather when I am using nrf app to see data i am getting data something like this:

'40-13', '81-4B', 'C2-80', 'C0-5A', '89-C0-5A', '80-0B', '01-C1', 'BD-40-1A', 'C0-27', '2D-83-C1', '4F-C2-85', '63-C2-80', '5A-01-C1', 'C0-48', '80-40-1A', '5A-03-C1', '5A-02-D0', '18-40-13', '40-5A', 'C2-81'. I am attaching the code with i am using to send data and attached and ble_image_transfer_service.c file. Kindly help me in that.

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 * 
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 */
#include <stdio.h>
#include "sdk_common.h"
#if NRF_MODULE_ENABLED(BLE_NUS)
#include "ble_image_transfer_service.h"
#include "ble_srv_common.h"
#include "ble.h"
#include "nrf_gpio.h"

#define BLE_UUID_ITS_TX_CHARACTERISTIC 0x0003                      /**< The UUID of the TX Characteristic. */
#define BLE_UUID_ITS_RX_CHARACTERISTIC 0x0002                      /**< The UUID of the RX Characteristic. */
#define BLE_UUID_ITS_IMG_INFO_CHARACTERISTIC 0x0004

#define BLE_ITS_MAX_RX_CHAR_LEN        BLE_ITS_MAX_DATA_LEN        /**< Maximum length of the RX Characteristic (in bytes). */
#define BLE_ITS_MAX_TX_CHAR_LEN        BLE_ITS_MAX_DATA_LEN        /**< Maximum length of the TX Characteristic (in bytes). */

#define ITS_BASE_UUID                  {{0x3E, 0xCA, 0xDC, 0x24, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x00, 0x00, 0x40, 0x6E}} /**< Used vendor specific UUID. */

#include "nrf_log.h"

volatile uint32_t file_size = 0, file_pos = 0, m_max_data_length = 20;
uint8_t * file_data;
ble_its_t * m_its;

#define ITS_ENABLE_PIN_DEBUGGING 0

#if(ITS_ENABLE_PIN_DEBUGGING == 1)
#define ITS_DEBUG_PIN_SET(_pin) nrf_gpio_pin_set(DBG_PIN_ ## _pin)
#define ITS_DEBUG_PIN_CLR(_pin) nrf_gpio_pin_clear(DBG_PIN_ ## _pin)
#else
#define ITS_DEBUG_PIN_SET(_pin) 
#define ITS_DEBUG_PIN_CLR(_pin) 
#endif

static void its_enable_gpio_debug(void)
{
#if(ITS_ENABLE_PIN_DEBUGGING == 1)
    nrf_gpio_cfg_output(DBG_PIN_0);
    nrf_gpio_cfg_output(DBG_PIN_1);
    nrf_gpio_cfg_output(DBG_PIN_2);
    
    // Configure two GPIO's to signal TX and RX activity on the radio, for debugging throughput issues on different phones
    NRF_GPIOTE->CONFIG[0] = GPIOTE_CONFIG_MODE_Task << GPIOTE_CONFIG_MODE_Pos |
                            GPIOTE_CONFIG_POLARITY_Toggle << GPIOTE_CONFIG_POLARITY_Pos | 
                            DBG_PIN_3 << GPIOTE_CONFIG_PSEL_Pos;
    NRF_GPIOTE->CONFIG[1] = GPIOTE_CONFIG_MODE_Task << GPIOTE_CONFIG_MODE_Pos |
                            GPIOTE_CONFIG_POLARITY_Toggle << GPIOTE_CONFIG_POLARITY_Pos | 
                            DBG_PIN_4 << GPIOTE_CONFIG_PSEL_Pos;
    
    NRF_PPI->CH[0].EEP = (uint32_t)&NRF_RADIO->EVENTS_TXREADY;
    NRF_PPI->CH[0].TEP = (uint32_t)&NRF_GPIOTE->TASKS_SET[0];
    
    NRF_PPI->CH[1].EEP = (uint32_t)&NRF_RADIO->EVENTS_RXREADY;
    NRF_PPI->CH[1].TEP = (uint32_t)&NRF_GPIOTE->TASKS_SET[1];
    
    NRF_PPI->CH[2].EEP = (uint32_t)&NRF_RADIO->EVENTS_DISABLED;
    NRF_PPI->CH[2].TEP = (uint32_t)&NRF_GPIOTE->TASKS_CLR[0];
    NRF_PPI->FORK[2].TEP = (uint32_t)&NRF_GPIOTE->TASKS_CLR[1];
    
    NRF_PPI->CHENSET = 0x07;
#endif
}


/**@brief Function for handling the @ref BLE_GAP_EVT_CONNECTED event from the S110 SoftDevice.
 *
 * @param[in] p_its     Nordic UART Service structure.
 * @param[in] p_ble_evt Pointer to the event received from BLE stack.
 */
static void on_connect(ble_its_t * p_its, ble_evt_t const * p_ble_evt)
{
    p_its->conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
}


/**@brief Function for handling the @ref BLE_GAP_EVT_DISCONNECTED event from the S110 SoftDevice.
 *
 * @param[in] p_its     Nordic UART Service structure.
 * @param[in] p_ble_evt Pointer to the event received from BLE stack.
 */
static void on_disconnect(ble_its_t * p_its, ble_evt_t const * p_ble_evt)
{
    UNUSED_PARAMETER(p_ble_evt);
    p_its->conn_handle = BLE_CONN_HANDLE_INVALID;
}


/**@brief Function for handling the @ref BLE_GATTS_EVT_WRITE event from the S110 SoftDevice.
 *
 * @param[in] p_its     Nordic UART Service structure.
 * @param[in] p_ble_evt Pointer to the event received from BLE stack.
 */
static void on_write(ble_its_t * p_its, ble_evt_t const * p_ble_evt)
{
    ble_gatts_evt_write_t const * p_evt_write = &p_ble_evt->evt.gatts_evt.params.write;

    if (
        (p_evt_write->handle == p_its->tx_handles.cccd_handle)
        &&
        (p_evt_write->len == 2)
       )
    {
        if (ble_srv_is_notification_enabled(p_evt_write->data))
        {
            p_its->is_notification_enabled = true;
        }
        else
        {
            p_its->is_notification_enabled = false;
        }
    }
    else if (
        (p_evt_write->handle == p_its->img_info_handles.cccd_handle)
        &&
        (p_evt_write->len == 2)
       )
    {
        if (ble_srv_is_notification_enabled(p_evt_write->data))
        {
            p_its->is_info_char_notification_enabled = true;
        }
        else
        {
            p_its->is_info_char_notification_enabled = false;
        }
    }
    else if (
             (p_evt_write->handle == p_its->rx_handles.value_handle)
             &&
             (p_its->data_handler != NULL)
            )
    {
        p_its->data_handler(p_its, p_evt_write->data, p_evt_write->len);
    }
    else
    {
        // Do Nothing. This event is not relevant for this service.
    }
}


/**@brief Function for adding TX characteristic.
 *
 * @param[in] p_its       Nordic UART Service structure.
 * @param[in] p_its_init  Information needed to initialize the service.
 *
 * @return NRF_SUCCESS on success, otherwise an error code.
 */
static uint32_t tx_char_add(ble_its_t * p_its, const ble_its_init_t * p_its_init)
{
    /**@snippet [Adding proprietary characteristic to S110 SoftDevice] */
    ble_gatts_char_md_t char_md;
    ble_gatts_attr_md_t cccd_md;
    ble_gatts_attr_t    attr_char_value;
    ble_uuid_t          ble_uuid;
    ble_gatts_attr_md_t attr_md;

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

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.write_perm);

    cccd_md.vloc = BLE_GATTS_VLOC_STACK;

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

    char_md.char_props.notify = 1;
    char_md.p_char_user_desc  = NULL;
    char_md.p_char_pf         = NULL;
    char_md.p_user_desc_md    = NULL;
    char_md.p_cccd_md         = &cccd_md;
    char_md.p_sccd_md         = NULL;

    ble_uuid.type = p_its->uuid_type;
    ble_uuid.uuid = BLE_UUID_ITS_TX_CHARACTERISTIC;

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

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);

    attr_md.vloc    = BLE_GATTS_VLOC_STACK;
    attr_md.rd_auth = 0;
    attr_md.wr_auth = 0;
    attr_md.vlen    = 1;

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

    attr_char_value.p_uuid    = &ble_uuid;
    attr_char_value.p_attr_md = &attr_md;
    attr_char_value.init_len  = sizeof(uint8_t);
    attr_char_value.init_offs = 0;
    attr_char_value.max_len   = BLE_ITS_MAX_TX_CHAR_LEN;

    return sd_ble_gatts_characteristic_add(p_its->service_handle,
                                           &char_md,
                                           &attr_char_value,
                                           &p_its->tx_handles);
    /**@snippet [Adding proprietary characteristic to S110 SoftDevice] */
}

/**@brief Function for adding TX characteristic.
 *
 * @param[in] p_its       Nordic UART Service structure.
 * @param[in] p_its_init  Information needed to initialize the service.
 *
 * @return NRF_SUCCESS on success, otherwise an error code.
 */
static uint32_t img_info_char_add(ble_its_t * p_its, const ble_its_init_t * p_its_init)
{
    /**@snippet [Adding proprietary characteristic to S110 SoftDevice] */
    ble_gatts_char_md_t char_md;
    ble_gatts_attr_md_t cccd_md;
    ble_gatts_attr_t    attr_char_value;
    ble_uuid_t          ble_uuid;
    ble_gatts_attr_md_t attr_md;

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

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.write_perm);

    cccd_md.vloc = BLE_GATTS_VLOC_STACK;

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

    char_md.char_props.notify = 1;
    char_md.p_char_user_desc  = NULL;
    char_md.p_char_pf         = NULL;
    char_md.p_user_desc_md    = NULL;
    char_md.p_cccd_md         = &cccd_md;
    char_md.p_sccd_md         = NULL;

    ble_uuid.type = p_its->uuid_type;
    ble_uuid.uuid = BLE_UUID_ITS_IMG_INFO_CHARACTERISTIC;

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

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);

    attr_md.vloc    = BLE_GATTS_VLOC_STACK;
    attr_md.rd_auth = 0;
    attr_md.wr_auth = 0;
    attr_md.vlen    = 1;

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

    attr_char_value.p_uuid    = &ble_uuid;
    attr_char_value.p_attr_md = &attr_md;
    attr_char_value.init_len  = 1 + sizeof(ble_its_img_info_t);
    attr_char_value.init_offs = 0;
    attr_char_value.max_len   = 16;

    return sd_ble_gatts_characteristic_add(p_its->service_handle,
                                           &char_md,
                                           &attr_char_value,
                                           &p_its->img_info_handles);
    /**@snippet [Adding proprietary characteristic to S110 SoftDevice] */
}


/**@brief Function for adding RX characteristic.
 *
 * @param[in] p_its       Nordic UART Service structure.
 * @param[in] p_its_init  Information needed to initialize the service.
 *
 * @return NRF_SUCCESS on success, otherwise an error code.
 */
static uint32_t rx_char_add(ble_its_t * p_its, const ble_its_init_t * p_its_init)
{
    ble_gatts_char_md_t char_md;
    ble_gatts_attr_t    attr_char_value;
    ble_uuid_t          ble_uuid;
    ble_gatts_attr_md_t attr_md;

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

    char_md.char_props.write         = 1;
    char_md.char_props.write_wo_resp = 1;
    char_md.p_char_user_desc         = NULL;
    char_md.p_char_pf                = NULL;
    char_md.p_user_desc_md           = NULL;
    char_md.p_cccd_md                = NULL;
    char_md.p_sccd_md                = NULL;

    ble_uuid.type = p_its->uuid_type;
    ble_uuid.uuid = BLE_UUID_ITS_RX_CHARACTERISTIC;

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

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);

    attr_md.vloc    = BLE_GATTS_VLOC_STACK;
    attr_md.rd_auth = 0;
    attr_md.wr_auth = 0;
    attr_md.vlen    = 1;

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

    attr_char_value.p_uuid    = &ble_uuid;
    attr_char_value.p_attr_md = &attr_md;
    attr_char_value.init_len  = 1;
    attr_char_value.init_offs = 0;
    attr_char_value.max_len   = BLE_ITS_MAX_RX_CHAR_LEN;

    return sd_ble_gatts_characteristic_add(p_its->service_handle,
                                           &char_md,
                                           &attr_char_value,
                                           &p_its->rx_handles);
}


static uint32_t push_data_packets()
{
    uint32_t return_code = NRF_SUCCESS;
    uint32_t packet_length = m_max_data_length;
    uint32_t packet_size = 0;
    
    uint32_t temp_file_size = file_size;  // Read volatile variable into a non-volatile temporary
    uint32_t temp_file_pos = file_pos;    // Read volatile variable into a non-volatile temporary
    uint32_t remaining_size = temp_file_size - temp_file_pos;  // Perform the arithmetic on non-volatile variables

    ITS_DEBUG_PIN_SET(1);
     while(return_code == NRF_SUCCESS)
    {   
    //uint32_t remaining_size = file_size - file_pos;  // Break down volatile access
    if (remaining_size > packet_length) {
        packet_size = packet_length;
    } else if (remaining_size > 0) {
        packet_size = remaining_size;
    }
//
//        if((file_size - file_pos) > packet_length)
//        {
//            packet_size = packet_length;
//        }
//        else if((file_size - file_pos) > 0)
//        {
//            packet_size = file_size - file_pos;
//        }
        
        if(packet_size > 0)
        {
            return_code = ble_its_string_send(m_its, &file_data[file_pos], packet_size);
            if(return_code == NRF_SUCCESS)
            {
                file_pos += packet_size;
            }   
        }
        else
        {
            file_size = 0;
            break;
        }
    }
    ITS_DEBUG_PIN_CLR(1);
    return return_code;
}

static volatile bool nrf_error_resources = false;

void ble_its_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
{
    if ((p_context == NULL) || (p_ble_evt == NULL))
    {
        return;
    }
    
    ble_its_t * p_its = (ble_its_t*)p_context;
    
    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            on_connect(p_its, p_ble_evt);
            break;

        case BLE_GAP_EVT_DISCONNECTED:
            on_disconnect(p_its, p_ble_evt);
            break;

        case BLE_GATTS_EVT_WRITE:
            on_write(p_its, p_ble_evt);
            break;

        case BLE_GATTS_EVT_HVN_TX_COMPLETE:
            {
                //uint32_t count = p_ble_evt->evt.gatts_evt.params.hvn_tx_complete.count;
                ITS_DEBUG_PIN_SET(2);
                ITS_DEBUG_PIN_CLR(1);
                if(file_size > 0)
                {
                    push_data_packets();
                }
                ITS_DEBUG_PIN_CLR(2);
                nrf_error_resources = false;
            }
            break;
            
        default:
            // No implementation needed.
            break;
    }
}


uint32_t ble_its_init(ble_its_t * p_its, const ble_its_init_t * p_its_init)
{
    uint32_t      err_code;
    ble_uuid_t    ble_uuid;
    ble_uuid128_t its_base_uuid = ITS_BASE_UUID;

    VERIFY_PARAM_NOT_NULL(p_its);
    VERIFY_PARAM_NOT_NULL(p_its_init);

    // Initialize the service structure.
    p_its->conn_handle             = BLE_CONN_HANDLE_INVALID;
    p_its->data_handler            = p_its_init->data_handler;
    p_its->is_notification_enabled = false;

    /**@snippet [Adding proprietary Service to S110 SoftDevice] */
    // Add a custom base UUID.
    err_code = sd_ble_uuid_vs_add(&its_base_uuid, &p_its->uuid_type);
    VERIFY_SUCCESS(err_code);

    ble_uuid.type = p_its->uuid_type;
    ble_uuid.uuid = BLE_UUID_ITS_SERVICE;

    // Add the service.
    err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY,
                                        &ble_uuid,
                                        &p_its->service_handle);
    /**@snippet [Adding proprietary Service to S110 SoftDevice] */
    VERIFY_SUCCESS(err_code);

    // Add the RX Characteristic.
    err_code = rx_char_add(p_its, p_its_init);
    VERIFY_SUCCESS(err_code);

    // Add the TX Characteristic.
    err_code = tx_char_add(p_its, p_its_init);
    VERIFY_SUCCESS(err_code);
    
    // Add the Image Info Characteristic.
    err_code = img_info_char_add(p_its, p_its_init);
    VERIFY_SUCCESS(err_code);

    its_enable_gpio_debug();
    return NRF_SUCCESS;
}


uint32_t ble_its_string_send(ble_its_t * p_its, uint8_t * p_string, uint16_t length)
{
    ble_gatts_hvx_params_t hvx_params;
    uint32_t err_code;
    ITS_DEBUG_PIN_SET(0);

    if(nrf_error_resources)
    {
        ITS_DEBUG_PIN_CLR(0);
        return NRF_ERROR_RESOURCES;
    }

    VERIFY_PARAM_NOT_NULL(p_its);

    if ((p_its->conn_handle == BLE_CONN_HANDLE_INVALID) || (!p_its->is_notification_enabled))
    {
        return NRF_ERROR_INVALID_STATE;
    }

    if (length > BLE_ITS_MAX_DATA_LEN)
    {
        return NRF_ERROR_INVALID_PARAM;
    }

    memset(&hvx_params, 0, sizeof(hvx_params));
    hvx_params.handle = p_its->tx_handles.value_handle;
    hvx_params.p_data = p_string;
    hvx_params.p_len  = &length;
    hvx_params.type   = BLE_GATT_HVX_NOTIFICATION;
    
    err_code = sd_ble_gatts_hvx(p_its->conn_handle, &hvx_params);

    if(err_code == NRF_ERROR_RESOURCES)
    {
        nrf_error_resources = true;
        ITS_DEBUG_PIN_SET(1);
    }
    ITS_DEBUG_PIN_CLR(0);
    //NRF_LOG_INFO("NOT - Len: %i, err_code: %i", length, err_code);
    return err_code;
}

uint32_t ble_its_ble_params_info_send(ble_its_t * p_its, ble_its_ble_params_info_t * ble_params_info)
{
    uint8_t data_buf[1 + sizeof(ble_its_ble_params_info_t)];
    ble_gatts_hvx_params_t hvx_params;

    VERIFY_PARAM_NOT_NULL(p_its);

    if ((p_its->conn_handle == BLE_CONN_HANDLE_INVALID) || (!p_its->is_info_char_notification_enabled))
    {
        return NRF_ERROR_INVALID_STATE;
    }

    uint16_t length = 1 + sizeof(ble_its_ble_params_info_t);

    data_buf[0] = 2;
    memcpy(&data_buf[1], ble_params_info, sizeof(ble_its_ble_params_info_t));
    
    memset(&hvx_params, 0, sizeof(hvx_params));
    
    hvx_params.handle = p_its->img_info_handles.value_handle;
    hvx_params.p_data = data_buf;
    hvx_params.p_len  = &length;
    hvx_params.type   = BLE_GATT_HVX_NOTIFICATION;

    return sd_ble_gatts_hvx(p_its->conn_handle, &hvx_params);     
}

uint32_t ble_its_img_info_send(ble_its_t * p_its, ble_its_img_info_t * img_info)
{
    uint8_t data_buf[1 + sizeof(ble_its_img_info_t)];
    ble_gatts_hvx_params_t hvx_params;

    VERIFY_PARAM_NOT_NULL(p_its);

    if ((p_its->conn_handle == BLE_CONN_HANDLE_INVALID) || (!p_its->is_info_char_notification_enabled))
    {
        return NRF_ERROR_INVALID_STATE;
    }

    uint16_t length = 1 + sizeof(ble_its_img_info_t);

    data_buf[0] = 1;
    memcpy(&data_buf[1], img_info, sizeof(ble_its_img_info_t));
    
    memset(&hvx_params, 0, sizeof(hvx_params));
    
    hvx_params.handle = p_its->img_info_handles.value_handle;
    hvx_params.p_data = data_buf;
    hvx_params.p_len  = &length;
    hvx_params.type   = BLE_GATT_HVX_NOTIFICATION;

    return sd_ble_gatts_hvx(p_its->conn_handle, &hvx_params);    
}


uint32_t ble_its_send_file(ble_its_t * p_its, uint8_t * p_data, uint32_t data_length, uint32_t max_packet_length)
{
    uint32_t err_code; 
    
    if ((p_its->conn_handle == BLE_CONN_HANDLE_INVALID) || (!p_its->is_notification_enabled))
    {
        return NRF_ERROR_INVALID_STATE;
    } 
    
    if(file_size != 0)
    {
        return NRF_ERROR_BUSY;
    }
    
    ble_its_img_info_t image_info;
    image_info.file_size_bytes = data_length;
    ble_its_img_info_send(p_its, &image_info);
    
    file_size = data_length;
    file_pos = 0;
    file_data = p_data;
    m_max_data_length = max_packet_length;
    m_its = p_its;
   
    err_code = push_data_packets();
    if(err_code == NRF_ERROR_RESOURCES) return NRF_SUCCESS;
    return err_code;
}


uint32_t ble_its_send_file_fragment(ble_its_t * p_its, uint8_t * p_data, uint32_t data_length)
{
    uint32_t err_code; 
    
    if ((p_its->conn_handle == BLE_CONN_HANDLE_INVALID) || (!p_its->is_notification_enabled))
    {
        return NRF_ERROR_INVALID_STATE;
    } 
    
    if(file_size != 0)
    {
        return NRF_ERROR_BUSY;
    }
    
    err_code = ble_its_string_send(p_its, p_data, data_length);           
    return err_code;
}


bool ble_its_file_transfer_busy(void)
{
    return file_size != 0;
}

#endif // NRF_MODULE_ENABLED(BLE_NUS)

 

/**
 * Copyright (c) 2014 - 2018, Nordic Semiconductor ASA
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 * 
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 * 
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
 * 
 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 * 
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 */

#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 "nrf_sdh.h"
#include "nrf_sdh_soc.h"
#include "nrf_sdh_ble.h"
#include "nrf_ble_gatt.h"
#include "nrf_ble_qwr.h"
#include "app_timer.h"
#include "ble_image_transfer_service.h"
#include "app_uart.h"
#include "app_util_platform.h"
#include "bsp_btn_ble.h"
#include "nrf_pwr_mgmt.h"
#include "nrf_drv_spi.h"
#include "hx_drv_tflm.h"


#if defined (UART_PRESENT)
#include "nrf_uart.h"
#endif
#if defined (UARTE_PRESENT)
#include "nrf_uarte.h"
#endif

#include "nrf_delay.h"

#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

#define PCA10056_USE_FRONT_HEADER       0                                           /**< Use the front header (P24) for the camera module. Requires SB10-15 and SB20-25 to be soldered/cut, as described in the readme. */

#define APP_BLE_CONN_CFG_TAG            1                                           /**< A tag identifying the SoftDevice BLE configuration. */

#define DEVICE_NAME                     "Camera Demo v2"                            /**< 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_BLE_OBSERVER_PRIO           3                                           /**< Application's BLE observer priority. You shouldn't need to modify this value. */

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

#define APP_ADV_DURATION                18000                                       /**< The advertising duration (180 seconds) in units of 10 milliseconds. */

#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(15, UNIT_1_25_MS)             /**< Minimum acceptable connection interval (20 ms), Connection interval uses 1.25 ms units. */
#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(15, 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)                       /**< 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)                      /**< 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. */

#define DEAD_BEEF                       0xDEADBEEF                                  /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */

#define UART_TX_BUF_SIZE                256                                         /**< UART TX buffer size. */
#define UART_RX_BUF_SIZE                256                                         /**< UART RX buffer size. */
#define SPI_SS_PIN    47    // P1.15
#define SPI_MISO_PIN  46    // P1.14
#define SPI_MOSI_PIN  45    // P1.13
#define SPI_SCK_PIN   44    // P1.12
#define SPI_INSTANCE   0    // Use SPI instance 0  // Use SPI instance 0. You can change this if needed.
static const nrf_drv_spi_t spi = NRF_DRV_SPI_INSTANCE(SPI_INSTANCE);

static uint8_t spi_tx_buf[1]; // Transmit buffer
static uint8_t spi_rx_buf[255]; // Receive buffer for image data
static uint32_t img_data_length = 0;
//static uint8_t img_data_buffer[255];

BLE_ITS_DEF(m_its, NRF_SDH_BLE_TOTAL_LINK_COUNT);                                   /**< BLE NUS service instance. */
NRF_BLE_GATT_DEF(m_gatt);                                                           /**< GATT module instance. */
NRF_BLE_QWR_DEF(m_qwr);                                                             /**< Context for the Queued Write module.*/
BLE_ADVERTISING_DEF(m_advertising);                                                 /**< Advertising module instance. */


static uint8_t m_new_resolution;
static uint8_t m_new_phy;
static uint8_t                          m_new_command_received = 0;
//static uint8_t                          m_new_resolution, m_new_phy;

static bool                             m_stream_mode_active = false;

static ble_its_ble_params_info_t        m_ble_params_info = {20, 50, 1, 1};

static uint16_t   m_conn_handle          = BLE_CONN_HANDLE_INVALID;                 /**< Handle of the current connection. */
static uint16_t   m_ble_its_max_data_len = BLE_GATT_ATT_MTU_DEFAULT - 3;            /**< Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic UART service module. */
static ble_uuid_t m_adv_uuids[]          =                                          /**< Universally unique service identifier. */
{
    {BLE_UUID_ITS_SERVICE, NUS_SERVICE_UUID_TYPE}
};

enum {APP_CMD_NOCOMMAND = 0, APP_CMD_SINGLE_CAPTURE, APP_CMD_START_STREAM, APP_CMD_STOP_STREAM, 
      APP_CMD_CHANGE_RESOLUTION, APP_CMD_CHANGE_PHY, APP_CMD_SEND_BLE_PARAMS};

/**@brief Function for assert macro callback.
 *
 * @details This function will be called in case of an assert in the SoftDevice.
 *
 * @warning This handler is an example only and does not fit a final product. You need to analyse
 *          how your product is supposed to react in case of Assert.
 * @warning On assert from the SoftDevice, the system can only recover on reset.
 *
 * @param[in] line_num    Line number of the failing ASSERT call.
 * @param[in] p_file_name File name of the failing ASSERT call.
 */
void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)
{
    app_error_handler(DEAD_BEEF, line_num, p_file_name);
}

hx_drv_sensor_image_config_t g_pimg_config;

/**@brief Function for initializing the timer module.
 */
static void timers_init(void)
{
    ret_code_t err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);
}


/**@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);
    
#if 0
    ble_gap_addr_t ble_address = {.addr_type = BLE_GAP_ADDR_TYPE_RANDOM_STATIC,
                                  .addr_id_peer = 0,
                                  .addr = {0xC3,0x11,0x99,0x33,0x44,0xFF}};
    err_code = sd_ble_gap_addr_set(&ble_address);
    APP_ERROR_CHECK(err_code);
#endif
}


/**@brief Function for handling Queued Write Module errors.
 *
 * @details A pointer to this function will be passed to each service which may need to inform the
 *          application about an error.
 *
 * @param[in]   nrf_error   Error code containing information about what went wrong.
 */
static void nrf_qwr_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}

// Initialize SPI for camera data read
static void spi_init(void)
{
    nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG;
    spi_config.ss_pin   = SPI_SS_PIN;
    spi_config.miso_pin = SPI_MISO_PIN;
    spi_config.mosi_pin = SPI_MOSI_PIN;
    spi_config.sck_pin  = SPI_SCK_PIN;
   // APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, NULL, NULL));
    ret_code_t err_code = nrf_drv_spi_init(&spi, &spi_config, NULL, NULL);
    if (err_code == NRF_SUCCESS)
    {
        NRF_LOG_INFO("SPI initialized successfully.");
    }
    else
    {
        NRF_LOG_ERROR("SPI initialization failed with error code: %d", err_code);
    }
}

//9701351320

// Capture a single image frame via SPI
static void capture_image_spi(void)
{
    // Assuming a command byte is needed to start the camera capture
    spi_tx_buf[0] = 0x55;  // Example command to trigger image capture
    ret_code_t err_code = nrf_drv_spi_transfer(&spi, spi_tx_buf, 1, NULL, 0);
    if (err_code == NRF_SUCCESS)
    {
        NRF_LOG_INFO("Camera capture command sent successfully.");
    }
    else
    {
        NRF_LOG_ERROR("Failed to send camera capture command: %d", err_code);
    }

    nrf_delay_ms(50);  // Delay for image capture completion

    // Read image data into buffer
    img_data_length = 0;
    memset(spi_rx_buf, 0, sizeof(spi_rx_buf));
    while (img_data_length < sizeof(spi_rx_buf))
    {
        err_code = nrf_drv_spi_transfer(&spi, NULL, 0, &spi_rx_buf[img_data_length], 1);  // Read one byte at a time
        if (spi_rx_buf[img_data_length] != 0xFF && spi_rx_buf[img_data_length] != 0x00)
        //if (err_code == NRF_SUCCESS)
        {
            img_data_length++;
        }
        else
        {
            NRF_LOG_ERROR("Failed to read image data: %d", err_code);
            break;
        }
    }

    if (img_data_length > 0)
    {
        NRF_LOG_INFO("Image data received: %d bytes", img_data_length);
    }
    else
    {
        NRF_LOG_WARNING("No image data received.");
    }
}



/**@brief Function for handling the data from the ITS Service.
 *
 * @details This function will process the data received from the ITS BLE Service.
 *
 * @param[in] p_its    ITS Service structure.
 * @param[in] p_data   Data received.
 * @param[in] length   Length of the data.
 */
/**@snippet [Handling the data received over BLE] */
static void its_data_handler(ble_its_t * p_its, uint8_t const * p_data, uint16_t length)
{
    switch(p_data[0])
    {
        case APP_CMD_SINGLE_CAPTURE:
            capture_image_spi();
            m_new_command_received = p_data[0];
            break;
        case APP_CMD_START_STREAM:
            m_stream_mode_active = true;
            m_new_command_received = p_data[0];
            break;
        case APP_CMD_STOP_STREAM:
            m_stream_mode_active = false;
            m_new_command_received = p_data[0];
            break;
        case APP_CMD_CHANGE_RESOLUTION:
            m_new_command_received = APP_CMD_CHANGE_RESOLUTION;
            m_new_resolution = p_data[1];
            NRF_LOG_INFO("Resolution changed to %d", m_new_resolution);
            break;
        case APP_CMD_CHANGE_PHY:
            m_new_command_received = APP_CMD_CHANGE_PHY;
            m_new_phy = p_data[1];
            NRF_LOG_INFO("PHY changed to %d", m_new_phy);
            break;
        default: 
            NRF_LOG_ERROR("Unknown command!!");
            break;
    }
}
/**@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_its_init_t     its_init;
    nrf_ble_qwr_init_t qwr_init = {0};

    // Initialize Queued Write Module.
    qwr_init.error_handler = nrf_qwr_error_handler;

    err_code = nrf_ble_qwr_init(&m_qwr, &qwr_init);
    APP_ERROR_CHECK(err_code);

    // Initialize ITS.
    memset(&its_init, 0, sizeof(its_init));

    its_init.data_handler = its_data_handler;

    err_code = ble_its_init(&m_its, &its_init);
    if (err_code == NRF_SUCCESS)
    {
        NRF_LOG_INFO("Image Transfer Service initialized successfully.");
    }
    else
    {
        NRF_LOG_ERROR("Failed to initialize Image Transfer Service: %d", err_code);
    }
    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)
{
    switch(p_evt->evt_type)
    {
        case BLE_CONN_PARAMS_EVT_SUCCEEDED:
            break;
            
        case BLE_CONN_PARAMS_EVT_FAILED:
            //err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
            //APP_ERROR_CHECK(err_code);
            NRF_LOG_ERROR("Conn params failed. Keep the connection anyway..");
            break;
    }
}


/**@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;
        case BLE_ADV_EVT_IDLE:
            NRF_LOG_INFO("BLE_ADV_EVT_IDLE...");
            err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);
            APP_ERROR_CHECK(err_code);
            break;
        default:
            break;
    }
}


/**@brief Function for handling BLE events.
 *
 * @param[in]   p_ble_evt   Bluetooth stack event.
 * @param[in]   p_context   Unused.
 */
static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
    uint32_t err_code;
    ble_its_on_ble_evt(p_ble_evt, &m_its);

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            NRF_LOG_INFO("Connected");
            err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
            APP_ERROR_CHECK(err_code);
            m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
            err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle);
            APP_ERROR_CHECK(err_code);
            ble_its_ble_params_info_send(&m_its, &m_ble_params_info);
            capture_image_spi();
            break;

        case BLE_GAP_EVT_DISCONNECTED:
            NRF_LOG_INFO("Disconnected");
            // LED indication will be changed when advertising starts.
            m_stream_mode_active = false;
            m_new_command_received = APP_CMD_CHANGE_RESOLUTION;
            m_new_resolution = 1;
            m_conn_handle = BLE_CONN_HANDLE_INVALID;
            break;
            
        case BLE_GAP_EVT_CONN_PARAM_UPDATE:
        {
            uint16_t max_con_int = p_ble_evt->evt.gap_evt.params.conn_param_update.conn_params.max_conn_interval;
            uint16_t min_con_int = p_ble_evt->evt.gap_evt.params.conn_param_update.conn_params.min_conn_interval;

            m_ble_params_info.con_interval = max_con_int;
            ble_its_ble_params_info_send(&m_its, &m_ble_params_info);
            NRF_LOG_INFO("Con params updated: CI %i, %i", (int)min_con_int, (int)max_con_int);
        } break;
            
        case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
        {
            NRF_LOG_DEBUG("PHY update request.");
            ble_gap_phys_t const phys =
            {
                BLE_GAP_PHY_AUTO,
                BLE_GAP_PHY_AUTO,
            };
            err_code = sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys);
            APP_ERROR_CHECK(err_code);
        } break;

        case BLE_GAP_EVT_PHY_UPDATE:
            m_ble_params_info.tx_phy = p_ble_evt->evt.gap_evt.params.phy_update.tx_phy;
            m_ble_params_info.rx_phy = p_ble_evt->evt.gap_evt.params.phy_update.rx_phy;    
            ble_its_ble_params_info_send(&m_its, &m_ble_params_info);
            NRF_LOG_INFO("Phy update: %i, %i", (int)m_ble_params_info.tx_phy, (int)m_ble_params_info.rx_phy);
            break;

        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;

        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;

        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;

        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;

        default:
            // No implementation needed.
            //NRF_LOG_INFO("BLE event not handled by app: %i", p_ble_evt->header.evt_id);
            break;
    }
}


/**@brief Function for the SoftDevice initialization.
 *
 * @details This function initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    ret_code_t err_code;

    err_code = nrf_sdh_enable_request();
    APP_ERROR_CHECK(err_code);

    uint32_t ram_start = 0;
    err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_sdh_ble_enable(&ram_start);
    APP_ERROR_CHECK(err_code);

    // Register BLE event handler
    NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
}


/**@brief Function for handling events from the GATT library. */
void gatt_evt_handler(nrf_ble_gatt_t * p_gatt, nrf_ble_gatt_evt_t const * p_evt)
{
    uint32_t data_length;
    if ((m_conn_handle == p_evt->conn_handle) && (p_evt->evt_id == NRF_BLE_GATT_EVT_ATT_MTU_UPDATED))
    {
        data_length = p_evt->params.att_mtu_effective - OPCODE_LENGTH - HANDLE_LENGTH;
        //m_ble_params_info.mtu = m_ble_its_max_data_len;
        
        NRF_LOG_INFO("gatt_event: ATT MTU is set to 0x%X (%d)", data_length, data_length);
    }
    else if ((m_conn_handle == p_evt->conn_handle) && (p_evt->evt_id == NRF_BLE_GATT_EVT_DATA_LENGTH_UPDATED))
    {
        data_length = p_evt->params.att_mtu_effective - OPCODE_LENGTH - HANDLE_LENGTH - 4;
        m_ble_its_max_data_len = data_length;
        m_ble_params_info.mtu = m_ble_its_max_data_len;
        ble_its_ble_params_info_send(&m_its, &m_ble_params_info);
        
        NRF_LOG_INFO("gatt_event: Data len is set to 0x%X (%d)", data_length, data_length);
    }
    //NRF_LOG_DEBUG("ATT MTU exchange completed. central 0x%x peripheral 0x%x",
      //            p_gatt->att_mtu_desired_central,
        //        p_gatt->att_mtu_desired_periph);
}


/**@brief Function for initializing the GATT library. */
void gatt_init(void)
{
    ret_code_t err_code;

    err_code = nrf_ble_gatt_init(&m_gatt, gatt_evt_handler);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_ble_gatt_att_mtu_periph_set(&m_gatt, NRF_SDH_BLE_GATT_MAX_MTU_SIZE);
    APP_ERROR_CHECK(err_code);
    
    err_code = nrf_ble_gatt_data_length_set(&m_gatt, BLE_CONN_HANDLE_INVALID, NRF_SDH_BLE_GAP_DATA_LENGTH);
    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_SLEEP:
            break;

        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(&m_advertising);
                if (err_code != NRF_ERROR_INVALID_STATE)
                {
                    APP_ERROR_CHECK(err_code);
                }
            }
            break;

        default:
            break;
    }
}


/**@brief   Function for handling app_uart events.
 *
 * @details This function will receive a single character from the app_uart module and append it to
 *          a string. The string will be be sent over BLE when the last character received was a
 *          'new line' '\n' (hex 0x0A) or if the string has reached the maximum data length.
 */
/**@snippet [Handling the data received over UART] */
void uart_event_handle(app_uart_evt_t * p_event)
{

}
/**@snippet [Handling the data received over UART] */


/**@brief  Function for initializing the UART module.
 */
/**@snippet [UART Initialization] */
static void uart_init(void)
{
    uint32_t                     err_code;
    app_uart_comm_params_t const comm_params =
    {
        RX_PIN_NUMBER,
        TX_PIN_NUMBER,
        RTS_PIN_NUMBER,
        CTS_PIN_NUMBER,
        APP_UART_FLOW_CONTROL_DISABLED,
        false,
#if defined (UART_PRESENT)
        NRF_UART_BAUDRATE_115200
#else
        NRF_UARTE_BAUDRATE_115200
#endif
    };

    APP_UART_FIFO_INIT(&comm_params,
                       UART_RX_BUF_SIZE,
                       UART_TX_BUF_SIZE,
                       uart_event_handle,
                       APP_IRQ_PRIORITY_LOWEST,
                       err_code);
    APP_ERROR_CHECK(err_code);
}
/**@snippet [UART Initialization] */


/**@brief Function for initializing the Advertising functionality.
 */
static void advertising_init(void)
{
    uint32_t               err_code;
    ble_advertising_init_t init;

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

    init.advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance = false;
    init.advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

    init.srdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.srdata.uuids_complete.p_uuids  = m_adv_uuids;

    init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;
    init.evt_handler = on_adv_evt;

    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
}


/**@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(void)
{
    bsp_event_t startup_event;

    uint32_t err_code = bsp_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS, bsp_event_handler);
    APP_ERROR_CHECK(err_code);

    err_code = bsp_btn_ble_init(NULL, &startup_event);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for initializing the nrf log module.
 */
static void log_init(void)
{
    ret_code_t err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();
}


/**@brief Function for handling the idle state (main loop).
 *
 * @details If there is no pending log operation, then sleep until next the next event occurs.
 */
static void idle_state_handle(void)
{
    while(NRF_LOG_PROCESS());
    sd_app_evt_wait();
}


/**@brief Function for starting advertising.
 */
static void advertising_start(void)
{
    uint32_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);
    APP_ERROR_CHECK(err_code);
}


void conn_evt_len_ext_set(bool status)
{
    ret_code_t err_code;
    ble_opt_t  opt;

    memset(&opt, 0x00, sizeof(opt));
    opt.common_opt.conn_evt_ext.enable = status ? 1 : 0;

    err_code = sd_ble_opt_set(BLE_COMMON_OPT_CONN_EVT_EXT, &opt);
    APP_ERROR_CHECK(err_code);
}

void data_len_set(uint8_t value)
{
    ret_code_t err_code;
    err_code = nrf_ble_gatt_data_length_set(&m_gatt, BLE_CONN_HANDLE_INVALID, value);
    APP_ERROR_CHECK(err_code);

}

void send_image_data_in_fragments(void)
{
    uint32_t ret_code;

    // Example variables
    uint32_t total_image_size = img_data_length; // Assuming `img_data_length` holds the total image size
    uint32_t bytes_sent = 0;                     // Counter for bytes sent

    while (bytes_sent < total_image_size)
    {
        // Calculate the fragment size (either max allowed or remaining bytes if smaller)
        uint32_t fragment_size = m_ble_its_max_data_len; // BLE max fragment size
        if (total_image_size - bytes_sent < fragment_size)
        {
            fragment_size = total_image_size - bytes_sent;
        }

        // Send the fragment over BLE
        ret_code = ble_its_send_file_fragment(&m_its, &spi_rx_buf[bytes_sent], fragment_size);
        
        // If successful, update bytes_sent to indicate progress
        if (ret_code == NRF_SUCCESS)
        {
            bytes_sent += fragment_size;
        }
        else if (ret_code == NRF_ERROR_RESOURCES) 
        {
            // BLE stack busy; wait for next attempt
            continue;
        }
        else
        {
            NRF_LOG_ERROR("Failed to send image fragment: %d", ret_code);
            break; // Exit loop on non-recoverable error
        }
    }

    if (bytes_sent == total_image_size)
    {
        NRF_LOG_INFO("Image data sent successfully: %d bytes", bytes_sent);
    }
    else
    {
        NRF_LOG_WARNING("Image data transfer incomplete. Sent: %d bytes out of %d", bytes_sent, total_image_size);
    }
}



/**@brief Application main function.
 */
int main(void)
{
    uart_init();
    log_init();
    timers_init();
    buttons_leds_init();
    ble_stack_init();
    gap_params_init();
    gatt_init();
    services_init();
    advertising_init();
    conn_params_init();
    sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE);
    spi_init();
    NRF_LOG_INFO("SPI Camera Data Read Demo started.");
    advertising_start();

   for (;;)
   {
     if (m_new_command_received != APP_CMD_NOCOMMAND)
      {
          uint32_t new_command = m_new_command_received;
          m_new_command_received = APP_CMD_NOCOMMAND;
          
          // Handle the received command
          switch(new_command)
          {
              case APP_CMD_SINGLE_CAPTURE:
                  capture_image_spi();
                  break;

              case APP_CMD_START_STREAM:
                  NRF_LOG_INFO("Stream mode enabled");
                  m_stream_mode_active = true;
                  break;

              case APP_CMD_STOP_STREAM:
                  NRF_LOG_INFO("Stream mode disabled");
                  m_stream_mode_active = false;
                  break;

              // Additional cases for resolution and PHY changes
//              case APP_CMD_CHANGE_RESOLUTION:
//                  //set_camera_resolution(m_new_resolution);  // Function to set resolution
//                  break;
//
//              case APP_CMD_CHANGE_PHY:
//                  set_ble_phy(m_new_phy);  // Function to set PHY
//                  break;

              default:
                  break;
          }
      }

      // Continuous streaming logic
      if (m_stream_mode_active)
      {
        capture_image_spi();
        if (img_data_length > 0)
        {
          // Send image data in fragments over BLE
          send_image_data_in_fragments();
        }
      }
      
      // Handle idle state
      idle_state_handle();
  }

}

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