Ble Central and Usb

[Amit_Deulkar]

We want to develop a product in which ble central device will take data from peripherals and send it using usb. Currently taking trials on nrf52840 dk. In this sample USB/ACM code is running. We merge ble central and usb code together in this central part is working but usb part is not working, when connected to pc not able to detect usb port.   

below is code 

/**
* Copyright (c) 2014 - 2020, 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.
*
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*
*/
/**
* @brief BLE LED Button Service central and client application main file.
*
* This example can be a central for up to 8 peripherals.
* The peripheral is called ble_app_blinky and can be found in the ble_peripheral
* folder.
*/

#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "nordic_common.h"
#include "nrf_sdh.h"
#include "nrf_sdh_ble.h"
#include "app_timer.h"
#include "bsp_btn_ble.h"
#include "ble.h"
#include "ble_hci.h"
#include "ble_advertising.h"
#include "ble_conn_params.h"
#include "ble_db_discovery.h"
#include "ble_lbs_c.h"
#include "ble_conn_state.h"
#include "nrf_ble_gatt.h"
#include "nrf_pwr_mgmt.h"
#include "nrf_ble_scan.h"
#include "nrf_drv_usbd.h"
#include "app_usbd_core.h"
#include "app_usbd.h"
#include "app_usbd_string_desc.h"
#include "app_usbd_cdc_acm.h"
#include "app_usbd_serial_num.h"
#include "boards.h"
#include "nrf_drv_power.h"
#include "nrf_drv_clock.h"
#include "app_util.h"

//#include "app_uart.h"
//#include "app_uart_fifo.h"

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

//#define RX_PIN_NUMBER 16
//#define TX_PIN_NUMBER 17

#define APP_BLE_CONN_CFG_TAG 1 /**< Tag that refers to the BLE stack configuration that is set with @ref sd_ble_cfg_set. The default tag is @ref APP_BLE_CONN_CFG_TAG. */
#define APP_BLE_OBSERVER_PRIO 3 /**< BLE observer priority of the application. There is no need to modify this value. */

#define CENTRAL_SCANNING_LED BSP_BOARD_LED_0
#define CENTRAL_CONNECTED_LED BSP_BOARD_LED_1
#define LEDBUTTON_LED BSP_BOARD_LED_2 /**< LED to indicate a change of state of the Button characteristic on the peer. */

#define LED_USB_RESUME (BSP_BOARD_LED_0)
#define LED_CDC_ACM_OPEN (BSP_BOARD_LED_1)
#define LED_CDC_ACM_RX (BSP_BOARD_LED_2)
#define LED_CDC_ACM_TX (BSP_BOARD_LED_3)

#define LEDBUTTON_BUTTON BSP_BUTTON_0 /**< Button that writes to the LED characteristic of the peer. */
#define BUTTON_DETECTION_DELAY APP_TIMER_TICKS(50) /**< Delay from a GPIOTE event until a button is reported as pushed (in number of timer ticks). */

static char const m_target_periph_name[] = "Craidlr_Peripheral" ;

static uint16_t m_ble_nus_max_data_len = BLE_GATT_ATT_MTU_DEFAULT - OPCODE_LENGTH - HANDLE_LENGTH; /**< Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic UART service module. */

#define CSS_SERVICE_UUID_TYPE BLE_UUID_TYPE_VENDOR_BEGIN

#define ECHOBACK_BLE_UART_DATA 1

BLE_NUS_C_DEF(m_ble_nus_c); /**< BLE Nordic UART Service (NUS) client instance. */
NRF_BLE_GATT_DEF(m_gatt); /**< GATT module instance. */
BLE_DB_DISCOVERY_DEF(m_db_disc); /**< Database discovery module instance. */
NRF_BLE_SCAN_DEF(m_scan); /**< Scanning Module instance. */
NRF_BLE_GQ_DEF(m_ble_gatt_queue, /**< BLE GATT Queue instance. */
NRF_SDH_BLE_CENTRAL_LINK_COUNT,
NRF_BLE_GQ_QUEUE_SIZE);

/**@brief NUS UUID. */
static ble_uuid_t const m_nus_uuid =
{
.uuid = BLE_UUID_CSS_SERVICE,
.type = CSS_SERVICE_UUID_TYPE
};

//for usb
#ifndef USBD_POWER_DETECTION
#define USBD_POWER_DETECTION true
#endif

static void cdc_acm_user_ev_handler(app_usbd_class_inst_t const * p_inst,
app_usbd_cdc_acm_user_event_t event);

#define CDC_ACM_COMM_INTERFACE 0
#define CDC_ACM_COMM_EPIN NRF_DRV_USBD_EPIN2

#define CDC_ACM_DATA_INTERFACE 1
#define CDC_ACM_DATA_EPIN NRF_DRV_USBD_EPIN1
#define CDC_ACM_DATA_EPOUT NRF_DRV_USBD_EPOUT1

/**
* @brief CDC_ACM class instance
* */
APP_USBD_CDC_ACM_GLOBAL_DEF(m_app_cdc_acm,
cdc_acm_user_ev_handler,
CDC_ACM_COMM_INTERFACE,
CDC_ACM_DATA_INTERFACE,
CDC_ACM_COMM_EPIN,
CDC_ACM_DATA_EPIN,
CDC_ACM_DATA_EPOUT,
APP_USBD_CDC_COMM_PROTOCOL_AT_V250
);

#define READ_SIZE 1

static char m_rx_buffer[READ_SIZE];
static char m_tx_buffer[NRF_DRV_USBD_EPSIZE];
static bool m_send_flag = 0;

/**
* @brief User event handler @ref app_usbd_cdc_acm_user_ev_handler_t (headphones)
* */
static void cdc_acm_user_ev_handler(app_usbd_class_inst_t const * p_inst,
app_usbd_cdc_acm_user_event_t event)
{
app_usbd_cdc_acm_t const * p_cdc_acm = app_usbd_cdc_acm_class_get(p_inst);

switch (event)
{
case APP_USBD_CDC_ACM_USER_EVT_PORT_OPEN:
{
bsp_board_led_on(LED_CDC_ACM_OPEN);

/*Setup first transfer*/
ret_code_t ret = app_usbd_cdc_acm_read(&m_app_cdc_acm,
m_rx_buffer,
READ_SIZE);
UNUSED_VARIABLE(ret);
break;
}
case APP_USBD_CDC_ACM_USER_EVT_PORT_CLOSE:
bsp_board_led_off(LED_CDC_ACM_OPEN);
break;
case APP_USBD_CDC_ACM_USER_EVT_TX_DONE:
bsp_board_led_invert(LED_CDC_ACM_TX);
break;
case APP_USBD_CDC_ACM_USER_EVT_RX_DONE:
{
ret_code_t ret;
NRF_LOG_INFO("Bytes waiting: %d", app_usbd_cdc_acm_bytes_stored(p_cdc_acm));
do
{
/*Get amount of data transfered*/
size_t size = app_usbd_cdc_acm_rx_size(p_cdc_acm);
NRF_LOG_INFO("RX: size: %lu char: %c", size, m_rx_buffer[0]);

/* Fetch data until internal buffer is empty */
ret = app_usbd_cdc_acm_read(&m_app_cdc_acm,
m_rx_buffer,
READ_SIZE);
} while (ret == NRF_SUCCESS);

bsp_board_led_invert(LED_CDC_ACM_RX);
break;
}
default:
break;
}
}

static void usbd_user_ev_handler(app_usbd_event_type_t event)
{
switch (event)
{
case APP_USBD_EVT_DRV_SUSPEND:
bsp_board_led_off(LED_USB_RESUME);
break;
case APP_USBD_EVT_DRV_RESUME:
bsp_board_led_on(LED_USB_RESUME);
break;
case APP_USBD_EVT_STARTED:
break;
case APP_USBD_EVT_STOPPED:
app_usbd_disable();
bsp_board_leds_off();
break;
case APP_USBD_EVT_POWER_DETECTED:
NRF_LOG_INFO("USB power detected");

if (!nrf_drv_usbd_is_enabled())
{
app_usbd_enable();
}
break;
case APP_USBD_EVT_POWER_REMOVED:
NRF_LOG_INFO("USB power removed");
app_usbd_stop();
break;
case APP_USBD_EVT_POWER_READY:
NRF_LOG_INFO("USB ready");
app_usbd_start();
break;
default:
break;
}
}

/**@brief Function for handling asserts in the SoftDevice.
*
* @details This function is called in case of an assert in the SoftDevice.
*
* @warning This handler is only an example and is not meant for the final product. You need to analyze
* how your product is supposed to react in case of an 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(0xDEADBEEF, line_num, p_file_name);
}

/**@brief Function for handling the LED Button Service Client errors.
*
* @param[in] nrf_error Error code containing information about what went wrong.
*/
static void lbs_error_handler(uint32_t nrf_error)
{
APP_ERROR_HANDLER(nrf_error);
}

/**@brief Function for the LEDs initialization.
*
* @details Initializes all LEDs used by the application.
*/
static void leds_init(void)
{
bsp_board_init(BSP_INIT_LEDS);
}

static void scan_evt_handler(scan_evt_t const * p_scan_evt)
{
ret_code_t err_code;

switch(p_scan_evt->scan_evt_id)
{
case NRF_BLE_SCAN_EVT_CONNECTING_ERROR:
{
err_code = p_scan_evt->params.connecting_err.err_code;
APP_ERROR_CHECK(err_code);
} break;

default:
break;
}
}

/**@brief Function for initializing the scanning and setting the filters.
*/
static void scan_init(void)
{
ret_code_t err_code;
nrf_ble_scan_init_t init_scan;

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

init_scan.connect_if_match = true;
init_scan.conn_cfg_tag = APP_BLE_CONN_CFG_TAG;

err_code = nrf_ble_scan_init(&m_scan, &init_scan, scan_evt_handler);
APP_ERROR_CHECK(err_code);

err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_NAME_FILTER, m_target_periph_name);
APP_ERROR_CHECK(err_code);

err_code = nrf_ble_scan_filters_enable(&m_scan, NRF_BLE_SCAN_NAME_FILTER, false);
APP_ERROR_CHECK(err_code);
}

/**@brief Function for starting scanning. */
static void scan_start(void)
{
ret_code_t ret;

NRF_LOG_INFO("Start scanning for device name %s.", (uint32_t)m_target_periph_name);
ret = nrf_ble_scan_start(&m_scan);
APP_ERROR_CHECK(ret);
// Turn on the LED to signal scanning.
bsp_board_led_on(CENTRAL_SCANNING_LED);
}

static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
ret_code_t err_code;
ble_gap_evt_t const * p_gap_evt = &p_ble_evt->evt.gap_evt;

switch (p_ble_evt->header.evt_id)
{
case BLE_GAP_EVT_CONNECTED:
err_code = ble_nus_c_handles_assign(&m_ble_nus_c, p_ble_evt->evt.gap_evt.conn_handle, NULL);
APP_ERROR_CHECK(err_code);

err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
APP_ERROR_CHECK(err_code);

bsp_board_led_on(CENTRAL_CONNECTED_LED);

// start discovery of services. The NUS Client waits for a discovery result
err_code = ble_db_discovery_start(&m_db_disc, p_ble_evt->evt.gap_evt.conn_handle);
APP_ERROR_CHECK(err_code);
break;

case BLE_GAP_EVT_DISCONNECTED:

NRF_LOG_INFO("Disconnected. conn_handle: 0x%x, reason: 0x%x",
p_gap_evt->conn_handle,
p_gap_evt->params.disconnected.reason);
break;

case BLE_GAP_EVT_TIMEOUT:
if (p_gap_evt->params.timeout.src == BLE_GAP_TIMEOUT_SRC_CONN)
{
NRF_LOG_INFO("Connection Request timed out.");
}
break;

case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
// Pairing not supported.
err_code = sd_ble_gap_sec_params_reply(p_ble_evt->evt.gap_evt.conn_handle, BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP, NULL, NULL);
APP_ERROR_CHECK(err_code);
break;

case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST:
// Accepting parameters requested by peer.
err_code = sd_ble_gap_conn_param_update(p_gap_evt->conn_handle,
&p_gap_evt->params.conn_param_update_request.conn_params);
APP_ERROR_CHECK(err_code);
break;

case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
{
NRF_LOG_DEBUG("PHY update request.");
ble_gap_phys_t const phys =
{
.rx_phys = BLE_GAP_PHY_AUTO,
.tx_phys = 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_GATTC_EVT_TIMEOUT:
// Disconnect on GATT Client timeout event.
NRF_LOG_DEBUG("GATT Client Timeout.");
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.
NRF_LOG_DEBUG("GATT Server Timeout.");
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:
break;
}
}

///**@brief LED Button collector initialization. */
static void lbs_c_init(void)
{
ret_code_t err_code;
ble_lbs_c_init_t lbs_c_init_obj;

//lbs_c_init_obj.evt_handler = lbs_c_evt_handler;
lbs_c_init_obj.p_gatt_queue = &m_ble_gatt_queue;
lbs_c_init_obj.error_handler = lbs_error_handler;

for (uint32_t i = 0; i < NRF_SDH_BLE_CENTRAL_LINK_COUNT; i++)
{
// err_code = ble_lbs_c_init(&m_lbs_c[i], &lbs_c_init_obj);
APP_ERROR_CHECK(err_code);
}
}

/**@brief Function for initializing the BLE stack.
*
* @details Initializes the SoftDevice and the BLE event interrupts.
*/
static void ble_stack_init(void)
{
ret_code_t err_code;

err_code = nrf_sdh_enable_request();
APP_ERROR_CHECK(err_code);

// Configure the BLE stack using the default settings.
// Fetch the start address of the application RAM.
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);

// Enable BLE stack.
err_code = nrf_sdh_ble_enable(&ram_start);
APP_ERROR_CHECK(err_code);

// Register a handler for BLE events.
NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
}

/**@brief Function for initializing the button handler module.
*/
static void buttons_init(void)
{
ret_code_t err_code;

// The array must be static because a pointer to it is saved in the button handler module.
//static app_button_cfg_t buttons[] =
//{
// {LEDBUTTON_BUTTON, false, BUTTON_PULL, button_event_handler}
//};

// err_code = app_button_init(buttons, ARRAY_SIZE(buttons), BUTTON_DETECTION_DELAY);
APP_ERROR_CHECK(err_code);
}

/**@brief Function for handling database discovery events.
*
* @details This function is a callback function to handle events from the database discovery module.
* Depending on the UUIDs that are discovered, this function forwards the events
* to their respective services.
*
* @param[in] p_event Pointer to the database discovery event.
*/
//static void db_disc_handler(ble_db_discovery_evt_t * p_evt)
//{
// NRF_LOG_DEBUG("call to ble_lbs_on_db_disc_evt for instance %d and link 0x%x!",
// p_evt->conn_handle,
// p_evt->conn_handle);

// ble_lbs_on_db_disc_evt(&m_lbs_c[p_evt->conn_handle], p_evt);
//}
static void db_disc_handler(ble_db_discovery_evt_t * p_evt)
{
ble_nus_c_on_db_disc_evt(&m_ble_nus_c, p_evt);
}

/** @brief Database discovery initialization.
*/
static void db_discovery_init(void)
{
ble_db_discovery_init_t db_init;

memset(&db_init, 0, sizeof(ble_db_discovery_init_t));

db_init.evt_handler = db_disc_handler;
db_init.p_gatt_queue = &m_ble_gatt_queue;

ret_code_t err_code = ble_db_discovery_init(&db_init);
APP_ERROR_CHECK(err_code);
}

/**@brief Function for initializing power management.
*/
static void power_management_init(void)
{
ret_code_t err_code;
err_code = nrf_pwr_mgmt_init();
APP_ERROR_CHECK(err_code);
}

/**@brief Function for handling the idle state (main loop).
*
* @details This function handles any pending log operations, then sleeps until the next event occurs.
*/
static void idle_state_handle(void)
{
if (NRF_LOG_PROCESS() == false)
{
nrf_pwr_mgmt_run();
}
}

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

/**@brief Function for initializing the GATT module.
*/
static void gatt_init(void)
{
ret_code_t err_code = nrf_ble_gatt_init(&m_gatt, NULL);
APP_ERROR_CHECK(err_code);
}
static void ble_nus_chars_received_uart_print(uint8_t * p_data, uint16_t data_len)
{
ret_code_t ret_val;

NRF_LOG_DEBUG("Receiving data.");
NRF_LOG_HEXDUMP_DEBUG(p_data, data_len);

for (uint32_t i = 0; i < data_len; i++)
{
do
{
ret_val = app_uart_put(p_data[i]);
if ((ret_val != NRF_SUCCESS) && (ret_val != NRF_ERROR_BUSY))
{
NRF_LOG_ERROR("app_uart_put failed for index 0x%04x.", i);
APP_ERROR_CHECK(ret_val);
}
} while (ret_val == NRF_ERROR_BUSY);
}
if (p_data[data_len-1] == '\r')
{
while (app_uart_put('\n') == NRF_ERROR_BUSY);
}
if (ECHOBACK_BLE_UART_DATA)
{
// Send data back to the peripheral.
do
{
ret_val = ble_nus_c_string_send(&m_ble_nus_c, p_data, data_len);
if ((ret_val != NRF_SUCCESS) && (ret_val != NRF_ERROR_BUSY))
{
NRF_LOG_ERROR("Failed sending NUS message. Error 0x%x. ", ret_val);
APP_ERROR_CHECK(ret_val);
}
} while (ret_val == NRF_ERROR_BUSY);
}
}
/**@snippet [Handling events from the ble_nus_c module] */
static void ble_nus_c_evt_handler(ble_nus_c_t * p_ble_nus_c, ble_nus_c_evt_t const * p_ble_nus_evt)
{
ret_code_t err_code;

switch (p_ble_nus_evt->evt_type)
{
case BLE_NUS_C_EVT_DISCOVERY_COMPLETE:
NRF_LOG_INFO("Discovery complete.");
err_code = ble_nus_c_handles_assign(p_ble_nus_c, p_ble_nus_evt->conn_handle, &p_ble_nus_evt->handles);
APP_ERROR_CHECK(err_code);

err_code = ble_nus_c_tx_notif_enable(p_ble_nus_c);
APP_ERROR_CHECK(err_code);
NRF_LOG_INFO("Connected to device with Nordic UART Service.");
break;

case BLE_NUS_C_EVT_NUS_TX_EVT:
//ble_nus_chars_received_uart_print(p_ble_nus_evt->p_data, p_ble_nus_evt->data_len);
bsp_board_led_invert(LEDBUTTON_LED);
break;

case BLE_NUS_C_EVT_DISCONNECTED:
NRF_LOG_INFO("Disconnected.");
scan_start();
break;
}
}
static void nus_error_handler(uint32_t nrf_error)
{
APP_ERROR_HANDLER(nrf_error);
}
static void nus_c_init(void)
{
ret_code_t err_code;
ble_nus_c_init_t init;

init.evt_handler = ble_nus_c_evt_handler;
init.error_handler = nus_error_handler;
init.p_gatt_queue = &m_ble_gatt_queue;

err_code = ble_nus_c_init(&m_ble_nus_c, &init);
APP_ERROR_CHECK(err_code);
}

int main(void)
{

ret_code_t ret;
static const app_usbd_config_t usbd_config = {
.ev_state_proc = usbd_user_ev_handler
};

// Initialize.
log_init();

ret = nrf_drv_clock_init();
APP_ERROR_CHECK(ret);

nrf_drv_clock_lfclk_request(NULL);

while(!nrf_drv_clock_lfclk_is_running())
{
/* Just waiting */
}
timer_init();
leds_init();
buttons_init();
power_management_init();
ble_stack_init();
gatt_init();
db_discovery_init();
nus_c_init();
ble_conn_state_init();

app_usbd_serial_num_generate();

ret = app_usbd_init(&usbd_config);
APP_ERROR_CHECK(ret);
NRF_LOG_INFO("USBD CDC ACM example started.");

app_usbd_class_inst_t const * class_cdc_acm = app_usbd_cdc_acm_class_inst_get(&m_app_cdc_acm);
ret = app_usbd_class_append(class_cdc_acm);
APP_ERROR_CHECK(ret);

if (USBD_POWER_DETECTION)
{
ret = app_usbd_power_events_enable();
APP_ERROR_CHECK(ret);
}
else
{
NRF_LOG_INFO("No USB power detection enabled\r\nStarting USB now");

app_usbd_enable();
app_usbd_start();
}
scan_init();

// Start execution.
NRF_LOG_INFO("Multilink example started.");
// printf("Multilink example started.");
scan_start();

for (;;)
{
//idle_state_handle();
while (app_usbd_event_queue_process())
{
/* Nothing to do */
}
}
}

[ovrebekk]

Hi 

I would recommend using the Insert -> Code feature, or just attach the files directly, if you want to share code snippets. The cases become very messy with large chunks of code, and you miss proper code formatting. 

I don't think you should use the nrf_drv_power functions when using the SoftDevice. 

Could you please have a look at the usbd_ble_uart example in the examples/peripheral folder? 
This example is for a BLE peripheral and not central, but it will show you how to properly combine USB and BLE in the same example. 

Best regards
Torbjørn

[Amit_Deulkar]

Thanks for the response, we referred  the usbd_ble_uart example in that following function is used for power init which works but when we run same in our code controller get hanged, also attached main file of the code

/**
 * Copyright (c) 2014 - 2020, 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.
 *
 */
/**
 * @brief BLE LED Button Service central and client application main file.
 *
 * This example can be a central for up to 8 peripherals.
 * The peripheral is called ble_app_blinky and can be found in the ble_peripheral
 * folder.
 */

#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "nordic_common.h"
#include "nrf_sdh.h"
#include "nrf_sdh_ble.h"
#include "app_timer.h"
#include "bsp_btn_ble.h"
#include "ble.h"
#include "ble_hci.h"
#include "ble_advertising.h"
#include "ble_conn_params.h"
#include "ble_db_discovery.h"
#include "ble_lbs_c.h"
#include "ble_conn_state.h"
#include "nrf_ble_gatt.h"
#include "nrf_pwr_mgmt.h"
#include "nrf_ble_scan.h"
#include "nrf_drv_usbd.h"
#include "app_usbd_core.h"
#include "app_usbd.h"
#include "app_usbd_string_desc.h"
#include "app_usbd_cdc_acm.h"
#include "app_usbd_serial_num.h"
#include "boards.h"
#include "nrf_drv_power.h"
#include "nrf_drv_clock.h"
#include "app_util.h"
#include "nrf_gpio.h"
#include "nrf_delay.h"
#include "bsp.h"

//#include "app_uart.h"
//#include "app_uart_fifo.h"

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


//#define RX_PIN_NUMBER  16
//#define TX_PIN_NUMBER  17

#define APP_BLE_CONN_CFG_TAG      1                                     /**< Tag that refers to the BLE stack configuration that is set with @ref sd_ble_cfg_set. The default tag is @ref APP_BLE_CONN_CFG_TAG. */
#define APP_BLE_OBSERVER_PRIO     3                                     /**< BLE observer priority of the application. There is no need to modify this value. */

#define CENTRAL_SCANNING_LED      BSP_BOARD_LED_0
#define CENTRAL_CONNECTED_LED     BSP_BOARD_LED_1
#define LEDBUTTON_LED             BSP_BOARD_LED_2                       /**< LED to indicate a change of state of the Button characteristic on the peer. */


#define LED_USB_RESUME      (BSP_BOARD_LED_0)
#define LED_CDC_ACM_OPEN    (BSP_BOARD_LED_1)
#define LED_CDC_ACM_RX      (BSP_BOARD_LED_2)
#define LED_CDC_ACM_TX      (BSP_BOARD_LED_3)


#define LEDBUTTON_BUTTON          BSP_BUTTON_0                          /**< Button that writes to the LED characteristic of the peer. */
#define BUTTON_DETECTION_DELAY    APP_TIMER_TICKS(50)                   /**< Delay from a GPIOTE event until a button is reported as pushed (in number of timer ticks). */

#define BTN_CDC_DATA_SEND       0
#define BTN_CDC_NOTIFY_SEND     1

#define BTN_CDC_DATA_KEY_RELEASE        (bsp_event_t)(BSP_EVENT_KEY_LAST + 1)


static char const m_target_periph_name[] = "Craidlr_Peripheral" ; 

static uint16_t m_ble_nus_max_data_len = BLE_GATT_ATT_MTU_DEFAULT - OPCODE_LENGTH - HANDLE_LENGTH; /**< Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic UART service module. */

#define CSS_SERVICE_UUID_TYPE   BLE_UUID_TYPE_VENDOR_BEGIN

#define ECHOBACK_BLE_UART_DATA  1 

BLE_NUS_C_DEF(m_ble_nus_c);                                             /**< BLE Nordic UART Service (NUS) client instance. */
NRF_BLE_GATT_DEF(m_gatt);                                               /**< GATT module instance. */
BLE_DB_DISCOVERY_DEF(m_db_disc);                                        /**< Database discovery module instance. */
NRF_BLE_SCAN_DEF(m_scan);                                               /**< Scanning Module instance. */
NRF_BLE_GQ_DEF(m_ble_gatt_queue,                                        /**< BLE GATT Queue instance. */
               NRF_SDH_BLE_CENTRAL_LINK_COUNT,
               NRF_BLE_GQ_QUEUE_SIZE);

/**@brief NUS UUID. */
static ble_uuid_t const m_nus_uuid =
{
    .uuid = BLE_UUID_CSS_SERVICE,
    .type = CSS_SERVICE_UUID_TYPE
};

//for usb
#ifndef USBD_POWER_DETECTION
#define USBD_POWER_DETECTION true
#endif

static void cdc_acm_user_ev_handler(app_usbd_class_inst_t const * p_inst,
                                    app_usbd_cdc_acm_user_event_t event);

#define CDC_ACM_COMM_INTERFACE  0
#define CDC_ACM_COMM_EPIN       NRF_DRV_USBD_EPIN2

#define CDC_ACM_DATA_INTERFACE  1
#define CDC_ACM_DATA_EPIN       NRF_DRV_USBD_EPIN1
#define CDC_ACM_DATA_EPOUT      NRF_DRV_USBD_EPOUT1

/**
 * @brief CDC_ACM class instance
 * */
APP_USBD_CDC_ACM_GLOBAL_DEF(m_app_cdc_acm,
                            cdc_acm_user_ev_handler,
                            CDC_ACM_COMM_INTERFACE,
                            CDC_ACM_DATA_INTERFACE,
                            CDC_ACM_COMM_EPIN,
                            CDC_ACM_DATA_EPIN,
                            CDC_ACM_DATA_EPOUT,
                            APP_USBD_CDC_COMM_PROTOCOL_AT_V250
);

#define READ_SIZE 1

static char m_rx_buffer[READ_SIZE];
static char m_tx_buffer[NRF_DRV_USBD_EPSIZE];
static bool m_send_flag = 0;

/**
 * @brief User event handler @ref app_usbd_cdc_acm_user_ev_handler_t (headphones)
 * */
static void cdc_acm_user_ev_handler(app_usbd_class_inst_t const * p_inst,
                                    app_usbd_cdc_acm_user_event_t event)
{
    app_usbd_cdc_acm_t const * p_cdc_acm = app_usbd_cdc_acm_class_get(p_inst);

    switch (event)
    {
        case APP_USBD_CDC_ACM_USER_EVT_PORT_OPEN:
        {
            bsp_board_led_on(LED_CDC_ACM_OPEN);

            /*Setup first transfer*/
            ret_code_t ret = app_usbd_cdc_acm_read(&m_app_cdc_acm,
                                                   m_rx_buffer,
                                                   READ_SIZE);
            UNUSED_VARIABLE(ret);
            break;
        }
        case APP_USBD_CDC_ACM_USER_EVT_PORT_CLOSE:
            bsp_board_led_off(LED_CDC_ACM_OPEN);
            break;
        case APP_USBD_CDC_ACM_USER_EVT_TX_DONE:
            bsp_board_led_invert(LED_CDC_ACM_TX);
            break;
        case APP_USBD_CDC_ACM_USER_EVT_RX_DONE:
        {
            ret_code_t ret;
            NRF_LOG_INFO("Bytes waiting: %d", app_usbd_cdc_acm_bytes_stored(p_cdc_acm));
            do
            {
                /*Get amount of data transfered*/
                size_t size = app_usbd_cdc_acm_rx_size(p_cdc_acm);
                NRF_LOG_INFO("RX: size: %lu char: %c", size, m_rx_buffer[0]);

                /* Fetch data until internal buffer is empty */
                ret = app_usbd_cdc_acm_read(&m_app_cdc_acm,
                                            m_rx_buffer,
                                            READ_SIZE);
            } while (ret == NRF_SUCCESS);

            bsp_board_led_invert(LED_CDC_ACM_RX);
            break;
        }
        default:
            break;
    }
}

static void usbd_user_ev_handler(app_usbd_event_type_t event)
{
    switch (event)
    {
        case APP_USBD_EVT_DRV_SUSPEND:
            bsp_board_led_off(LED_USB_RESUME);
            break;
        case APP_USBD_EVT_DRV_RESUME:
            bsp_board_led_on(LED_USB_RESUME);
            break;
        case APP_USBD_EVT_STARTED:
            break;
        case APP_USBD_EVT_STOPPED:
            app_usbd_disable();
            bsp_board_leds_off();
            break;
        case APP_USBD_EVT_POWER_DETECTED:
            NRF_LOG_INFO("USB power detected");

            if (!nrf_drv_usbd_is_enabled())
            {
                app_usbd_enable();
            }
            break;
        case APP_USBD_EVT_POWER_REMOVED:
            NRF_LOG_INFO("USB power removed");
            app_usbd_stop();
            break;
        case APP_USBD_EVT_POWER_READY:
            NRF_LOG_INFO("USB ready");
            app_usbd_start();
            break;
        default:
            break;
    }
}




/**@brief Function for handling asserts in the SoftDevice.
 *
 * @details This function is called in case of an assert in the SoftDevice.
 *
 * @warning This handler is only an example and is not meant for the final product. You need to analyze
 *          how your product is supposed to react in case of an 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(0xDEADBEEF, line_num, p_file_name);
}


/**@brief Function for handling the LED Button Service Client errors.
 *
 * @param[in]   nrf_error   Error code containing information about what went wrong.
 */
static void lbs_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}



/**@brief Function for the LEDs initialization.
 *
 * @details Initializes all LEDs used by the application.
 */
static void leds_init(void)
{
    bsp_board_init(BSP_INIT_LEDS);
}


static void scan_evt_handler(scan_evt_t const * p_scan_evt)
{
    ret_code_t err_code;

    switch(p_scan_evt->scan_evt_id)
    {
        case NRF_BLE_SCAN_EVT_CONNECTING_ERROR:
        {
            err_code = p_scan_evt->params.connecting_err.err_code;
            APP_ERROR_CHECK(err_code);
        } break;

        default:
            break;
    }
}


/**@brief Function for initializing the scanning and setting the filters.
 */
static void scan_init(void)
{
    ret_code_t          err_code;
    nrf_ble_scan_init_t init_scan;

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

    init_scan.connect_if_match = true;
    init_scan.conn_cfg_tag     = APP_BLE_CONN_CFG_TAG;

    err_code = nrf_ble_scan_init(&m_scan, &init_scan, scan_evt_handler);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_NAME_FILTER, m_target_periph_name);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_ble_scan_filters_enable(&m_scan, NRF_BLE_SCAN_NAME_FILTER, false);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for starting scanning. */
static void scan_start(void)
{
    ret_code_t ret;

    NRF_LOG_INFO("Start scanning for device name %s.", (uint32_t)m_target_periph_name);
    ret = nrf_ble_scan_start(&m_scan);
    APP_ERROR_CHECK(ret);
    // Turn on the LED to signal scanning.
    bsp_board_led_on(CENTRAL_SCANNING_LED);
}

static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
    ret_code_t            err_code;
    ble_gap_evt_t const * p_gap_evt = &p_ble_evt->evt.gap_evt;

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            err_code = ble_nus_c_handles_assign(&m_ble_nus_c, p_ble_evt->evt.gap_evt.conn_handle, NULL);
            APP_ERROR_CHECK(err_code);

            err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
            APP_ERROR_CHECK(err_code);

            bsp_board_led_on(CENTRAL_CONNECTED_LED);

            // start discovery of services. The NUS Client waits for a discovery result
            err_code = ble_db_discovery_start(&m_db_disc, p_ble_evt->evt.gap_evt.conn_handle);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GAP_EVT_DISCONNECTED:

            NRF_LOG_INFO("Disconnected. conn_handle: 0x%x, reason: 0x%x",
                         p_gap_evt->conn_handle,
                         p_gap_evt->params.disconnected.reason);
            break;

        case BLE_GAP_EVT_TIMEOUT:
            if (p_gap_evt->params.timeout.src == BLE_GAP_TIMEOUT_SRC_CONN)
            {
                NRF_LOG_INFO("Connection Request timed out.");
            }
            break;

        case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
            // Pairing not supported.
            err_code = sd_ble_gap_sec_params_reply(p_ble_evt->evt.gap_evt.conn_handle, BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP, NULL, NULL);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST:
            // Accepting parameters requested by peer.
            err_code = sd_ble_gap_conn_param_update(p_gap_evt->conn_handle,
                                                    &p_gap_evt->params.conn_param_update_request.conn_params);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
        {
            NRF_LOG_DEBUG("PHY update request.");
            ble_gap_phys_t const phys =
            {
                .rx_phys = BLE_GAP_PHY_AUTO,
                .tx_phys = 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_GATTC_EVT_TIMEOUT:
            // Disconnect on GATT Client timeout event.
            NRF_LOG_DEBUG("GATT Client Timeout.");
            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.
            NRF_LOG_DEBUG("GATT Server Timeout.");
            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:
            break;
    }
}


///**@brief LED Button collector initialization. */
static void lbs_c_init(void)
{
    ret_code_t       err_code;
    ble_lbs_c_init_t lbs_c_init_obj;

    //lbs_c_init_obj.evt_handler   = lbs_c_evt_handler;
    lbs_c_init_obj.p_gatt_queue  = &m_ble_gatt_queue;
    lbs_c_init_obj.error_handler = lbs_error_handler;

    for (uint32_t i = 0; i < NRF_SDH_BLE_CENTRAL_LINK_COUNT; i++)
    {
       // err_code = ble_lbs_c_init(&m_lbs_c[i], &lbs_c_init_obj);
        APP_ERROR_CHECK(err_code);
    }
}


/**@brief Function for initializing the BLE stack.
 *
 * @details Initializes the SoftDevice and the BLE event interrupts.
 */
static void ble_stack_init(void)
{
    ret_code_t err_code;

    err_code = nrf_sdh_enable_request();
    APP_ERROR_CHECK(err_code);

    // Configure the BLE stack using the default settings.
    // Fetch the start address of the application RAM.
    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);

    // Enable BLE stack.
    err_code = nrf_sdh_ble_enable(&ram_start);
    APP_ERROR_CHECK(err_code);

    // Register a handler for BLE events.
    NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
}




/**@brief Function for initializing the button handler module.
 */
static void buttons_init(void)
{
    ret_code_t err_code;

   // The array must be static because a pointer to it is saved in the button handler module.
    //static app_button_cfg_t buttons[] =
    //{
    //    {LEDBUTTON_BUTTON, false, BUTTON_PULL, button_event_handler}
    //};

   // err_code = app_button_init(buttons, ARRAY_SIZE(buttons), BUTTON_DETECTION_DELAY);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling database discovery events.
 *
 * @details This function is a callback function to handle events from the database discovery module.
 *          Depending on the UUIDs that are discovered, this function forwards the events
 *          to their respective services.
 *
 * @param[in] p_event  Pointer to the database discovery event.
 */
//static void db_disc_handler(ble_db_discovery_evt_t * p_evt)
//{
//    NRF_LOG_DEBUG("call to ble_lbs_on_db_disc_evt for instance %d and link 0x%x!",
//                  p_evt->conn_handle,
//                  p_evt->conn_handle);

//    ble_lbs_on_db_disc_evt(&m_lbs_c[p_evt->conn_handle], p_evt);
//}
static void db_disc_handler(ble_db_discovery_evt_t * p_evt)
{
    ble_nus_c_on_db_disc_evt(&m_ble_nus_c, p_evt);
}

/** @brief Database discovery initialization.
 */
static void db_discovery_init(void)
{
    ble_db_discovery_init_t db_init;

    memset(&db_init, 0, sizeof(ble_db_discovery_init_t));

    db_init.evt_handler  = db_disc_handler;
    db_init.p_gatt_queue = &m_ble_gatt_queue;

    ret_code_t err_code = ble_db_discovery_init(&db_init);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing power management.
 */
static void power_management_init(void)
{
    ret_code_t err_code;
    err_code = nrf_pwr_mgmt_init();
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling the idle state (main loop).
 *
 * @details This function handles any pending log operations, then sleeps until the next event occurs.
 */
static void idle_state_handle(void)
{
    if (NRF_LOG_PROCESS() == false)
    {
        nrf_pwr_mgmt_run();
    }
}


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


/**@brief Function for initializing the GATT module.
 */
static void gatt_init(void)
{
    ret_code_t err_code = nrf_ble_gatt_init(&m_gatt, NULL);
    APP_ERROR_CHECK(err_code);
}
static void ble_nus_chars_received_uart_print(uint8_t * p_data, uint16_t data_len)
{
    ret_code_t ret_val;

    NRF_LOG_DEBUG("Receiving data.");
    NRF_LOG_HEXDUMP_DEBUG(p_data, data_len);

    for (uint32_t i = 0; i < data_len; i++)
    {
        do
        {
            ret_val = app_uart_put(p_data[i]);
            if ((ret_val != NRF_SUCCESS) && (ret_val != NRF_ERROR_BUSY))
            {
                NRF_LOG_ERROR("app_uart_put failed for index 0x%04x.", i);
                APP_ERROR_CHECK(ret_val);
            }
        } while (ret_val == NRF_ERROR_BUSY);
    }
    if (p_data[data_len-1] == '\r')
    {
        while (app_uart_put('\n') == NRF_ERROR_BUSY);
    }
    if (ECHOBACK_BLE_UART_DATA)
    {
        // Send data back to the peripheral.
        do
        {
            ret_val = ble_nus_c_string_send(&m_ble_nus_c, p_data, data_len);
            if ((ret_val != NRF_SUCCESS) && (ret_val != NRF_ERROR_BUSY))
            {
                NRF_LOG_ERROR("Failed sending NUS message. Error 0x%x. ", ret_val);
                APP_ERROR_CHECK(ret_val);
            }
        } while (ret_val == NRF_ERROR_BUSY);
    }
}
/**@snippet [Handling events from the ble_nus_c module] */
static void ble_nus_c_evt_handler(ble_nus_c_t * p_ble_nus_c, ble_nus_c_evt_t const * p_ble_nus_evt)
{
    ret_code_t err_code;

    switch (p_ble_nus_evt->evt_type)
    {
        case BLE_NUS_C_EVT_DISCOVERY_COMPLETE:
            NRF_LOG_INFO("Discovery complete.");
            err_code = ble_nus_c_handles_assign(p_ble_nus_c, p_ble_nus_evt->conn_handle, &p_ble_nus_evt->handles);
            APP_ERROR_CHECK(err_code);

            err_code = ble_nus_c_tx_notif_enable(p_ble_nus_c);
            APP_ERROR_CHECK(err_code);
            NRF_LOG_INFO("Connected to device with Nordic UART Service.");
            break;

        case BLE_NUS_C_EVT_NUS_TX_EVT:
            //ble_nus_chars_received_uart_print(p_ble_nus_evt->p_data, p_ble_nus_evt->data_len);
            bsp_board_led_invert(LEDBUTTON_LED); 
            break;

        case BLE_NUS_C_EVT_DISCONNECTED:
            NRF_LOG_INFO("Disconnected.");
            scan_start();
            break;
    }
}
static void nus_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}
static void nus_c_init(void)
{
    ret_code_t       err_code;
    ble_nus_c_init_t init;

    init.evt_handler   = ble_nus_c_evt_handler;
    init.error_handler = nus_error_handler;
    init.p_gatt_queue  = &m_ble_gatt_queue;

    err_code = ble_nus_c_init(&m_ble_nus_c, &init);
    APP_ERROR_CHECK(err_code);
}

static void bsp_event_callback(bsp_event_t ev)
{
    ret_code_t ret;
    switch ((unsigned int)ev)
    {
        case CONCAT_2(BSP_EVENT_KEY_, BTN_CDC_DATA_SEND):
        {
            m_send_flag = 1;
            break;
        }
        
        case BTN_CDC_DATA_KEY_RELEASE :
        {
            m_send_flag = 0;
            break;
        }

        case CONCAT_2(BSP_EVENT_KEY_, BTN_CDC_NOTIFY_SEND):
        {
            ret = app_usbd_cdc_acm_serial_state_notify(&m_app_cdc_acm,
                                                       APP_USBD_CDC_ACM_SERIAL_STATE_BREAK,
                                                       false);
            UNUSED_VARIABLE(ret);
            break;
        }

        default:
            return; // no implementation needed
    }
}
static void init_bsp(void)
{
    ret_code_t ret;
    ret = bsp_init(BSP_INIT_BUTTONS, bsp_event_callback);
    APP_ERROR_CHECK(ret);
    
    UNUSED_RETURN_VALUE(bsp_event_to_button_action_assign(BTN_CDC_DATA_SEND,
                                                          BSP_BUTTON_ACTION_RELEASE,
                                                          BTN_CDC_DATA_KEY_RELEASE));
    
    /* Configure LEDs */
    bsp_board_init(BSP_INIT_LEDS);
}


int main(void)
{

    ret_code_t ret;
    static const app_usbd_config_t usbd_config = {
        .ev_state_proc = usbd_user_ev_handler
    };

    // Initialize.
    log_init();

    ret = nrf_drv_clock_init();
    APP_ERROR_CHECK(ret);
    
    nrf_drv_clock_lfclk_request(NULL);

    while(!nrf_drv_clock_lfclk_is_running())
    {
        /* Just waiting */
    }
    timer_init();
    leds_init();
    buttons_init();
    power_management_init();
    ble_stack_init();
    gatt_init();
    db_discovery_init();
    nus_c_init();
    ble_conn_state_init();

    init_bsp();
   
    app_usbd_serial_num_generate();

    ret = app_usbd_init(&usbd_config);
    APP_ERROR_CHECK(ret);
    NRF_LOG_INFO("USBD CDC ACM example started.");

    app_usbd_class_inst_t const * class_cdc_acm = app_usbd_cdc_acm_class_inst_get(&m_app_cdc_acm);
    ret = app_usbd_class_append(class_cdc_acm);
    APP_ERROR_CHECK(ret);

    if (USBD_POWER_DETECTION)
    {
        ret = app_usbd_power_events_enable();
        APP_ERROR_CHECK(ret);
    }
    else
    {
        NRF_LOG_INFO("No USB power detection enabled\r\nStarting USB now");

        app_usbd_enable();
        app_usbd_start();
    }
    scan_init();

    // Start execution.
    NRF_LOG_INFO("Multilink example started.");
   // printf("Multilink example started.");
    scan_start();

    for (;;)
    {
       
        while (app_usbd_event_queue_process())
        {
            /* Nothing to do */
        }
        //idle_state_handle();
    }
}

ret_code_t nrf_drv_power_init(nrf_drv_power_config_t const * p_config)
{
    if (m_initialized)
    {
        return NRF_ERROR_MODULE_ALREADY_INITIALIZED;
    }

#ifdef SOFTDEVICE_PRESENT
    if (nrf_sdh_is_enabled())
    {
        return NRF_ERROR_INVALID_STATE;
    }
#endif
    if (p_config == NULL)
    {
        p_config = &m_drv_power_config_default;
    }

    ret_code_t err_code = nrfx_power_init(p_config);
    if (err_code == NRFX_SUCCESS)
    {
        m_initialized = true;
    }
    return err_code;
}

[ovrebekk]

Hi Amit

Can't you try to make the code more similar to the usbd_ble_uart sample? 

In this example the power_management module is not used, and you don't have to manually request the LF clock either, since this will be done by the SoftDevice once it is enabled. 

Without the power_management module used sleep is handled by simply calling the sd_app_evt_wait() function in the SoftDevice, which will put the CPU to sleep unless there is some processing to be done by the SoftDevice:

/** @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 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)
{
    UNUSED_RETURN_VALUE(NRF_LOG_PROCESS());
    power_manage();
}

Best regards
Torbjørn

[Amit_Deulkar]

Hello Sir,

Thanks for the reply, we made the changes as you suggest, but still cant detect usb port on pc. Attaching the code for your reference, can you please review it. 

int main(void)
{

    ret_code_t ret;
    static const app_usbd_config_t usbd_config = {
        .ev_state_proc = usbd_user_ev_handler
    };

    // Initialize.
    log_init();

    timer_init();
    leds_init();
    buttons_init();

    app_usbd_serial_num_generate();

    ret = nrf_drv_clock_init();
    APP_ERROR_CHECK(ret);

    ret = app_usbd_init(&usbd_config);
    APP_ERROR_CHECK(ret);
    NRF_LOG_INFO("USBD CDC ACM example started.");

    app_usbd_class_inst_t const * class_cdc_acm = app_usbd_cdc_acm_class_inst_get(&m_app_cdc_acm);
    ret = app_usbd_class_append(class_cdc_acm);
    APP_ERROR_CHECK(ret);

    ble_stack_init();
    gatt_init();
    db_discovery_init();
    nus_c_init();
    ble_conn_state_init();
   
    scan_init();

    // Start execution.
    NRF_LOG_INFO("Multilink example started.");
   // printf("Multilink example started.");

    ret = app_usbd_power_events_enable();
    APP_ERROR_CHECK(ret);

    scan_start();
    
    for (;;)
    {
       
        while (app_usbd_event_queue_process())
        {
            /* Nothing to do */
        }
    }
}

[Amit_Deulkar]

Hello Sir,

Any feedback.

[ovrebekk]

Hi Amit

Sorry for the slow response, I am just back from Easter holiday. 

Could you please just zip your project, including source and project files? 
Then I can easily test your code here. 

If you don't want to attach your project in a public ticket just let me know, and I will make the ticket private. 

Best regards
Torbjørn

[Amit_Deulkar]

Hello Sir,

Thanks for the response. Attaching zip file of the projectble_app_multilink_central1_160324.zip

[ovrebekk]

Hi Amit

Thanks for sharing the zip. 

I assume it is the ble_app_multilink_central1_160324\pca10056\s140\ses\ble_app_multilink_central_pca10056_s140.emProject I should open? 

This project doesn't build for me for some reason... 

Best regards
Torbjørn

[Amit_Deulkar]

Yes Sir it is ble_app_multilink_central1_160324

[Jared]

Hi Amit,

Torbjørn is currently out of office so I will handle this case in the meantime,

As Torbjørn mentioned, can you make sure to include everything that is needed to build the project successfully and add any instructions on where to place the example for it to build,

regards

Jared 

[Amit_Deulkar]

Hello Sir,

I have made changes in example code ble_app_multilink_central in ble central.  

[Jared]

Hi,

I tried building the project you sent earlier with nRF5SDK v17.1.0 but it returned several errors:

Can you specify which SDK version to use and provide a sample that builds successfully?

regards

Jared