How to merge one Application with DFU feature.

Question

Hello All, 
 
 I am trying to merge one of the application example with DFU feature. 
 Development setup - OS windows 10, 64 bit 
 IDE Segger embedded studio V_4.16 with nRF52 DK, sdk version 15 . 
 I have tried the this many times but i could not. Facing lot of problems from last week. 
 I have tried with combining secure dfu example with ble_proximity example and wise-versa. 
 But facing linking problems for some of the files./ remove .o files,/.h file not defined etc.. 
 So If some one knows the right procedure / steps how to merge/combining. 
 Then please let me know. 
 Provide your inputs. 
 
 Regards, 
 Rohit

Rohit · Accepted Answer

Hello Bjorm, 
 Thanks for helping to solve above issue. 
 Its ROM and RAM size issue. 
 Issue is resolved successfully. 
 
 Thanks, 
 Rohit

Rohit · Answer

Just addition to this we have to DISABLE 
 NRF_FRINTF_FLAG_AUTOMATIC_CR_ON_LF_ENABLED 
 in sdk_config.h file to see the info in the debug terminal when we debug the code so you can get the issue info with specific file. So we can edit the required change as mentioned in the degbug terminal. 
 plus nrf_log_logging and NRF_LOG_BACKEND_RTT_ENABLED should be enable in sdk_config.h file.

bjorn-spockeli · Answer

Hi Rohit, 
 i suggest that you take a look at the Buttonless DFU Template Application in our SDK. You need to add the following .c files to the project you want to add DFU support to 
 
 ble_dfu.c 
 ble_dfu_unbonded.c 
 ble_dfu_bonded.c 
 nrf_dfu_svci.c 
 
 Then you need to add the following snippet to main() after log_init() 
 // Initialize the async SVCI interface to bootloader before any interrupts are enabled.
 err_code = ble_dfu_buttonless_async_svci_init();
 APP_ERROR_CHECK(err_code);
 
 add the following snippet to services_init() 
 
 ble_dfu_buttonless_init_t dfus_init = {0};

 dfus_init.evt_handler = ble_dfu_evt_handler;

 err_code = ble_dfu_buttonless_init(&dfus_init);
 APP_ERROR_CHECK(err_code); 
 add the following function to main.c before services_init() 
 / YOUR_JOB: Update this code if you want to do anything given a DFU event (optional).
/**@brief Function for handling dfu events from the Buttonless Secure DFU service
 *
 * @param[in] event Event from the Buttonless Secure DFU service.
 */
static void ble_dfu_evt_handler(ble_dfu_buttonless_evt_type_t event)
{
 switch (event)
 {
 case BLE_DFU_EVT_BOOTLOADER_ENTER_PREPARE:
 {
 NRF_LOG_INFO("Device is preparing to enter bootloader mode.");

 // Prevent device from advertising on disconnect.
 ble_adv_modes_config_t config;
 advertising_config_get(&config);
 config.ble_adv_on_disconnect_disabled = true;
 ble_advertising_modes_config_set(&m_advertising, &config);

 // Disconnect all other bonded devices that currently are connected.
 // This is required to receive a service changed indication
 // on bootup after a successful (or aborted) Device Firmware Update.
 uint32_t conn_count = ble_conn_state_for_each_connected(disconnect, NULL);
 NRF_LOG_INFO("Disconnected %d links.", conn_count);
 break;
 }

 case BLE_DFU_EVT_BOOTLOADER_ENTER:
 // YOUR_JOB: Write app-specific unwritten data to FLASH, control finalization of this
 // by delaying reset by reporting false in app_shutdown_handler
 NRF_LOG_INFO("Device will enter bootloader mode.");
 break;

 case BLE_DFU_EVT_BOOTLOADER_ENTER_FAILED:
 NRF_LOG_ERROR("Request to enter bootloader mode failed asynchroneously.");
 // YOUR_JOB: Take corrective measures to resolve the issue
 // like calling APP_ERROR_CHECK to reset the device.
 break;

 case BLE_DFU_EVT_RESPONSE_SEND_ERROR:
 NRF_LOG_ERROR("Request to send a response to client failed.");
 // YOUR_JOB: Take corrective measures to resolve the issue
 // like calling APP_ERROR_CHECK to reset the device.
 APP_ERROR_CHECK(false);
 break;

 default:
 NRF_LOG_ERROR("Unknown event from ble_dfu_buttonless.");
 break;
 }
} 
 In sdk_config.h you will need to increase the NRF_SDH_BLE_VS_UUID_COUNT by 1 to accommodate the DFU service UUID which is a vendor-specific UUID. 
 Best regards 
 Bjørn

bjorn-spockeli · Answer

Error code 4 is NRF_ERROR_NO_MEM, so there is a function returning this and its is being caught by APP_ERROR_CHECK(err_code); 
 Set a breakpoint in app_error_handler_bare and look at the call stack to figure out which function it is.

How to merge one Application with DFU feature.

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