Bootloader starting never ends

[Inspectron]

When I try to update the application on the nRF51422 chip over DFU, I have trouble with the bootloader.

I use the nRF Toolbox app to do the firmware update. I can select the nRF51422 Device and my File which I want to load on the Chip.

When I click on the Update button it connects with the nRF51422 but it never ends to start the bootloader.

Here are the changes in my project for the DFU service:

I added these 3 files to my project:

-bootloader_util_arm.c

-dfu_app_handler.c

-ble_dfu.c

#include "ble_dfu.h"
#include "dfu_app_handler.h"

#define DFU_REV_MAJOR										0x00																				
#define DFU_REV_MINOR										0x01																				
#define DFU_REVISION										((DFU_REV_MAJOR << 8) | DFU_REV_MINOR)			

static ble_dfu_t                                            m_dfus;

static void services_init(void)
{
 ble_dfu_init_t   dfus_init;

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

 dfus_init.evt_handler    = dfu_app_on_dfu_evt;
 dfus_init.error_handler  = NULL; 
 dfus_init.evt_handler    = dfu_app_on_dfu_evt;
 dfus_init.revision       = DFU_REVISION;

 err_code = ble_dfu_init(&m_dfus, &dfus_init);
 APP_ERROR_CHECK(err_code);

 dfu_app_reset_prepare_set(reset_prepare);
}

static void ble_evt_dispatch(ble_evt_t * p_ble_evt)
{
   ble_dfu_on_ble_evt(&m_dfus, p_ble_evt);
}

What is missing? Or what is the reason for the problem to start the bootloader?

EDIT: I`m working with SDK 6.1 and nRF Toolbox 1.11.4

Log in Master Control Panel:

-Writing to Characteristic 1531

-gatt.writeCharacteristic(1531)

-Enabling notification for 1531

-gatt.writeDescriptor value = 0x01-00

-Error (0x85): GATT ERROR

-[CALLBACK] connection state chenged with status: 0 and new state: 0(DISCONNECT)

-Disconnected

I didnt change anything on the bootloader.hex file

[Hung Bui]

Hi Inspectron,

It's normal to have the device disconnected because it's switched to bootloader mode after you write 0x01 to the DFU control point. After that you supposed to reconnect to the DFU bootloader and do the firmware update.

If you use Master Control Panel (or nRFToolbox), when you connect to your application you don't have to write the DFU control point manually, the app will do that for you. You just have to select the firmware you want to update and the app will write 0x01 to control point then wait for the bootloader to start, then connect to bootloader and update the firmware.

I just tested with the bootloader and the ble_app_hrs_dfu app from SDK v6.1 and it worked fine.

[Inspectron]

I know that the device will disconnect when it switchs to bootloader mode. The Problem is when it start the booatloader it never ends to load. I have also other applilcation which works fine with the DFU service and the bootloader start without problems. But in this application it doesnt want to work. And I can not find out what is missing or wrong with the DFU part.

[Hung Bui]

@Inspectron: Is there any difference between the working application and your application ?

I think you would need to start debug the bootloader to see where it stuck. I assume that you don't see the bootloader advertising after you write 0x01 to the DFU control point ? To debug with the bootloader you would need to remove the optimization (set optimization to 0), remove Cross-Module Optimization. Then increase the size of the bootloader, move the address lower maybe to 0x3A000 and update BOOTLOADER_REGION_START to match with the updated address. Remember to completely erase the chip before you program the new bootloader. Then you can debug and set breakpoint, etc.

If it does advertise, you can try to record a sniffer trace to see what happens when the DFU app connect to the bootloader.

[Inspectron]

there is only one difference between these 2 application: The output pins are diffrent. I did remove a few #ifdef BLE_DFU_APP_SUPPORT but I think that this cant be the reason for this error. Well its not realy an error because it doesnt appear an error message. It just starts the bootloader but nothing happens anymore. It loads and loads until I cancel the upload

[Hung Bui]

@Inspectron: I heard from your message that you had it working. Could you have an update ?

[Inspectron]

Update for what? The Log?