How to add buttonless_dfu and serial_dfu functions at the same time.

[June6]

Now the code in the application part has added the buttonless_dfu function, which has also been successfully implemented. But I ’m not familiar with serial_dfu, I don’t know how to continue to add serial_dfu function. And how to achieve coexistence of ble_dfu and serial_dfu in bootload code？

[Hung Bui]

Hi June, 

You can have a look at this case: https://devzone.nordicsemi.com/f/nordic-q-a/35431/dfu-over-ble-and-usb

I have an example for SDK v15.2 there. To find how to enter DFU bootloader mode from application, please study the ble_app_buttonless_dfu example. Check function enter_bootloader() and then ble_dfu_buttonless_bootloader_start_prepare(). The GPREGRET register is written before the application reset and enter bootloader. 

[June6]

Hi Hung Bui，

I have added the serial_dfu code with reference to this routine, and now I have a few questions:

1、Does uart need flow control during serial dfu? I am currently turning off serial port flow control because my hardware does not have two pins for flow control

2、In normal application operation, in addition to the buttonless method, I can also enter the upgrade mode by pressing the button. After pressing the button, I performed the following operations:

err_code = sd_power_gpregret_clr(0, 0xffffffff);
VERIFY_SUCCESS(err_code);

err_code = sd_power_gpregret_set(0, BOOTLOADER_DFU_START);
VERIFY_SUCCESS(err_code);

// Signal that DFU mode is to be enter to the power management module
nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_DFU);

Is this correct?

3、After entering the upgrade mode, what nrfutil command is used to upgrade the zip package into the chip?

[June6]

Hi Hung,

I tried it in the ble_uart_debug ses project transplanted based on SDK 15.3, there is already log output, the following is the log generated during the DFU process

<debug> nrf_dfu_serial: Received ping 1
<info> nrf_dfu_serial_uart: Allocated buffer 2000B08C
<info> nrf_dfu_req_handler: Invalid opcode received: 0x9.
<debug> nrf_dfu_req_handler: Request handling complete. Result: 0x2
<warning> nrf_dfu_serial: DFU request completed with result: 0x2
<debug> nrf_dfu_serial: Sending Response: [0x9, 0x2]
<debug> nrf_dfu_serial: Set receipt notif target: 0
<info> nrf_dfu_serial_uart: Allocated buffer 2000B08C
<debug> nrf_dfu_req_handler: Handle NRF_DFU_OP_RECEIPT_NOTIF_SET
<debug> nrf_dfu_req_handler: Request handling complete. Result: 0x1
<debug> nrf_dfu_serial: Sending Response: [0x2, 0x1]
<debug> nrf_dfu_serial: Received serial mtu
<info> nrf_dfu_serial_uart: Allocated buffer 2000B08C
<info> nrf_dfu_req_handler: Invalid opcode received: 0x7.
<debug> nrf_dfu_req_handler: Request handling complete. Result: 0x2
<warning> nrf_dfu_serial: DFU request completed with result: 0x2
<debug> nrf_dfu_serial: Sending Response: [0x7, 0x2]

Among them, I noticed a warning

<warning> nrf_dfu_serial: DFU request completed with result: 0x2

Will this be the key factor for my upgrade failure?

[Hung Bui]

Hi June, 

Could you verify that you can test my example in SDK v15.2 and it works without any issue ? 
This way we can rule out any issue with the hardware or nrfutil. 

[June6]

Your example program is normal on the 52832DK board, but on the 52840DK board, once the HWFC is turned off, although I have reduced the baud rate to 9600 and executed the MSDDisable command, the upgrade will still fail

Traceback (most recent call last):
  File "D:\Application\Python38\Scripts\nrfutil-script.py", line 11, in <module>
    load_entry_point('nrfutil==6.0.1', 'console_scripts', 'nrfutil')()
  File "D:\Application\Python38\lib\site-packages\click-7.1.1-py3.8.egg\click\core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "D:\Application\Python38\lib\site-packages\click-7.1.1-py3.8.egg\click\core.py", line 782, in main
    rv = self.invoke(ctx)
  File "D:\Application\Python38\lib\site-packages\click-7.1.1-py3.8.egg\click\core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "D:\Application\Python38\lib\site-packages\click-7.1.1-py3.8.egg\click\core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "D:\Application\Python38\lib\site-packages\click-7.1.1-py3.8.egg\click\core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "D:\Application\Python38\lib\site-packages\click-7.1.1-py3.8.egg\click\core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "D:\Application\Python38\lib\site-packages\nrfutil-6.0.1-py3.8.egg\nordicsemi\__main__.py", line 1055, in serial
    do_serial(package, port, connect_delay, flow_control, packet_receipt_notification, baud_rate, serial_number, True,
  File "D:\Application\Python38\lib\site-packages\nrfutil-6.0.1-py3.8.egg\nordicsemi\__main__.py", line 970, in do_serial
    dfu.dfu_send_images()
  File "D:\Application\Python38\lib\site-packages\nrfutil-6.0.1-py3.8.egg\nordicsemi\dfu\dfu.py", line 127, in dfu_send_images
    self._dfu_send_image(self.manifest.application)
  File "D:\Application\Python38\lib\site-packages\nrfutil-6.0.1-py3.8.egg\nordicsemi\dfu\dfu.py", line 100, in _dfu_send_image
    self.dfu_transport.send_firmware(data)
  File "D:\Application\Python38\lib\site-packages\nrfutil-6.0.1-py3.8.egg\nordicsemi\dfu\dfu_transport_serial.py", line 301, in send_firmware
    response['crc'] = self.__stream_data(data=data, crc=response['crc'], offset=i)
  File "D:\Application\Python38\lib\site-packages\nrfutil-6.0.1-py3.8.egg\nordicsemi\dfu\dfu_transport_serial.py", line 474, in __stream_data
    response = self.__calculate_checksum()
  File "D:\Application\Python38\lib\site-packages\nrfutil-6.0.1-py3.8.egg\nordicsemi\dfu\dfu_transport_serial.py", line 412, in __calculate_checksum
    raise NordicSemiException('Did not receive checksum response from DFU target. '
pc_ble_driver_py.exceptions.NordicSemiException: Did not receive checksum response from DFU target. If MSD is enabled on the target device, try to disable it ref. https://wiki.segger.com/index.php?title=J-Link-OB_SAM3U

[June6]

By the way, nrfutil version is 6.0.1.

[June6]

I upgraded nrfutil to 6.1.0, and the problem still exists. Your SDK 15.2 program is normal for the 52832dk board, but once the hwfc is closed on the 52840dk board, the DFU fails. And the sdk15.3 program that I transplanted fails to DFU in any case. I don't think it's a hardware or nrfutil problem. Because in your sdk15.2-based program, the DFU of 52832dk board is normal under all conditions, and everything is normal when the hwfc of 52840dk board is not closed