Buttonless DFU setting in Bootloader for nRF52832

RE: Buttonless DFU setting in Bootloader for nRF52832

Hung Bui — Fri, 21 Aug 2020 13:43:55 GMT

Hi,

It's a bit hard to get what exact issue you are having.
Could you record the phone's screen when you do DFU ?
When the device stuck, do you know if it stuck in the bootloader or it stuck in the application ? The bootloader is not a black box, you can add breakpoint and step in if you want.

For the bootloader to enter DFU mode you need to add the check for GPREGRET back in nrf_dfu_enter_check().

Please also verify that you can do DFU if you only flash the softdevice + bootloader.

RE: Buttonless DFU setting in Bootloader for nRF52832

Nagarjun — Fri, 21 Aug 2020 13:04:27 GMT

And also at debug output i get this,

<info> app: ADC event number: 15
<info> app: 713
<info> app: Received indication state 1
<info> app: hvx_len1 returned the err_code 3.
<info> app: len1 returned the err_code 3.
<info> app: sd_ble_gatts_hvx() returned the err_code 0.
��<info> app: Setting vector table to bootloader: 0x00078000
<info> app: Setting vector table to main app: 0x00023000

RE: Buttonless DFU setting in Bootloader for nRF52832

Nagarjun — Fri, 21 Aug 2020 09:27:14 GMT

[quote userid="2121" url="~/f/nordic-q-a/64999/buttonless-dfu-setting-in-bootloader-for-nrf52832/265612"]If you write to the dfu setting (and save it) s_dfu_settings.enter_buttonless_dfu = 1; then you trigger a reset to bootloader then it should work. [/quote]

I did not get you?

I am just planning to do DFU update. I have no problem entering DFU mode. the problem is after I enter, device turns off.

[quote userid="2121" url="~/f/nordic-q-a/64999/buttonless-dfu-setting-in-bootloader-for-nrf52832/265602"]GPREGRET is set (buttonless feature).[/quote]

As you mentioned in previous reply. , even though in my application this is set sd_power_gpregret_set(0, BOOTLOADER_DFU_START); and in the bootloader also I added GPREGRET method for buttonless feature still device turns off after entering DFU mode during update.

RE: Buttonless DFU setting in Bootloader for nRF52832

Hung Bui — Thu, 20 Aug 2020 15:57:56 GMT

How do you trigger DFU enter in your application (buttonless application) ?
If you write to the dfu setting (and save it) s_dfu_settings.enter_buttonless_dfu = 1; then you trigger a reset to bootloader then it should work.
But if you do s_dfu_settings.enter_buttonless_dfu = 1; in nrf_dfu_init() then I don't know what you are planning to do. This will just force the bootloader enter DFU mode all the time.
I strongly suggest you to study the code and have a rough idea of how it works before editing it.

RE: Buttonless DFU setting in Bootloader for nRF52832

Nagarjun — Thu, 20 Aug 2020 15:01:29 GMT

HI Hung,

Here is the overridden function below:

bool nrf_dfu_enter_check(void)
{	
	if (s_dfu_settings.enter_buttonless_dfu == 1)
    {
        s_dfu_settings.enter_buttonless_dfu = 0;
        APP_ERROR_CHECK(nrf_dfu_settings_write(NULL));
        return true;
    }
	return false;
}

How to to set GPREGRET ? I have set s_dfu_settings.enter_buttonless_dfu = 1; in nrf_dfu_init() function of nrf_dfu.c.

RE: Buttonless DFU setting in Bootloader for nRF52832

Hung Bui — Thu, 20 Aug 2020 14:58:00 GMT

Hi Nagarjun,

Please post the modification you made. How you override the function. What's inside your override function.
Note that the nrf_dfu_enter_check() has 2 checks first is to check if the button is pressed and second is to check if GPREGRET is set (buttonless feature).
In your case if you only want to get rid of button check you should remove :

    if (nrf_dfu_button_enter_check() == true)
    {
        return true;
    }