SDK9.0 DFU

[FormerMember]

the mcu is nrf51822，I use sdk9.0,

sdk9.0\examples\dfu\bootloader\pca10028\dual_bank_ble_s110\arm5_no_packs

1. In this project, I delete led，button，
2. change “dfu_start |= ((nrf_gpio_pin_read(BOOTLOADER_BUTTON) == 0) ? true: false);” to “dfu_start |=TRUE”
3. change the “SOFTDEVICE_HANDLER_APPSH_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, true);” to “SOFTDEVICE_HANDLER_APPSH_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, true);”
4. change the target “IRAM1 0x1380” and “ IRAM2 0x20003F80”

it can dfu，and start the new application program， but when I let it power off，and then power on，it back to advertising “DfuTarg”

[bjorn-spockeli]

This is the expected behavior you will get by setting dfu_start |= true;, i.e. dfu_start is always true. If you take a look at the code you'll see that you will always enter the following statement

 if (dfu_start || (!bootloader_app_is_valid(DFU_BANK_0_REGION_START)))
    {
        nrf_gpio_pin_clear(UPDATE_IN_PROGRESS_LED);

        // Initiate an update of the firmware.
        err_code = bootloader_dfu_start();
        APP_ERROR_CHECK(err_code);

        nrf_gpio_pin_set(UPDATE_IN_PROGRESS_LED);
    }

If you do not have a bootloader button in you design then I suggest that you just remove the line, i.e. alter the code from

dfu_start  = app_reset;
dfu_start |= ((nrf_gpio_pin_read(BOOTLOADER_BUTTON) == 0) ? true: false);

to

dfu_start  = app_reset;

Best regards

Bjørn

[FormerMember]

hello friend，thank you so much！problem is solved with your help ！hope you have a good day！

[bjorn-spockeli]

Happy to help Yangying :) I would appreciate if you could mark the answer as correct by clicking the checkmark in the circle to the left of the answer.