Booting in application and after a button press goning into DFU

Question

Hello, 
 
 I'm trying to modify the dfu_dual_bank_ble_s130_pca10028 bootloader so my device would start with the application and after a signal (with the button) it should start the DFU so it could be updated. 
 I'm using th nRF51422 (pca10028) uController with SDK 11, the S130 Softdevice and nRFutil 0.5.2. 
 Any Ideas how i could achiev that?

bjorn-spockeli · Accepted Answer

Hi Matthias, 
 The bootloader will start the application if there is a valid application present on the device. If the bootloader button is pressed or the GPREGRET registers is set to BOOTLOADER_DFU_START (0xB1) then the bootloader will stay in bootloader mode. 
 
 bool dfu_start = false;
 bool app_reset = (NRF_POWER->GPREGRET == BOOTLOADER_DFU_START);

 if (app_reset)
 {
 NRF_POWER->GPREGRET = 0;
 }
 
 dfu_start = app_reset;
 dfu_start |= ((nrf_gpio_pin_read(BOOTLOADER_BUTTON) == 0) ? true: false);
 
 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 (bootloader_app_is_valid(DFU_BANK_0_REGION_START) && !bootloader_dfu_sd_in_progress())
 {
 // Select a bank region to use as application region.
 // @note: Only applications running from DFU_BANK_0_REGION_START is supported.
 bootloader_app_start(DFU_BANK_0_REGION_START);
 } 
 
 dfu_app_handler.c is included in the application code, not the bootloader code, see the nRF5_SDK_11.0.0_89a8197\examples\ble_peripheral\ble_app_hrs\pca10028\s130_with_dfu project.

Booting in application and after a button press goning into DFU

Top Replies