Buttonless DFU not starting bootloader

RE: Buttonless DFU not starting bootloader

bjorn-spockeli — Mon, 13 Feb 2017 10:05:52 GMT

I did a quick test with the unaltered bootloader example in SDK v10.0 and the S130 ble_app_hrs example with DFU support, the OFF bit in the RESETREAS register was not set upon entry of main in the bootloader after DFU was initiated by the application.

RE: Buttonless DFU not starting bootloader

RPDben — Thu, 09 Feb 2017 09:20:53 GMT

I have done some further digging and have uncovered the issue. Whenever a DFU is initiated, the OFF bit in the RESETREAS register (high when the device is woken up from a pin reset) is set high when I believe it should be low. The line in question is this:

bool pin_wakeup = ((NRF_POWER->RESETREAS & POWER_RESETREAS_OFF_Msk) == POWER_RESETREAS_OFF_Msk);

Do you know why this is the case?

RE: Buttonless DFU not starting bootloader

bjorn-spockeli — Wed, 08 Feb 2017 11:51:42 GMT

If you reach the bootloader_util_app_start() call, then I would start a debug session in the bootloader and set a breakpoint in main(), after you've pressed run and it jumps to the application, to see if the branch operation performed in bootloader_util_app_start() was successful.

RE: Buttonless DFU not starting bootloader

RPDben — Wed, 08 Feb 2017 11:48:30 GMT

Hi Bjorn,

Yes, I reach that call after initiating a DFU update from the MCP. Is there anything else I should check?

I have looked through that example but cannot find much different between the example and my implementation.

RE: Buttonless DFU not starting bootloader

bjorn-spockeli — Wed, 08 Feb 2017 10:45:17 GMT

I assume that you have followed this step by step guide. Do you reach the bootloader_util_app_start(NRF_UICR->BOOTLOADERADDR) call in the bootloader_start() function in dfu_app_handler.c ? I also recommend that you take a look at the ble_app_hrs example with DFU in the SDK, you'll find it in examples\ble_peripheral\ble_app_hrs\pca10028\s130_with_dfu\arm5_no_packs.