bootloader cannot start app

RE: bootloader cannot start app

djqtsg — Thu, 26 Oct 2017 04:46:55 GMT

I don't see any reason why the bootloader can't branch to application when power up but can when doing reset.

RE: bootloader cannot start app

Hung Bui — Wed, 25 Oct 2017 07:50:13 GMT

Could be some assertions occurred. You should check all the return code of each function and only continue if the return code is NRF_SUCCESS. Also when you enable a peripheral, make sure you have a loop to wait for the peripheral to be ready.

RE: bootloader cannot start app

djqtsg — Wed, 25 Oct 2017 02:11:08 GMT

yes, your are right.

my app gets stuck at some initialization stage, most likely uart_init, which is the first function being called. If I add some delay before it, the app can be started.

RE: bootloader cannot start app

Hung Bui — Tue, 24 Oct 2017 13:03:46 GMT

How do you know that it's stuck at nrf_bootloader_app_start_impl() ? if you simply couldn't step through that when debugging then it's normal. That function branch to application, you can't step through that, or you can but the debugger woudn't know the code in the application.

What you can do is to try putting a notification when your application start, for example turn on an LED. Just to check if it's branched to the application or not, or you can use debugger in your application to wait for the bootloader branch to the application.

I don't see any reason why the bootloader can't branch to application when power up but can when doing reset.

Could you check if it's related to any peripherals on your board that can't bootup quickly and may have a problem ?

You can try to comment out part of your code, as you can see that normal application can boot without problem.

RE: bootloader cannot start app

djqtsg — Tue, 24 Oct 2017 03:45:56 GMT

yes, I have no problem with the bootloader to do OTA. My app CAN be started as long as I don't power off the device, which is made by us with BMD 350 and a few SPI, I2C sensors.
I have tried to test an app which I combined sample UART and DFU service into; and the bootloader is able to start it in the case power off and on.

RE: bootloader cannot start app

Hung Bui — Mon, 23 Oct 2017 14:02:33 GMT

Hi,

Please describe step by step how you tested.

Especially how you flash your application. Have you used the bootloader to OTA your application ? If you haven't, please do.

Have you tried to test with an SDK example as application ?

RE: bootloader cannot start app

djqtsg — Mon, 23 Oct 2017 08:26:46 GMT

If I power on the device, bootloader cannot start my app; however, if I press reset button, it can.