OTA fails,it stay at bootloader mode.

RE: OTA fails,it stay at bootloader mode.

Alice — Mon, 22 May 2017 02:17:30 GMT

It's OK now. There is something wrong with my PC

RE: OTA fails,it stay at bootloader mode.

bjorn-spockeli — Fri, 19 May 2017 13:59:24 GMT

Are you using the WDT in your application?

RE: OTA fails,it stay at bootloader mode.

bjorn-spockeli — Fri, 19 May 2017 10:48:08 GMT

Do you mean that after you flash the BL+Settings+Application+ SoftDevice the nRF52 jumps to the application? Or do you mean that you cannot etter the bootloader from the application? If its the latter , how are you triggering the switch from application to bootloader? Is it by holding down a button or have you implemented buttonless DFU?

RE: OTA fails,it stay at bootloader mode.

bjorn-spockeli — Fri, 19 May 2017 06:49:20 GMT

Hi Alice,

you are correct that the Secure Bootloader in SDK v12.x.x will not timeout if there is no DFU activity and jump to the original application.

You can implement a timeout using the WDT, see this answer, or you can use the RTC, see this answer. I recommend using the WDT approach as this is the easiest to implement.

Best regards

Bjørn