Put Nrf52 in Vootload mode

RE: Put Nrf52 in Vootload mode

Shimon_nohayo — Tue, 24 Nov 2020 16:49:56 GMT

Thank you,

Your idea solved the issue!

RE: Put Nrf52 in Vootload mode

Hung Bui — Tue, 24 Nov 2020 08:25:12 GMT

Hi Shimon,

Actually there is a trick to overcome this. By spec, when you do a softreset the GPIO will be reset (back to input no buffer connected) but not with waking up from System OFF. When you reset by waking up from system OFF the GPIO is preserved.
You can have a look at this similar case.

RE: Put Nrf52 in Vootload mode

Shimon_nohayo — Mon, 23 Nov 2020 14:47:12 GMT

Hi,

I did, I set the GPIO to '1' in the bootloader code.

If I understand correctly, the nRf52 perform reset and then it replaces the App with the Bootloader?

Is it possible to perform that without using the NVIC_SystemReset(); ?

I can not add a capacitor - there must be a method to overcome this issue.

RE: Put Nrf52 in Vootload mode

Hung Bui — Mon, 23 Nov 2020 14:35:37 GMT

Hi Shimon,

Have you tried to add the code to configure and set the GPIO pin inside the bootloader ?

If you already configured that and still it's not quick enough, you may need to consider to put a capacitor on the pin to hold it when the chip is switching between the application and the bootloader.

RE: Put Nrf52 in Vootload mode

Shimon_nohayo — Sun, 22 Nov 2020 14:52:07 GMT

Hi,

I believe I found the reason for thsi issue but I don't know how to solve it.

The power regulator on the board is enabled by one of the NRF52 GPIOs, when the device reset itself the board the GPIO goes low (or floating) and the board is turned off.

If I try to enter to bootloader mode, and during that holds the power push button of the board - the process successes, but if the board is power off during the reset the process files

Please advise how can I deal with this issue