NRF52 Bootloader hanging

RE: NRF52 Bootloader hanging

Hung Bui — Thu, 14 Jul 2016 13:50:50 GMT

@Chris: You can always reconfigure the bootloader so that you can run it in debug mode and add a breakpoint at the app_error_handler to track back on why it causes an error. Have a look here to know how to configure the bootloader for debugging.

RE: NRF52 Bootloader hanging

Chris — Thu, 14 Jul 2016 09:05:53 GMT

FYI this was the nRF52, bit hard to read here at the moment.

RE: NRF52 Bootloader hanging

Chris — Thu, 14 Jul 2016 08:54:56 GMT

Ok, this isn't exactly an answer as on earlier SDKs this didn't cause a problem but now it seems to. And why on earth it then causes an issue far after the following code and during the init of the SD I don't understand either.

But I tracked it down to this

#define BUTTONS_NUMBER 0
#define BUTTON_START   0
#define BUTTON_1       0
#define BUTTON_2       0
#define BUTTON_STOP    0



/**@brief Function for initializing the button module.
 */
static void buttons_init(void)
{

    nrf_gpio_cfg_sense_input(BOOTLOADER_BUTTON,
                             BUTTON_PULL,
                             NRF_GPIO_PIN_SENSE_LOW);
    
    nrf_gpio_cfg_sense_input(DIAGS_BUTTON,
                             BUTTON_PULL,
                             NRF_GPIO_PIN_SENSE_LOW);
    
}

Yes, I know, why define them if we're not using them. But this is a common file I use across a bunch of boards.

Anyway, it caused all the grief with the problem described above.

Don't init my lack of buttons. All working fine.

No idea why this has now caused a problem but it has... bit of a wild goose chase.

RE: NRF52 Bootloader hanging

Hung Bui — Thu, 14 Jul 2016 08:39:24 GMT

@Chris: Please let me know which chip you have on your board ? nRF52 or nRF51 ? And please read the laser marking on top of the chip. Please let me know what do you mean by "two oscillators on the boards" but "an external osc which isn't there" , I don't get it.

If you simply test S132 softdevice + default bootloader for nRF52 (PCA10040) what happens ?