Bootloader startup issue about power

RE: Bootloader startup issue about power

Kenneth — Mon, 27 Aug 2018 11:13:38 GMT

I am not sure what the problem is here. There is nothing in the nRF52832 that prevent it to work at 1.8V, 2.5V, 3.3V or other voltage within the operating conditions for that matter. If you have UART or similar connected, then it may be that you are feeding supply voltage through a input GPIO (e.g. RTS or RXD pins), if the input pin exceed VDD. Not sure if that is the case here, but something you may try to check. Does you application work on a devkit?

BEst regards,
Kenneth

RE: Bootloader startup issue about power

Ferhat B — Mon, 27 Aug 2018 08:36:25 GMT

I already checked.

I can toggle pins with "bootloader_secure_ble" main.c You can see code block below.

Pin 14 ligth my blink Led. And its ligthing.

Pin 16 DFU starting button. I tried jump apk at start by pushing button but coulndt.

int main(void)
{
    uint32_t ret_val;

    //nrf_gpio_pin_dir_set(16,NRF_GPIO_PIN_DIR_INPUT);           //
    //if (nrf_gpio_pin_read(16) == 1) nrf_bootloader_app_start(MAIN_APPLICATION_START_ADDR);

    nrf_gpio_pin_dir_set(3,NRF_GPIO_PIN_DIR_OUTPUT);           // Pwm Outputs
    nrf_gpio_pin_write(3,0);                                   //
    nrf_gpio_pin_dir_set(4,NRF_GPIO_PIN_DIR_OUTPUT);           // Pwm Outputs
    nrf_gpio_pin_write(4,0);

    nrf_gpio_pin_dir_set(14,NRF_GPIO_PIN_DIR_OUTPUT);           //Blink Led
    nrf_gpio_pin_write(14,1); //

    (void) NRF_LOG_INIT(NULL);

    NRF_LOG_INFO("Inside main\r\n");

    //leds_init();
    buttons_init();

    ret_val = nrf_bootloader_init();
    APP_ERROR_CHECK(ret_val);

    // Either there was no DFU functionality enabled in this project or the DFU module detected
    // no ongoing DFU operation and found a valid main application.
    // Boot the main application.
    nrf_bootloader_app_start(MAIN_APPLICATION_START_ADDR);

    // Should never be reached.
    NRF_LOG_INFO("After main\r\n");
}

RE: Bootloader startup issue about power

Kenneth — Mon, 27 Aug 2018 07:37:11 GMT

Can you check if the bootloader have any output pins that you make sure don't interfere with your hardware setup.

Best regards,
Kenneth

RE: Bootloader startup issue about power

Ferhat B — Fri, 24 Aug 2018 18:21:07 GMT

Hello Kenneth

Im having trouble when device start with bootloader area. Im using "bootloader_secure_ble" example. Im also having trouble without any apk loaded. Only sorftdeivce and bootcode. DFU_Targ appear without services when clicked.

When i erase bootloader area, and load my code after softdevice, there is no problem. Everything works fine.

Voltage level 3.29V

Monday, i will try to view with oscilloscope.

I dont have uart, twi or any other but i have pwm controlling transistors, An ADC input.

Thanks

Ferhat

RE: Bootloader startup issue about power

Kenneth — Mon, 20 Aug 2018 12:32:02 GMT

Hello,

Not sure if I understand, but can you make a trace of VDD when you experience the problem? I want to see voltage level of VDD and for instance fall and rise times, and when nRF52 stops.

Do you have any serial interface active here? For instance UART, TWI or similar that may be toggling when VDD changes? Maybe there is a problem with the flow control pins and/or uart framing error?

Best regards,
Kenneth