RE: Steps to program nRF52840 Dongle with Mesh Serial Example

user115760 — Sat, 11 Jun 2022 05:40:56 GMT

Hi,
I have modified my Dongle to work with External power supply by cutting SB2 and soldering SB1.As the new versions of SDK have
REGOUT0 set for 3V for PCA10059 boards, I don't have to change it manually.The below code explains that.

Code location : C:\Nordic_Semi\nRF5_SDK_17.0.2_d674dde\components\boards\boards.c

#if defined(BOARD_PCA10059)
/**
 * Function for configuring UICR_REGOUT0 register
 * to set GPIO output voltage to 3.0V.
 */
static void gpio_output_voltage_setup(void)
{
    // Configure UICR_REGOUT0 register only if it is set to default value.
    if ((NRF_UICR->REGOUT0 & UICR_REGOUT0_VOUT_Msk) ==
        (UICR_REGOUT0_VOUT_DEFAULT << UICR_REGOUT0_VOUT_Pos))
    {
        NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen;
        while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}

        NRF_UICR->REGOUT0 = (NRF_UICR->REGOUT0 & ~((uint32_t)UICR_REGOUT0_VOUT_Msk)) |
                            (UICR_REGOUT0_VOUT_3V0 << UICR_REGOUT0_VOUT_Pos);

        NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
        while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}

        // System reset is needed to update UICR registers.
        NVIC_SystemReset();
    }
}
#endif

After following the above steps also, I won't be able to program my Dongle using my DK through SWD.I don't know what will be the problem.

My Questions:
1)Is my board permanently gets damaged?
2)In the definition of UART pins for PCA10059

#define RTS_PIN_NUMBER 21 // Mistakekenly defined PIN 21 instead of PIN 21

But, PIN 21 is not given as an GPIO pin for Dongle board.PIN 20 is the GPIO pin.I mistakenly changed the PIN 20 to PIN 21.
Does, this crashed my Dongle?
3)I have another Dongle which works perfectly.If I try to configure UART pins for that Dongle, which PINs I have to use
to make the board work perfectly without any defect?

Please reply as soon as possible.
Thankyou.

-Vicky

RE: Steps to program nRF52840 Dongle with Mesh Serial Example

user8164 — Fri, 10 Jun 2022 15:19:55 GMT

Hi,

There are some pitfalls and caveats when working with the Dongle, in particular if programming it using a programmer such as the one on a DK. Please have a look at the Using an external debugger sections of our nRF52840 Dongle Programming Tutorial.

Most importantly, VDD configuration is cruical for being able to program the Dongle using a DK. See Recover after an accidental UICR erase (in the same tutorial.)

Regards,
Terje