Hi All,
I have designed my custom pcb board for nrf52811. With the Jlink the IC is detected in visual studio code also it gets programmed. But i did not see its working when i use basic bluetooth application (becon), uart etc. kindly help on this , if there is hex file which i can directly flash into my board for confirming Bluetooth operation working. This is very urgent for us to get it done before CES2025.
Thanks
Ashok R
Hello Ashok,
Please have a look at this thread: nrf connect sd which I think may be relevant to your case. Does your board include the optional 32K crystal? If not, it's important that you change the LF clock source to use the internal RC oscillator by adding this line: "CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y" to your project configuration file (prj.conf). Otherwise, the program will enter an endless loop on startup waiting for the crystal oscillator to ramp up.
Best regards,
Vidar
Hi Vidar Berg
Thank you! I will try these things i have installed 32K crystal as well , unfortunate now the chip is not detecting itself.
Is there way to identify chip is dead/good in condition?
i will get back to you soon.
Thanks
Ashok
To use the DCDC regulator you need both inductors shown here: https://docs.nordicsemi.com/bundle/ps_nrf52811/page/ref_circuitry.html#ariaid-title3
Problem is that the DK board enables DCDC by default and the regulator will not be able to provide a stable supply to the chip without these, which will lead to problems when you try to re-program the chip again.
Which SDK version are you using?
Im using nRF Connect SDK Toolchain v2.8.0
adding 10uH on DCC pin can stable the supply? earlier the board was connecting multiple times i had flashed firmware multiple times.
Then you should change this property in the devicetree to use LDO (NRF5X_REG_MODE_LDO): https://github.com/nrfconnect/sdk-zephyr/blob/9097d5dac5a354c4fc0bff58785d08b6d6ad22e5/boards/nordic/nrf52840dk/nrf52840dk_nrf52811.dts#L97.
To recover the board you can try to solder on the inductor or run "nrfjprog --recover" in a loop. If that doesn't work, you can try the approach suggested by Kenneth here:
nRF52840 stuck after programming
Note that both inductors are required if you are going to use the DCDC regulator in your final FW.
adding 10uH on DCC pin can stable the supply? earlier the board was connecting multiple times i had flashed firmware multiple times.
I don't have an explanation for this.
Hi Vidar Berg
I recovered the board now, And created new example code "Blinky" example targeted for ubx_bmd360eval.
I also added the CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y in prj.conf
I connected LED to the pin P0.18, modified the blinky code to use led1 as per the ubx_bmd360eval_nrf52811.dts file at \v2.8.0\zephyr\boards\u-blox
But still the code does not works, kindly help on setting up debug option with jlink for VS code.
Thanks
ashokr.com said:But still the code does not works, kindly help on setting up debug option with jlink for VS code.
Can you try to elaborate a bit more than "does not work". Is the code executing, does the chip seem to start, if you are not using BLE, does the code run then? Maybe go a bit back to start, and just try a hello world sample or blinky project from nRF Connect SDK as-is. If the board have worked up until a certain point, it may also be that the board have been damaged some way, do you have a second board for comparison? Do connect pin reset (P0.21) directly to VDD show any change, what did you do to recover the board?
Kenneth
ashokr.com said:But still the code does not works, kindly help on setting up debug option with jlink for VS code.
Can you try to elaborate a bit more than "does not work". Is the code executing, does the chip seem to start, if you are not using BLE, does the code run then? Maybe go a bit back to start, and just try a hello world sample or blinky project from nRF Connect SDK as-is. If the board have worked up until a certain point, it may also be that the board have been damaged some way, do you have a second board for comparison? Do connect pin reset (P0.21) directly to VDD show any change, what did you do to recover the board?
Kenneth
Hi Kenneth
I have mention about the example which im using.. "Blinky", Also i mentioned the configuration of ubx_bmd360eval. board. In my custom board LED is connected to P0.18. So i had to edit dts file. but final result is led is not blinking.
You need to try to debug this a bit, for instance use the ozone debugger to find where it seems to fail/stop.
Kenneth
Kenneth I used ozone debugger and downloaded the elf file ,
After i start debugging LED started blinks. It stopped blinking after i end the debug session. I also did power cycle reset but the code does not starts. seems works only after i click start button on ozone debugger. Any idea?
