Programming External Board (BC832) with nRF52840 DK

Question

Hello, I have read posts about programming external boards and want to use BC832 as a beacon. I have been trying to program it with nRF52840 DK and followed these operations: 
 
 Powering BC832 from P20 Pin 1 VDD nRF 
 Shorting P20 Pin 2 VDD and Pin 3 VTG for external programming 
 P20 SWDIO to SWDIO of BC832 
 P20 SWCLK to SWDCLK of BC832 
 Connecting GND and GND DETECT to GND of custom board 
 
 From these posts : https://devzone.nordicsemi.com/f/nordic-q-a/32661/external-programming-with-nrf5-dk-p20 https://devzone.nordicsemi.com/f/nordic-q-a/25424/can-t-program-bt832-module-using-nrf52-dk/100204#100204 My final wiring is like this : 
 Note: The battery on the board is not active. In nRFgo Studio, I erased all first then I programmed ble_app_beacon successfully (also ble_app_blinky). Then I scanned devices in nRF Connect. Unfortunately, BC832 (I know the advertising name is "Nordic_Blinky" ) was not on discovered devices list. Also, I programmed Soft Device s140, but nothing changed. I noticed that after I programmed blinky example, it says " Device must be programmed" in nRF Connect. After that, I connected to device first in nRF Connect then I programmed blinky example in nRFgo Studio, but again I didn't see BC832 on the discovered devices list. 
 There are 2 regions in nRFgo Studio : Application and SoftDevice 
 According to https://devzone.nordicsemi.com/f/nordic-q-a/51356/error-nrf_error_timeout-when-using-nrf-connect/206107#206107 , we can't connect to nRF Connect if we have a device that is flashed with firmware example. Therefore, I used nRF Connect app on a Android mobile to scan devices, but again there is no BC832. I am really confused about that. 
 I used Soft Device s140, SDK 16.0.0, nRF Connect 3.3.0. 
 My questions are : 
 1. Are the hardware connections correct ? 
 2. I know that I should program BC832 with Soft Device. At what point should I program BC832 with Soft Device. I mean how should I proceed step by step by using nRFgo Studio and nRF Connect. 3. Should I use SEGGER Embedded Studio instead of nRFgo Studio ? 
 4. Can I use Programming Bootloader in nRFgo Studio to use BC832 as a standalone application with a coin battery ? I am kind of new to this stuff so I will be very glad if you help me. 
 With Kind Regards

Jørgen Holmefjord · Accepted Answer

Hi, 
 
 Yes, from the schematics it looks like the wiring is correct. I can't comment on the physical connections, but I assume you have checked that these are correct according to the schematics? 
 From what I can see, Fanstel BC832 is a module based on nRF52832 IC. If you try to flash this with a S140 softdevice and application intended for nRF52840, it will most likely not work due to issues with RAM/Flash size, etc. You should try with S132 softdevice and examples for nRF52832 (PCA10040 project are for nRF52 DK board). 
 Yes, you should not use nRFGo Studio at all, this is deprecated. Use Segger Embedded Studio or nRF Connect Programmer App for application flashing. 
 Again, nRFGo Studio should not be used. You can program DFU bootloader through SES or nRF Connect. 
 
 Best regards, Jørgen

Jørgen Holmefjord · Answer

Please make sure you erase the board before flashing the softdevice and application, and make sure you use PCA10040 example and the softdevice supported by the SDK version where you found the example (Softdevice hex is found in components\softdevice\s132\hex). 
 From what I can see, your module does not come with a built-in 32.768 kHz crystal. This requires some changes to the code in order to run BLE examples. Please follow these instructions to configure the chip to use internal RC oscillator for LFCLK source.

Programming External Board (BC832) with nRF52840 DK

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