Important changes to forums and questions
All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.
Experiments with mbed code on non-mkit nRF51822 hardware
Daniel Kucera.
47
replies
Hi guys,
for a long time I was trying to make this module work with mbed and finally I succeeded:
I am using PlatformIO and all what was needed was to set target board to BBC micro:bit in platformio.ini:
platform = nordicnrf51 board = bbcmicrobit framework = mbed upload_protocol = stlink
Daniel Kucera wrote:
Hi guys,
for a long time I was trying to make this module work with mbed and finally I succeeded:
I am using PlatformIO and all what was needed was to set target board to BBC micro:bit in platformio.ini:
platform = nordicnrf51
board = bbcmicrobit{{/media/uploads/eddienuel/connecting_nrfdk_external_module.png}}
framework = mbed
upload_protocol = stlink
Hi Please i have 2 of this module you are holding in your hand in the image. I have tried programming it with the nrf51-DK, but after pushing in the hex it looks lifeless and wont advertise as it was meant to. Here is the diagram i used for my connection. please Help how were you able to successfully make yours work. Thanks
Emmanuel Edwards wrote:
Hi Please i have 2 of this module you are holding in your hand in the image. I have tried programming it with the nrf51-DK, but after pushing in the hex it looks lifeless and wont advertise as it was meant to. Here is the diagram i used for my connection. please Help how were you able to successfully make yours work. Thanks
Hi Emmanuel, this answer comes probably too late for you but for reference I'll publish it. If you have the same variant as me "QFAAH2", this only has 16kB of RAM (see https://infocenter.nordicsemi.com/pdf/nRF51822_PS_v3.3.pdf?cp=4_4_0_0 page 76). nrf51-DK has 32kB which is required for running mbed 5 AKA mbed-rtos. If you want to use mbed 2, you need to use some other reference board for building, e.g. BBC:microbit.
So you can't longer flash with the use of BMP? Furthermore, how did you upload Softdevice to the chip. By flashing Softdevice through BMP and then your mBed code after through BMP? :)
David
I bought some of these http://www.wireless-tag.com/index.php/Product/dis/25.html (from AliExpress). They come with some AT based command firmware, and they are read protected, so you need to clear them before you can use them, which I found a bit tricky to do, as JLink didnt seem to be able to communicate with device at all while it was read protected. From what I recall I ended up using my Black Magic Probe to write some values to specific memory locations which forced a total erase of the device (Sorry, I should have written down the link, but at the time I was so relieved to have not bricked the device, I didn't think to document what I'd done)
I then managed to get MBED to to work on that module, by selecting the HRM1017 module for the project, as that module doesn't have the 32kHz crystal either.
Unfortunately I've been so busy with work, that I've not had time to write any more blog entries or do any more YouTube videos.
I have enhanced my Arduino for NRF51822 repo and you can no upload to the Waveshare (http://www.waveshare.com/wiki/Core51822 ) module using JLink as well as Black Magic Probe, but I've not had time to publicise this on my blog etc :-(
BTW. The Wireless-tag modules are OK, but because they don't have the 32kHz crystal it makes them useless for a lot of low power applications, as the power consumption in sleep is much higher than the modules with the 32kHz crystal.
I actually ended up buying a bag of 32kHz crystals and some 12pF capacitors, which I solder onto those boards, so that they can be programmed via the Arduino IDE, but mainly to get the current consumption down.