Programming nRF51822 with STlink on Windows
Revision as of 16:31, 30 September 2015 by Vaibhav Katkar (Talk | contribs)

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Sandeep (talk) and Vaibhav Katkar (talk) 17:43, 10 September 2015 (IST)

Getting STlink v1 working with openOCD is a pain. The USB driver implementation has flaws. The PC picks different drivers for the same device depending on its mood! Initially I got it working on my computer and to check I asked Vaibhav to try on his computer. He too wanted to use it to debug the LPC1114 MCU that he is working on for a last few weeks. It did not work, even after following the exact same steps. So we debugged and found out what the issue was.

Configuring Open OCD

Download OpenOCD zip file and extract its contents in any directory. There are two bin folders "bin" and "bin-x64" inside this directory. Depending on the version of the OS utilize the OpenOCD version.

Setting OpenOCD path

Right click on This PC and select properties. this will open "System" window, in system window click on Advanced System
Settings, it will open system properties. Now click on Environment Variables.
In this window select Path under System variables and click on Edit button as shown below

Give the path of bin file in openocd as C:\openocd\bin-x64, if you are usin 64-bit OS or C:\openocd\bin, if you are using 32-bit OS and click OK

Connecting STlink with nRF51822

Do the following connections

Remove links on CN3 connector of STlink
Power up NRF board from STlink
Do the connections of CN2 connector as shown in diagram

Reassigning the Driver

Now we have to install necessary drivers for STlink for working with openOCD. When we connect STM32 board to laptop drivers
gets automatically installed and STM32 detected as a USB mass storage device
If we start openOCD session it will not start as drivers are not supported and we will get error message on terminal

Reassigning Drivers

Download Zadig software to convert the driver
Open Zadig, click on Options and select List All Devices. Select STM32 Mass Storage among available devices.

Select WinUSB(v6.1.7600.16385) and click on Install WCID Driver. You will get a warning message for permission, simply click on Yes

Now you can check, the STlink will be detected under Universal Serial Bus Devices

Using Open OCD

After doing all the setup for openOCD, first step is to write a configuration file for NRF51822. Keep this config file in bin-x64
folder and open command window in the same folder and open session as shown below