"java.lang.NullPointerException " while trying to upload the code for BLE 400

[anilkunchalaece]

Hi,

I am try to upload the code to the BLE 400 from waveshare with library

I installed the cp210x drivers (windows 10 64 bit) and it is showing com port also

It is uploading successfully but when i try to upload the code to the board it is showing following error

java.lang.NullPointerException
	at cc.arduino.packages.uploaders.SerialUploader.uploadUsingProgrammer(SerialUploader.java:314)
	at cc.arduino.packages.uploaders.SerialUploader.uploadUsingPreferences(SerialUploader.java:89)
	at cc.arduino.UploaderUtils.upload(UploaderUtils.java:78)
	at processing.app.SketchController.upload(SketchController.java:713)
	at processing.app.SketchController.exportApplet(SketchController.java:686)
	at processing.app.Editor$DefaultExportHandler.run(Editor.java:2149)
	at java.lang.Thread.run(Thread.java:745)

How to avoid this error ?

[dlabun]

When you go to upload the sketch do you have the COM port selected? Also, please let us know what version of the IDE you are using.

[anilkunchalaece]

Hi, Thanks for Quick Reply.

I selected the COM5, it is showing in the Device Manager also.
arduino version is 1.8.3

[dlabun]

It doesn't look like that board includes a programmer on it, that UART to USB adapter is only for looking at the serial port on the nRF chip. Do you have an external programmer you can use?

[anilkunchalaece]

I have nrf51-dk

[micooke]

@dlabun is correct - i have this board. Its attached to the serial pins, it is not a swd programmer.

You need to buy an stlink or equivalent to program the nrf5 series, and attach it to the programming pins swdio swdclk

[dlabun]

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