Accessing the Internal Temperature Sensor of the mDot MCU

[Szymon Zieba]

Hi,

I am attempting to access the internal temperature sensor of the mDot using the registry of the STM32f411xe. However I am finding difficulty as there seems to be very little documentation behind using and accessing the registry. I have been attempting several different methods in mBed, primarily involving ADC functions, and I am attempting applying the change directly using pointers, although I am unsure how to read the appropriate pin.

Does anyone have any suggestions on how to proceed? I need to be able to access the registry as my needs for the mDot require the ability to directly control its function.

[Mike Fiore]

Hi Szymon,

The STM32F411RE reference guide mentions the internal temperature sensor. See section 11.9.

http://www.st.com/content/ccc/resource/technical/document/reference_manual/9b/53/39/1c/f7/01/4a/79/DM00119316.pdf/files/DM00119316.pdf/jcr:content/translations/en.DM00119316.pdf

I think there also mbed PinNames defined for the internal analog input channels on the ST platforms. I think this change was added in mbed-os 5.2. With those PinNames defined, I think you should just have to create an AnalogIn object using the PinName for the internal ADC channel connected to the internal temp sensor and do a conversion.

Hope this helps!

Cheers,

Mike

[Leon Lindenfelser]

Hi Szymon,

ADC_TEMP is the peripheral pin in the mDot platform for the temp sensor. It is defined in the file:
mbed-os\targets\target_stm\target_stm32f4\target_mts_mdot_f411re\PeripheralPins.c

Kind regards,
Leon

[Szymon Zieba]

Thank you for your help.

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