Stm32F030 Timer Example Series Of Microcontrollers
Stm32F030 Timer Example Free When Also

If you want to use them with the legacy StdPeriph library, follow this tutorial instead.

Hardware timers keep counting up or down depending on the module until the timer period is reached.

This is done by calling TIMxCLKENABLE(), filling the fields of the Init member in the TIMHandleTypeDef structure and calling HALTIMBaseInit() and HALTIMBaseStart().

You can use the Preprocess Selected Lines command to see that the HALTIMGETCOUNTER() simply reads the CNT register of the timer.

This can be done by replacing a call to HALTIMBaseStart() with HALTIMBaseStartIT().

As long as you enable the interrupt by calling HALNVICEnableIRQ(), the timer will automatically trigger an interrupt handler function when the event occurs.

You can look up the interrupt function name in the startupstm32xxxx.c file.

The handler provided by HAL will automatically check which event caused the interrupt and invoke one of the specialized handlers like HALTIMPeriodElapsedCallback().

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Amongst them is an internal, factory-calibrated temperature sensor and a supply voltage sensor (that specifically senses VDDA, the analog supply voltage rail) connect to channels 16 and 17 of the internal ADC.

While I usually like the STM32 documentation, it was quite hard to implement code that produced realistic values.

However it is not stated anywhere (at least in Rev7, the current RM0091 revision) that this formula is only correct for a VDDA of exactly 3.30V.

The example code in section A.7.16 uses a normalization factor VDDAPPLI VDDCALIB that is applied directly to the temperature sensor raw output.

However, VDDAPPLI is not documented anywhere and define to 300 while VDDACALIB is defined to 330.

After some experimentation I found out that you need to actually continously measure the supply voltage in order to properly normalize the temperature output.

By doing this, you can normalize the raw temperature sensor output.

When running at VDDA3.0V, the computed temperature sensor output without applying said normalization is about -14C for my test circuit while actually being at about 18C.

Stm32F030 Timer Example Free When Also

Computing the internal supply voltage is essentially free when also computing the temperature because the VDDAPPLI VDDACALIB ratio is required for accurate temperature monitoring anyway.

Therefore, my code also contains functionality to get both the temperature sensor output and the voltage sensor output at the same time.

In contrast to the RM0091 example, my code computes the temperature in mC, yielding a resolution three orders of magnitude higher than the ST code example.

However, I suspect there are still inaccuracies introduced by inappropriate ordering of integral arithmetic operations.

In order to provide a well-documented reference, I implemented an easy-to-use codebase that continously senses both temperature and voltage at the same time.

In order to provide high interoperability, I implemented the hardware-specific part using the ChibiOS HAL.

The code was tested on a custom board utilizing the STM32F030F4 (that is, at the time of writing this, the cheapest STM32 microcontroller I could find) and checked for accuracy using the Fluke 289 multimeter.

Stm32F030 Timer Example Series Of Microcontrollers

For other microcontrollers in the STM32F0 series, the addresses for the three calibration values might need to be adjusted (although I suspect they are the same at least for a series of microcontrollers).

Larger controllers like the STM32F4 use a slightly different ADC configuration.

Maybe Ill create some hybrid code that also works for other families in the future.

The header file contains extensive documentation on the implementation details of the code.

Note that without modifying the code, it is not possible to continously monitor the temperature VDDA and use other ADC channels in the same program.

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