Change the frequency of the square signal

[AAbed.1]

Hi

I am working on changing the frequency of the square signal which comes from STM32F4. I used Timer and ADC simultaneously where I change ARR and CCR1 accordingly to change the frequency. When I use an incremental loop for these values I can get different frequency but When I add ADC (continuous mode) in the fly of the program, the output gives me just one frequency and when I press the reset button with changing variable resistor I get updated value. How can I solve this issue? Is there another method to do that?

this is my code:

-----------------------------------------------------------------------

while (1)

{

AA=HAL_ADC_GetValue(&hadc1);

DT=0.5*AA;

htim3.Instance->ARR=AA;

htim3.Instance->CCR1=DT;

}

-------------------------------------------------------------------------

I will hear from you.

Thanks

[TDK]

HAL_ADC_GetValue only reads the last converted channel, it doesn't start a new conversion. Assuming you've set the ADC to convert continuously, your method should work.

From the reference manual:

> It may be useful to let the ADC convert one or more channels without reading the data each

time (if there is an analog watchdog for instance). For that, the DMA must be disabled

(DMA = 0) and the EOC bit must be set at the end of a sequence only (EOCS = 0). In this

configuration, overrun detection is disabled.

[AAbed.1]

I did ADC convert Continuously mode. But I could not get any change until I press reset button to change frequency so the code can not follow the change of variable resistor's voltage

[TDK]

How are you initializing and starting ADC conversions?

[AAbed.1]

I initialized ADC by using continuous mode.

[Laurent Ca...]

Dear @AAbed.1​ 

Do you have still this problem to solve?

And just in case, if not, do not hesitate to share the final solution you found.

Best regards

Laurent Ca...

==

Dear 

[Laurent Ca...]

Dear @AAbed.1​ 

I guess you don't have to solve this problem anymore, therefore I consider this thread closed.

If not, feel free to reopen it by posting an answer.

Best regards

Laurent Ca...

[AAbed.1 · Accepted solution]

Thanks

I solved it by using single mode ADC.