wrong ADC DMA Continous conversion data order

[Gaston]

Hi,

I cannot understand acquired ADC data order using this configuration on a STM32G030C6 device:

I want to acquire 9 input channels + 2 internal channels (Temperature Sensor + Vbat). Continuous mode w/ Circular DMA

Here's my Initialization routine

static uint32_t adc_values[11];

HAL_ADCEx_Calibration_Start(&hadc1);
// DMA continous requests: ENABLED
HAL_ADC_Start_DMA(&hadc1, adc_values, 11);

Everything works as expected except the channels order.

• adc_values[0] ---> OK
• adc_values[1] ---> OK
• adc_values[2] ---> OK
• adc_values[3] ---> OK
• adc_values[4] ---> OK
• adc_values[5] ---> KO This should be (afaik) the internal temperature sensor channel but I see the IN8 adc value.
• adc_values[6] ---> KO This should be (afaik) the IN8 channel but I see the IN9 channel.
• adc_values[7] ---> KO Does not match either.
• adc_values[8] ---> KO Does not match either.
• adc_values[9] ---> KO Does not match either.
• adc_values[10] ---> KO Does not match either.

Does anyone know what the problem is?
I'm not able to find any example with similar configuration.

Thanks in advance,
Gaston

[AScha.3]

Hi,

the sequence depends on the Rank numbers - what you set ? 

On every Rank you can choose, which channel is it , to convert. So you decide about the sequence !

see:

I set 3 conversions, but 2. is temp channel...because i choose it for Rank 2.

[Gaston]

Thank you for replying. I know this but I see no way to select Rank numbers in this ADC configuration. Notes that Sequencer is set to not fully configurable as I need IN15 and IN16 input channels.

[AScha.3 · Accepted solution]

Oh, ok , on G030 ...

So check, whats the "ch numbers" ...this is the sequence then.

see rm...

[Gaston]

Blessed RM 🙏 I should have checked it before raising the question. Now it makes sense.

Thank you very much AScha.3!

Gaston