topic Re: Potentiometer Live Values via ADC in S32K

Potentiometer Live Values via ADC

ishoboiM — Thu, 29 May 2025 12:17:25 GMT

Hello, we were wondering whether I could have a project/code where we can see the Live expression of ADC values of the Potentiometer in S32K3X4EVB-T172, we are trying to do a few ADC projects and didnt find any luck in example projects as well as online community.

Re: Potentiometer Live Values via ADC

PavelL — Thu, 29 May 2025 14:33:30 GMT

Hello @ishoboiM ,

please check out this S32K knowledge base article - [RTD400 LLD]K344 ADC SW+HW trigger - NXP Community

Best regards,

Pavel

Re: Potentiometer Live Values via ADC

ZooTech — Fri, 30 May 2025 10:25:13 GMT

We have already tried these methods, but we are not clear about the values at the output. When we manually measure and calculate the voltage at the terminals of the potentiometer, we obtain a value between 0 and 16,383. However, the output, represented by the data variable, is giving us random values between 2,000 and 6,000, which change randomly even before we adjust the input in rerun mode.

Re: Potentiometer Live Values via ADC

PavelL — Fri, 30 May 2025 11:05:14 GMT

Hello @ZooTech ,

What S32K3 RTD version do you use?

Could you share your project as a zip file?

Best regards,

Pavel

Re: Potentiometer Live Values via ADC

ishoboiM — Fri, 30 May 2025 12:31:41 GMT

Hello Pavel,

We have tried from both 3.0.0 and 5.0.0 RTD versions,

In the 5.0.0 version the error we are getting is that make is not found in path and it expected a 4.0.0 rtd in manage sdks folder

Whereas coming to the system with the 3.0.0 rtd in @ZooTech 's system, We tried the example project Adc_sar_bctu_Ip_example code instead and we got random values as a result as she explained in her query.

Attached file down below, Apologies for any misunderstanding and thanks for the reply

Re: Potentiometer Live Values via ADC

PavelL — Fri, 30 May 2025 13:57:15 GMT

Hello @ishoboiM ,

Let me share a comment to RTD installation first.

Having multiple RTD versions installed within a single S32 Design Studio environment is not recommended. My colleagues and I follow a good practice of naming the installation folder after the RTD version. For example:
C:\NXP\S32DS.3.5_RTD400
with a corresponding workspace:
C:\Users\...\workspaceS32DS.3.5_RTD400

I will do my best to check your project on my T172 board next week.

Best regards,

Pavel

Re: Potentiometer Live Values via ADC

ishoboiM — Tue, 03 Jun 2025 06:40:00 GMT

Hello Pavel,

Thank you for your response, will make sure to follow that practice

Thank you

Re: Potentiometer Live Values via ADC

PavelL — Fri, 13 Jun 2025 12:56:18 GMT

Hello @ishoboiM ,

I apologize for delayed answer.

I found only two issues in your project:

Adc_Sar_Ip - Adc Hardware Unit shall be ADC1
Main.c:
missing - extern void Adc_Sar_1_Isr(void);
ADC0 shall be ADC1 - IntCtrl_Ip_InstallHandler(ADC1_IRQn, Adc_Sar_1_Isr, NULL_PTR);
ADC0 shall be ADC1 - IntCtrl_Ip_EnableIrq(ADC1_IRQn);

I created an example for you. Data is printed out by semihosting. Feel free to use my RTD300 ADC example.

Bets regards,

Pavel