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ADC channels error

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ADC channels error

‎03-02-2017 12:34 PM
1,233 Views
lohrsistemas
Contributor IV

I'm using multiple AD channels of the s32k144 MCU, but only one of them reads. Below is my code. What can I do to resolve this?

                //ADC1_SE1
                /* Configure the ADC converter    -    See ADC component for the configuration details */
                ADC_DRV_ConfigConverter(ADC_INSTANCE1, &adConv2_ConvConfig0);
                /* Configure ADC channel and software trigger a conversion */
                ADC_DRV_ConfigChan(ADC_INSTANCE1, ADC_CHN1, &adConv2_ChnConfig1);
                /* Wait for the conversion to be done */
                ADC_DRV_WaitConvDone(ADC_INSTANCE1);
                /* Store the channel result into a local variable */
                ADC_DRV_GetChanResult(ADC_INSTANCE1, ADC_CHN1, &valorAD);
              

               //ADC1_SE2
                /* Configure the ADC converter    -    See ADC component for the configuration details */
                ADC_DRV_ConfigConverter(ADC_INSTANCE1, &adConv2_ConvConfig0);
                /* Configure ADC channel and software trigger a conversion */
                ADC_DRV_ConfigChan(ADC_INSTANCE1, ADC_CHN2, &adConv2_ChnConfig2);
                /* Wait for the conversion to be done */
                ADC_DRV_WaitConvDone(ADC_INSTANCE1);
                /* Store the channel result into a local variable */
                ADC_DRV_GetChanResult(ADC_INSTANCE1, ADC_CHN2, &valorAD);

               //ADC1_SE0
                /* Configure the ADC converter    -    See ADC component for the configuration details */
                ADC_DRV_ConfigConverter(ADC_INSTANCE1, &adConv2_ConvConfig0);
                /* Configure ADC channel and software trigger a conversion */
                ADC_DRV_ConfigChan(ADC_INSTANCE1, ADC_CHN0, &adConv2_ChnConfig0);
                /* Wait for the conversion to be done */
                ADC_DRV_WaitConvDone(ADC_INSTANCE1);
                /* Store the channel result into a local variable */
                ADC_DRV_GetChanResult(ADC_INSTANCE1, ADC_CHN0, &valorAD);

I only can read valorAD in ADC1_SE0...

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1 Reply

‎02-27-2019 05:43 AM
825 Views
dianabatrlova
NXP TechSupport
NXP TechSupport

Hello,

I would like to recommend you to look at S32K1xx ADC guidelines, spec and configuration

https://www.nxp.com/docs/en/application-note/AN12217.pdf 

Only SC1A can be used for software trigger mode.

Instead of ADC_CHNx should be always '0'.

For example, see the configuration below:

/* Configure ADC channel and software trigger a conversion */
ADC_DRV_ConfigChan(ADC_INSTANCE, 0U, &adConv1_ChnConfig0);

There is a possibility to choose the input (SC1A[ADCH]). 

pastedImage_11.png

You can refer to adc_swtrigger_S32k144 SDK example.

I hope it helps you.

Best Regards,

Diana

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