s32k144 PDB ad ping-pong sampling

[jiangbolwj]

i used pdb to ty ad ping-pong sampling but not ok, someone use PE to test Ad ping-pong ok ? can you give me a example used PE,i

[ovidiualexandru]

Hi, the S32 SDK contains examples including PDB triggering of adc. One such example is under examples\S32K144\driver_examples\analog\adc_hwtrigger

[jiangbolwj]

i use this example but only can sample one AD channel ,i did not know where is wrong could you help me looking 
thank you 
job

[ovidiualexandru]

Seems that are a few issues with PDB configuration in the application:

 - for the first PDB pretrigger (channel 0, pretrigger 0) should not have Back to Back enabled (preTriggerBackToBackEnable should be false in pdly1_AdcTrigInitConfig0).

 - there is only one PDB pretrigger configured. There should be as many PDB pretriggers configures as ADC control channels (in this case, 2)

 - configuring PDB modulus and pretrigger delay is not necessary for Back to Back operation.

I will follow up with an updated application if needed.

[jiangbolwj]

ok,could you give me a updated application, first using pdb,i not very clear at this ,thank you

[dragos-ionutgal]

Hi,

I have updated your code a bit.

You had ADC set to continuous conversion and pdb channel 0 set to back to back.

Please tell me if this fixes your problem.

Regards,

Dragos.

[gumpforrest]

Hi !

I haved tried this Demo, I do change some codes as follow :

In Adc Initiation: (uncommon codes)

ADC_DRV_ConfigChan(ADC_INSTANCE, 0UL, &adConv1_ChnConfig0);

ADC_DRV_ConfigChan(ADC_INSTANCE, 1UL, &adConv1_ChnConfig0);

ADC_DRV_ConfigChan(ADC_INSTANCE, 2UL, &adConv1_ChnConfig0);

ADC_DRV_ConfigChan(ADC_INSTANCE, 3UL, &adConv1_ChnConfig0);

In PDB Initiation:

PDB_DRV_ConfigAdcPreTrigger(PDB_INSTANCE, 0, &pdly1_AdcTrigInitConfig0);

PDB_DRV_ConfigAdcPreTrigger(PDB_INSTANCE, 0, &pdly1_AdcTrigInitConfig1);

PDB_DRV_ConfigAdcPreTrigger(PDB_INSTANCE, 0, &pdly1_AdcTrigInitConfig2);

PDB_DRV_ConfigAdcPreTrigger(PDB_INSTANCE, 0, &pdly1_AdcTrigInitConfig3);

In ADC_IRQHandler:

ADC_DRV_GetChanResult(ADC_INSTANCE, 0U, (uint16_t *)&adcRawValue);

ADC_DRV_GetChanResult(ADC_INSTANCE, 1U, (uint16_t *)&adcRawValue1);

ADC_DRV_GetChanResult(ADC_INSTANCE, 2U, (uint16_t *)&adcRawValue2);

ADC_DRV_GetChanResult(ADC_INSTANCE, 3U, (uint16_t *)&adcRawValue3);

I am confised why adcRawValue is less than other convertion results like adcRawValue1/adcRawValue2/adcRawValue3  ?

Above all.

I do want a demo which uses ADC0, PDB0, ADC1, PDB1 to build a ring

so that in my applications, except understanding the principle of this ring,

I do only configure Channals.