topic Re: s32k144 PDB ad ping-pong sampling in S32K

s32k144 PDB ad ping-pong sampling

jiangbolwj — Thu, 03 Aug 2017 09:53:20 GMT

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

Re: s32k144 PDB ad ping-pong sampling

ovidiualexandru — Thu, 03 Aug 2017 14:53:06 GMT

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

Re: s32k144 PDB ad ping-pong sampling

jiangbolwj — Fri, 04 Aug 2017 10:23:29 GMT

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

Re: s32k144 PDB ad ping-pong sampling

ovidiualexandru — Mon, 07 Aug 2017 10:51:16 GMT

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.

Re: s32k144 PDB ad ping-pong sampling

jiangbolwj — Tue, 08 Aug 2017 02:19:08 GMT

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

Re: s32k144 PDB ad ping-pong sampling

dragos-ionutgal — Fri, 18 Aug 2017 09:18:00 GMT

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.

Re: s32k144 PDB ad ping-pong sampling

gumpforrest — Tue, 21 Aug 2018 02:55:33 GMT

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.