How to use multiple inputs/Channels of ADC S32K148-EVB

[Kallappa]

Hi,

I am working on S32K148-EVB, where i am able use the Single channel/input from sensor using ADC0 (example code adc_swtrigger_s32k148 from NXM community) and now i want to read multiple sensor data using ADC0 with different channels/inputs for this i have tried this by configuring ADC converter with one more ADC channel  and the result is

1. Pin PTC14 --> channel12 is reading data but it is constant (This configured in NXP ex code)
2.  One more pin PTC3 --> channel11 is not reading data from sensor(This configured by me in Example code)
   
   so how i can read the multiple channels kindly let me know 
   code i am using is attached here for reference
   
   and i have one more query here
   * with the NXM example code if i want to read the ADC input with other pins how i can achieve this(As i have tried to change channel number in macro but didn't worked for me)
   
   
   
   Thanks
   Kallappa

[PetrS]

Hi,

use HW triggered mode. You can find demo example for it in S32DS too, just modify it and add channels you need.
You can also refer to https://community.nxp.com/t5/S32K-Knowledge-Base/Example-S32K144-PDB-ADC-DMA-S32DS-ARM-2018-R1/ta-p/...

BR, Petr

[Kallappa]

Hi PetrS,

Thank you for your response, i will check with HW triggered mode

and the link you shared for reference, from that i have downloaded the zip file but it is empty, please share me the file again if possible it will be really helpful

Best regards,
Kallappa

[Kallappa]

Hi PetrS,

Can you please tell about this,

* with the NXM example code if i want to read the ADC input with other pins how i can achieve this(As i have tried to change channel number in macro but didn't worked for me)
in example code : As ADC data is reading from input/channel-12 from ADC0 i.e PTC14 

so if want to read ADC data from some other pin like PTC19 or any other

Please let me about this 

Thanks & regards,
Kallappa

[PetrS]

Hi,

what is NXM example?
If checking SDK adc_swtrigegr_s32k148 demo example chanell 28 is converted (PTC28 pin, connected with potentiometer on EVB). So value 0x2C is written to SC1A register. Refer to SC1A[ADCH]  description in the RM.

BR, Petr

[PetrS]

Hi,

strange, I see it is not empty when download it.
Anyway see attached.

BR, Petr

[Kallappa]

Hi PetrS,

Thanks for sharing the code,

I am able to read the analog voltage from deferent pins at a time with adc_hwtrigegr_s32k148 demo example(1 sensor output on different ADC0 channel PTC14 or PTC19 one at a time) but when i tried to read two different sensor output on ADC0 channel PTC14(Sensor1) and PTC19(Sensor2) i am not getting sensor data on any of the pin i have attached code here, kindly let me know where i am doing wrong 

and the code shared (S32K144_PDB_ADC_DMA_sdk_rtm_300.zip) is using DMA, Timers etc so it is quite difficult understand so please let me what is problem here

Thanks,
Kallappa

[Kallappa]

Hi PetrS,

Actually i am trying this ADC0 with multi channel in S32K148,
and now i am porting S32K144_PDB_ADC_DMA_sdk_rtm_300 and i will check how this works


Thanks,
Kallappa