topic Re: S32k144 DMA Pulse Counting Interrupt in S32K

S32k144 DMA Pulse Counting Interrupt

Adhi_11 — Sun, 27 Nov 2022 16:59:53 GMT

Hello i am a student and for my project i needed a 4-CH pulse counter which i used DMA based pulse counting. My code was working without interrupt, now i enabled the interrupt after one major loop and theres no response. KINDLY check what is wrong. I also observed that the MCU has problems in handling multiple interrupt. What should i do in this situation.

Re: S32k144 DMA Pulse Counting Interrupt

Robin_Shen — Mon, 28 Nov 2022 08:28:09 GMT

Hi Adhi_11,

Seems that you are refer to the S32K_Pulse_Count_via_eDMA example in AN5258SW.
Please set the INTMAJOR bit in the TCDn_CSR register by refer:
DMA->TCD[0].CSR |= DMA_TCD_CSR_INTMAJOR_MASK;

From which pin are you counting the external pulse?(PTA8 or PTB8 or PTC8 or PTD8?)
Is the number of pulses input through this pin enough for CITER to reach 0?

Best Regards,
Robin
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Re: S32k144 DMA Pulse Counting Interrupt

Adhi_11 — Mon, 28 Nov 2022 21:58:59 GMT

Hi Robin,

Yes, i referred the same documentation. i modified my code like you commented. I used now a 10khz PWM signal generated using PTD0 and used it in PTC8 and then PTD8. But the result is still 0. Im not sure if the number of pulses are enough for CITER to be 0. What needs to be done here to fix this issue. I needed 4xPWM counters implemented to count 4xexternal pulses

Re: S32k144 DMA Pulse Counting Interrupt

Robin_Shen — Tue, 29 Nov 2022 08:19:39 GMT

Connect PTD0(10kHz PWM) to PTC8 or PTD8 will trigger DMA2_IRQHandler and DMA3_IRQHandler.

Re: S32k144 DMA Pulse Counting Interrupt

Adhi_11 — Tue, 29 Nov 2022 12:02:28 GMT

Yes, the interrupt triggered like you said. But the pulse counting did not occur, the output is still 0

Re: S32k144 DMA Pulse Counting Interrupt

Robin_Shen — Wed, 30 Nov 2022 01:27:39 GMT

Why you read the frequency_chx in DMA interrupt handler? The NOTE said: You can read the eDMA channel counter at any time in your application before the major iteration count is exhausted (when CITER reaches 0).

Re: S32k144 DMA Pulse Counting Interrupt

Adhi_11 — Tue, 31 Jan 2023 19:02:24 GMT

Hi Robin,

i needed to adopt this example for my S32k144 64pin self made board. How do i select the trigger source. Example uses PTA8, PTB8, PTC8, PTD8.. etc for channel source 49,50,51,52 what should be channel number if i want to use PTA12, PTE3, PTD2, PTC7. Where do i find this information