Two GPT captures

adde_ado — Fri, 10 Dec 2021 08:38:52 GMT

Hi,

I'm using GPT to capture data from two different ICs.

The pins that I'm using are:

IOMUXC_SAI3_RXFS_GPT1_CAPTURE1 and IOMUXC_SAI3_TXFS_GPT1_CAPTURE2

The first one capturing (IOMUXC_SAI3_RXFS_GPT1_CAPTURE1) is working fine but the second one (IOMUXC_SAI3_TXFS_GPT1_CAPTURE2) is NOT (not getting any irq).

I have check with oscilloscope and the data is coming at IOMUXC_SAI3_TXFS_GPT1_CAPTURE2.

These are mine definition for firs capture that works fine:

#define EM_GPT_IRQn GPT1_IRQn
#define EM_GPT_BASE GPT1
/* GPT channel used for input capture */
#define EM_BOARD_GPT_INPUT_CAPTURE_CHANNEL kGPT_InputCapture_Channel1
/* Interrupt to enable and flag to read; depends on the GPT channel used */
#define EM_GPT_CAPTURE_IRQHandler GPT1_IRQHandler
#define EM_BOARD_GPT_CHANNEL_INTERRUPT_ENABLE kGPT_InputCapture1InterruptEnable
#define EM_BOARD_GPT_CHANNEL_FLAG kGPT_InputCapture1Flag

I'm not sure how definition shall look like for second capture!

This is how it looks like now. Not sure if this is correct.

#define RF_GPT_IRQn GPT2_IRQn
#define RF_GPT_BASE GPT2
/* GPT channel used for input capture */
#define RF_BOARD_GPT_INPUT_CAPTURE_CHANNEL kGPT_InputCapture_Channel1
/* Interrupt to enable and flag to read; depends on the GPT channel used */
#define RF_GPT_CAPTURE_IRQHandler GPT2_IRQHandler
#define RF_BOARD_GPT_CHANNEL_INTERRUPT_ENABLE kGPT_InputCapture1InterruptEnable
#define RF_BOARD_GPT_CHANNEL_FLAG kGPT_InputCapture1Flag

Is there any example that shows how to use 2 captures or how to configure GPT for "SAI3_TXFS_GPT1_CAPTURE2"?

Hope someone can help me with this.

Best regards,

Adde

Re: Two GPT captures

igorpadykov — Wed, 15 Dec 2021 06:34:06 GMT

Hi Adde

>I'm not sure how definition shall look like for second capture!
>This is how it looks like now. Not sure if this is correct.
>#define RF_GPT_IRQn GPT2_IRQn
>#define RF_GPT_BASE GPT2

for GPT2 CAPTURE signals are not routed externally as described in sect.8.1.1.1 Muxing Options

i.MX 8M Dual/8M QuadLite/8M Quad Applications Processors Reference Manual

So such capture functionality is possible only with GPT1.

Best regards
igor

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