How to properly change input capture configuration from TPM2_CH0 to TPM3_CH2 in i.MX93 SDK example?

[Manjunathb]

Hello NXP Community,

I'm working on the input capture demo example from the MCUXpresso SDK for i.MX93. By default, the example uses TPM2 Channel 0 (TPM2_CH0) for input capture. I would like to switch this to use TPM3 Channel 2 (TPM3_CH2) instead.

Could you please clarify what all changes need to be made in the SDK code and configuration files to successfully switch the input capture source from TPM2_CH0 to TPM3_CH2?

Here’s what I’ve identified so far:

1. Update DEMO_TPM_BASEADDR from TPM2 to TPM3.

2. Update BOARD_TPM_INPUT_CAPTURE_CHANNEL from kTPM_Chnl_0 to kTPM_Chnl_2.

3. Change the IRQ handler from TPM2_IRQHandler to TPM3_IRQHandler.

4. Update TPM_INTERRUPT_NUMBER accordingly.

5. Pin Muxing: I believe the pin for TPM3_CH2 needs to be correctly muxed via IOMUXC. What pin should I use on the i.MX93 EVK or custom board for TPM3_CH2 input?

Are there any additional steps, especially related to:

• Clock source setup for TPM3?

• Enabling TPM3 module in RDC or CCM?

• Input signal routing (XBAR or SAI to TPM)?

• Anything specific to i.MX93 SoC or SDK behavior?

Any guidance, especially with respect to clock trees and signal routing for TPM3_CH2, would be highly appreciated.

Thank you!

i.MX93EVK 

[Manuel_Salas]

Hello @Manjunathb 

I hope you are doing very well.

I am not sure what SDK version are you using. I tested with the SDK_25_03_00_MCIMX93-EVK.

The changes are:

app.h

/*
 * Copyright 2022 NXP
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */
#ifndef _APP_H_
#define _APP_H_

/*******************************************************************************
 * Definitions
 ******************************************************************************/
/*${macro:start}*/
/* define instance */
#define DEMO_TPM_BASEADDR TPM3

/* Interrupt to enable and flag to read; depends on the TPM channel used */
#define BOARD_TPM_INPUT_CAPTURE_CHANNEL kTPM_Chnl_2

/* Interrupt to enable and flag to read; depends on the TPM channel used */
#define TPM_CHANNEL_INTERRUPT_ENABLE kTPM_Chnl2InterruptEnable
#define TPM_CHANNEL_FLAG             kTPM_Chnl2Flag

/* Interrupt number and interrupt handler for the TPM instance used */
#define TPM_INTERRUPT_NUMBER      TPM3_IRQn
#define TPM_INPUT_CAPTURE_HANDLER TPM3_IRQHandler

/* Get source clock for TPM driver */
#define LPTPM_CLOCK_ROOT kCLOCK_Root_Tpm3
#define LPTPM_CLOCK_GATE kCLOCK_Tpm3
#define TPM_SOURCE_CLOCK CLOCK_GetIpFreq(LPTPM_CLOCK_ROOT)
/*${macro:end}*/


//#define WAKEUP kCLOCK_Root_BusWakeup

/*******************************************************************************
 * Prototypes
 ******************************************************************************/
/*${prototype:start}*/
void BOARD_InitHardware(void);
/*${prototype:end}*/

#endif /* _APP_H_ */

pin_mux.c

void BOARD_InitPins(void) {                                /*!< Function assigned for the core: undefined[cm33] */
    IOMUXC_SetPinMux(IOMUXC_PAD_GPIO_IO12__TPM3_CH2, 0U);
    IOMUXC_SetPinMux(IOMUXC_PAD_UART2_RXD__LPUART2_RX, 0U);
    IOMUXC_SetPinMux(IOMUXC_PAD_UART2_TXD__LPUART2_TX, 0U);

    IOMUXC_SetPinConfig(IOMUXC_PAD_GPIO_IO12__TPM3_CH2, 
                        IOMUXC_PAD_DSE(15U));
    IOMUXC_SetPinConfig(IOMUXC_PAD_UART2_RXD__LPUART2_RX, 
                        IOMUXC_PAD_PD_MASK);
    IOMUXC_SetPinConfig(IOMUXC_PAD_UART2_TXD__LPUART2_TX, 
                        IOMUXC_PAD_DSE(15U));
}

According to the reference manual, the Pad that you must set to use as TPM3_CH2 is GPIO_IO12:

That pad is exposed in the J1001 in EVK:

Best regards,

Salas.

[Manjunathb]

@Manuel_Salas
Thank you for your response