topic Re: How to route QTMR output via XBAR to pin? in i.MX RT Crossover MCUs

How to route QTMR output via XBAR to pin?

bikenomad — Tue, 11 Oct 2022 23:32:56 GMT

I have a board on which I have to produce a simple PWM waveform on pin GPIO_AD_B1_09 on an MIMRT1021DAG5A.

This requires going through the XBAR.

I have successfully routed another pin through the XBAR to a QTMR input, but can't see any output on this pin with the following PWM code:

// Generating 22kHz PWM using TMR1 channel 1 to pin GPIO_AD_B1_09
// Want to connect TMR1.output1 to pin GPIO_AD_B1_09
// but need to do it through the XBAR
#define FAN_PWM_TIMER TMR1
#define FAN_PWM_TIMER_CHANNEL kQTMR_Channel_1
#define FAN_PWM_FREQUENCY 22000UL
#define FAN_TIMER_DIVIDED_CLOCK 1953125UL

void fan_pwm_initialize(void)
{
 CLOCK_EnableClock(kCLOCK_Iomuxc);
 CLOCK_EnableClock(kCLOCK_Xbar1);
 XBARA_Init(XBARA);

 IOMUXC_SetPinMux(IOMUXC_GPIO_AD_B1_09_XBAR1_INOUT13, 0);
 IOMUXC_SetPinConfig(IOMUXC_GPIO_AD_B1_09_XBAR1_INOUT13, 0x1080);
 IOMUXC_GPR->GPR6 = (IOMUXC_GPR->GPR6 & (~(IOMUXC_GPR_GPR6_IOMUXC_XBAR_DIR_SEL_13_MASK))) |
 IOMUXC_GPR_GPR6_IOMUXC_XBAR_DIR_SEL_13(0x01U);

 XBARA_SetSignalsConnection(XBARA, kXBARA1_InputQtimer1Tmr1, kXBARA1_OutputIomuxXbarInout13);

 qtmr_config_t qtmrConfig = {
.debugMode = kQTMR_RunNormalInDebug,
.enableExternalForce = false,
.enableMasterMode = false,
.faultFilterCount = 0,
.faultFilterPeriod = 0,
.primarySource = kQTMR_ClockDivide_64, // 1.953 MHz clock
.secondarySource = kQTMR_Counter0InputPin,
};

 QTMR_Init(FAN_PWM_TIMER, FAN_PWM_TIMER_CHANNEL, &qtmrConfig);
 // start at 50% duty cycle
 QTMR_SetupPwm(FAN_PWM_TIMER, FAN_PWM_TIMER_CHANNEL, FAN_PWM_FREQUENCY, 50, false, FAN_TIMER_DIVIDED_CLOCK);
 QTMR_StartTimer(FAN_PWM_TIMER, FAN_PWM_TIMER_CHANNEL, kQTMR_PriSrcRiseEdge);
};

How can I make this work? I have looked at the TMR1 registers in a debugger and they look OK.

Re: How to route QTMR output via XBAR to pin?

jeremyzhou — Wed, 12 Oct 2022 07:43:21 GMT

Hi @bikenomad ，
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
After having a brief review of the above code, I've not found something wrong, so I guess the issue may be related to hardware.
Have a great day,
TIC

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Re: How to route QTMR output via XBAR to pin?

bikenomad — Fri, 14 Oct 2022 21:18:36 GMT

I have tried two EVK boards with the same result. My EVK boards are version A3, and I have checked to make sure that the pin GPIO_AD_B1_09 is in fact connected to J17/1.

Could you look a bit more closely?

Re: How to route QTMR output via XBAR to pin?

jeremyzhou — Mon, 17 Oct 2022 01:59:13 GMT

Hi，
Thanks for your reply.
Whether you can upload the complete demo project that is able to replicate the phenomenon.
Have a great day,
TIC

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Re: How to route QTMR output via XBAR to pin?

bikenomad — Mon, 17 Oct 2022 18:01:22 GMT

Project is attached.

Re: How to route QTMR output via XBAR to pin?

bikenomad — Thu, 20 Oct 2022 00:08:25 GMT

I uploaded the project. Do you need any more information?

Re: How to route QTMR output via XBAR to pin?

jeremyzhou — Thu, 20 Oct 2022 02:42:08 GMT

Hi，
Thanks for your reply.
I already replicate the phenomenon on MIMXRT1020-EVK, and now I'm still working on it.
Have a great day,
TIC

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Re: How to route QTMR output via XBAR to pin?

bikenomad — Mon, 24 Oct 2022 20:46:21 GMT

Any progress?

Re: How to route QTMR output via XBAR to pin?

jeremyzhou — Tue, 25 Oct 2022 07:52:47 GMT

Hi，
Sorry for replying late.
I created a new demo project that bases on the evkmimxrt1020_qtmr_inputcapture_outputpwm, then add the XBAR feature, now I can output the PWM via the GPIO_AD_B1_09.
Please check the attachment.
Have a great day,
TIC

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