PWM in FRDMK64

deeptimoodliar — Tue, 16 Feb 2016 06:26:17 GMT

I am new to PWM using FTM. I have worked a bit on KSDK 1.3.0 and FRDMK64F board.

In K64 certain gpio pins can be configured as dedicated PWM pins as per manual.

However, there is no specific example of PWM generation on a pin with a specific period and duty cycle available in KSDK 1.3.0.

In demo_apps there is bubble_level_ftm, but it is not using the PWM pin and neither generating a prefixed duty cycle.

I just want to generate pulses on PWM pin of a desired period and duty cycle.

I thought the following flow of functions was good enough:

hardware_init();

OSA_Init();

configure_ftm_pins(FTM0_IDX);

CLOCK_SYS_EnableFtmClock(BOARD_FTM_INSTANCE);

	ftmParam.mode	= kFtmEdgeAlignedPWM;
	ftmParam.edgeMode	= kFtmLowTrue;
	ftmParam.uFrequencyHZ	= PWM_FREQ_HZ;
	ftmParam.uDutyCyclePercent	= 50;
	ftmParam.uFirstEdgeDelayPercent = 0;

	// Enable FTM module and generate PWM
	memset(&ftmInfo, 0, sizeof(ftmInfo));
	ftmInfo.syncMethod = kFtmUseSoftwareTrig;

	FTM_DRV_Init(BOARD_FTM_INSTANCE, &ftmInfo);
	FTM_DRV_SetClock(BOARD_FTM_INSTANCE, kClock_source_FTM_SystemClk, kFtmDividedBy1);
	FTM_DRV_PwmStart(BOARD_FTM_INSTANCE, &ftmParam, BOARD_FTM_CHANNEL);

But this is not working. Kindly let me know where I am wrong.

Re: PWM in FRDMK64

ZhangJennie — Tue, 16 Feb 2016 09:44:34 GMT

Hi Deepti,

please refer if this article with demo code can help you:

Rainbow color using FTM PWM with KSDK 1.3

Have a great day,
Jennie Zhang

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PWM in FRDMK64

Re: PWM in FRDMK64