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PWM with FTM1 and channel 1 : The program hangs. Works fine for FTM2 and channel 3

Question asked by Mohan Gandhi Vinnakota on Mar 23, 2020
Latest reply on Mar 24, 2020 by Sebastián Del Río

Hi,

I am working with FRDM-KE06Z custom board. I have imported ftm_simple_pwm program in to my MCUXpresso IDE and started working on it. 

In this code I see that they are using FTM2 and channel 3. And FTM2_IRQn. Like below.

 

#define BOARD_FTM_BASEADDR FTM2
#define BOARD_FTM_CHANNEL kFTM_Chnl_3


#define FTM_INTERRUPT_NUMBER FTM2_IRQn
#define FTM_LED_HANDLER FTM2_IRQHandler


#define FTM_CHANNEL_INTERRUPT_ENABLE kFTM_Chnl3InterruptEnable
#define FTM_CHANNEL_FLAG kFTM_Chnl3Flag


#define FTM_SOURCE_CLOCK CLOCK_GetFreq(kCLOCK_TimerClk)

 

and in the main function in the 

BOARD_InitPins();

inside BOARD_InitPins(); function they are using corresponsding pin. 

PORT_SetPinSelect(kPORT_FTM2CH3, kPORT_FTM2_CH3_PTG5);

When I debug everything is fine.

 

 

My question is 

I wanted to use FTM1 and Channel 1. Since I want to use FTM1 hence I am using FTM1_IRQn. Like below.

 

#define BOARD_FTM_BASEADDR FTM1
#define BOARD_FTM_CHANNEL kFTM_Chnl_1
#define FTM_INTERRUPT_NUMBER FTM1_IRQn
#define FTM_LED_HANDLER FTM1_IRQHandler
#define FTM_CHANNEL_INTERRUPT_ENABLE kFTM_Chnl1InterruptEnable
#define FTM_CHANNEL_FLAG kFTM_Chnl1Flag

 

Also I changed the pin in BOARD_InitPins();  function as below.

PORT_SetPinSelect(kPORT_FTM1CH1, kPORT_FTM1_CH1_PTC5);

When I debug this code my program is hanging. When I made step by step debug I see that when execution goes to the  FTM_Init(BOARD_FTM_BASEADDR, &ftmInfo); function, when execution goes to 

base->MODE = FTM_MODE_FAULTM(config->faultMode) | FTM_MODE_FTMEN_MASK | FTM_MODE_WPDIS_MASK;

 

program is hanging all the times.

 

When I use FTM2 with channel 3 and FTM"_IRQn then it is fine. The problem is only when I use FTM1 and channel1 and FTM1_IRQn.

I should use FTM1 since my prototype uses  PTC5 for PWM.

Can someone tell me the problem here?. Thank you.

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