How to use FTM to trigger DMA request using FRDM K64?

oliviachristyva — Fri, 10 Feb 2017 11:51:06 GMT

Hi guys,

I am reading audio files from SD card in k60 and putting it to the DAC out . From there i gave it to the G510 GSM audio pins and i hear the audio while making a call to the G510. It is successfully working .But now I need to make the same code using FRDM K64. and the code is not working . I think the issue is with FTM which generate signal to trigger DMA request.

This is my FTM code . It is working for K60. what changes should I make so that it works with FRDM K64.

bus clock is 50mhz for k60 and 60 mhz for frdm k64

void Init_FTM2(void)
{
SIM_SCGC3 |= SIM_SCGC3_FTM2_MASK; // enable clock to FTM2
SIM_SCGC5 |= SIM_SCGC5_PORTB_MASK; // enable clock to PORTB

FTM2_C1SC |= FTM_CnSC_MSB_MASK | FTM_CnSC_ELSB_MASK | FTM_CnSC_CHIE_MASK | FTM_CnSC_DMA_MASK ; // PWM, true high pulses - generates DMA req
FTM2_MOD = (uint_32)((uint_32)BSP_BUS_CLOCK/(SAMPLERATE)); // 50MHz / 16000 = 3125.
FTM2_C0V = 1100; // any initial random value
FTM2_C1V = 50; // this value does NOT change -it is used to generate audio reload DMA request
// this starts the timer
FTM2_SC |= FTM_SC_CLKS(0x01) | FTM_SC_PS(0x00) ; // Bus Clock, divide-by-1
}

Please help

Thanks and Regards,

Olivia

Re: How to use FTM to trigger DMA request using FRDM K64?

xiangjun_rong — Mon, 13 Feb 2017 06:45:49 GMT

Hi, Olivia,

I think the FTM module for both K60 and K64 is the same, so the FTM code in above function is right, you have to check the other code.

Hope it can help you

Xiangjun Rong

topic Re: How to use FTM to trigger DMA request using FRDM K64? in Kinetis Microcontrollers

How to use FTM to trigger DMA request using FRDM K64?

Re: How to use FTM to trigger DMA request using FRDM K64?