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K22 Clock Setup

Question asked by An Bui on Feb 2, 2017
Latest reply on Feb 6, 2017 by An Bui

I have 16MHz external crystal for K22.

I am using KSDK v2.1.

 

I've configured the clock to run in FEE:

 

void BootClockRUN_FEE(void)
{

const sim_clock_config_t simConfig = {
      .pllFllSel = 0U, .er32kSrc = 3U, .clkdiv1 = 0x01340000U,
};

 

CLOCK_SetSimSafeDivs();

 

BOARD_InitOsc0();

 

CLOCK_BootToFeeMode(kMCG_OscselOsc, 4U, kMCG_Dmx32Default, kMCG_DrsMidHigh, BOARD_FllStableDelay);

 

CLOCK_SetInternalRefClkConfig(kMCG_IrclkEnable, kMCG_IrcSlow, 0U);

 

CLOCK_SetSimConfig(&simConfig);

 

SystemCoreClock = 80000000U;

}

 

After initializing the Clock management, I try to use PTC3 pin to scope the output of the flash clock to verify the SystemCoreClock is correct.

#define SIM_SCGC5_REG(base) ((base)->SCGC5)
#define SIM_SOPT2_REG(base) ((base)->SOPT2)
#define PORT_PCR_REG(base,index) ((base)->PCR[index])

#define SIM_SOPT2 SIM_SOPT2_REG(SIM)
#define SIM_SCGC5 SIM_SCGC5_REG(SIM)
#define PORTC_PCR3 PORT_PCR_REG(PORTC,3)
#define PORTC_PCR4 PORT_PCR_REG(PORTC,4)

 

SIM_SCGC5|=0x800;
PORTC_PCR3&=~(0x700);
PORTC_PCR3|=5<<8;
SIM_SOPT2|=2<<5;

 

I am expecting 16Mhz out for PTC3.  Nothing is coming out.

Any ideas on where I went wrong?

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