KL15Z128 UART not working in RUN Mode

[shrejjjhh]

Hi  am using KL15Z128 in RUN mode. But I the code gets stuck in UARTEnableRxInterrupt (). Please see the code below:

//------------------------------------------------------------------------------------//

void main()

{

  ClockConfigBootClockRUNMode();

 //ClockConfigBootClockVLPRMode();       //it works

  UARTInit();     // Initialize UART port 

  UARTEnableRxInterrupt ();  // Enable Rx Interrupt

}

void UARTInit(void)

{

   lpsci_config_t ltUARTConfig;

   LPSCI_GetDefaultConfig(&ltUARTConfig);
   ltUARTConfig.stopBitCount = 0;
   ltUARTConfig.baudRate_Bps = 9600;
   ltUARTConfig.parityMode = 3;
   ltUARTConfig.enableRx = 1;
   ltUARTConfig.enableTx = 1;
   

   //Initialize UART Peripheral
   Chip_UART_Init(&ltUARTConfig);

   /* Enable interrupt in NVIC. */
   EnableIRQ(UART0_IRQn);       

}

//-----------------------------------------------------------------------------//

However the above code works well with VLPR Mode. Attached here the ClockConfig.c file for different configurations of RUN mode and VLPR mode.

Regards,

shreekant

[jingpan]

Hi,

UART0_CLK has different clock source. In RUN mode, UART0 clock can be set up to 48M. In VLPR mode, UART0_CLK max is 4M. You may have to use different setting in these two mode.

Please refer to the example in SDK package\boards\frdmkl43z\demo_apps\power_mode_switch. It switch work mode while keep uart work.

Regard,

Jing

[shrejjjhh]

Hi Jing,

I had tried the same code(SDK package\boards\frdmkl43z\demo_apps\power_mode_switch) before, but the code is getting stuck at below function.

Please see red text where my code gets stuck

//--------------------------------------------------------------------------------------------

void CLOCK_InitOsc0(osc_config_t const *config)
{
 uint8_t range = CLOCK_GetOscRangeFromFreq(config->freq);

 OSC_SetCapLoad(OSC0, config->capLoad);
 OSC_SetExtRefClkConfig(OSC0, &config->oscerConfig);

 MCG->C2 = ((MCG->C2 & ~OSC_MODE_MASK) | MCG_C2_RANGE(range) | (uint8_t)config->workMode);

 if ((kOSC_ModeExt != config->workMode) && (OSC0->CR & OSC_CR_ERCLKEN_MASK))
 {
   /* Wait for stable. */
   while (!(MCG->S & MCG_S_OSCINIT0_MASK))    //Code stuck here.
   {
   }
 }
}

//-------------------------------------------------------------------------------------------------

Regards,

Shrey

[jingpan]

Hi,

It seems your crystal oscillator doesn't work properly. Please observe if the oscillator is start-up and if the oscillator wave is stable. Please see chapter 25 in rm.

Regards,

Jing

[shrejjjhh]

Hi jing,

Is there any effect of crystal we are using? I am using ABS07 for my application which has frequency 32.768KHz.

Regards,

shrey

[jingpan]

Hi,

32.768k crystal should be ok. I suggest you to use MCUXpresso Config Tools to create clock config file. You can see the clock path easily.

Regards,

Jing

[shrejjjhh]

Hi jing,

I am using the same tool MCUXpresso Config Tools for clock configuration. The default clock configuration for MKL15Z128CAD4R shows UART0 clock is inactive as shown in the diagram.

Regards,

shrey

[jingpan]

Hi,

Please set as my picture. Remember you can click every thing on the diagram that you want to change.

Regards,

Jing

[shrejjjhh]

Hi Jing,

Thanks for your replay. The above settings worked for me but in FEI mode.

Regards,

shrey

[jingpan]

Hi,

It seems the erternal 32.769k crystal does not work properly. Can you try other crystal model?

Regards,

Jing