S32k324 RTC wake up

[Prasad_330]

hi,

I am using S32k324 controller,

I am trying to put the controller in sleep mode and waking up from the RTC.

I am able to put the controller into standby mode.

But the controller is not waking from Standby mode.

RTC-API is used to  wakeup controller.

I have also attached the stand-alone rtc wake up code.

Please let me know what modifications has to be done 

[Prasad_330]

hi Julian_AragonM

I am working on s32k324 VLSR mode.

I have changed the clock to FIRC, But i am not able to make the CORE_CLK to 3MHZ.  Because the FIRC = 48MHZ  clock divider max value is only 8. so core clock = 48MHZ/8  is equal to 6MHZ.

How to change into 3MHZ.

I also wanted to know what are the module that can be used in the VLSR. I wanted use CAN and UART in VLSR mode.

how to change the "FlexCanProtocol clock" to 3MHZ

Can you plz help me out.

[Julián_AragónM]

Hi @Prasad_330,

You can select the frequency for Fast IRC from the Clocks Diagram:

And for the peripherals, please go into "Peripheral Clock View" and the source clock for each peripheral can be selected:

Best regards,
Julián

[Prasad_330]

hi Julian_AragonM

Thanks for the reply,

I have configured the clock configuration and Peripheral Clock View  as suggested by you.

But my FlexCAN configuration is configured as below snapshot and it is working properly in the RUN mode

where my FlexCAN Protocal Clock is 25000000(25Mhz).

Now in VLSR mode if I change the clock of FlexCAN  to 3000000(3Mhz), should want to do any changes in the bitrate (kbps). if  so, then how to configure.

I am getting the bus_error in VLSR mode.

Plz let me know any other configuration I am missing.

[Julián_AragónM]

Hi @Prasad_330,

The FlexCAN protocol clock needs to be configured as the peripheral clock:

Please refer to chapter 73.3.10.8 Protocol timing from the S32K3XX's reference manual. 

Best regards,
Julián

 

[Prasad_330]

Hi Julian

we are working on s32k324 very Low speed run mode for CAN 

To enter into VLSR mode from the RUN mode, I am changing the CLOCK to 3Mhz.

Before changing the clock i am de_initializing the CAN.

after changing the clock to 3MHZ ,I am reinitializing the CAN with 3Mhz

The structure (above )"FlexCAN_Config0_VLSRM"  is created by me.

It is copied from the other project where  Flex CAN Protocol Clock is equal to 3MHZ and bitrate is equal to 500Kbps.

In the RUN mode CAN Tx and RX is working fine.

In the VLSR mode 

For CAN transmission we getting the return value as "FLEXCAN_STATUS_SUCCESS" for the ever first  time and from next cycle we are getting "FLEXCAN_STATUS_TIMEOUT" and also we are not getting any bus error.

But  if CAN transmission is done @100 ms interval from external environment to the s32k324 (using CAN Analyzer) most of the time we get  the return value as "FLEXCAN_STATUS_SUCCESS"  and randomly we are getting the CAN interrupt, which we have to get for every 100ms.

I have also attached the stand alone code for CAN VLSR mode.

Plz let me know any other parameter should be taken care

[Julián_AragónM]

Hi @Prasad_330,

It seems like my colleague has already answered your post: S32k324 VLSR mode - NXP Community. Please check your bit timing parameters for the FlexCAN module.

Best regards,
Julián

[Julián_AragónM · Accepted solution]

Hi @Prasad_330,

Try to use this wake up config instead:

static inline void Rtc_Ip_SetCompareValue(uint8 instance, uint32 value)
{
    /* Set RTCVAL */
    rtcBase[instance]->RTCVAL = value;
}

void Wkup_Config(void)
{
	/* WKPU configuration */
	Wkpu_Ip_Init(WKPU_INST, &Wkpu_Ip_Config_PB);
	Wkpu_Ip_EnableInterrupt(WKPU_INST, 0);

	/* Init RTC and RTC_0_InitConfig_PB is config tool generated */
	Rtc_Ip_Init(RTC_INST, &RTC_0_InitConfig_PB);

	/* Disables the API functionality
       Clears the API interrupt flag*/
	Rtc_Ip_StopTimer(RTC_INST);

	Rtc_Ip_StartCounter(RTC_INST); 				/*<! Start the counter. */
	Rtc_Ip_SetCompareValue(RTC_INST, RTC_API_TIME);	/*<! Set counter value. */
	Siul2_Dio_Ip_WritePin(LED_PORT, LED_PIN, 0);
}

Also, make sure that SIRC is enabled in standby mode:

Best regards,
Julián

[Prasad_330]

hi Julian_AragonM

Thanks for your reply,

Your solution worked for me.

I also wanted to know is there Very Low Speed Run (VLSR) mode.

Can you please share me some documents  regarding the configuration of VLSR mode or some Sample code 

[Julián_AragónM]

Hi @Prasad_330,

You can refer to the pdf included with the Low Power Managements demos. All of the example codes contain another clock configuration which uses the FIRC for VLSR.

Best regards,
Julián