Hi,
I can't entre VLP mode in my Kinetis KL14. The funcion VLPModeEnable hangs in the following while (marked in blue):
| VLPModeEnable - where the app "stops" |
|---|
LDD_TError Cpu_VLPModeEnable(void) { if (ClockConfigurationID != 1U) { return ERR_SPEED; /* Very low power mode not enabled in the active clock configuration. */ } if (SMC_PMSTAT == 0x04U) { /* If the system is already in VLP mode, return */ return ERR_OK; } /* SMC_PMCTRL: ??=0,RUNM=2,??=0,STOPA=0,STOPM=0 */ SMC_PMCTRL = (SMC_PMCTRL_RUNM(0x02) | SMC_PMCTRL_STOPM(0x00)); /* Enable very low power mode */ while(SMC_PMSTAT != 0x04U) { /* Wait until in the Very Low Power run mode */ } return ERR_OK; } |
Indeed I had this problem before and solved it by manually disabling a timed interrupt via a timer unit by calling TU1_Disable function before entering VLP.
I've been developing for a couple months and now the problem showed up again, but this time I can't figure the solution out.
Here is how I enter in VLP mode (I'm using User enter choice in PE options, so it is not entering VLP automatically when I set the corresponding clock configuration):
| Entering VLP |
|---|
| | /* important: theoretically the SetClockConfiguration function below should disable it, | | | * however in practice the TU1 must be disabled before it */ | | | TU1_Disable(dev_TU1); | | | PWM1_Disable(dev_PWM1); |
| | /* set clock to configuration 1 (internal clock, BLPI, 0.03125 MHz) */ | | | Cpu_SetClockConfiguration(1); | | | /* enter in low power mode */ | | | Cpu_VLPModeEnable(); |
|
And here is what I do when I want to return to Normal Mode:
| Exiting VLP |
|---|
/* disable Very Low Power Run Mode */ Cpu_VLPModeDisable(); /* set high frequency clock configuration - 16MHz */ Cpu_SetClockConfiguration(0); /* reenable TU1 PE device - see comment on TU1_Disable command below */ TU1_Enable(dev_TU1); PWM1_Enable(dev_PWM1); |
I know the TU and PWM stuff should be done internally by the PE, but this was the only way it worked before.
The question is: what could be preventing me from entering VLP?
Thank you very much!
Luiz Fernando
