Hello Markus, to ensure the lowest sleep current, you have to bring all external peripherals also to the lowest energy state possible (DISCONNECTED). The internal MCU peripherals should also be desactivated like the USB port.Even then the current consumption of the whole XDK will be higher than the MCU datasheet number. Going to EM2 or EM3 is not a big issue. This depends on you having a correct setup of the wake-up interrupts and deactivating and clearing all stray or unnecessary interrupts, including the USB related ones. I have tested using the RTC and BURTC as wake-up elements, please ensure that you are configuring the LETIMER correctly before using the compare-match interrupt as wakeup source The following is a snipped taken from the real-life integration test used on EFM32 devices in order to test the MCU/Sleep component: #define SLEEP_PERIOD_IN_S (UINT32_C(2)) /* Sleep period in s */
#define EXPECTED_BURTC_FREQ (UINT32_C(1000)) /* Expected ms Tick */
/**
* This preSleep Callback disables USB and the Systick in order to sleep
*/
static Retcode_T TESTAPP_BurtcPreSleepCallback(uint32_t mode)
{
BCDS_UNUSED(mode);
NVIC_DisableIRQ(USB_IRQn);
NVIC_ClearPendingIRQ(USB_IRQn);
return RETCODE_OK;
}
/**
* This postSleep Callback restores the USB irq and the SysTick
*/
static Retcode_T TESTAPP_BurtcPostSleepCallback(uint32_t mode)
{
BCDS_UNUSED(mode);
NVIC_EnableIRQ(USB_IRQn);
return RETCODE_OK;
}
static void TestCase_SleepToEm2_Run(CCMsg_T* ccmsg)
{
BCDS_UNUSED(ccmsg);
uint32_t sleepLevel = UINT32_C(0);
uint32_t burtcFreq = UINT32_C(0);
uint32_t burtcCountValue = UINT32_C(0);
Retcode_T rc = RETCODE_OK;
Timer_T burtc = (Timer_T) MCU_Timer_GetBurtcHandle(); /* Get the BURTC Handle */
rc = MCU_Timer_Initialize(rtc, NULL);
/* Disable RTC Compare Match Settings */
RTC_IntDisable((RTC_IEN_COMP0 | RTC_IEN_COMP1));
if (RETCODE_OK == rc)
{
rc = MCU_Timer_Initialize(burtc, NULL);
}
if (RETCODE_OK == rc)
{ /* Initialize Sleep */
rc = MCU_Sleep_Initialize();
}
if (RETCODE_OK == rc)
{
/* Validate BURTC Frequency */
burtcFreq = BURTC_ClockFreqGet();
if (EXPECTED_BURTC_FREQ != burtcFreq)
{
rc = RETCODE(RETCODE_SEVERITY_ERROR, RETCODE_FAILURE);
}
}
if (RETCODE_OK == rc)
{
/* Block EM3 */
rc = MCU_Sleep_BlockSleepMode(UINT32_C(3));
}
/* Validate Lowest Sleep Level */
if (RETCODE_OK == rc)
{
sleepLevel = MCU_Sleep_GetLowestSleepMode();
if (UINT32_C(2) != sleepLevel) /* Will sleep through EM2*/
{
rc = RETCODE(RETCODE_SEVERITY_ERROR, RETCODE_FAILURE);
}
}
if (RETCODE_OK == rc)
{
rc = MCU_Timer_SetCompareValue(burtc, 0, (SLEEP_PERIOD_IN_S * EXPECTED_BURTC_FREQ)); /* Sleep for 1s*/
}
if (RETCODE_OK == rc)
{
rc = MCU_Timer_Start(burtc);
}
/* Go to sleep */
if (RETCODE_OK == rc)
{
INT_Disable();
BSP_Board_DisableSysTick();
TESTAPP_BurtcPreSleepCallback(sleepLevel);
MCU_Sleep_EnterSleep(sleepLevel);
TESTAPP_BurtcPostSleepCallback(sleepLevel);
BSP_Board_EnableSysTick();
INT_Enable();
}
if (RETCODE_OK == rc)
{
rc = MCU_Timer_GetCountValue(burtc, &burtcCountValue);
}
if (RETCODE_OK == rc)
{
if ((SLEEP_PERIOD_IN_S * EXPECTED_BURTC_FREQ) > burtcCountValue)
{
rc = RETCODE(RETCODE_SEVERITY_ERROR, RETCODE_FAILURE);
}
}
if (RETCODE_OK == rc)
{
rc = MCU_Timer_Stop(burtc);
}
/* Reporting phase */
if (RETCODE_OK == rc)
{
Tests_SendReport(rc, "EM2 Sleep Success");
}
else
{
Tests_SendReport(rc, "EM2 Sleep Failure");
}
}
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