Hello,
I am using the STM32WBA65RI Dev Kit. For current measurements, I am powering the board with an external supply that includes current measurement capability, connected directly to pin 1 of JP2. The JP4 jumper is removed.
According to the reference manual (Table 54), there are expected current consumption values for Standby mode (with RTC enabled and IWDG disabled).
I performed four tests with the following configurations:
- RTC clocked by LSI and LSI/128
- ULPMEN = 1
- VDD = 1.8 V and 3.3 V
However, my measured current is consistently higher than the specified values:
- LSI/128, 1.8 V → Expected: 210 nA, Measured: 658 nA
- LSI/128, 3.3 V → Expected: 510 nA, Measured: 989 nA
- LSI, 1.8 V → Expected: 330 nA, Measured: 835 nA
- LSI, 3.3 V → Expected: 790 nA, Measured: 849 nA
My code is based on the ST example “Standby with RTC”, with the addition of enabling the ULPMEN bit in the PWR_CR1 register.
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_ICACHE_Init();
MX_RTC_Init();
SystemPower_Config();
CLEAR_BIT(DBGMCU->SCR, DBGMCU_SCR_DBG_STANDBY);
/* Check and handle if the system was resumed from StandBy mode */
if(__HAL_PWR_GET_FLAG(PWR_FLAG_SBF) != RESET)
{
/* Clear Standby flag */
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_SBF);
}
SET_BIT(PWR->CR1, PWR_CR1_ULPMEN);
/* Insert 5 seconds delay */
HAL_Delay(5000);
/* Enable wakeup line 7 for RTC */
HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN7_HIGH_3);
HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);
/* Clear all related wakeup flags */
__HAL_PWR_CLEAR_FLAG(PWR_WAKEUP_ALL_FLAG);
/* Re-enable wakeup source */
if (HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, 0xFFFF, RTC_WAKEUPCLOCK_RTCCLK_DIV16, 0) != HAL_OK)
{
Error_Handler();
}
/* Enter the Standby mode */
HAL_PWR_EnterSTANDBYMode();
Also, my goal was to sleep for 1 minute, and then wake-up and do BLE advertise for 10 seconds. And so on. How can I integrate the BLE stack here to accomplish this?
Best regards.
