Question
IDD measurement in STM32L4R9AI
I am trying to measure the IDD on the STM32L4R9AI-EVAL board by connecting a hand-held meter to the jumper JP4 in different low power modes. I am seeing a current of about 220 uA in all of the three stop modes (0, 1 and 2). This seems to be higher than the advertised value. This is the code I am running to put the CPU in low power mode.
Can you assist what could be wrong?
int main ( void )
{
OS_ERR err;
HAL_Init();
// Initialize CPU clock
BSP_SystemClkCfg();
/* -2- Configure EXTI13 (connected to PC.13 pin) in interrupt mode */
// EXTI15_10_IRQHandler_Config();
while(1)
{
HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);
}
}
void BSP_SystemClkCfg (void)
{
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
/* Enable voltage range 1 boost mode for frequency above 80 Mhz */
__HAL_RCC_PWR_CLK_ENABLE();
HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1_BOOST);
__HAL_RCC_PWR_CLK_DISABLE();
/* Enable MSI Oscillator and activate PLL with MSI as source */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
RCC_OscInitStruct.MSIState = RCC_MSI_ON;
RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
// Following settings generate a system and core clock of 24 MHz
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_7; /*!< MSI = 8 MHz. Do not modify this value used as SAI Source, MMC */
RCC_OscInitStruct.PLL.PLLM = 1;
RCC_OscInitStruct.PLL.PLLN = 12;
RCC_OscInitStruct.PLL.PLLP = 7;
RCC_OscInitStruct.PLL.PLLQ = 4;
RCC_OscInitStruct.PLL.PLLR = 4;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
/* Initialization Error */
while(1);
}
/* To avoid overshoot due to maximum frequency, select PLL as system clock source */
/* with prescaler dividers 2 as first step */
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV2;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
{
/* Initialization Error */
while(1);
}
/* Pprescaler dividers at 1 as second step */
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
{
/* Initialization Error */
while(1);
}
}