Question
Current Consumption of STM32F4DISCOVERY in STOP mode
Posted on November 06, 2013 at 12:32
Hi guys,
I am tryng to get the lowest power consumption from STM32F407ZG. In my board wakup will be triggered by CAN bus activity. After various approaches my lowest consumption in STOP mode is 0 mA. This value is obtained after a checking and minimizing of all possible current draw from various pin and after applying some suggestion from http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/DM00033pdf My next step to understand where is the error was moving on STM32F4DISCOVERY with STM32F407VG. Surprisingly the current measured at JP1 in STOP mode is 2 mA This is my code:#include <stm32f4xx.h>
/* prototypes */
void
GeneralGPIOInitialization(
void
);
int
main(
void
)
{
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Configure gpios for low power */
GeneralGPIOInitialization();
/* Configure button */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure LED */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12|GPIO_Pin_13;
GPIO_Init(GPIOD, &GPIO_InitStructure);
/* Connect Button EXTI Line to Button GPIO Pin */
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);
/* Configure Button EXTI line */
EXTI_InitStructure.EXTI_Line = EXTI_Line0;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Enable and set Button EXTI Interrupt to the lowest priority */
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Disable PVD */
PWR_PVDCmd(DISABLE);
while
(1)
{
if
( GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0) == 0 )
{
GPIO_ResetBits(GPIOD, GPIO_Pin_12 );
/* green off */
GPIO_ResetBits(GPIOD, GPIO_Pin_13 );
/* red off */
PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);
GPIO_SetBits(GPIOD, GPIO_Pin_12 );
/* green on (short at wake-up) */
}
else
{
GPIO_ResetBits(GPIOD, GPIO_Pin_12 );
/* green off */
GPIO_SetBits(GPIOD, GPIO_Pin_13 );
/* red on */
}
}
}
/**
* @brief Catches the EXTI Line8 interrupt
* @param None
* @retval None
*/
void
EXTI0_IRQHandler(
void
)
{
EXTI_ClearITPendingBit(EXTI_Line0);
}
/* Initialize GPIO for lowest power consuption */
void
GeneralGPIOInitialization(
void
)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_StructInit(&GPIO_InitStructure);
/* Enable all GPIO clocks */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA|RCC_AHB1Periph_GPIOB|RCC_AHB1Periph_GPIOC|RCC_AHB1Periph_GPIOD|RCC_AHB1Periph_GPIOE, ENABLE);
/* configure all GPIO in AIN mode */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_Init(GPIOE, &GPIO_InitStructure);
/* Disable all GPIO clocks */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA|RCC_AHB1Periph_GPIOB|RCC_AHB1Periph_GPIOC|RCC_AHB1Periph_GPIOD| RCC_AHB1Periph_GPIOE, DISABLE);
}