AN4365 datasheet(19/35 Pages) STMICROELECTRONICS

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AN4365

STM32F4 current consumption measuring

2.1.3

How to use the current consumption firmware

This part provides guidelines on how to use the firmware to achieve the required

measurements.

By default, all modes and sub-modes of each device are defined to be measured at power

switching menu runtime. The user should just load the required code into the device’s Flash

memory and start measuring mode by mode. To customize the firmware, proceed as

follows:

•

Define Power mode

As a first step, the user checks the defined power mode in file “main.h” and excludes any

undesirable power mode from the measurement process by commenting the corresponding

macros.

In this example, we comment the RUN and SLEEP mode macros in order to measure only

the Stop and Standby modes.

Uncomment

the

corresponding

line

select

power

mode(s)

that

will be measured */

//#define RUN_MODE

//#define SLEEP_MODE

#define STOP_MODE

#define STANDBY_MODE

To debug code, the user should uncomment the DEBUG macro in “main.h”.

•

Define Power sub-modes

“pwr.modes.h” contains all the power sub-mode macros for all STM32F4 devices. By

default, all available sub-modes are defined to be measured. If the user wants to customize

his switching menu and measure specific sub-modes, he needs to comment macros of

those he will not measure. This way, the firmware will execute only the defined power sub-

modes one by one. Only for Standby mode, we can define and measure one only sub-mode

because the device will reset at the moment of waking-up.

The following is an example for Stop mode, performed while measuring current

consumption for an STM32F429x/439x device. We want to measure only Stop modes with

low-power regulator, so we should keep both selected sub-modes, and comment the other

ones:

//#define StopMainRegFlashStop_enter

//#define StopMainRegFlashPwrDown_enter

#define StopLowPwrRegFlashStop_enter

#define StopLowPwrRegFlashPwrDown_enter

//#define StopMainRegUnderDriveFlashPwrDown_enter

//#define StopLowPwrRegUnderDriveFlashPwrDown_enter

After defining the modes and sub-modes, some parameters can be customized, i.e. the ART

accelerator status and the supply voltage value.

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