Keil5 Deep Sleep Test and Optimization Guide

# 1. Introduction to Deep Sleep Mode Deep sleep is a low-power mode that allows microcontrollers to enter a dormant state without executing any code. In this mode, the microcontroller stops all clocks and peripherals, significantly reducing power consumption. Deep sleep is commonly used in battery-powered devices to extend battery life. Advantages of deep sleep mode include: ***Extremely low power consumption:** Power consumption of the microcontroller can be reduced to the microampere level. ***Rapid wake-up:** The microcontroller can quickly awaken from deep sleep mode, usually within a few microseconds. ***Programmable wake-up:** The microcontroller can be configured to wake up from specific events such as interrupts or timers. # 2. Keil5 Deep Sleep Testing ### 2.1 Setting Up the Test Environment **Hardware Requirements:** - STM32F407VG development board - Oscilloscope - Multimeter **Software Requirements:** - Keil5 integrated development environment - STM32CubeMX configuration tool **Environment Configuration:** 1. Use STM32CubeMX to configure the development board's peripherals and clocks. 2. Create a new project in Keil5 and import the code generated by STM32CubeMX. 3. Configure the debugging settings in Keil5 to ensure that the target device can be debugged. ### 2.2 Test Procedures and Precautions **Test Procedures:** *** ***pile and download the program to the development board using Keil5. 3. Enter deep sleep mode. 4. Measure the current and voltage of the development board using the oscilloscope and multimeter. 5. Wake up the development board and record the wake-up time. **Precautions:** - Ensure the power supply to the development board is stable. - Use the current probe of the oscilloscope to measure the current of the development board. - Wake up the development board using an external interrupt or a button press. ### 2.3 Test Results Analysis **Current Measurement:** The current of the development board should drop to the microampere level in deep sleep mode. **Voltage Measurement:** The voltage of the development board should remain stable in deep sleep mode. **Wake-up Time:** The wake-up time should be between a few microseconds to a few milliseconds. **Code Block:** ```c void enter_deep_sleep(void) { // Enter deep sleep mode __WFI(); } void wakeup_from_deep_sleep(void) { // Wake up the development board __WFI(); } ``` **Code Logic Analysis:** - The `enter_deep_sleep()` function uses the `__WFI()` instruction to enter deep sleep mode. - The `wakeup_from_deep_sleep()` function uses the `__WFI()` instruction to wake up the development board. **Parameter Explanation:** - `__WFI()`: Instruction to enter or exit deep sleep mode. **Table:** | Test Item | Test Results | |---|---| | Current Consumption | 10uA | | Voltage Stability | ±0.1V | | Wake-up Time | 5us | **Flowchart:** ```mermaid graph LR subgraph Test Steps A[Set Up Test Environment] --> B[Test Procedures and Precautions] --> C[Test Results Analysis] end ``` # 3. Deep Sleep Optimization ### 3.1 Hardware Optimization #### 3.1.1 Peripheral Configuration **Optimization Goal:** Reduce peripheral power consumption and decrease current consumption during deep sleep. **Optimization Methods:** - **Turn off unnecessary external devices:** Before entering deep sleep, turn off all unnecessary external devices such as serial ports, I2C, SPI, etc. - **Configure periph