Low power modes
This example application shows how to enter low power modes of SAMA5D27 MPU.
Description
The Clock system generates and distributes the clock for the processor and peripherals. This example application shows how device enters in the Idle mode and Ultra low power mode.
Downloading and building the application
To clone or download this application from Github, go to the main page of this repository and then click Clone button to clone this repository or download as zip file. This content can also be downloaded using content manager by following these instructions.
Path of the application within the repository is apps/clock/low_power/firmware .
To build the application, refer to the following table and open the project using its IDE.
| Project Name | Description |
|---|---|
| sam_a5d2_xult.X | SAMA5D2 Xplained Ultra Evaluation Kit |
Setting up AT91Bootstrap loader
To load the application binary onto the target device, we need to use at91bootstrap loader. Refer to the at91bootstrap loader documentation for details on how to configure, build and run bootstrap loader project and use it to bootstrap the application binaries.
Setting up the hardware
The following table shows the target hardware for the application projects.
| Project Name | Board |
|---|---|
| sam_a5d2_xult.X | SAMA5D2 Xplained Ultra Evaluation Kit |
Setting up SAMA5D2 Xplained Ultra Evaluation Kit
Setting up the board
- Short jumper JP2 (DEBUG_DIS)
- Connect the USB port J22 on board to the computer using a micro USB cable (to enable debug com port)
- Connect the USB port J7 on board to the computer using a micro USB cable (to power the board)
Running the Application
- Build the application using its IDE
- Open the Terminal application (Ex.:Tera term) on the computer.
- Connect to the EDBG/Jlink Virtual COM port and configure the serial settings as follows:
- Baud : 115200
- Data : 8 Bits
- Parity : None
- Stop : 1 Bit
- Flow Control : None
- Press ‘0’ in the terminal window
- Observe the message “Entering Idle Mode for 30 seconds” in the terminal window
- Wait for 30 seconds and observe the message “Leaving Idle Mode” in the terminal window
- Press ‘1’ in the terminal window
- Observe the message “Entering ULP0 Mode for 30 seconds” in the terminal window
- Wait for 30 seconds and observe the message “Leaving ULP0 Mode” in the terminal window.
