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# 1.24 SHDWC Wakeup

This example application shows how to shutdown and wakeup the device using SHDWC peripheral.

## Description

Application starts by toggling the LED, indicating that the device is up and running. Upon pressing the switch, it goes to shutdown mode (stops toggling the LED). Upon pulling the PIOBU0 pin to high, the device is reboot and the LED starts toggling again.

## 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/shdwc/rtc_wakeup/firmware.

To build the application, refer to the following table and open the project using its IDE.

Project Name | Description
--- | ---
sam_a7g5_ek.X | MPLABX project for SAMA7G54 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 | Description
--- | ---
sam_a7g5_ek.X | SAMA7G54 Evaluation Kit

### Setting Up SAMA7G5 Evaluation Kit

ADDITIONAL HARDWARE REQUIRED

- SD Card with FAT32 file system

SETTING UP THE SD CARD

- Download harmony MPU bootstrap loader
- Copy the downloaded boot loader binary( boot.bin) onto the SD card

SETTING UP THE BOARD

- SDMMC slot used for bootloading the application is SDMMC0 (J4)
- 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)
- Open Jumper J3(OFF State)
  Note: Reset push button is labeled as SW3.

## Running the Application

1. Build the application using its IDE
2. Copy the output binary (named ‘harmony.bin’) onto the SD Card (Refer to the ‘Setting up hardware’ section above for setting up the SD card)
3. Insert the SD card into SDMMC slot on the board (Refer to the ‘Setting up hardware’ section for the correct SDMMC slot)
4. Reset the board to run the application
5. LED toggles indicating the board is up and running
6. Press Switch A to shutdown the device (LED toggling stops)
7. Device wakes up after 5 seconds upon RTC alarm (indicated by the LED starting to toggle again)

Following table provides details of switches and LED:

Board | Switch A | LED Name
--- | --- | ---
SAMA7G54 Evaluation Kit | SW1 | RGB_LED (Blue)