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# 1.27 QSPI Flash Read Write

This example shows how to use the QSPI Peripheral library to perform erase, write and read operation with the QSPI Serial Flash memory in Quad IO mode.

## Description

This example uses the QSPI peripheral library to erase and write an array of values to the QSPI Serial Flash memory. It verifies the value written by reading the values back and comparing it to the value written.

## 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 be downloaded using content manager by following these instructions.

Path of the application within the repository is apps/qspi/qspi_read_write/firmware.

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

Project Name | Description
--- | ---
sam_9x75_curiosity.X | MPLABX project for SAM9X75 Curiosity Development Board
sam_9x75_curiosity_pro.X | MPLABX project for SAM9X75 Curiosity Pro Development Board

## Setting Up AT91Bootstrap Loader

To load the application binary onto the target device, the user needs 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_9x75_curiosity.X | SAM9X75 Curiosity Development Board
sam_9x75_curiosity_pro.X | SAM9X75 Curiosity Pro Development Board

### Setting Up SAM9X75 Curiosity Development Board

- Connect the UART DEBUG J35 on board to the computer using a UART-FTDI cable (to enable debug com port)
- Connect the USB port J2 on board to the computer using a micro USB cable (to power the board)
- Connect jumper J10 (QSPI_BOOT)

### Setting Up SAM9X75 Curiosity Pro Development Board

- Connect the UART DEBUG J63 on board to the computer using a UART-FTDI cable (to enable debug com port)
- Connect the port J1 on board to the computer using a Type-C USB cable (to power the board)
- Connect jumper J12 (QSPI_BOOT)

## Running the Application

1. Build the application using its IDE.
2. LED indicates success or failure:
   - The LED is toggled when the value read from the QSPI Serial Flash memory matched with the written value
   - The LED is turned ON when the value read from the QSPI Serial Flash did not match with the written value

Refer to the following table for LED name:

Board | LED Name
--- | ---
SAM9X75 Curiosity Development Board | RGB_LED (Green)
SAM9X75 Curiosity Pro Development Board | RGB_LED (Green)

Rev: E