SPI Driver synchronous - multi client
This example demonstrates how to use single instance of the SPI driver in synchronous mode to communicate with multiple EEPROMs in an RTOS environment.
Description
This example writes and reads data to and from two separate EEPROMs connected over the same SPI bus by using the multi client feature of a synchronous SPI driver. The example also demonstrates how to setup two different client transfers at two different baud rates.
The example has three RTOS threads for the purpose:
- APP_EEPROM1_Tasks: This thread performs write-read operation on the first EEPROM
- APP_EEPROM2_Tasks: This thread performs write-read operation on the second EEPROM
- APP_MONITOR_Tasks: This thread checks the status of the EEPROM transfers and turns on the LED if the transfers are successful
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/driver/spi/sync/spi_multi_slave/firmware .
To build the application, refer to the following table and open the project using its IDE.
| Project Name | Description |
|---|---|
| sam_a5d2_xult_freertos.X | MPLABX project for 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_freertos.X sam_a5d2_xult_freertos_iar.IAR/spi_multi_slave_freertos_sam_a5d2_xult_freertos.eww/spi_multi_slave_freertos_sam_a5d2_xult_freertos.eww | SAMA5D2 Xplained Ultra Evaluation Kit |
Setting up SAMA5D2 Xplained Ultra Evaluation Kit
Addtional hardware required
- Two EEPROM 4 Click boards
- Two mikroBUS Xplained Pro boards
Setting up the SD Card
- Download harmony MPU bootstrap loader from this location
- Copy the downloaded boot loader binary( boot.bin) onto the SD card
Setting up the board
- Install EEPROM 4 Click boards on to the mikroBUS Xplained Pro boards
- Connect mikroBUS Xplained Pro on to the “EXT1” and “EXT2” headers
- Short jumper JP2 (DEBUG_DIS)
- Connect the Debug USB port on the board to the computer using a micro USB cable
Running the Application
- Build the application using its IDE
- The LED turns ON when the data read from the EEPROMs matches with the data written to the EEPROMs.
Refer to the following table for LED name:
| Board | LED Name |
|---|---|
| SAMA5D2 Xplained Ultra Evaluation Kit | RGB_LED(Green) |