1.17 I2C Driver Asynchronous - Multi Client
This example application demonstrates the multi-client feature of the asynchronous mode of the I2C driver by communicating with an external EEPROM and a temperature sensor.
Description
This example uses the I2C driver in asynchronous mode and demonstrates the multi-client feature. The example uses a IO1 Xplained Pro Extension Kit that has a temperature sensor and an EEPROM, both interfaced on the same I2C bus.
Two application tasks are created which act as clients to the same instance of the I2C driver:
- APP_I2C_TEMP_SENSOR_Tasks:
- Reads temperature every 1 second, prints on console and notifies the EEPROM client
- The Time System Service is used to generate a callback every 1 second
- APP_I2C_EEPROM_Tasks:
- Writes temperature values to the EEPROM once the temperature read complete notification is received
- The task also reads and prints the last five saved temperature data from the EEPROM when user enters any key on the console
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/i2c/async/i2c_multi_slave/firmware.
To build the application, refer to the following table and open the project using its IDE.
| Project Name | Description |
|---|---|
| sam_e70_xult.X | MPLABX project for SAM E70 Xplained Ultra Evaluation Kit |
| sam_e70_xult_freertos.X | MPLABX project for SAM E70 Xplained Ultra Evaluation Kit |
| sam_v71_xult.X | MPLABX project for SAM V71 Xplained Ultra Evaluation Kit |
| sam_v71_xult_freertos.X | MPLABX project for SAM V71 Xplained Ultra Evaluation Kit |
Setting Up the Hardware
The following table shows the target hardware for the application projects.
| Project Name | Description |
|---|---|
| sam_e70_xult.X sam_e70_xult_freertos.X | SAM E70 Xplained Ultra Evaluation Kit |
| sam_v71_xult.X sam_v71_xult_freertos.X | SAM V71 Xplained Ultra Evaluation Kit |
To run the demo, the following additional hardware are required:
- IO1 Xplained Pro Extension Kit (Default address of the temperature sensor and EEPROM are 0x4F and 0x57 respectively)
Setting Up SAM E70 Xplained Ultra Evaluation Kit
- Connect the IO1 Xplained Pro Extension Kit to the EXT1 header
- Connect the Debug USB port on the board to the computer using a micro USB cable
Setting Up SAM V71 Xplained Ultra Evaluation Kit
- Connect the IO1 Xplained Pro Extension Kit to the EXT1 header
- Connect the Debug USB port on the board to the computer using a micro USB cable
Running the Application
- 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
- Build the application using its IDE
- Observe the temperature values getting printed on the terminal application every 1 second and temperature value written into EEPROM notification as shown below
- Press any key on the terminal, last 5 temperature values will be read from the
EEPROM and displayed as shown below
