Example Summary

Example that uses the ADC driver to make a number of samples and print them via UART.

Peripherals & Pin Assignments

When this project is built, the SysConfig tool will generate the TI-Driver configurations into the ti_drivers_config.c and ti_drivers_config.h files. Information on pins and resources used is present in both generated files. Additionally, the System Configuration file (*.syscfg) present in the project may be opened with SysConfig’s graphical user interface to determine pins and resources used.

• CONFIG_ADC_0 - ADC instance.
• CONFIG_ADC_1 - ADC instance.

BoosterPacks, Board Resources & Jumper Settings

For board specific jumper settings, resources and BoosterPack modifications, refer to the Board.html file.

If you’re using an IDE such as Code Composer Studio (CCS) or IAR, please refer to Board.html in your project directory for resources used and board-specific jumper settings.

The Board.html can also be found in your SDK installation:

<SDK_INSTALL_DIR>/source/ti/boards/<BOARD>

Example Usage

• Example output is generated through use of Display driver APIs. Refer to the Display driver documentation.

• Connect the ADC channels to the sampling sources.
  • For quick testing, connect CONFIG_ADC_0 to GND and CONFIG_ADC_1 to 3V3.

Important: Caution should be used when connecting the pins to analog inputs greater than 3VDC.

• Open a serial session (e.g. PuTTY, etc.) to the appropriate COM port.
  • The COM port can be determined via Device Manager in Windows or via ls /dev/tty* in Linux.

The connection will have the following settings:

    Baud-rate:     115200
    Data bits:          8
    Stop bits:          1
    Parity:          None
    Flow Control:    None

• Run the example.

Example snippet of outputs:

    CONFIG_ADC_1 raw result (4): 230

    CONFIG_ADC_1 convert result (4): 2500000 uV
                .                 .     .
                .                 .     .
                .                 .     .
    CONFIG_ADC_1 raw result (9): 280

    CONFIG_ADC_1 convert result (9): 3000000 uV

• The example outputs one sample from CONFIG_ADC_0 and ten samples from CONFIG_ADC_1.

• The actual conversion result values may vary depending on the reference voltage settings. Please refer to the board specific datasheet for more details.

Application Design Details

This application uses two threads:

threadFxn0 - performs the following actions:

1. Opens an ADC driver object.

2. Uses the ADC driver object to perform a single sample and outputs the result.

3. Closes the ADC driver object.

threadFxn1 - performs the following actions:

1. Opens an ADC driver object.

2. Uses the ADC driver object to perform 10 samples and output the results.

3. Closes the ADC driver object.

FreeRTOS:

• Please view the FreeRTOSConfig.h header file for example configuration information.