1.3 ADC Polling
This example application shows how to sample an analog input in polled mode and send the converted data to console.
Description
In this example, Analog input voltage in the range of 0 V to 3.3 V is fed to the ADC and converted value is displayed on the console. The ADC conversion is triggered by software and result is polled using status API.
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/adc/adc_polled_mode/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 |
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_9x75_curiosity.X | SAM9X75 Curiosity 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)
- AD6 pin is used for analog input
- Use a jumper wire to connect Pin AN of mikroBUS (AD7 is mapped to Port Pin PA31) to 3.3 V or GND
Running the Application
- Build the application using its IDE
- Open the Terminal application (Ex.:Tera term) on the computer.
- Connect to the (USB to Serial) COM port and configure the serial settings as
follows:
- Baud : 115200
- Data : 8 Bits
- Parity : None
- Stop : 1 Bit
- Flow Control : None
- Console displays ADC Count and ADC Input Voltage
