1.26 TC Compare Mode
This example application shows how to use the TC module in compare mode to generate an active low, active high, and toggle output on compare match.
Description
Three TC channels are configured in compare mode. Each channel generates different output waveform depending upon configured action on compare match and period match.
Active low output: Output is set high on compare match A and is set low on compare match C.
Active high output: Output is set low on compare match A and is set high on compare match C.
Toggle output: Output toggles on compare match A.
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/tc/tc_compare_mode.
To build the application, refer to the following table and open the project using its IDE.
| Project Name | Description |
|---|---|
| sam_a7d65_curiosity.X | MPLABX project for SAMA7D65 Curiosity 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_a7d65_curiosity.X | SAMA7D65 Curiosity Board |
Setting Up SAMA7D65 Curiosity Board
- Connect an oscilloscope to the TIO pins
- Connect the USBA port J3 on the board to the computer using a Type-C USB cable (to power the board)
- Connect the UART Debug port (J35) on the board to the computer using a FTDI-USB cable
Running the Application
- Build and run the application using its IDE
- Observe generated waveforms on the oscilloscope
| Pin | Observable Characteristic of the Waveform |
|---|---|
| TC0_TIOA1(PC16) - (Pin 12 of RPi connector (J18)) | Active high output with 1 kHz frequency and 50% duty cycle |
| TC0_TIOB1(PC18) - (Pin 36 of RPi connector (J18)) | Active low output with 1 kHz frequency and 50% duty cycle |