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# 1.29 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
sam_a7d65_curiosity_pro.X | MPLABX project for SAMA7D65 Curiosity Pro 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
sam_a7d65_curiosity_pro.X | SAMA7D65 Curiosity Pro Board

### Setting Up SAMA7D65 Curiosity Board

Setting up the 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

### Setting Up SAMA7D65 Curiosity Pro Board

Setting up the board:

- Connect an oscilloscope to the TIO pins
- Connect the USBA port J1 on the board to the computer using a Type-C USB cable (to power the board)
- Connect the UART Debug port (J63) on the board to the computer using a FTDI-USB cable

## Running the Application

1. Build and run the application using its IDE.
2. Observe generated waveforms on the oscilloscope.

SAMA7D65 Curiosity Board:

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

SAMA7D65 Curiosity Pro Board:

Pin | Observable Characteristic of the Waveform
--- | ---
TC0_TIOA1(PC16) - (Pin 12 of RPi connector (J71)) | Active high output with 1 kHz frequency and 50% duty cycle
TC0_TIOB1(PC18) - (Pin 36 of RPi connector (J71)) | Active low output with 1 kHz frequency and 50% duty cycle

Rev: C