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# 1.21 PWM Generation

This example shows how to use the PWM peripheral to generate 3-phase PWM signals with dead time.

## Description

This example shows how to configure the PWM to generate synchronous 3-phase PWM signals with dead time (used for motor control). The duty cycle of the PWM is updated in the interrupt handler.

## 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/pwm/pwm_synchronous_channels.

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 the USBA port J3 on the board to the computer using a Type-C USB cable (to power the board)

### Setting Up SAMA7D65 Curiosity Pro Board

Setting up the board:

- Connect the USBA port J1 on the board to the computer using a Type-C USB cable (to power the board)

## Running the Application

1. Build and Program the application using their respective IDEs.
2. Observe the high-side and low-side PWM waveforms on the oscilloscope.
3. Observe the dead time between the high side and low side.

Refer to the below table for PWM output pins for different boards:

PWM Channel | SAMA7D65 Curiosity Board / SAMA7D65 Curiosity Pro Board
--- | ---
CH0_PWML | PA19 (Pin 24 of RPi connector(J18))
CH0_PWMH | PA20 (Pin 26 of RPi connector(J18))
CH1_PWML | PB17 (Pin 33 of RPi connector(J18))
CH1_PWMH | PA22 (Pin 15 of mikroBUS2 connector(J26))
CH2_PWML | PA23 (Pin 10 of RPi connector(J18))
CH2_PWMH | PA24 (Pin 8 of RPi connector(J18))

Rev: C