PWM synchronous channels

This example application 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/firmware .

To build the application, refer to the following table and open the project using its IDE.

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.

Setting up SAMA5D2 Xplained Ultra Evaluation Kit

Setting up the board

• Short jumper JP2 (DEBUG_DIS)
• Connect the Debug USB port on the board to the computer using a micro USB cable
• Connect PB5 (PIN 7 of XPRO EXT2) to an an oscilloscope/Logic analyzer

Running the Application

1. Build the application using its IDE
2. Observe the high-side PWM waveform on the oscilloscope
3. PWM frequency is 20 KHz
4. Duty cycle varies from 0 to 100 %

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

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