ATtiny1617 Quadrature Decoding using CCL with TCA and TCB

Incremental quadrature encoders are used in a great number of applications across many disciplines as they provide a low-cost way of measuring motion in systems with moving parts. Some typical examples include measuring the position of a physical control wheel or measuring the rotor angle and velocity in an electrical motor.

The example is explained in more details in the application note AN2434.

Related Documentation

• AN2434 - Interfacing Quadrature Encoder using CCL with TCA andTCB
• ATtiny1617 Product Page

Software Used

• MPLAB X IDE v6.25 or later
• XC8 (v3.00) alternatively AVR/GNU C Compiler 5.4.0 can be used
• ATtiny_DFP 3.3.272 or later

Hardware Used

• ATtiny1617 QFN
• STK600
• STK600 Routing card
• STK600 QFN24
• Quadtrature Encoder

Setup

Setup the connections as described in the diagram above

Operation

1. Download the zip file or clone the example to get the source code.
2. Open attiny1617-quadrature-decoding-mplab.X in MPLAB.
3. Connect the ATtiny1617 with your programmer of choice, we used a Atmel ICE.
4. Make sure the kit is selected as the tool to be programmed under project settings.
5. Press the make and program button to program the device.
6. Interact with the encoder and see the effect on count PA7 direction PA4.

Conclusion

We have shown how you can use a attiny1617 to do quadrature decoding. Refer to the application note AN2434 for more details about the implementation.