AVR DA family training - SOS Sequence Generator

This repository provides a MPLAB X project with a MCC generated code example for a SOS Sequence Generator.
The application consists of a circuit composed of Core Independent Peripherals (CIPs), which operates with involvement of the core only in the initialization part. The CIPs used are: one instance of Timer/Counter Type D (TCD0), two instances of Timer/Counter Type A (TCA0 and TCA1), four Look-Up Tables (LUT0, LUT1, LUT2 and LUT3) and the Event System (EVSYS).
The SOS message is represented by a specific waveform which drives the on board LED. That waveform is based on the Morse representation of the SOS message.

Related Documentation

More details and code examples on the AVR128DA48 can be found at the following links:

• Core Independent Solution using AVR DA Peripherals Lab
• AVR128DA48 Product Page
• AVR128DA48 Code Examples on GitHub
• AVR128DA48 Project Examples in START

Software Used

• MPLAB® X IDE 5.40 or newer (microchip.com/mplab/mplab-x-ide)
• MPLAB® XC8 2.20 or a newer compiler (microchip.com/mplab/compilers)
• MPLAB® Code Configurator (MCC) 3.95.0 or newer (microchip.com/mplab/mplab-code-configurator)
• MPLAB® Code Configurator (MCC) Device Libraries 8-bit AVR MCUs 2.3.0 or newer (microchip.com/mplab/mplab-code-configurator)
• AVR-Dx 1.2.52 or newer Device Pack

Hardware Used

• AVR128DA48 Curiosity Nano (DM164151)

Setup

The AVR128DA48 Curiosity Nano Development Board is used as test platform

The following configurations must be made for this project:

System clock: 4MHz

TCD0:

• Clock Selection: Peripheral Clock
• Counter Prescaler: Sync clock divided by 4
• Synchronization Prescaler: Selected Clock Source divided by 8
• Compare B Clear register: 0xC36
• Compare B Set register: 0x61B
• Compare B Value: enabled
• Compare B Enable: enabled

TCA0:

• Clock Selection: System Clock
• Timer Mode: 16 Bit
• Count direction: Up
• Period register: 0x22
• Waveform Generation Mode: Dual Slope PWM, overflow on TOP and BOTTOM
• Compare channel 0: enabled
• Compare channel 1: enabled
• Compare channel 2: enabled
• Channel 0 waveform duty cycle: 9%
• Channel 1 waveform duty cycle: 15%
• Channel 2 waveform duty cycle: 32%
• Compare channel 0 Output Value: enabled
• Compare channel 1 Output Value: enabled
• Compare channel 2 Output Value: enabled
• Compare output values for the three channels enabled,
• Enable Counter Event Input A: enabled

TCA1:

• Clock Selection: System Clock
• Timer Mode: 16 Bit
• Count direction: Up
• Period register: 0x22
• Waveform Generation Mode: Dual Slope PWM, overflow on TOP and BOTTOM
• Compare channel 0: enabled
• Compare channel 1: enabled
• Channel 0 waveform duty cycle: 50%
• Channel 1 waveform duty cycle: 79%
• Compare channel 0 Output Value: enabled
• Compare channel 1 Output Value: enabled
• Enable Counter Event Input A: enabled

LUT0:

• IN0: FEEDBACK
• IN1: TCA1
• IN2: EVENTA
• Filter Option: SYNCH
• Clock Selection: IN2
• TRUTH register: 0x04

LUT1:

• IN0: EVENTA
• IN1: EVENTB
• IN2: MASK
• Filter Option: DISABLED
• Clock Selection: CLKPER
• TRUTH register: 0xF1

LUT2:

• IN0: TCA0
• IN1: TCA0
• IN2: TCA
• Filter Option: DISABLED
• Clock Selection: CLKPER
• TRUTH register: 0x90

LUT3:

• IN0: TCA1
• IN1: TCA1
• IN2: EVENTA
• Filter Option: DISABLED
• Clock Selection: CLKPER
• TRUTH register: 0x04

EVSYS:

• Event generators:
  • TCD0_CPMBSET: CHANNEL0
  • CCL_LUT0: CHANNEL1
  • CCL_LUT3: CHANNEL2
  • CCL_LUT2: CHANNEL3
• Event users:
  • CHANNEL0: CCLLUT0A, TCA0CNTA, TCA1CNTA
  • CHANNEL1: CCLLUT3A
  • CHANNEL2: CCLLUT1A
  • CHANNEL3: CCLLUT1B

Pin	Configuration
PA0 (TCA0_WO0)	Digital Output
PA1 (TCA0_WO1)	Digital Output
PA2 (TCA0_WO2)	Digital Output
PA3 (LUT0_OUT)	Digital Output
PA5 (TCD_WOB)	Digital Output
PB0 (TCA1_WO0)	Digital Output
PB1 (TCA1_WO1)	Digital Output
PC6 (LUT1_OUT)(LED0)	Digital Output
PD3 (LUT2_OUT)	Digital Output
PF3 (LUT3_OUT)	Digital Output

Operation

1. Connect the board to the PC.

2. Open the avr128da48-cnano-sos-training-mcc.X project in MPLAB® X IDE.

3. Set avr128da48-cnano-sos-training-mcc.X project as main project. Right click on the project in the Projects tab and click Set as Main Project.

4. Select the AVR128DA28 Curiosity Nano in the Connected Hardware Tool section of the project settings:

• Right click on the project and click Properties;
• Click on the arrow right next to Connected Hardware Tool;
• Select the AVR128DA28 Curiosity Nano (click on the SN), click Apply and then click OK:
  

5. Program the project to the board: right click on the project and click Make and Program Device.

Demo:

SOS message waveform captured by a logic analyzer:

Note: The waveform from the image represents the SOS digital representation (presented at the beginning of this readme) negated, beacuse the LED works on inverse logic.

Summary

The demo shows how to generate the SOS message using Core Independent Peripherals (CIPs).