Difference between revisions of "F19: Road Max Fury"

Revision as of 20:49, 18 December 2019

Project Title

Road Max Fury- Game using FreeRTOS

Abstract

Road Max Fury is a game based on a classic car racing arcade game developed in 1984 by Konami named Road Fighter. We planned to reproduce this game as a part of our CMPE 244 project. The goal is to reach the finish line without running out of time, avoiding other cars on the road or running out of fuel .The fuel is refilled by hitting petrol pump which the player can encounter at random location during the course of the game. The player also needs to prevent car from hitting the edge of the road to prevent the collision.

Objectives & Introduction

The primary goal of this project is to develop a racing game based on Road Fighter using FreeRTOS using SJ2 Board and to drive the LED matrix. The game's objective is to finish the finish line before running out of fuel and avoiding the obstacles and other cars on the road. The LED matrix is interfaced using the GPIO pins and the on board accelerometer is interfaced using I2C communication protocol.

Objectives:

• Write drivers to display road, car, traffic, score, fuel status on the RGB LED matrix and update the display continuously.
• Write drivers to give directions from the input devices ie accelerometer and filter the values to get accurate and desired values.
• Implement game algorithm for movement of car, random obstacle car and update scores and fuel status.
• Create FeeRTOS tasks for display, accelerometer values, game logic and understand the communication and synchronization between them.

Team Members & Responsibilities

• Namdev Prabhugaonkar
  
• Rutuja Shah
  
• Saumil Shah
  

Schedule

Parts List & Cost

Design & Implementation

Hardware Design

The hardware design employs the use of 64x32 RGB LED matrix panel which is the most important part of the project, this uses four data lines namely A, B, C and D which can be addressed and used to control each LED which has following technical specifications:

Dimensions:

• 110.1 x 5 x 0.2 inches

Operation Power

• AC100-240V 50-60HZ Switch-able
• 5V regulated power input, 4A max (all LEDs on)
• 5V data logic level input
• 4mm pitch
• Module Refresh: 1560hz

LED Matrix

LED FrontPanel

PCB Design

For PCB Design we used the Eagle PCB Design software. It is not free software for commercial use but is free for students. Preet took a short session on PCB designing which helped to get us started. A great advantage of Eagle PCB is that we can importAdafruit and Sparkfun library into the PCB Design software. This allows us to use the built-in footprints and schematic components of Sparkfun and Adafruit which makes designing and ordering the parts easier. The software is easy to use for a beginner.

The steps involved in the PCB design process are described in the next section.

Schematic Design:

Our Schematic is simple. We added header pins, for making connections from the LED matrix, MP3 decoder to SJ2 board and external power pins. A 2x1 header is used to for connecting external power. 20x2 header pin is used to connect the SJ2 board GPIO pins. 8x2 header pins are used to connect the LED Matrix Pins. 4x1 header is used for connecting the MP3 decoder to a UART3 GPIO pin.

PCB Schematic

PCB Layout Design:

In our PCB layout, we used 2-layered PCB (A top layer and a bottom layer). PCB traces are made in a vertical, horizontal and at 45-degree angles for a consistent layout. The top layer is traces are in RED color and the bottom layer traces are in BLUE color. Labels and markings are added for identify components and pin numbers. After completing the PCB layout (making the traces) we then performed Design Rule Check (DRC) to verify that there are no short or open connections. Finally, we generated Gerber File and sent it to JLC PCB for manufacturing.

PCB Layout

Software Design

We have four tasks Game Task Accelerometer Task Button Input Task MP3 player Task

Accelerometer

Accelerometer Detection

We used on-board accelerometer to get the values. We have used only the Y-axis values to trigger movement of the player's car. We have divided the Y-axis values into different buckets which defines where the player car should move.

Code Snippet

static void accelerometer_task(void *params) {

  acceleration__axis_data_s acc_sensor_values;
  uint32_t y = 0;
  while (1) {
    acc_sensor_values = acceleration__get_data();
    y = acc_sensor_values.y;

    switch (y) {
    case 0 ... 150: //Staright
      break;

    case 151 ... 800: //Right
      move_car_right();
      break;

    case 3100 ... 3944: //Left
      move_car_left();
      break;

    case 3945 ... 4095: //Straight
      break;

    default:
      break;
    }
    vTaskDelay(50);
  }
}

Display Module

RGB LED Matrix:

Implementation

This section includes implementation, but again, not the details, just the high level. For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash. You can include sub-sections for each of your component implementation.

Testing & Technical Challenges

Issues, Challenges and solutions to get past them

1. RGB LED Matrix Display driver

We first started by porting Adafruit’s LED driver for Arduino, however we could not get it running. So we started to implement our own driver. It worked well for the bottom half of the matrix but not the top half. We debugged the code, later to realize that the SJ2 board pins which we were using for R1, G1 and B1 were not working properly. We used other GPIO pins and it solved the issue.

2. MP3 Decoder

3. Low level Audio Sound

4. Pause Bug

When we paused the game, the display was frozen but after hitting the play button, the position of the car was way off when we paused. We realized that our accelerometer kept updating the position of the car, it was just not displayed. To solve this issue we now update the values only in the GAME PLAY state.

Conclusion

We were able to successfully design the Road Max Fury game using the RGB LED Matrix and the SJ2 board. This project helped us in having a better understanding of the FreeRTOS scheduler tasks that were used to handle the various components of the game. The understanding developed in writing the display driver from the scratch proved beneficial in resolving issues since most of the available libraries are in C++ and we encountered many problems while porting and debugging in the initial testing phase. Even though there weren't many proper datasheets and reliable tutorials for the LED Matrix, some previous semester's project report on the same display helped us gain momentum in the initial stages. We also got to work on the MP3 decoder while incorporating audio for the game design. Not only did this project help us in understanding the practical possibilities with boards like SJ2 board but also instilled in us a sense of team work and accountability for individually assigned task that helped the team overall.

Project Video

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Project Source Code

Source Files

References

• FreeRTOS documentations
• Adafruit LED matrix circuit connections
• Adafruit RGB matrix panel
• WikiPage by Preetpal Kang
• Adafruit GFX library
• MP3 Decoder Datasheet