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README.md

Cellular Polymaton

About

This implements a generalized cellular automaton framework for creating automaton using unique geometry. I created this to allow me to make sculptures using light to represent cell state using shapes other than a simple square grid. This required being able to explicitly say which cells are neighbors to each other. The project is available under the MIT License.

Configuration

Make a duplicate of one of the projects in the "projects" directory, change the Makefile's CONFIG_H variable to point to the correct file, and edit the config.h file to your liking.

Required

#define CFG_CELL_COUNT  <size_t>

The number of cells in the automaton.

#define CFG_MOST_NEIGHBORS  <size_t>

The number of neighbor cells the cell with the most neighbors has.

struct rules cfg_rules

The members 'live' and 'dead' define the rules for cells that are alive and dead. For example { 0b00001100, 0b00001000 } defines rules for Conway's Game of Life. The first bit field has bits 2 and 3 set, meaning cells with 2 or 3 living neighbors will stay alive (as the first rule set is for currently living cells). The second bit field has only bit 3 set, meaning cells with three living neighbors will be born (as the second rule set is for cells that are currently dead).

struct cells cfg_cells

This has two members, 'neighbors' and 'initial_state'. 'neighbors' defines the cells that are considered neighbors to each cell and 'initial_state' defines the initial state of the cell. Cell's are identified by the position in the cfg_cells[] array and neighbor relationships are defined in a bit field such that a bit field of 0b1100 means a cell is neighbors with the cells at index 2 and 3 (as bits 2 and 3 are set). 'initial_state' is either 'DEAD' or 'LIVE' but these are truly just macros for false and true respectively so boolean values can be used as well. As an example here is a simple cfg_cells array defining a two cell automaton where the first cell starts out alive the second starts dead and they are both neighbors to eachother: { { 0b10, LIVE }, { 0b01, DEAD } }

Optional

#define CFG_WAIT_COUNT <int>

The number of interrupts to left occur before updating the world's state. Defaults to 1.

#define CFG_ENABLE_USART

If this is defined the automaton will output cell data over serial.

#define CFG_USART_BAUDRATE  <uint64_t>

This defines the baudrate of the serial port.

#define CFG_USART_SET_BIT_MSG   <char[]>
#define CFG_USART_CLR_BIT_MSG   <char[]>

The string to use when outputting the bit states over serial. These are "1" and "0" by default.

#define CFG_ENABLE_SHIFT

If defined the state will be shifted out to a shift register (like the 74HC595) using the definitions below.

#define CFG_SHIFT_REGISTER_PIN_COUNT    <int>

The total number of pins between all the shift registers including unused pins. If you have three 74HC595 shift registers then this number will be 24 because 8 * 3 is 24.

#define CFG_SHIFT_DDR   <DDRn>
#define CFG_SHIFT_PORT  <PORTn>
#define CFG_RCLK        <PINn>
#define CFG_SER         <PINn>
#define CFG_SRCLK       <PINn>

The ports and pins used for controlling the shift registers. If you are using PB0, PB1, and PB2 to respectively control the RCLK, SER, and SRCLK pins of the shift registers then you would define them as follows:

#define CFG_SHIFT_DDR   DDRB
#define CFG_SHIFT_PORT  PORTB
#define CFG_RCLK        PIN0
#define CFG_SER         PIN1
#define CFG_SRCLK       PIN2

Compilation

Build: $ make -f projects/PROJECT_DIR/Makefile

Flash: $ make -f projects/PROJECT_DIR/Makefile program

Clean: $ make -f projects/PROJECT_DIR/Makefile clean

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