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//this is the version of our host software
unsigned int host_version = 0;
//these are our packet classes
SimplePacket hostPacket(serial_tx);
SimplePacket slavePacket(rs485_tx);
//are we paused?
boolean is_machine_paused = false;
boolean is_machine_aborted = false;
//init our variables
volatile long max_delta;
volatile long x_counter;
volatile bool x_direction;
volatile long y_counter;
volatile bool y_direction;
volatile long z_counter;
volatile bool z_direction;
//our position tracking variables
volatile LongPoint current_steps;
volatile LongPoint target_steps;
volatile LongPoint delta_steps;
volatile LongPoint range_steps;
volatile bool is_point_queue_empty = true;
//our point queue variables
uint8_t rawPointBuffer[POINT_QUEUE_SIZE * POINT_SIZE];
CircularBuffer pointBuffer((POINT_QUEUE_SIZE * POINT_SIZE), rawPointBuffer);
//buffer for our commands
uint8_t underlyingBuffer[COMMAND_BUFFER_SIZE];
CircularBuffer commandBuffer(COMMAND_BUFFER_SIZE, underlyingBuffer);
//how many queued commands have we processed?
//this will be used to keep track of our current progress.
unsigned long finishedCommands = 0;
unsigned long finishedPoints = 0;
byte commandMode = COMMAND_MODE_IDLE;
unsigned int toolPingDelay = 100;
unsigned int toolTimeout = 120;
unsigned long toolNextPing = 0;
unsigned long toolTimeoutEnd = 0;
byte currentToolIndex = 0;
#ifdef USE_SD_CARD
//SD CARD STUFF.
RepRapSDCard card;
File f;
#endif
//our buffer of bytes.
#define BUFFSIZE 64
char buffer[BUFFSIZE];
byte bufferIndex = 0;
byte error = 0;
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