Silicon Laboratories Stepper Machine User Manual download pdf (Page 22)

AN155

22 Rev. 1.1

APPENDIX E - CODE LISTING

//-----------------------------------------------------------------------------

// Stepper.c

//-----------------------------------------------------------------------------

// Includes

//-----------------------------------------------------------------------------

#include <c8051f300.h> // include SFR declarations

//-----------------------------------------------------------------------------

// defines and typedefs

//-----------------------------------------------------------------------------

#define SYSCLK 24500000 // SYSCLK frequency in Hz

#define BAUDRATE 57600 // Baud rate of UART in bps

#define READ_BUFFER_SIZE 16 // change UART receive buffer size here

#define WRITE_BUFFER_SIZE 16 // change UART receive buffer size here

#define ON 0 // LED is active low

#define OFF 1

#define ACCELERATE 3 // motor states

#define SLEWING 2

#define DECELERATE 1

#define DONE 0

#define INIT_TZERO 80 // Tzero used at start-up and with

// manual mode, change value here for

// different stepper motors

typedef union // union used for writing to TL0 & TH0

{

struct

{

unsigned char hi;

unsigned char lo;

} b;

unsigned int w;

}udblbyte;

//-----------------------------------------------------------------------------

// Global CONSTANTS

//-----------------------------------------------------------------------------

// half step stepper motor step pattern

// transistors are in order B-,B+,A-,A+

// 0x01 = 0001

// 0x05 = 0101

// 0x04 = 0100

// 0x06 = 0110

// 0x02 = 0010

// 0x0A = 1010

// 0x08 = 1000

// 0x09 = 1001

const unsigned char code StepPattern[8]=

{0x01,0x05,0x04,0x06,0x02,0x0A,0x08,0x09};

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Silicon Laboratories Stepper Machine User Manual Page 22

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