readme.txt

LM18245 16细分步进驱动程序 Microstep C program for National Semi LMD18245/PIC microstepping driver board.

   Microstep C program for National Semi LMD18245/PIC microstepping driver
   board.

   Changlog

   April 7, 2005 Added current reduction code, driver output current reduced
                 after 3 minutes.

                 Changed microstep10 pulse routine for faster step rate.

                 Added two new sine wave lookup tables, microstep8new and
                 microstep10new. The lookup table is offset by a few degrees.
                 These need to be tested to see if they work better.

   July 27, 2006 Version 2.0
                 There is a internal hardware bug in the LMD18245 chip causing it to switch incorrectly. This makes
                 the motor have less torque in one direction at higher speeds, however the motor does not loose step position.
                 You can only switch the LMD chip direction lines (DIR A and DIR B) when the DAC value is zero. This bug was found by
                 RadekCX, a CNCZONE member and verified by [e-mail] (PICSTEP)

                 My quick fix is to make a new updated sine table that is sent to the stepper motor when the Direction
                 input line is high.

                 Bug fix only for halfstep_torque, microstep4, microstep8 and microstep10 lookup tables.

                 Removed microstep8new and microstep10new lookup tables since they don't work any better.


   mstep_cr_v2.c    C source code for stepper board, compiled with PCW CCS


   Hex files are compiled for a Microchip PIC16F627 mcu.

   Use this code at your own risk, no guarantee that it will work for you.

   This source code is for Non-commercial personal use only. If you want to use
   this code for any other purpose, please contact [e-mail] for
   a commercial license.

   Embedded Acquisition Systems
   www.embeddedtronics.com
   copyright 2004-2006