Stepper motor with L293D

[YahooArchive]

Hi everyone,
I had a problem to control a stepper motor with L293D.

I had connected my stepper motor in following way.
http://www.8051projects.net/stepper-mot ... tepper.gif

And I used IO(1~4) as output to control the stepper motor.
The following code is to generate pulse to drive the motor.


#include "coridium.h"
#include "cor_init.h"
#include "cor_hwlib.h"
#include "cor_wrflash.h"

#include "mem.h" // not used here, included only for reference
#include "string.h"
#include "printf.h"
#include "constants.h"

//#define USE_FLOAT

#ifdef USE_FLOAT // for the LPC175x you must also add to USERargs "-mfpu=vfp"
#include
#endif

int main(void)
{


init_coridium(); // REQUIRED OPERATION

OUTPUT(15);
LOW(15);


while (1) {
printf("Send pulse");
OUTPUT(0);
HIGH(0);
OUTPUT(1);
OUTPUT(2);
OUTPUT(3);
OUTPUT(4);
for (i=0; i<1000; i++) {
HIGH(1);LOW(2);LOW(3);LOW(4);
WAIT (5);
LOW(1);LOW(2);HIGH(3);LOW(4);
WAIT (5);
LOW(1);HIGH(2);LOW(3);LOW(4);
WAIT (5);
LOW(1);LOW(2);LOW(3);HIGH(4);
}
}

return 0;
}


L293D Datasheet
http://www.st.com/stonline/products/lit ... s/1330.pdf

However, my stepper motor is not doing anything at all.Does anyone spot
any problem of my code or connection?

[YahooArchive]

Missing a wait after the last step.

Try lengthening the wait.

Like always if all else fails, check the wiring.