stepper motorprogramming using msp430

[karthickb3e]

hi all,
I am newbie to msp430 and stepper motor...... i need sample program for stepper motor (bipolar) control program for reverse and forward direction.. please any one share program using MSP430 (in C/C++ language)

 

[doraemon]

Hello!

Let's suppose your chip is wired to a FET H bridge and that you can drive
4 outputs low or high using one port.
For instance, if you use port 1, and assuming that coil A + corresponds to
P1_0, A- to P1_1, B+ to P1_2, and B- to P1_3, then you may want to write:

#define COILA_P 0x01
#define COILA_N 0x02
#define COILB_P 0x04
#define COILB_N 0x08

P1DIR = 0x0F; // Allow P1 pins 0 to 3 to output
P1OUT = 0. // Disable everything.

uint8 step[4] = {COILA_P, COILB_P, COILA_N, COILB_N}; // Step sequence for bipolar motor to go forewards

uint8 crt_step = 0; // Current step index;
while(1) {
P1OUT = step[crt_step++];
if(crt_step == 4) crt_step = 0;
delay(some_delay);
}

It should spin...
Now if you change cry_step++ to cry_step--, then it should go backwards. In this case, don't forget
to change the next line to if(crt_step == 255) crt_step = 0;
And from there, you can have myriads of variants with half-steps, sine / cosine steps, etc...

Dora.

 

[karthickb3e]

thank u very much my friend...i not yet purchased the controller and the driver.. can u suggest the msp 430 controller and the h-bridge driver............
also share if any sample program u have or useful link

 

[doraemon]

Hello!

I cannot tell you, it depends on the other functionality of your program. If you
just want to test a stepper motor, then you need 4 output pins and a launchpad
might be enough.

In my case, I used a 5510 because I wanted analog inputs and I also wanted
the possibility to upgrade the firmware by USB. The 5510 is quite cheap.

As for the H bridge, I cannot tell you. It depends on what power you need.

Dora.