stepper motor code for cortex ARM help...

embed_v · May 15, 2011

hiii i have some stepper code here but i am confusing the if (Motor_Steps--) statement so help me for understanding this code

Code:

BOOL Pulse_Motor(void)
{
if(State)
{
GPIO_PORTE_DATA_R = MOTOR_STEP_OUT;
State = 0;
}
else
{
GPIO_PORTE_DATA_R = 0;
State = 1;
Step_Table_Index++;
}

if (Motor_Steps--)
{
// Set next match value
TIMER0_MATCHR_R = TIMER0_TC_R+Motor_deltaTimer_Value;
}
else
{
Motor_Stop();

}
return 0;..................................is it right?
}

if any wrg then suggest plz...
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ZASto · May 15, 2011

You posted only a small portion of the code, but as far as I can see, this piece of code is related to pulse duration.

And, please, use CODE tags to format your code for readability.

Code:

BOOL Pulse_Motor(void)
{
	if(State)
	{
		GPIO_PORTE_DATA_R = MOTOR_STEP_OUT;
		State = 0;
	}
	else
	{
		GPIO_PORTE_DATA_R = 0;
		State = 1;
		Step_Table_Index++;
	}

	if (Motor_Steps--)
	{
		// Set next match value
		TIMER0_MATCHR_R = TIMER0_TC_R+Motor_deltaTimer_Value;
	}
	else
	{
		Motor_Stop();

	}
	return 0;..................................is it right?
}

alexan_e · May 15, 2011

the if (Motor_Steps--) will be true as long as the Motor_Steps variable is not zero.
Note that a post-decrement operation (changed after evaluation) is used so the value will be evaluated and then decremented.

Code C - [expand]
1
2
++x;  --x;      // pre-increment/pre-decrement operation   (changed before evaluation)
x++;  x--;      // post-increment/post-decrement operation  (changed after evaluation)

Alex

jeffy665 · Aug 10, 2012

hai,

can u send me whole code for stepper motor,I am doing a project regarding stepper motor control & also I want to create a GUI application to control it by using serial com, I have no idea about this, can u plz help me.

embed_v said:
hiii i have some stepper code here but i am confusing the if (Motor_Steps--) statement so help me for understanding this code

BOOL Pulse_Motor(void)
{
if(State)
{
GPIO_PORTE_DATA_R = MOTOR_STEP_OUT;
State = 0;
}
else
{
GPIO_PORTE_DATA_R = 0;
State = 1;
Step_Table_Index++;
}

if (Motor_Steps--)
{
// Set next match value
TIMER0_MATCHR_R = TIMER0_TC_R+Motor_deltaTimer_Value;
}
else
{
Motor_Stop();

}
return 0;..................................is it right?
}

if any wrg then suggest plz...
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stepper motor code for cortex ARM help...

embed_v

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ZASto

Advanced Member level 3

alexan_e

Administrator

jeffy665

Newbie level 4

Similar threads

Code C - [expand]
1 2	++x; --x; // pre-increment/pre-decrement operation (changed before evaluation) x++; x--; // post-increment/post-decrement operation (changed after evaluation)

stepper motor code for cortex ARM help...

embed_v

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ZASto

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alexan_e

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jeffy665

Newbie level 4

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