PIC32MX: PWM Motor Control - Revision history

Andrew Long: /* Associated Circuitry */

2010-04-16T04:39:01Z

Associated Circuitry

2010-04-16T04:38:15Z

Associated Circuitry

2010-04-16T04:33:18Z

2010-04-16T04:33:01Z

Bidirectional Motor Code

2010-04-16T04:31:43Z

Timer Interrupt Code

2010-04-16T04:30:31Z

Bidirectional Motor Code

2010-04-16T04:30:24Z

Bidirectional Motor Code

2010-04-16T04:30:09Z

Bidirectional Motor Code

2010-04-16T04:25:19Z

Timer Interrupt Code

2010-04-16T04:22:54Z

Associated Circuitry

← Older revision		Revision as of 04:39, 16 April 2010
Line 375:		Line 375:
	=== Associated Circuitry ===		=== Associated Circuitry ===

	This [[~~Image~~:PIC32_MotorCircuit.pdf\|pdf]] is the circuit using the L298 H-bridge.		This [[Media:PIC32_MotorCircuit.pdf\|pdf]] is the circuit using the L298 H-bridge.

← Older revision		Revision as of 04:38, 16 April 2010
Line 374:		Line 374:

	=== Associated Circuitry ===		=== Associated Circuitry ===

			This [[Image:PIC32_MotorCircuit.pdf\|pdf]] is the circuit using the L298 H-bridge.

@@ Line 245: / Line 245: @@
 ==Bidirectional Motor Code==
+This example code extends the ramp example for bidirectional control of a motor using an H-bridge.
  /********************************************************************
  Simple PWM example for bidirectional motor control with H-bridge.
@@ Line 370: / Line 372: @@
  	mT2ClearIntFlag();
  } // T2 Interrupt
+== Associated Circuitry ==

@@ Line 179: / Line 179: @@
  unsigned int Pwm; // variable to store calculated PWM value
  unsigned int Mode = 0; // variable to determine ramp up or ramp down
+ # define MAX_DUTY               3999
  int main(void)
@@ Line 192: / Line 194: @@
  	// init Timer2 mode and period (PR2) (frequency of 1 / 20 kHz = (3999 + 1) / 80MHz * 1
- 	OpenTimer2( T2_ON | T2_PS_1_1 | T2_SOURCE_INT, 0x0FA0);
+ 	OpenTimer2( T2_ON | T2_PS_1_1 | T2_SOURCE_INT, MAX_DUTY);
  	mT2SetIntPriority( 7); 	// set Timer2 Interrupt Priority
@@ Line 209: / Line 211: @@
  	if ( Mode )
  	{
- 		if ( Pwm <= 0xFFFF ) // ramp up mode
+ 		if ( Pwm <= MAX_DUTY ) // ramp up mode
   		{
  			Pwm ++; // If the duty cycle is not at max, increase

@@ Line 265: / Line 265: @@
  #define ENABLE_PIN			LATCbits.LATC1
  #define DIRECTION_PIN		LATCbits.LATC2
  #define MAX_DUTY               3999

@@ Line 265: / Line 265: @@
  #define ENABLE_PIN			LATCbits.LATC1
  #define DIRECTION_PIN		LATCbits.LATC2
+ #define MAX_DUTY               3999
  unsigned int Pwm; // variable to store calculated PWM value
@@ Line 291: / Line 293: @@
  	OpenOC1( OC_ON | OC_TIMER2_SRC | OC_PWM_FAULT_PIN_DISABLE, 0, 0);
- 	// init Timer2 mode and period (PR2)
+ 	// init Timer2 mode and period (PR2) 20 kHz freq ( 1 / 20 kHz = (3999 + 1) / 80MHz * 1
- 	OpenTimer2( T2_ON | T2_PS_1_1 | T2_SOURCE_INT, 0xFFFF);
+ 	OpenTimer2( T2_ON | T2_PS_1_1 | T2_SOURCE_INT, MAX_DUTY);
  	mT2SetIntPriority( 7); 	// set Timer2 Interrupt Priority
@@ Line 314: / Line 316: @@
  	if ( Mode )
  	{
- 		if ( Pwm <= 0xFFFF ) // ramp up mode
+ 		if ( Pwm <= MAX_DUTY ) // ramp up mode
  		{
  			mLED_1_On();
@@ Line 329: / Line 331: @@
  				mLED_0_On();
  				//SetDCOC1PWM(Pwm);
- 				SetDCOC1PWM(~Pwm & 0xFFFF);
+ 				SetDCOC1PWM(MAX_DUTY - Pwm);
  			}
  		}
@@ Line 353: / Line 355: @@
  				mLED_0_Off();
  				//SetDCOC1PWM(Pwm);
- 				SetDCOC1PWM(~Pwm & 0xFFFF);
+ 				SetDCOC1PWM(MAX_DUTY - Pwm);
  			}
  		}