Cantafford
Member
Hello,
I'm working on a project controlling a bldc motor(just a simulation). I'm having problems when I try to reverse it's direction.
This is the schematic from proteus:
The forward phase sequence that I used to drive the motor CW is:
CB-AB-AC-BC-BA-CA and the motor runs fine in the forward direction. This is the code:
Notice the starting sequence(that makes the motor run CW):
Now I want to reverse the direction of the motor so the phase sequences should be:
BC, BA, CA, CB, AB, AC
So I tried using this starting sequence(to make the motor run CCW):
However my motor does not start CCW it still starts CW.
What am I doing wrong? Thanks for reading.
I'm working on a project controlling a bldc motor(just a simulation). I'm having problems when I try to reverse it's direction.
This is the schematic from proteus:
The forward phase sequence that I used to drive the motor CW is:
CB-AB-AC-BC-BA-CA and the motor runs fine in the forward direction. This is the code:
Code:
#include <stdio.h>
#include <stdlib.h>
#include "header.h"
int HALL;
int HALLvalue[6] = { 0b00000101, 0b00000001, 0b00000011, 0b00000010, 0b00000110, 0b00000100 };
int direction;
unsigned int dch;
unsigned int dcl;
// Capture Interrupt Service Routine
void interrupt CheckHallValue()
{
IC1IF = 0; IC2QEIF = 0; IC3DRIF = 0;
HALL = (PORTA >> 2) & 0x7; // read the capture pins to get hall directionor state
if(HALL == HALLvalue[0]) { OVDCOND = 0b00100100; PDC2H = 0xFF; PDC2L = 0xFF; PDC1H = 0xFF; PDC1L = 0xFF; }
else if(HALL == HALLvalue[1]) { OVDCOND = 0b00000110; PDC1H = 0xFF; PDC1L = 0xFF; PDC0H = 0xFF; PDC0L = 0xFF; } //
else if(HALL == HALLvalue[2]) { OVDCOND = 0b00010010; PDC2H = 0xFF; PDC2L = 0xFF; PDC0H = 0xFF; PDC0L = 0xFF; } //
else if(HALL == HALLvalue[3]) { OVDCOND = 0b00011000; PDC2H = 0xFF; PDC2L = 0xFF; PDC1H = 0xFF; PDC1L = 0xFF; } //
else if(HALL == HALLvalue[4]) { OVDCOND = 0b00001001; PDC1H = 0xFF; PDC1L = 0xFF; PDC0H = 0xFF; PDC0L = 0xFF; } //
else if(HALL == HALLvalue[5]) { OVDCOND = 0b00100001; PDC2H = 0xFF; PDC2L = 0xFF; PDC0H = 0xFF; PDC0L = 0xFF; } //
}
void ConfigureADC()
{
ADCON0 = 0b00000000; // single shot mode, single channel mode
VCFG1 = 0; // VDD and VSS as ref
VCFG0 = 0;
ADCON2 = 0b00001000; // left justified, 2TAD, conversion clock: Fosc/2
ADCON3 = 0b11000100; // input capture 1 starts the a/d sequence!!(check here the first two bits)
GASEL1 = 0; // select AN0
GASEL0 = 0;
ANSEL0 = 0b00000001;
}
void main()
{
//OSCCON = 0b01001111; // frequency is 1Mhz
ConfigureADC();
SCS1 = 0; // use primary
SCS0 = 0; // oscillator
TRISA = 0b11111111; // PORTA is input(CAP's + POT)
TRISB = 0b11000000;
TRISC = 0b10000000;
GIE = 1; // enable global interrupts
GIEH = 1;
PEIE = 1;
// Initialize the Input Capture Module
CAP1CON = 0b00000000; // disable input capture 1 module
CAP1CON = 0b00001000; // enable input capture 1 module; interrupt on every state change
CAP2CON = 0b00000000; // disable input capture 2 module
CAP2CON = 0b00001000; // enable input capture 2 module; interrupt on every state change
CAP3CON = 0b00000000; // disable input capture 3 module
CAP3CON = 0b00001000; // enable input capture 3 module; interrupt on every state change
// Enable Capture Interrupt and configure TMR5
IC1IE = 1; // enable IC1 interrupt
IC1IP = 1; // IC1 interrupt on high priority
IC1IF = 0; // clear IC1 interrupt status flag
IC2QEIE = 1; // enable IC2 interrupt
IC2QEIP = 1; // IC2 interrupt on high priority
IC2QEIF = 0; // clear IC2 interrupt status flag
IC3DRIE = 1; // enable IC3 interrupt
IC3DRIP = 1; // IC3 interrupt on high priority
IC3DRIF = 0; // clear IC3 interrupt status flag
PTCON0 = 0b00000000; // 1:1 postscale, 1:1 prescale, PWM in free-running mode
PTCON1 = 0b10000000; // pwm time base is on, the time base counts up
PWMCON0 = 0b01001111; // pwm0-5 configured as pwm output in independent mode
SEVOPS3 = 0; // 1:1 postscale
SEVOPS2 = 0;
SEVOPS1 = 0;
SEVOPS0 = 0;
OSYNC = 1; //Output overrides via the OVDCON register are synchronized to the PWM time base(NOT SURE HERE)
PTPERH = 0x0F; // frequency is 1.5Khz
PTPERL = 0xFF; // 0xFF here
//T5SYNC = 0;
//T5CON = 0b01011001;
//TMR5CS = 0;
T5CON = 0b00000101;
//LATB = 0b00100100; // in order to start input capture must see a change
OVDCOND = 0b00100100; // start sequence
PDC2H = 0x0F; PDC2L = 0x0F; PDC1H = 0x0F; PDC1L = 0x0F;
OVDCONS = 0;
while(1)
{
ADON = 1; // keep getting ADC value
}
}Notice the starting sequence(that makes the motor run CW):
Code:
OVDCOND = 0b00100100; // start sequence
PDC2H = 0x0F; PDC2L = 0x0F; PDC1H = 0x0F; PDC1L = 0x0F; // Phase B to negative, phase C to positive, Phase A not connected
OVDCONS = 0;Now I want to reverse the direction of the motor so the phase sequences should be:
BC, BA, CA, CB, AB, AC
So I tried using this starting sequence(to make the motor run CCW):
Code:
OVDCOND = 0b00011000; // start sequence
PDC2H = 0x0F; PDC2L = 0x0F; PDC1H = 0x0F; PDC1L = 0x0F; // Phase B to positive, phase C to negative, Phase A not connected
OVDCONS = 0;However my motor does not start CCW it still starts CW.
What am I doing wrong? Thanks for reading.