SPWM

Projects Programming
1

I came across a good website and found out a nice program about inverter I understand how the program flow a little bit. What I don't know is how am I going to convert this into arduino code. This is the code:

//----------------------------------------------------------------------------------------
//Programmer: Syed Tahmid Mahbub
//Target Microcontroller: ATMEGA16
//Compiler: mikroC PRO for AVR (Can easily port to any other compiler)
//-----------------------------------------------------------------------------------------  


unsigned int sin_table[32]={0, 100, 199, 296, 390, 480, 566, 645, 718, 
783, 840, 889, 928, 958, 979, 989, 989, 979, 958, 928, 889, 840, 783,
 718, 645, 566, 480, 390, 296, 199, 100,0};

#define MOSA PORTD0_bit
#define MOSB PORTD1_bit
#define MOSC PORTD2_bit
#define MOSD PORTD3_bit

unsigned char FlagReg;
#define Direction FlagReg.B0
//0 -> MOS A + D
//1 -> MOS B + C

unsigned int TBL_POINTER_NEW, TBL_POINTER_OLD, TBL_POINTER_SHIFT, SET_FREQ;
unsigned int TBL_temp;
unsigned char DUTY_CYCLE;

void interrupt() org IVT_ADDR_TIMER1_OVF{
     TBL_POINTER_NEW = TBL_POINTER_NEW + SET_FREQ;
         if (TBL_POINTER_NEW < TBL_POINTER_OLD){
           if (Direction == 0){
              MOSA = 0;
              MOSD = 0;
              MOSB = 1;
              MOSC = 1;
              Direction = 1;
           }
           else{
                MOSB = 0;
                MOSC = 0;
                MOSA = 1;
                MOSD = 1;
                Direction = 0;
           }
        }
        TBL_POINTER_SHIFT = TBL_POINTER_NEW >> 11;
        DUTY_CYCLE = TBL_POINTER_SHIFT;
        TBL_POINTER_SHIFT = sin_table[DUTY_CYCLE];
        OCR1AH = TBL_POINTER_SHIFT >> 8;
        OCR1AL = TBL_POINTER_SHIFT & 0x0F;
        TBL_POINTER_OLD = TBL_POINTER_NEW;
}

void main() {
     SET_FREQ = 410;
     TBL_POINTER_SHIFT = 0;
     TBL_POINTER_NEW = 0;
     TBL_POINTER_OLD = 0;
     DUTY_CYCLE = 0;
     DDRC = 0xFF;
     DDRD = 0XFF;
     OCR1AH = 0;
     OCR1AL = 0;
     TCCR1A = 0x82;
     ICR1H = 0x03;
     ICR1L = 0xE7;
     //ICR1 = 999 -> TOP -> 16kHz
     TIMSK = 0x04;
     TCCR1B = 0x19;
     SREG_I_bit = 1;
     while(1);
}

I'm totally noob in programming. much of my projects are just copy paste and modify a small portion of the code.
(to moderator, If i'm posting in wrong section please kindly delete this. :frowning: )
any help will be much appreciated. :wink: thank you.

Moderator edit: Code tags. { sigh }

2

Something close to this for Arduino:

//----------------------------------------------------------------------------------------
//Programmer: Syed Tahmid Mahbub
//Target Microcontroller: ATMEGA16
//Compiler: mikroC PRO for AVR (Can easily port to any other compiler)
//----------------------------------------------------------------------------------------- 

// Revised for Arduino by CrossRoads

#define MOSA PORTD0_bit
#define MOSB PORTD1_bit
#define MOSC PORTD2_bit
#define MOSD PORTD3_bit
#define Direction FlagReg.B0

unsigned int sin_table[32]={0, 100, 199, 296, 390, 480, 566, 645, 718, 
783, 840, 889, 928, 958, 979, 989, 989, 979, 958, 928, 889, 840, 783,
718, 645, 566, 480, 390, 296, 199, 100,0};

unsigned char FlagReg;

//0 -> MOS A + D
//1 -> MOS B + C
byte MOSA;
byte MOSB
byte MOSC;
byte MOSD;

unsigned int TBL_POINTER_NEW = 0;
unsigned int TBL_POINTER_OLD = 0
unsigned int TBL_POINTER_SHIFT = 0
unsigned int SET_FREQ = 410;
unsigned int TBL_temp;
unsigned char DUTY_CYCLE = 0;

// DDRx bits = 1 indicate outputs
DDRC = 0xFF; // data direction register PORTC = D14,15,16,17,18,19 - 20,21 not available
DDRD = 0XFF; // data direction register PORTD = D0,1,2,3,4,5,6,7 on a '328P Arduino

// set up timers, interrupt mask - may need tweaking here still:
OCR1AH = 0;
OCR1AL = 0;
TCCR1A = 0x82;
ICR1H = 0x03;
ICR1L = 0xE7;
//ICR1 = 999 -> TOP -> 16kHz
TIMSK = 0x04;
TCCR1B = 0x19;
SREG_I_bit = 1;

void setup(){
}
void loop(){
}
// All the action happens in the interrupt:

void interrupt() org IVT_ADDR_TIMER1_OVF{             <<< This line needs fixing - what is "org"?

TBL_POINTER_NEW = TBL_POINTER_NEW + SET_FREQ;
if (TBL_POINTER_NEW < TBL_POINTER_OLD){
if (Direction == 0){
MOSA = 0;
MOSD = 0;
MOSB = 1;
MOSC = 1;
Direction = 1;
}
else{
MOSB = 0;
MOSC = 0;
MOSA = 1;
MOSD = 1;
Direction = 0;
}
}
TBL_POINTER_SHIFT = TBL_POINTER_NEW >> 11;
DUTY_CYCLE = TBL_POINTER_SHIFT;
TBL_POINTER_SHIFT = sin_table[DUTY_CYCLE];
OCR1AH = TBL_POINTER_SHIFT >> 8;
OCR1AL = TBL_POINTER_SHIFT & 0x0F;
TBL_POINTER_OLD = TBL_POINTER_NEW;
}
3

thank you for your reply... i'll try it if it will work. thank you so much. :slight_smile:

4

about this line

void interrupt() org IVT_ADDR_TIMER1_OVF{ <<< This line needs fixing - what is "org"?

i feel its like PIC thing.. i always see org in there code but dont know its function

5

Look up interrupts at the Reference page.
You need to fix the syntax of the interrupt service routine, where I had the question about "org".

6

Org is used in mikroC to notify the compiler of the specific interrupt vector. In this case, it means that this is the ISR for the Timer 1 interrupt.