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[AVR] SPI code generating weird behaviour

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samir82show

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Hi, I'm Samir
I finished coding SPI control of three servo motors, two of them are connected to the first micro, the third is connected to the second micro.
My problem is there is specific variable unsigned char state = 0; has to be exist and initialized otherwise the Slave code doesn't run.

attached the proteus image of connectivity and the code below

Master Code http://pastebin.com/EHSsMsnr

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/*****************************************************
This program was produced by the
CodeWizardAVR V2.05.0 Professional
Automatic Program Generator
© Copyright 1998-2010 Pavel Haiduc, HP InfoTech s.r.l.
[url]http://www.hpinfotech.com[/url]
 
Project : 
Version : 
Date    : 1/20/2014
Author  : NeVaDa
Company : 
Comments: 
 
 
Chip type               : ATmega32
Program type            : Application
AVR Core Clock frequency: 1.000000 MHz
Memory model            : Small
External RAM size       : 0
Data Stack size         : 512
*****************************************************/
 
#include <mega32.h>
 
// SPI functions
#include <spi.h>
#define MAXANGLE 1999
#define MINANGLE 999
#define MOTOR_PLUS  0x08
#define MOTOR_MINUS 0x04 
unsigned int Press_Conf = 0;
void main(void)
{
    // Declare your local variables here
 
    // Input/Output Ports initialization
    // Port A initialization
    // Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In 
    // State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T 
    PORTA=0x00;
    DDRA=0x00;
 
    // Port B initialization
    // Func7=Out Func6=In Func5=Out Func4=Out Func3=In Func2=In Func1=In Func0=In 
    // State7=0 State6=T State5=0 State4=0 State3=T State2=T State1=T State0=T 
    PORTB=0x00;
    DDRB=0xB0;
 
    // Port C initialization
    // Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In 
    // State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T 
    PORTC=0xFE;
    DDRC=0x01;
 
    // Port D initialization
    // Func7=In Func6=In Func5=Out Func4=Out Func3=In Func2=In Func1=In Func0=In 
    // State7=T State6=T State5=0 State4=0 State3=T State2=T State1=T State0=T 
    PORTD=0x00;
    DDRD=0x30;
 
    // Timer/Counter 0 initialization
    // Clock source: System Clock
    // Clock value: Timer 0 Stopped
    // Mode: Normal top=0xFF
    // OC0 output: Disconnected
    TCCR0=0x00;
    TCNT0=0x00;
    OCR0=0x00;
 
    // Timer/Counter 1 initialization
    // Clock source: System Clock
    // Clock value: Timer1 Stopped
    // Mode: Fast PWM top=ICR1
    // OC1A output: Non-Inv.
    // OC1B output: Non-Inv.
    // Noise Canceler: Off
    // Input Capture on Falling Edge
    // Timer1 Overflow Interrupt: Off
    // Input Capture Interrupt: Off
    // Compare A Match Interrupt: Off
    // Compare B Match Interrupt: Off
    TCCR1A=0xA2;
    TCCR1B=0x19;
    TCNT1H=0x00;
    TCNT1L=0x00;
    ICR1H=0x4E;
    ICR1L=0x1F;
    OCR1AH=0x03;
    OCR1AL=0xE7;
    OCR1BH=0x03;
    OCR1BL=0xE7;
 
    // Timer/Counter 2 initialization
    // Clock source: System Clock
    // Clock value: Timer2 Stopped
    // Mode: Normal top=0xFF
    // OC2 output: Disconnected
    ASSR=0x00;
    TCCR2=0x00;
    TCNT2=0x00;
    OCR2=0x00;
 
    // External Interrupt(s) initialization
    // INT0: Off
    // INT1: Off
    // INT2: Off
    MCUCR=0x00;
    MCUCSR=0x00;
 
    // Timer(s)/Counter(s) Interrupt(s) initialization
    TIMSK=0x00;
 
    // USART initialization
    // USART disabled
    UCSRB=0x00;
 
    // Analog Comparator initialization
    // Analog Comparator: Off
    // Analog Comparator Input Capture by Timer/Counter 1: Off
    ACSR=0x80;
    SFIOR=0x00;
 
    // ADC initialization
    // ADC disabled
    ADCSRA=0x00;
 
    // SPI initialization
    // SPI Type: Master
    // SPI Clock Rate: 250.000 kHz
    // SPI Clock Phase: Cycle Start
    // SPI Clock Polarity: Low
    // SPI Data Order: MSB First
    SPCR=0x50;
    SPSR=0x00;
 
    // TWI initialization
    // TWI disabled
    TWCR=0x00;
 
    while (1)
    {
      // Place your code here
        if(PINC.7 == 0)
        {
            Press_Conf++;
            if(Press_Conf >= 500)
            {
                if(OCR1A < MAXANGLE)
                {
                    OCR1A = OCR1A + 1;
                    PORTC ^= 1 << PINC0;
                }
                Press_Conf = 0;           
            }
        }
        else if(PINC.6 == 0)
        {
            Press_Conf++;
            if(Press_Conf >= 500)
            {
                if(OCR1A > MINANGLE)
                {
                    OCR1A = OCR1A - 1;
                    PORTC ^= 1 << PINC0;
                }
                Press_Conf = 0;
            }          
        }
        else if(PINC.5 == 0)
        {
            Press_Conf++;
            if(Press_Conf >= 500)
            {
                if(OCR1B < MAXANGLE)
                {
                    OCR1B = OCR1B + 1;
                    PORTC ^= 1 << PINC0;
                }
                Press_Conf = 0;
            }          
        }
        else if(PINC.4 == 0)
        {
            Press_Conf++;
            if(Press_Conf >= 500)
            {
                if(OCR1B > MINANGLE)
                {
                    OCR1B = OCR1B - 1;
                    PORTC ^= 1 << PINC0;
                }
                Press_Conf = 0;           
            }
        }
        else if(PINC.3 == 0)
        {
            Press_Conf++;
            if(Press_Conf >= 500) 
            {
                spi(MOTOR_PLUS);         
                Press_Conf = 0;
            }
        }
        else if(PINC.2 == 0)
        {
            Press_Conf++;
            if(Press_Conf >= 500)
            {
                spi(MOTOR_MINUS);
                Press_Conf = 0;
            }
        }
    }
}


Slave Code http://pastebin.com/3XvfCtkh

Code C - [expand]
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/*****************************************************
This program was produced by the
CodeWizardAVR V2.05.0 Professional
Automatic Program Generator
© Copyright 1998-2010 Pavel Haiduc, HP InfoTech s.r.l.
[url]http://www.hpinfotech.com[/url]
 
Project : 
Version : 
Date    : 1/20/2014
Author  : NeVaDa
Company : 
Comments: 
 
 
Chip type               : ATmega32
Program type            : Application
AVR Core Clock frequency: 1.000000 MHz
Memory model            : Small
External RAM size       : 0
Data Stack size         : 512
*****************************************************/
 
#include <mega32.h>
#define MOTOR_PLUS  0x08
#define MOTOR_MINUS 0x04 
#define MAXANGLE 1999
#define MINANGLE 999
unsigned char data;
unsigned char state = 0;
 
// SPI interrupt service routine
interrupt [SPI_STC] void spi_isr(void)
{
    data=SPDR;
}
 
// Declare your global variables here
 
void main(void)
{
    // Declare your local variables here
 
    // Input/Output Ports initialization
    // Port A initialization
    // Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In 
    // State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T 
    PORTA=0x00;
    DDRA=0x00;
 
    // Port B initialization
    // Func7=In Func6=Out Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In 
    // State7=T State6=0 State5=T State4=T State3=T State2=T State1=T State0=T 
    PORTB=0x00;
    DDRB=0x40;
 
    // Port C initialization
    // Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In 
    // State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T 
    PORTC=0x00;
    DDRC=0x00;
 
    // Port D initialization
    // Func7=In Func6=In Func5=Out Func4=Out Func3=In Func2=In Func1=In Func0=In 
    // State7=T State6=T State5=0 State4=0 State3=T State2=T State1=T State0=T 
    PORTD=0x00;
    DDRD=0xB0;
 
    // Timer/Counter 0 initialization
    // Clock source: System Clock
    // Clock value: Timer 0 Stopped
    // Mode: Normal top=0xFF
    // OC0 output: Disconnected
    TCCR0=0x00;
    TCNT0=0x00;
    OCR0=0x00;
 
    // Timer/Counter 1 initialization
    // Clock source: System Clock
    // Clock value: Timer1 Stopped
    // Mode: Fast PWM top=ICR1
    // OC1A output: Non-Inv.
    // OC1B output: Non-Inv.
    // Noise Canceler: Off
    // Input Capture on Falling Edge
    // Timer1 Overflow Interrupt: Off
    // Input Capture Interrupt: Off
    // Compare A Match Interrupt: Off
    // Compare B Match Interrupt: Off
    TCCR1A=0xA2;
    TCCR1B=0x19;
    TCNT1H=0x00;
    TCNT1L=0x00;
    ICR1H=0x4E;
    ICR1L=0x1F;
    OCR1AH=0x03;
    OCR1AL=0xE7;
    OCR1BH=0x00;
    OCR1BL=0x00;
 
    // Timer/Counter 2 initialization
    // Clock source: System Clock
    // Clock value: Timer2 Stopped
    // Mode: Normal top=0xFF
    // OC2 output: Disconnected
    ASSR=0x00;
    TCCR2=0x00;
    TCNT2=0x00;
    OCR2=0x00;
 
    // External Interrupt(s) initialization
    // INT0: Off
    // INT1: Off
    // INT2: Off
    MCUCR=0x00;
    MCUCSR=0x00;
 
    // Timer(s)/Counter(s) Interrupt(s) initialization
    TIMSK=0x00;
 
    // USART initialization
    // USART disabled
    UCSRB=0x00;
 
    // Analog Comparator initialization
    // Analog Comparator: Off
    // Analog Comparator Input Capture by Timer/Counter 1: Off
    ACSR=0x80;
    SFIOR=0x00;
 
    // ADC initialization
    // ADC disabled
    ADCSRA=0x00;
 
    // SPI initialization
    // SPI Type: Slave
    // SPI Clock Phase: Cycle Start
    // SPI Clock Polarity: Low
    // SPI Data Order: MSB First
    SPCR=0xC0;
    SPSR=0x00;
 
    // Clear the SPI interrupt flag
    #asm
        in   r30,spsr
        in   r30,spdr
    #endasm
 
    // TWI initialization
    // TWI disabled
    TWCR=0x00;
 
    // Global enable interrupts
    #asm("sei")
 
    while (1)
    {
        // Place your code here
        if(data == MOTOR_PLUS)
        {
            if(OCR1A < MAXANGLE)
            {
                OCR1A = OCR1A + 1;
                PORTD ^= 1 << PIND7;
                data = 0x00;
            }
        }
        else if(data == MOTOR_MINUS)
        {
            if(OCR1A > MINANGLE)
            {
                OCR1A = OCR1A - 1;
                PORTD ^= 1 << PIND7;
                data = 0x00;
                    }
            }
        }
}


thanks
 
Last edited by a moderator:

Hey Samir....!
wher have you used that variable called state in both the programs...
I could just find "state" mentioned in comments alone
 

ragul07 said:
Hey Samir....!
wher have you used that variable called state in both the programs...
I could just find "state" mentioned in comments alone
Click to expand...
exactly, the problem I'm not referencing or assign it to any value, I can even rename it to any other name, but it has to be existing and initiated.
 

samir82show said:
I can even rename it to any other name, but it has to be existing and initiated.
Click to expand...

You mean u can rename the variable state into someother????
Or do u mean u can change the name statex in those comments???

Since its a kinda auto generated code check in those function if there exits any variable with same name..!
 

ragul07 said:
You mean u can rename the variable state into someother????
Or do u mean u can change the name statex in those comments???

Since its a kinda auto generated code check in those function if there exits any variable with same name..!
Click to expand...

I meant I have to have a variable and initiated, no matter the name was, putting unsigned char a; and the code will run perfectly.
 

Just try to simulate your code....! connect a spi debugger and check if u recieve desired values
 
Hi Ragul,
after debugging the SPI I found out whenever I add the above variable will cause the master to send the indicated value (multiplied by 2), thus sending 0x04 will be received 0x08 and 0x08 received 0x10 and the code runs perfectly, and whenever I remove the variable the transmitted value is correct, 0x04 will be received 0x04, and 0x08 will be received 0x08 but the code doesn't run and I can not control the motor further.

ragul07 said:
Just try to simulate your code....! connect a spi debugger and check if u recieve desired values
Click to expand...
 

hey samir.. can u send me the routines for "spi.h"
il just check it up :)
 

sorry couldn't know how to attach spi.h and spi.lib below links for them
spi.h **broken link removed**
spi.lib **broken link removed**


ragul07 said:
hey samir.. can u send me the routines for "spi.h"
il just check it up :)
Click to expand...
 

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