Serial Communication ATmega32 Codevision AVR

[Nadeera]

Re: Serial Communication ATmega32 Codevision AVR - My Code

Hi !

I am using Codevision AVR in one of my university projects and need to check the serial communication done through the PC and the ATMega32.

I want to send a specific data to ATMega32 and the ATMega32 should light perticular LEDs identifying the command.

I connected RS232 with the MAX 232 circuit and found out that the connection is ok and the MAX 232 is working properly.

But Im afraid I think that there is something wrong with the program.

Pls help me to solve the problem

I have attached my circuits schematic diagram and the code herewith.

Added after 3 minutes:

/*****************************************************
This program was produced by the
CodeWizardAVR V1.25.3 Standard
Automatic Program Generator
© Copyright 1998-2007 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com

Project :
Version :
Date : 4/22/2010
Author :
Company :
Comments:


Chip type : ATmega32
Program type : Application
Clock frequency : 16.000000 MHz
Memory model : Small
External SRAM size : 0
Data Stack size : 512
*****************************************************/

#include <mega32.h>
#include <delay.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

// I2C Bus functions
#asm
.equ __i2c_port=0x15 ;PORTC
.equ __sda_bit=1
.equ __scl_bit=0
#endasm
#include <i2c.h>
//#define SRF10_BUS_ADDRESS 0xF2
#define LCD03_BUS_ADDRESS 0xC6

#define RXB8 1
#define TXB8 0
#define UPE 2
#define OVR 3
#define FE 4
#define UDRE 5
#define RXC 7

#define FRAMING_ERROR (1<<FE)
#define PARITY_ERROR (1<<UPE)
#define DATA_OVERRUN (1<<OVR)
#define DATA_REGISTER_EMPTY (1<<UDRE)
#define RX_COMPLETE (1<<RXC)

// USART Receiver buffer
#define RX_BUFFER_SIZE 8
char rx_buffer[RX_BUFFER_SIZE];

#if RX_BUFFER_SIZE<256
unsigned char rx_wr_index,rx_rd_index,rx_counter;
#else
unsigned int rx_wr_index,rx_rd_index,rx_counter;
#endif

// This flag is set on USART Receiver buffer overflow
bit rx_buffer_overflow;

// USART Receiver interrupt service routine
interrupt [USART_RXC] void usart_rx_isr(void)
{
char status,data;
status=UCSRA;
data=UDR;
if ((status & (FRAMING_ERROR | PARITY_ERROR | DATA_OVERRUN))==0)
{
rx_buffer[rx_wr_index]=data;
if (++rx_wr_index == RX_BUFFER_SIZE) rx_wr_index=0;
if (++rx_counter == RX_BUFFER_SIZE)
{
rx_counter=0;
rx_buffer_overflow=1;
};
};
}

#ifndef _DEBUG_TERMINAL_IO_
// Get a character from the USART Receiver buffer
#define _ALTERNATE_GETCHAR_
#pragma used+
char getchar(void)
{
char data;
while (rx_counter==0);
data=rx_buffer[rx_rd_index];
if (++rx_rd_index == RX_BUFFER_SIZE) rx_rd_index=0;
#asm("cli")
--rx_counter;
#asm("sei")
return data;
}
#pragma used-
#endif



char indata;



initialize(){
// 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=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
PORTB=0x00;
DDRB=0xFF;

// 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=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
PORTD=0x00;
DDRD=0x00;

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Normal top=FFh
// OC0 output: Disconnected
TCCR0=0x00;
TCNT0=0x00;
OCR0=0x00;

// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer 1 Stopped
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer 1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
//ICR1H=0x00;
//ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;

// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer 2 Stopped
// Mode: Normal top=FFh
// 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;

// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;

// I2C Bus initialization
i2c_init();

}



void main(void)
{

initialize();



while (1)
{



while(rx_counter>0) // A command has been found
{

indata=getchar();

if (indata==1)
{
PORTB.0=0;
}
else if (indata==2)
{
PORTB.1=0;
}
else if (indata==3)
{
PORTB.2=0;
}
else if (indata==4)
{
PORTB.3=0;
}
else if (indata==5)
{
PORTB.4=0;
}
else if (indata==6)
{
PORTB.5=0;
}
else if (indata==7)
{
PORTB.6=0;
}
else if (indata==8)
{
PORTB.7=0;
}
}


}
}

 

[brucelee2]

Try Implementing it in a program such as Proteus. You can then simulate with a virtual terminal.....

 

[Nadeera]

Thanks. I have not worked with Proteous. Talking is not allowed. According to my knowledge Proteous only helps in identifying if any configuration fault. Isn't it ?

I will check it on. I guess the problem is with the code and not with the connections.

I face a difficulty in uploading my schematic diagram. Otherwise I could have uploaded the schematic diagram of the circuit.

 

[brucelee2]

Thanks. I have not worked with Proteous. Talking is not allowed. According to my knowledge Proteous only helps in identifying if any configuration fault. Isn't it ?

What do you mean ''Talking is not allowed.''?

 

[Nadeera]

Pls neglect that sentence. I said so because my knowledge about Proteous is very low. Somehow Im installing proteous now. Thanks again.

 

[brucelee2]

Oh ok. If you need help let me know. It quite easy to use. If you think i have been helpful please click 'helped' below.