Quote from Ulkizz on January 16, 2025, 7:31 am

As states above, function sprintf (and scanf) works incorrect.  Functions seems to work except for copying to destination buffer. The latter only an assumption.

Hex compiled in Microchip Studio 7 with avr-gcc.exe (AVR_8_bit_GNU_Toolchain_3.6.2_1778) 5.4.0

Target device ATMega128A

SimulIDE-1.1.0-SR1. Also true for RC1

 

The functions works correct on real device.

Sample code:

 

#define F_CPU 7372800L

#include <avr/io.h>
#include <stdio.h>


#include "util/delay.h"


void USART_INIT(unsigned int chNo, unsigned int Baud)
{
	unsigned int ubrr = F_CPU/16/Baud-1;
	
	UBRR0H = (unsigned char)(ubrr>>8);
	UBRR0L = (unsigned char)ubrr;
	
	UCSR0B = (1<<RXEN0)|(1<<TXEN0);
	UCSR0C = (1<<USBS0)|(3<<UCSZ00);
}

void USART_Transmit( unsigned char data )
{
	/* Wait for empty transmit buffer */
	while ( !( UCSR0A & (1<<UDRE0)) )
	;
	/* Put data into buffer, sends the data */
	UDR0 = data;
}

void USART_Transmit( unsigned char data[] )
{
	int i = 0;
while(data[i]!='\0')
{
	USART_Transmit(data[i]);
	i++;
}
}

void USART_Transmit( const char data[] )
{
	USART_Transmit((unsigned char*)data);
}


int main(void)
{
	USART_INIT(0,19200);
	char buffer[10];
	/* Replace with your application code */
    while (1) 
    {
		_delay_ms(1000);
		sprintf(buffer, "\r\nTest %d", 10);
		USART_Transmit(buffer);
		USART_Transmit('.');
    }
}

 

#define F_CPU 7372800L

#include <avr/io.h>
#include <stdio.h>


#include "util/delay.h"


void USART_INIT(unsigned int chNo, unsigned int Baud)
{
	unsigned int ubrr = F_CPU/16/Baud-1;
	
	UBRR0H = (unsigned char)(ubrr>>8);
	UBRR0L = (unsigned char)ubrr;
	
	UCSR0B = (1<<RXEN0)|(1<<TXEN0);
	UCSR0C = (1<<USBS0)|(3<<UCSZ00);
}

void USART_Transmit( unsigned char data )
{
	/* Wait for empty transmit buffer */
	while ( !( UCSR0A & (1<<UDRE0)) )
	;
	/* Put data into buffer, sends the data */
	UDR0 = data;
}

void USART_Transmit( unsigned char data[] )
{
	int i = 0;
while(data[i]!='\0')
{
	USART_Transmit(data[i]);
	i++;
}
}

void USART_Transmit( const char data[] )
{
	USART_Transmit((unsigned char*)data);
}


int main(void)
{
	USART_INIT(0,19200);
	char buffer[10];
	/* Replace with your application code */
    while (1) 
    {
		_delay_ms(1000);
		sprintf(buffer, "\r\nTest %d", 10);
		USART_Transmit(buffer);
		USART_Transmit('.');
    }
}