Habe nun mein Problem gelöst. Ich kann nun mit AVRTerm ein String an
meinen Mega senden. Nun will ich diesen am LCD ausgeben. Doch der LCD
gibt mir nicht den ganzen string aus sondern nur immer die letzte
Ziffer.
#include <stdlib.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/signal.h>
#include <avr/pgmspace.h>
#include "lcd.h"
#include "uart.h"
/* define CPU frequency in Mhz here if not defined in Makefile */
#ifndef F_CPU
#define F_CPU 16000000UL
#endif
/* 9600 baud */
#define UART_BAUD_RATE 9600
int main(void)
{
lcd_init(LCD_DISP_ON);
unsigned int c;
char buffer[7];
int num=134;
/*
* Initialize UART library, pass baudrate and AVR cpu clock
* with the macro
* UART_BAUD_SELECT() (normal speed mode )
* or
* UART_BAUD_SELECT_DOUBLE_SPEED() ( double speed mode)
*/
uart_init( UART_BAUD_SELECT(UART_BAUD_RATE,F_CPU) );
/*
* now enable interrupt, since UART library is interrupt controlled
*/
sei();
/*
* Transmit string to UART
* The string is buffered by the uart library in a circular buffer
* and one character at a time is transmitted to the UART using
interrupts.
* uart_puts() blocks if it can not write the whole string to the
circular
* buffer
*/
uart_puts("String stored in SRAM\n");
/*
* Transmit string from program memory to UART
*/
uart_puts_P("String stored in FLASH\n");
/*
* Use standard avr-libc functions to convert numbers into string
* before transmitting via UART
*/
itoa( num, buffer, 10); // convert interger into string (decimal
format)
uart_puts(buffer); // and transmit string to UART
/*
* Transmit single character to UART
*/
uart_putc('\r');
for(;;)
{
/*
* Get received character from ringbuffer
* uart_getc() returns in the lower byte the received character
and
* in the higher byte (bitmask) the last receive error
* UART_NO_DATA is returned when no data is available.
*
*/
c = uart_getc();
if ( c & UART_NO_DATA )
{
/*
* no data available from UART
*/
}
else
{
/*
* new data available from UART
* check for Frame or Overrun error
*/
if ( c & UART_FRAME_ERROR )
{
/* Framing Error detected, i.e no stop bit detected */
uart_puts_P("UART Frame Error: ");
}
if ( c & UART_OVERRUN_ERROR )
{
/*
* Overrun, a character already present in the UART UDR
register was
* not read by the interrupt handler before the next
character arrived,
* one or more received characters have been dropped
*/
uart_puts_P("UART Overrun Error: ");
}
if ( c & UART_BUFFER_OVERFLOW )
{
/*
* We are not reading the receive buffer fast enough,
* one or more received character have been dropped
*/
uart_puts_P("Buffer overflow error: ");
}
/*
* send received character back
*/
/* put converted string to display */
lcd_clrscr();
lcd_putc( (unsigned char)c );
uart_putc( (unsigned char)c );
}
}
}
warum gibt mir die uart den ganzen String wieder und der LCD nur die
letzte Ziffer?