uart.c

this is the firmware usbn2mc for atmega32

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

#include "uart.h"



void UARTInit(void)
{
  //UCSRB |= (1<<TXEN);			// UART TX einschalten
  //UCSRC |= (1<<URSEL)|(3<<UCSZ0);	// Asynchron 8N1

	//UCSRB |= ( 1 << RXEN ); // RX aktivieren
	//UCSRB |= ( 1 << RXCIE ); // RX interrupt aktivieren

	//UCSRC = (1 << URSEL) | (1 << UCSZ1) | (1 << UCSZ0);
 	
	UCSRA = (1 << RXC) | (1 << TXC);
  UCSRB = (1 << RXEN) | (1 << TXEN) | (1 << RXCIE);
  UCSRC = (1 << URSEL) | (1 << UCSZ1) | (1 << UCSZ0);
	//ATmega32 bei 16MHz und f黵 19200 Baud
  UBRRH  = 0;                                   // Highbyte ist 0
  UBRRL  = 51;                                  // Lowbyte ist 51 ( dezimal )
    // Flush Receive-Buffer
  do
  {
      uint8_t dummy;
      (void) (dummy = UDR);
  }
  while (UCSRA & (1 << RXC));
}



void UARTPutChar(unsigned char sign)
{
  // bei neueren AVRs steht der Status in UCSRA/UCSR0A/UCSR1A, hier z.B. fuer ATmega16:
  while (!(UCSRA & (1<<UDRE))); /* warten bis Senden moeglich                   */
  	UDR = sign;                    /* schreibt das Zeichen x auf die Schnittstelle */
}


unsigned char UARTGetChar(void)
{
    while (!(UCSRA & (1<<RXC)));  // warten bis Zeichen verfuegbar
  return UDR;                   // Zeichen aus UDR an Aufrufer zurueckgeben
}

void UARTWrite(char* msg)
{
  while(*msg != '\0')
  {
     UARTPutChar (*msg++);
  }
}

unsigned char AsciiToHex(unsigned char high,unsigned char low)
{
  unsigned char new;

  // check if lower equal 9 ( assii 57 )
  if(high <= 57) // high is a number
    high = high -48;
  else // high is a letter
    high = high -87;

  high = high << 4;
  high = high & 0xF0;
 
  // check if lower equal 9 ( assii 57 )
  if(low <= 57) // high is a number
    low = low -48;
  else // high is a letter
    low = low -87;
  low = low & 0x0F;
 
  new = high | low;
 
  return new;
}

void SendHex(unsigned char hex)
{
  unsigned char high,low;
  // get highnibble
  high = hex & 0xF0;
  high = high >> 4;
 
  // get lownibble
  low = hex & 0x0F;
 
  if(high<=9)
    UARTPutChar(high+48);
  else
    UARTPutChar(high+87);
 
 
  if(low<=9)
    UARTPutChar(low+48);
  else
    UARTPutChar(low+87);

}