uart.h File Reference

UART. More...

#include "main.h"
#include "../libs/uartlibrary/uart.h"

Defines
#define	UART_RX_BUFFER_SIZE   8
#define	UART_TX_BUFFER_SIZE   8
Functions
void	usart_init (void)
	initialises both USARTs
void	usart_off (void)
	switches off both USARTs
void	usart_baudrate (int8_t br)
	property: sets baudrate
void	usart_setSync (int8_t enable)
	property: enables synchronous communication
void	usart_stopBits (int8_t sb)
	property: sets the nr of stop bits
void	usart_dataBits (int8_t db)
	property: sets the nr of data bits

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Detailed Description

UART.

Serial communication.

Todo:

All the functions need to be completed.

Peter Fleury's lib?

ca 01 January 2006
Sven Kreiss

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Define Documentation

#define UART_RX_BUFFER_SIZE   8

#define UART_TX_BUFFER_SIZE   8

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Function Documentation

void usart_baudrate (  int8_t  br  )

property: sets baudrate { uint16_t reg = 0; //all values for 11.0592MHz oscillator if (br == 0) reg = 287; //2k4 else if(br == 1) reg = 143; //4k8 else if(br == 2) reg = 71; //9k6 else if(br == 3) reg = 47; //14k4 else if(br == 4) reg = 35; //19k2 else if(br == 5) reg = 23; //28k8 else if(br == 6) reg = 17; //38k4 else if(br == 7) reg = 11; //57k6 else if(br == 8) reg = 8; //76k8 else if(br == 9) reg = 5; //115k2 else if(br == 10) reg = 2; //230k4 UBRR0H = ((reg>>8) & 255); UBRR0L = reg & 255; UBRR1H = ((reg>>8) & 255); UBRR1L = reg & 255; // UBRR0H = 0; UBRR0L = 5; // UBRR1H = 0; UBRR1L = 5; }

void usart_dataBits (  int8_t  db  )

property: sets the nr of data bits { if (db == 0){ UCSR0C |= (0<<UCSZ0); UCSR1C |= (0<<UCSZ1); } //5bits else if(db == 1){ UCSR0C |= (1<<UCSZ0); UCSR1C |= (1<<UCSZ1); } //6bits else if(db == 2){ UCSR0C |= (2<<UCSZ0); UCSR1C |= (2<<UCSZ1); } //7bits else if(db == 3){ UCSR0C |= (3<<UCSZ0); UCSR1C |= (3<<UCSZ1); } //8bits else if(db == 4){ UCSR0C |= (15<<UCSZ0); UCSR1C |= (15<<UCSZ1); } //9bits }

void usart_init (  void   )

initialises both USARTs { //baudrate // UBRR0H = 0; UBRR0L = 0; // UBRR1H = 0; UBRR1L = 0; usart_baudrate(0); //erase data overflow flag UCSR0A &= ~(1<<DOR); UCSR1A &= ~(1<<DOR); //RXEN, TXEN, INTERRUPT ENABLE UCSR0B |= (1<<RXEN) | (1<<TXEN) | (1<<RXCIE); UCSR1B |= (1<<RXEN) | (1<<TXEN) | (1<<RXCIE); //2 stop bit, 8 data bit, synchronous mode // UCSR0C = (1<<USBS) | (3<<UCSZ0);// | (1<<UMSEL); // UCSR1C = (1<<USBS) | (3<<UCSZ0);// | (1<<UMSEL); usart_stopBits(1); usart_setSync(0); usart_dataBits(3); //activate internal PullUp for RX and XCK(if input) //DDRE = 255; PORTE |= (1<<PE0) | (1<<PE2); PORTD |= (1<<PD2) | (1<<PD5); uart_init(UART_BAUD_SELECT(9600, 11059200UL)); uart1_init(UART_BAUD_SELECT(9600, 11059200UL)); }

void usart_off (  void   )

switches off both USARTs { UCSR0B &= ~(1<<RXEN) & ~(1<<TXEN); UCSR1B &= ~(1<<RXEN) & ~(1<<TXEN); }

void usart_setSync (  int8_t  enable  )

property: enables synchronous communication { if(enable == 1){ //sync enabled UCSR0C |= (1<<UMSEL); UCSR1C |= (1<<UMSEL); } else if(enable == 0){ //sync disabled UCSR0C &= ~(1<<UMSEL); UCSR1C &= ~(1<<UMSEL); } }

void usart_stopBits (  int8_t  sb  )

property: sets the nr of stop bits { if(sb == 0){ //1 stop bit UCSR0C &= ~(1<<USBS); UCSR1C &= ~(1<<USBS); } else if(sb == 1){ //2 stop bits UCSR0C |= (1<<USBS); UCSR1C |= (1<<USBS); } }

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