stream.c File Reference

Stream for the communcation mode of HvA-Xmegaboard. More...

#include <avr/io.h>
#include "stream.h"
#include "uart.h"

Macros
#define	ENABLE_UART_F0   1
	UART0 from PORTF.
#define	BAUD   115200
	baud rate
#define	CLK2X   0
	no double clock speed

Functions
int	uart_fputc (char c, FILE *stream)
	Write a byte to the circular transmit buffer. This function is necessary for a standard stream. More...
int	uart_fgetc (FILE *stream)
	Get a byte from the circular receive buffer This function is necessary for a standard stream. More...
void	init_stream (uint32_t fcpu)
	Initialize a standard in/out stream It uses USART0 of port F, the baud rate is BAUD, doubleclockspeed is CLK2X and the interruptlevel is low The global interrupt is not yet set. More...

Variables
FILE	uart_stdinout = FDEV_SETUP_STREAM(uart_fputc, uart_fgetc, _FDEV_SETUP_RW)
	FILE structure for standard streams.

Detailed Description

Stream for the communcation mode of HvA-Xmegaboard.

Author

Wim Dolman (w.e.dolman@hva.nl)

Date

03-10-2016

Version

1.4

Makes a standard stream for the HvA-Xmegaboard. It is build on the wrapper. With these you can use printf and scanf to write to and read from the UART F0. The baud rate is 115200 and the protocol is 8N1.

Version 1.3 : Modified uart_fputc changed. With a full TX-buffer it doesn't skips characters anymore. It now waits until there is free space in the buffer.

Version 1.4 : The baud rate is changed toe 115200

Function Documentation

void init_stream

(

uint32_t

fcpu

)

Initialize a standard in/out stream It uses USART0 of port F, the baud rate is BAUD, doubleclockspeed is CLK2X and the interruptlevel is low The global interrupt is not yet set.

Parameters

fcpu	the clock frequency

Returns

void

int uart_fgetc

(

FILE *

stream

)

Get a byte from the circular receive buffer This function is necessary for a standard stream.

Parameters

stream

file pointer

Returns

received byte from circulair buffer (low byte) or UART_NO_DATA if buffer is empty

int uart_fputc	(	char	c,
		FILE *	stream
	)

Write a byte to the circular transmit buffer. This function is necessary for a standard stream.

Parameters

c	character to be written
stream	file pointer

Returns

always zero