uart.c File Reference

Routines for serial Communication. More...

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Functions
void	CopyRbuf0ToCmdline (void)
int	hprintf_P (const char *fmt,...)
	printf_P for Communication with the Host More...
void	InitUart ()
	Initialize USART Hardware and Pointers. More...
	ISR (USART0_UDRE_vect)
	USART0 (Host-Interface) Data Register empty Interrupt. More...
	ISR (USART0_RX_vect)
	USART0 Receive-Interrupt (Host-Interface) More...
int	putc0 (char c)
	Puts a char to USART0 (Host-Interface) More...
int	putchar_uart0 (char c, FILE *stream)
	The Putchar-Routine for USART0 (Host-Interface) More...
void	Usart0FlushRx (void)

Variables
volatile uint8_t	byteFromHost
	Contains the last byte received from the host. More...
volatile uint8_t	cFlags
volatile char	cmdline [CMDLINE_MAX+1]
	Ready to hold CMDLINE_MAX chars plus terminating 0. More...
volatile uint8_t	hostCommandsLost
	Counts the number of commands lost due to buffer overrun. More...
static volatile char	rbuf0 [CMDLINE_MAX+1]
	Receive Buffer for UART0. More...
static volatile uint8_t	rbuf0_ptr
static volatile char	tbuf0 [UART0_TXBUFSIZE]
	Transmit Buffer for UART0. More...
volatile uint8_t	tbuf0_head
volatile uint8_t	tbuf0_tail
FILE	uart0 =FDEV_SETUP_STREAM(putchar_uart0,NULL,_FDEV_SETUP_WRITE)

Detailed Description

Routines for serial Communication.

Copyright

Copyright (C) 2009 Robert Loos http://www.loosweb.de

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Function Documentation

InitUart()

void InitUart

(

void

)

Initialize USART Hardware and Pointers.

2 Stop-bits are used, USART0 connects to the Host at 9600 baud, 8 bits and no parity.

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putc0()

int putc0

(

char

c

)

Puts a char to USART0 (Host-Interface)

Note

This routine blocks when the transmit buffer is full.

Parameters

c	The Character

Returns

Always 0

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putchar_uart0()

int putchar_uart0	(	char	c,
		FILE *	stream
	)

The Putchar-Routine for USART0 (Host-Interface)

Note

This routine blocks when the transmit buffer is full.

Parameters

c	The Character
stream	A Pointer to the File (unused)

Returns

Always 0

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ISR() [1/2]

ISR

(

USART0_UDRE_vect

)

USART0 (Host-Interface) Data Register empty Interrupt.

CopyRbuf0ToCmdline()

void CopyRbuf0ToCmdline

(

void

)

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ISR() [2/2]

ISR

(

USART0_RX_vect

)

USART0 Receive-Interrupt (Host-Interface)

This routine collects incoming characters until a complete host- or Bluetooth-command has been received.

Note

For Bluetooth, we ignore the high-byte of the length field. We cannot handle Telegrams bigger than the cmdline for now and the do also not appear until now.

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Usart0FlushRx()

void Usart0FlushRx

(

void

)

hprintf_P()

int hprintf_P	(	const char *	fmt,
			...
	)

printf_P for Communication with the Host

Parameters

fmt	Format String
...	Additional Parameters

Returns

The return value of the underlying vfprintf_P

Variable Documentation

cFlags

volatile uint8_t cFlags

tbuf0

volatile char tbuf0[UART0_TXBUFSIZE]

static

Transmit Buffer for UART0.

rbuf0

volatile char rbuf0[CMDLINE_MAX+1]

static

Receive Buffer for UART0.

tbuf0_tail

volatile uint8_t tbuf0_tail

tbuf0_head

volatile uint8_t tbuf0_head

rbuf0_ptr

volatile uint8_t rbuf0_ptr

static

byteFromHost

volatile uint8_t byteFromHost

Contains the last byte received from the host.

hostCommandsLost

volatile uint8_t hostCommandsLost

Counts the number of commands lost due to buffer overrun.

cmdline

volatile char cmdline[CMDLINE_MAX+1]

Ready to hold CMDLINE_MAX chars plus terminating 0.

uart0

FILE uart0 =FDEV_SETUP_STREAM(putchar_uart0,NULL,_FDEV_SETUP_WRITE)