uart.h File Reference

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Macros
#define	CMDLINE_MAX   20
#define	HOST_BAUD   115200
#define	HOST_UBRR   (F_CPU/16/HOST_BAUD-1)
#define	UART0_TXBUFSIZE   10
	Size of the UART0 transmit buffer. More...

Functions
static void	AssertRTS (void)
	Asserts RTS to the Host Line, i.e. allows the Host to send Data. More...
int	hprintf_P (const char *fmt,...)
	printf_P for Communication with the Host More...
void	InitUart (void)
	Initialize USART Hardware and Pointers. More...
int	putchar_uart0 (char, FILE *)
	The Putchar-Routine for USART0 (Host-Interface) More...
static void	ReleaseRTS (void)
	Releases RTS to the Host Line, i.e. stops the Host from sending Data. More...
void	Usart0FlushRx (void)
static void	UsartTimerCallback (void)
	Timer Callback. Checks for CTS from the Host to resume Communication. More...

Variables
volatile uint8_t	byteFromHost
	Contains the last byte received from the host. More...
static const uint8_t	CFLAG_BYTERECEIVED =32
	Received a Byte from the host. More...
static const uint8_t	CFLAG_CHECKSUMERROR =8
	Checksum Error in received Telegram. More...
static const uint8_t	CFLAG_CMDRECEIVED =16
	Received the terminating CR of a Command. More...
static const uint8_t	CFLAG_PARITYERROR =4
	Parity Error in received Byte. 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...
volatile uint8_t	tbuf0_head
volatile uint8_t	tbuf0_tail
FILE	uart0

Macro Definition Documentation

HOST_BAUD

#define HOST_BAUD   115200

HOST_UBRR

#define HOST_UBRR   (F_CPU/16/HOST_BAUD-1)

UART0_TXBUFSIZE

#define UART0_TXBUFSIZE   10

Size of the UART0 transmit buffer.

CMDLINE_MAX

#define CMDLINE_MAX   20

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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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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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

Usart0FlushRx()

void Usart0FlushRx

(

void

)

UsartTimerCallback()

static void UsartTimerCallback ( void  )

inlinestatic

Timer Callback. Checks for CTS from the Host to resume Communication.

This function re-enables interrupts after CTS becomes true again and must be called periodically e.g. from timer interrupt.

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AssertRTS()

static void AssertRTS ( void  )

inlinestatic

Asserts RTS to the Host Line, i.e. allows the Host to send Data.

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ReleaseRTS()

static void ReleaseRTS ( void  )

inlinestatic

Releases RTS to the Host Line, i.e. stops the Host from sending Data.

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Variable Documentation

cmdline

volatile char cmdline[CMDLINE_MAX+1]

Ready to hold CMDLINE_MAX chars plus terminating 0.

cFlags

volatile uint8_t cFlags

CFLAG_PARITYERROR

const uint8_t CFLAG_PARITYERROR =4

static

Parity Error in received Byte.

CFLAG_CHECKSUMERROR

const uint8_t CFLAG_CHECKSUMERROR =8

static

Checksum Error in received Telegram.

CFLAG_CMDRECEIVED

const uint8_t CFLAG_CMDRECEIVED =16

static

Received the terminating CR of a Command.

CFLAG_BYTERECEIVED

const uint8_t CFLAG_BYTERECEIVED =32

static

Received a Byte from the host.

tbuf0_tail

volatile uint8_t tbuf0_tail

tbuf0_head

volatile uint8_t tbuf0_head

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.

uart0

FILE uart0