AT91 Debug Device

Debug output driver for AT91 On-Chip UART. More...

Collaboration diagram for AT91 Debug Device:

Functions
uint32_t	At91BaudRateDiv (uint32_t baud)
	Calculate divisor for a given baud rate.
int	At91DevDebugIOCtl (NUTDEVICE *dev, int req, void *conf)
	Handle I/O controls for debug device 2.
int	At91DevDebugWrite (NUTFILE *fp, const void *buffer, int len)
	Send characters to debug device 0.
NUTFILE *	At91DevDebugOpen (NUTDEVICE *dev, const char *name, int mode, int acc)
	Open debug device.
int	At91DevDebugClose (NUTFILE *fp)
	Close debug device.

---

Detailed Description

Debug output driver for AT91 On-Chip UART.

This stream device driver writes data to the internal UART. The output is unbuffered and uses polling. Therefore it can be used for standard I/O output even within interrupt routines.

---

Function Documentation

uint32_t At91BaudRateDiv

(

uint32_t

baud

)

Calculate divisor for a given baud rate.

Parameters:

baud	Baud rate.

Returns:

Calculated divisor.

References NUT_HWCLK_PERIPHERAL, and NutClockGet.

Referenced by At91DevDebugIOCtl().

int At91DevDebugIOCtl	(	NUTDEVICE *	dev,
		int	req,
		void *	conf
	)

Handle I/O controls for debug device 2.

The debug device supports UART_SETSPEED only.

Returns:

0 on success, -1 otherwise.

References At91BaudRateDiv(), _NUTDEVICE::dev_base, outr, UART_SETSPEED, and US_BRGR_OFF.

Here is the call graph for this function:

int At91DevDebugWrite	(	NUTFILE *	fp,
		const void *	buffer,
		int	len
	)

Send characters to debug device 0.

A newline character will be automatically prepended by a carriage return.

Returns:

Number of characters sent.

References _NUTFILE::nf_dev.

NUTFILE* At91DevDebugOpen	(	NUTDEVICE *	dev,
		const char *	name,
		int	mode,
		int	acc
	)

Open debug device.

Returns:

Pointer to a static NUTFILE structure.

References _NUTDEVICE::dev_dcb, _NUTFILE::nf_dev, _NUTFILE::nf_fcb, and _NUTFILE::nf_next.

int At91DevDebugClose

(

NUTFILE *

fp

)

Close debug device.

Returns:

Always 0.