XgUARTClock
[UART I/O Control Functions]

Collaboration diagram for XgUARTClock:

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Detailed Description

UART device clock modes.

Any of these values may be used by the _ioctl() commands UART_SETCLOCKMODE and UART_GETCLOCKMODE. Most drivers require to set the bit rate after modifying the clock mode. In order to avoid unknown clock output frequencies in master mode, set the clock mode to UART_SYNCSLAVE first, than use UART_SETSPEED to select the bit rate and finally switch to UART_SYNCMASTER or UART_NSYNCMASTER.

Defines
#define	UART_SYNC   0x01
#define	UART_MASTER   0x02
#define	UART_NCLOCK   0x04
#define	UART_HIGHSPEED   0x20
#define	UART_ASYNC   0x00
	Normal asynchronous mode.
#define	UART_SYNCSLAVE   UART_SYNC
	Synchronous slave mode.
#define	UART_SYNCMASTER   (UART_SYNC | UART_MASTER)
	Synchronous master mode.
#define	UART_NSYNCSLAVE   (UART_SYNC | UART_NCLOCK)
	Synchronous slave mode, clock negated.
#define	UART_NSYNCMASTER   (UART_SYNC | UART_NCLOCK | UART_MASTER)
	Synchronous master mode, clock negated.
#define	UART_ASYNC_HS   UART_HIGHSPEED
	Asynchronous high speed mode.

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Define Documentation

#define UART_SYNCSLAVE   UART_SYNC

Synchronous slave mode. Transmit data changes on rising edge and receive data is sampled on the falling edge of the clock input.

#define UART_SYNCMASTER   (UART_SYNC | UART_MASTER)

Synchronous master mode. Transmit data changes on rising edge and receive data is sampled on the falling edge of the clock output.

#define UART_NSYNCSLAVE   (UART_SYNC | UART_NCLOCK)

Synchronous slave mode, clock negated. Similar to UART_SYNCSLAVE, but transmit data changes on falling edge and receive data is sampled on the rising edge of the clock input.

#define UART_NSYNCMASTER   (UART_SYNC | UART_NCLOCK | UART_MASTER)

Synchronous master mode, clock negated. Similar to UART_SYNCMASTER, but transmit data changes on falling edge and receive data is sampled on the rising edge of the clock output.

#define UART_ASYNC_HS   UART_HIGHSPEED

Asynchronous high speed mode. More deviation sensitive than normal mode, but supports higher speed.

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