uart_driver.h

ARM9系列,s3c2410实验代码

/*
 *	uart_driver.h - header file of uart driver
 *	
 *	Author: 	li ming <[e-mail]>
 *	Date:		2005-6-11
 *	Copyleft:	http://www.lumit.org
 */

#ifndef SYSCFG
#define SYSCFG      0x03FF0000
#endif

#ifndef IOPMOD
#define IOPMOD          (*((volatile unsigned *)(SYSCFG+0x5000)))
#endif

#ifndef IOPDATA
#define IOPDATA         (*((volatile unsigned *)(SYSCFG+0x5008)))
#endif

#define UART0_BASE	(SYSCFG + 0xD000)
#define UART1_BASE 	(SYSCFG + 0xE000)

/*
 * Serial settings.......................
 */
	
#define	ULCON	0x00
#define	UCON	0x04
#define	USTAT	0x08
#define	UTXBUF	0x0C
#define	URXBUF	0x10
#define	UBRDIV	0x14

/*
 * Line control register bits............
 */
 
#define	ULCR8bits	(3)
#define	ULCRS1StopBit	(0)
#define	ULCRNoParity	(0)

/*
 * UART Control Register bits............
 */
 
#define 	UCRRxM	(1)
#define 	UCRRxSI	(1 << 2)
#define 	UCRTxM	(1 << 3)
#define 	UCRLPB	(1 << 7)

/*
 * UART Status Register bits
 */
 
#define USROverrun     	(1 << 0)
#define	USRParity      	(1 << 1)
#define	USRFraming     	(1 << 2)
#define	USRBreak       	(1 << 3)
#define	USRDTR		(1 << 4)
#define	USRRxData      	(1 << 5) 
#define	USRTxHoldEmpty 	(1 << 6)
#define	USRTxEmpty     	(1 << 7)

 /* default baud rate value */
 
#define BAUD_9600	(162 << 4)

/* add 19200 for test uue */
#define BAUD_19200	(80 << 4)

#define BAUD_38400	(40 << 4)
#define BAUD_57600	(26 << 4)

/* add 115200 for download faster */
#define BAUD_115200	(13 << 4)

#define COM1_DEBUG	(1)
#define COM0_USER	(0)

// UART registers are on word aligned, D8

/* UART primitives */
#define GET_STATUS(p)	(*(volatile unsigned  *)((p) + USTAT))
#define RX_DATA(s)     	((s) & USRRxData)
#define GET_CHAR(p)	(*(volatile unsigned  *)((p) + URXBUF))
#define TX_READY(s)    	((s) & USRTxHoldEmpty)
#define PUT_CHAR(p,c)  	(*(unsigned  *)((p) + UTXBUF) = (unsigned )(c))



#define UART_SELECT_CHANNEL	1
#define UART_SET_BAUDRATE	2

int uart_open( int uart_base );

int uart_read( unsigned char * buf, int count );

int uart_write( unsigned char * buf, int count );

int uart_ioctl( unsigned int cmd, unsigned long arg );

int uart_release( void );