www.pudn.com > serial_se3208_2.rar > serial_se3208_2.c

#include  
#include  
#include  
#include  
#include  
#include  
#include  
#include  
#include  
#include  
 
#include  
 
#include  
#include  
#include  
 
#define UART0_NAME "uart0" 
#define UART0_MAJOR 206 
#define UATR0_MINOR 
 
#define USTAT_OVERRUN_ERROR_BIT 	0x00000001 
#define USTAT_PARITY_ERR0R_BIT 	0x00000002 
#define USTAT_FRAME_ERR0R_BIT 		0x00000004 
#define USTAT_BREAK_DETECT_BIT 	0x00000008 
#define USTAT_RX_EMPTY_BIT			0x00000010 
#define USTAT_TX_HOLD_BIT			0x00000020 
#define USTAT_TX_EMPTY_BIT			0x00000040 
#define USTAT_RX_FIFO_BIT			0x00000F00 
#define USTAT_TX_FIFO_BIT			0x0000F000 
 
 
static DECLARE_WAIT_QUEUE_HEAD(rx_queue); 
static DECLARE_WAIT_QUEUE_HEAD(tx_queue); 
 
static devfs_handle_t devfs_handle, devfs_uart0_dir; 
static char *dev_iduart0 = UART0_NAME; 
 
#define BUFSIZE 128 
#define FIFOSIZE 16 
#define TIMEOUT 10 
unsigned char uart0_rx_buf[BUFSIZE]; 
static char uart0_tx_buf[BUFSIZE]; 
size_t rx_buf_count, rx_user_count; 
size_t tx_buf_count, tx_user_count; 
 
static ssize_t uart0_read(struct file *filp, char *buf, size_t count, loff_t *l) 
{ 
	char *user_buf=buf; 
 
	rx_buf_count=0; 
	rx_user_count=count; 
	 
	while(rx_user_count>0){ 
		if (*USTAT0 & USTAT_RX_EMPTY_BIT){ 
			uart0_rx_buf[rx_buf_count]=*URXB0; 
			rx_buf_count++; 
		}else{ 
			interruptible_sleep_on_timeout(&rx_queue, TIMEOUT); 
		} 
	 
		if (rx_user_count>BUFSIZE && rx_buf_count==BUFSIZE){ 
			copy_to_user(user_buf, &uart0_rx_buf, BUFSIZE); 
			user_buf+=BUFSIZE; 
			rx_buf_count=0; 
			rx_user_count-=BUFSIZE; 
		}else if (rx_user_count==rx_buf_count){ 
			copy_to_user(user_buf, &uart0_rx_buf, rx_user_count); 
			rx_user_count=0; 
			rx_buf_count=0; 
		} 
	} 
	return count; 
} 
 
static ssize_t uart0_write(struct file *filp, const char *buf, size_t count, loff_t *l) 
{ 
	char *user_buf=buf; 
	int i,j=0; 
 
	tx_buf_count=0; 
	tx_user_count=count; 
 
 
	while(tx_user_count>0){ 
		if (tx_user_count>BUFSIZE){ 
			copy_from_user(&uart0_tx_buf, user_buf, BUFSIZE); 
			user_buf+=BUFSIZE; 
			tx_buf_count=BUFSIZE; 
			j=0; 
			tx_user_count-=BUFSIZE; 
		}else if (tx_user_count<=BUFSIZE){ 
			copy_from_user(&uart0_tx_buf, user_buf, tx_user_count); 
			tx_buf_count=tx_user_count; 
			j=0; 
			tx_user_count=0; 
		} 
 
		while (tx_buf_count>0){ 
				if (tx_buf_count>FIFOSIZE){ 
					for(i=0;i