ARM2440 识别LTE数据卡有关问题

ARM2440 识别LTE数据卡问题
Linux已经识别出数据卡对应的端口为 ttyUSB0和ttyUSB1 ，但是发送AT命令无法接收到终端响应（Windows下是正常的）.

另外，通过 cat /dev/ttyUSB0 也无法显示发送和接收的数据. 但是我通过write函数写的数据返回是成功的。

yaffs: Attempting MTD mount on 31.3, "mtdblock3"                                
yaffs: auto selecting yaffs2                                                    
yaffs: restored from checkpoint                                                 
yaffs_read_super: isCheckpointed 1                                              
VFS: Mounted root (yaffs filesystem) on device 31:3.                            
Freeing init memory: 168K                                                       
usb 1-1: New USB device found, idVendor=12d1, idProduct=14fe                    
usb 1-1: New USB device strings: Mfr=2, Product=1, SerialNumber=0               
usb 1-1: Product: HUAWEI Mobile                                                 
usb 1-1: Manufacturer: HUAWEI                                                   
usb 1-1: configuration #1 chosen from 1 choice                                  
option 1-1:1.0: GSM modem (1-port) converter detected                           
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0                   
option 1-1:1.1: GSM modem (1-port) converter detected                           

usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1                   
eth0: link up, 100Mbps, full-duplex, lpa 0xCDE1                                 

请问下，这个是我的write实际并没有写入到终端么？

[解决办法]

引用:

Linux已经识别出数据卡对应的端口为 ttyUSB0和ttyUSB1 ，但是发送AT命令无法接收到终端响应（Windows下是正常的）.

另外，通过 cat /dev/ttyUSB0 也无法显示发送和接收的数据. 但是我通过write函数写的数据返回是成功的。

yaffs: Attempting MTD mount on 31.3, "mtdblock3"              ……

这个信息显示是正常的 在贴一些出来
[解决办法]

我用cat /dev/ttyUSB0 跟踪交互一点输出都没；如果用其他终端看，可以看到AT命令交互的。

另外 调用write 返回为成功的。

有其他调试输出手段或者工具么？ 

 try to open com /dev/ttyUSB0                                                   
set done!                                                                       
com return fd=3                                                                 
cmd_len = 8                                                                     
open com successfully, now you can input AT command!                            
AT CMD: AT+                                                                     
write 4 bytes to com!                                                           

read 0 bytes from com: (这里如果先用cat 跟踪，则不会返回）
 
[解决办法]

引用:

Linux version 2.6.32.2-FriendlyARM (root@localhost.localdomain) (gcc version 4.3
.2 (Sourcery G++ Lite 2008q3-72) ) #20 Fri May 11 16:31:10 CST 2012             
CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177                        
CPU: VIVT data cache, VIVT instruction cache                                    
Machine: FriendlyARM Mini2440 development board                                 
Converting old-style param struct to taglist                                    
ATAG_INITRD is deprecated; please update your bootloader.                       
Memory policy: ECC disabled, Data cache writeback                               
On node 0 totalpages: 16384                                                     
free_area_init_node: node 0, pgdat c04e727c, node_mem_map c0524000              
  Normal zone: 128 pages used for memmap                                        
  Normal zone: 0 pages reserved                                                 
  Normal zone: 16256 pages, LIFO batch:3                                        
CPU S3C2440A (id 0x32440001)                                                    

S3C24XX Clocks, (c) 2004 Simtec Electronics                                     
S3C244X: core 405.000 MHz, memory 101.250 MHz, peripheral 50.625 MHz            
CLOCK: Slow mode (1.500 MHz), fast, MPLL on, UPLL on                            
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 16256      
Kernel command line: noinitrd root=/dev/mtdblock3 init=/linuxrc console=ttySAC0 
PID hash table entries: 256 (order: -2, 1024 bytes)                             
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)                   
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)                    
Memory: 64MB = 64MB total                                                       
Memory: 59652KB available (4612K code, 441K data, 168K init, 0K highmem)        
SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1         
Hierarchical RCU implementation.                                                
NR_IRQS:85                                                                      
irq: clearing subpending status 00000002                                        
timer tcon=00000000, tcnt a4ca, tcfg 00000200,00000000, usec 00001e57           
Console: colour dummy device 80x30                                              

console [ttySAC0] enabled                                                       
Calibrating delay loop... 201.93 BogoMIPS (lpj=504832)                          
Mount-cache hash table entries: 512                                             
CPU: Testing write buffer coherency: ok                                         
NET: Registered protocol family 16                                              
S3C2440: Initialising architecture                                              
S3C2440: IRQ Support                                                            
S3C24XX DMA Driver, (c) 2003-2004,2006 Simtec Electronics                       
DMA channel 0 at c4808000, irq 33                                               
DMA channel 1 at c4808040, irq 34                                               
DMA channel 2 at c4808080, irq 35                                               
DMA channel 3 at c48080c0, irq 36                                               
S3C244X: Clock Support, DVS off                                                 

bio: create slab <bio-0> at 0                                                   
SCSI subsystem initialized                                                      
usbcore: registered new interface driver usbfs                                  
usbcore: registered new interface driver hub                                    
usbcore: registered new device driver usb                                       
s3c-i2c s3c2440-i2c: slave address 0x10                                         
s3c-i2c s3c2440-i2c: bus frequency set to 98 KHz                                
s3c-i2c s3c2440-i2c: i2c-0: S3C I2C adapter                                     
Sangoma WANPIPE Router v1.1 (c) 1995-2000 Sangoma Technologies Inc.             
cfg80211: Calling CRDA to update world regulatory domain                        
NET: Registered protocol family 2                                               
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)                  
TCP established hash table entries: 2048 (order: 2, 16384 bytes)                
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)       
[解决办法]
dmesg 其他信息有点错。。被公司防火墙栏了。发不出来..@@

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