at指令后的奇怪反应

jordonlee

内核：2.6.15
CPU：mips
board:sigmadesign 8635
CDMA模块：中兴8630
驱动：内核自带的驱动:generic.c /usb-serial.c 另外加入了中兴product id ,vendor id以便能枚举设备
现像：能够枚举到设备。但是当我输入at指令后模块没有反应。打印内核信息如下，请高手指点：
serial_open
ztemt

ztemt_open - port 0
== zte_ev_usb_serial_init ==
zte_ev_usb_serial_init - port 0
result = 0

result = 7

result = 7

result = 0

result = 7

result = 7

serial_ioctl - port 0, cmd 0x540d
serial_ioctl - port 0, cmd 0x5407
serial_ioctl - port 0, cmd 0x540e
serial_set_termios - port 0
serial_ioctl - port 0, cmd 0x540d
serial_write - port 0, 8 byte(s)
usb_serial_generic_write - port 0,port state:0
buffer from application is :atd#777
buffer from application is :61
buffer from application is :74
buffer from application is :64
buffer from application is :23
buffer from application is :37
buffer from application is :37
buffer from application is :37
buffer from application is :d
锟紷Hte buffer is :atd#777
write buffer is :61
write buffer is :74
write buffer is :64
write buffer is :23
write buffer is :37
write buffer is :37
write buffer is :37
write buffer is :d
port state:1
port state:1
usb_serial_generic_write_bulk_callback - port 0
usb_serial_port_softint - port 0
usb_serial_generic_read_bulk_callback - port 0
serial_write_room - port 0
usb_serial_generic_write_room - port 0
usb_serial_generic_write_room - returns 64
serial_write - port 0, 1 byte(s)
usb_serial_generic_write - port 0,port state:0
buffer from application is :a锟斤拷锟?
buffer from application is :61
write buffer is :a
write buffer is :61
port state:1
port state:1
serial_write_room - port 0
usb_serial_generic_write_room - port 0
usb_serial_generic_write_room - returns 0
serial_write_room - port 0
usb_serial_generic_write_room - port 0
usb_serial_generic_write_room - returns 0
serial_write_room - port 0
usb_serial_generic_write_room - port 0
usb_serial_generic_write_room - returns 0
serial_write_room - port 0
usb_serial_generic_write_room - port 0
usb_serial_generic_write_room - returns 0
serial_write_room - port 0
usb_serial_generic_write_room - port 0
usb_serial_generic_write_room - returns 0
serial_write_room - port 0
usb_serial_generic_write_room - port 0
usb_serial_generic_write_room - returns 0
serial_write_room - port 0
usb_serial_generic_write_room - port 0
usb_serial_generic_write_room - returns 0
usb_serial_port_softint - port 0
serial_chars_in_buffer = port 0
usb_serial_generic_chars_in_buffer - port 0
usb_serial_generic_chars_in_buffer - returns 1
serial_write_room - port 0
usb_serial_generic_write_room - port 0
usb_serial_generic_write_room - returns 0
serial_chars_in_buffer = port 0
usb_serial_generic_chars_in_buffer - port 0
usb_serial_generic_chars_in_buffer - returns 1
serial_write_room - port 0
usb_serial_generic_write_room - port 0
usb_serial_generic_write_room - returns 0

jordonlee

请见上面下划线处：为什么在已经调用write发出at指令后会再调用write，且发送一个a

但是只要我不是输入at指令，如我输入输入t,则不会出现上述现像

jordonlee

我又在pc上试过了
不过下划线的地方不再是a,而是\r，其ascii 是d

peimichael

我在内核中强行就这个值改为d, 但是仍然没有进展


另外，我在板子上/proc/bus/usb下面发现没有内容，不知道是否有关，现上回去才能检查

jordonlee

谢谢你的回复。
1、我用的是开发板，只编了pppd在里面
2、 我生成了四个串口设备 ttyUSB0~ttyUSB3
3、at指令不是完全没有反应，有时侯有反应
4、在ubuntu8.04完全正常工作

tonyen

at后面加上\r试试

jordonlee

事实上驱动程序也在此时死在发送"a"的时候，因为驱动显示这个"a"没有发出去

dreamice

我建议你看一下他这个at指令的使用规范，软件操作没有问题的话，肯定就是你对规范的理解有误。

jordonlee

忘了说一句，同样的应用程序在pc上是可以正常运行的，所以我个人觉得at指令应该没有问题

我发的指令是"at\r"也是就说在at指令之后用了"\r"，在at指令规范中它代表指令结束符，谢谢

xiaobingjian

jordonlee:
    我也在搞8635的东西，用的是华为的EC1260，现在是可以认成ttyUSB0,但是发AT命令失败；不知道您是怎么做的；我的联系方式是QQ:513977391;MSNiaobingjian@hotmail.com;