作者aher2600 (和)
看板LinuxDev
標題[問題] USBtoSERIAL cable in EmbeddedLinux
時間Wed Feb 18 17:51:16 2009
小弟現在將USBtoRS232接到 Davinci的板子上,
但是在程式中OPEN ttyUSB0會回報錯誤
執行cat /dev/ttyUS0會得到下列訊息
cat /dev/ttyUSB0
drivers/usb/serial/usb-serial.c: serial_open
drivers/usb/serial/pl2303.c: pl2303_open - port 0
drivers/usb/serial/pl2303.c: 0xc0:0x1:0x8484:0x0 1 - 2
drivers/usb/serial/pl2303.c: 0x40:0x1:0x404:0x0 0
drivers/usb/serial/pl2303.c: 0xc0:0x1:0x8484:0x0 1 - 2
drivers/usb/serial/pl2303.c: 0xc0:0x1:0x8383:0x0 1 - 0
drivers/usb/serial/pl2303.c: 0xc0:0x1:0x8484:0x0 1 - 2
drivers/usb/serial/pl2303.c: 0x40:0x1:0x404:0x1 0
drivers/usb/serial/pl2303.c: 0xc0:0x1:0x8484:0x0 1 - 2
drivers/usb/serial/pl2303.c: 0xc0:0x1:0x8383:0x0 1 - 0
drivers/usb/serial/pl2303.c: 0x40:0x1:0x0:0x1 0
drivers/usb/serial/pl2303.c: 0x40:0x1:0x1:0x0 0
drivers/usb/serial/pl2303.c: 0x40:0x1:0x2:0x44 0
drivers/usb/serial/pl2303.c: 0x40:0x1:0x8:0x0 0
drivers/usb/serial/pl2303.c: 0x40:0x1:0x9:0x0 0
drivers/usb/serial/pl2303.c: pl2303_set_termios - port 0
drivers/usb/serial/pl2303.c: 0xa1:0x21:0:0 7 - 80 25 0 0 0 0 0
drivers/usb/serial/pl2303.c: pl2303_set_termios - data bits = 8
drivers/usb/serial/pl2303.c: pl2303_set_termios - baud = 9600
drivers/usb/serial/pl2303.c: pl2303_set_termios - stop bits = 1
drivers/usb/serial/pl2303.c: pl2303_set_termios - parity = none
drivers/usb/serial/pl2303.c: 0x21:0x20:0:0 7
drivers/usb/serial/pl2303.c: set_control_lines - value = 3, retval = 0
drivers/usb/serial/pl2303.c: 0xa1:0x21:0:0 7 - 80 25 0 0 0 0 8
drivers/usb/serial/pl2303.c: pl2303_open - submitting read urb
drivers/usb/serial/pl2303.c: pl2303_open - submitting interrupt urb
drivers/usb/serial/pl2303.c: pl2303_close - port 0
drivers/usb/serial/pl2303.c: pl2303_close - shutting down urbs
drivers/usb/serial/pl2303.c: pl2303_read_bulk_callback - port 0
drivers/usb/serial/pl2303.c: pl2303_read_bulk_callback - urb->status = -2
drivers/usb/serial/pl2303.c: pl2303_read_bulk_callback - unable to handle the error, exiting.
drivers/usb/serial/pl2303.c: set_control_lines - value = 0, retval = 0
drivers/usb/serial/usb-serial.c: serial_close - port 0
cat: /dev/ttyUSB0: Protocol error
錯誤似乎是urb->status的狀態為-ENOENT,
但是我查不出來發生的原因
有知道的版友可以指點一下迷津嗎
多謝
Linux kernel version 為 2.6.10
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1F：推 TroyLee:拿去換一條...有些品質不是很好.....我現在都用自己lay的 02/18 19:08
2F：推 TroyLee:（換一家的線） 02/18 19:32
3F：→ aher2600:我試過兩條了,在XP下都可正常使用 02/18 19:54
4F：→ TroyLee:那我就不了了, 會不會是少放什麼module 02/18 22:12
5F：→ motics:pl2303?pl2303x? 02/19 21:00
6F：→ aher2600:chip是pl2303 02/20 10:20