[問題] USBtoSERIAL cable in EmbeddedLinux

看板LinuxDev作者aher2600 (和)時間16年前 (2009/02/18 17:51)推噓2(2推 0噓 4→)

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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 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 61.222.84.162