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Date: Mon, 22 Dec 2008 13:18:58 +0800 From: arrow.ebd@...il.com To: Matan Ziv-Av <matan@...alib.org> Cc: arrow.ebd@...il.com, linux_kernel <linux-kernel@...r.kernel.org>, frank@...gswood-consulting.co.uk Subject: Re: usb-serial: how to let ch341 work with baudrate 57600 ? On Sun, Dec 21, 2008 at 04:19:01PM +0200, Matan Ziv-Av wrote: > On Sun, 21 Dec 2008, arrow.ebd@...il.com wrote: >> dear frank, >> >> I have a USB-to-RS232 connector with chip ch341, but it >> can not work under baud rate 57600. >> >> I checked baud rate is set in function "ch341_set_baudrate". >> >> How can I setup it with baudrate 57600 ? >> >> I would like hear from you, Or give me some suggestion >> to hack it. > > See here: http://lkml.org/lkml/2008/9/21/17 for a patch that allows > arbitrary baud rate. > -- > Matan Ziv-Av. matan@...alib.org Thanks for your information, I have tried it, but can not work, dmesg as below:(what should me to do) [ 2416.718758] drivers/usb/serial/ch341.c: ch341_open() [ 2416.718766] drivers/usb/serial/ch341.c: ch341_configure() [ 2416.718774] drivers/usb/serial/ch341.c: ch341_control_in(c0,5f,0000,0000,f60f9838,8) [ 2416.720055] drivers/usb/serial/ch341.c: ch341_control_out(40,a1,0000,0000) [ 2416.721035] drivers/usb/serial/ch341.c: ch341_set_baudrate(2400) [ 2416.721042] drivers/usb/serial/ch341.c: ch341_control_out(40,9a,1312,d901) [ 2416.722028] drivers/usb/serial/ch341.c: ch341_control_out(40,9a,0f2c,0006) [ 2416.723068] drivers/usb/serial/ch341.c: ch341_control_in(c0,95,2518,0000,f60f9838,8) [ 2416.724035] drivers/usb/serial/ch341.c: ch341_control_out(40,9a,2518,0050) [ 2416.725062] drivers/usb/serial/ch341.c: ch341_get_status() [ 2416.725069] drivers/usb/serial/ch341.c: ch341_control_in(c0,95,0706,0000,f60f9840,8) [ 2416.726030] drivers/usb/serial/ch341.c: ch341_control_out(40,a1,501f,d90a) [ 2416.727114] drivers/usb/serial/ch341.c: ch341_set_baudrate(2400) [ 2416.727121] drivers/usb/serial/ch341.c: ch341_control_out(40,9a,1312,d901) [ 2416.727988] drivers/usb/serial/ch341.c: ch341_control_out(40,9a,0f2c,0006) [ 2416.729062] drivers/usb/serial/ch341.c: ch341_set_handshake(0x60) [ 2416.729068] drivers/usb/serial/ch341.c: ch341_control_out(40,a4,ff9f,0000) [ 2416.730287] drivers/usb/serial/ch341.c: ch341_get_status() [ 2416.730296] drivers/usb/serial/ch341.c: ch341_control_in(c0,95,0706,0000,f60f9840,8) [ 2416.731064] drivers/usb/serial/ch341.c: ch341_set_handshake(0x60) [ 2416.731070] drivers/usb/serial/ch341.c: ch341_control_out(40,a4,ff9f,0000) [ 2416.732064] drivers/usb/serial/ch341.c: ch341_set_baudrate(2400) [ 2416.732071] drivers/usb/serial/ch341.c: ch341_control_out(40,9a,1312,d901) [ 2416.733063] drivers/usb/serial/ch341.c: ch341_control_out(40,9a,0f2c,0006) [ 2416.734064] drivers/usb/serial/ch341.c: ch341_open - submitting interrupt urb [ 2416.734071] ch341-uart ttyUSB0: ch341_open - failed submitting interrupt urb, error -2 [ 2416.734079] drivers/usb/serial/ch341.c: ch341_close - port 0 [ 2416.734084] drivers/usb/serial/ch341.c: ch341_close - shutting down urbs [ 2416.734091] drivers/usb/serial/ch341.c: ch341_set_handshake(0x00) [ 2416.734097] drivers/usb/serial/ch341.c: ch341_control_out(40,a4,ffff,0000) I have checked the "erro -2" was occured at "usb_submit_urb" "return -ENOENT". -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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