Hi! I had an issue with the serial ports a while ago, that affected both the built-in ports and USB<->serial-ports. After sending a couple of hundred bytes to one of the ports, all read() / write() functions suddenly failed. I tried to compile some new images, but it didn't help. Then I booted up a fresh version of the sdk via VMware, built a new image without reusing anything from the old sdk, and recompiled my application. Then everything worked again. I'm not sure about what really happened, but it seems like something in the sdk got screwed up after experimenting with (a lot of) different kernel configurations. Perhaps you should try the same.
Regards /Tobias --- In [email protected], Antonio Galea <[EMAIL PROTECTED]> wrote: > > Hello all, > I've connected the device to a power supply, but it seems to do nothing: no > leds light up until I plug the USB cable in, and the behaviour is the same as > with no power attached. > > To check deeper for USB drivers issues, I've reflashed my Fox with a 2.4.31 > kernel (with USB serial debug turned on) and compiled the CP2101 driver as a > module; it loads without apparent problems: > > ------------------------------------------------------------------------------ > usbserial.c: USB Serial support registered for CP2101/CP2102/CP2103 > USB to UART Bridge > cp2101.c: Silicon Labs CP2101/CP2102/CP2103 RS232 serial adaptor driver v0.11 > ------------------------------------------------------------------------------ > > When I plug in the device, the output is promising: > ------------------------------------------------------------------------------ > hub.c: port 1, portstatus 1, change 1, 12 Mb/s > hub.c: port 1 connection change > hub.c: port 1, portstatus 1, change 1, 12 Mb/s > hub.c: port 1, portstatus 1, change 0, 12 Mb/s > hub.c: port 1, portstatus 1, change 0, 12 Mb/s > hub.c: port 1, portstatus 1, change 0, 12 Mb/s > hub.c: port 1, portstatus 1, change 0, 12 Mb/s > usb-host.c: USB controller running. > hub.c: port 1, portstatus 3, change 10, 12 Mb/s > hub.c: new USB device ETRAX 100LX-1, assigned address 2 > usb.c: kmalloc IF c0df6e00, numif 1 > usb.c: new device strings: Mfr=1, Product=2, SerialNumber=3 > usb.c: USB device number 2 default language ID 0x409 > Manufacturer: Silicon Labs > Product: CP2101 USB to UART Bridge Controller > SerialNumber: 0001 > usbserial.c: descriptor matches > usbserial.c: found bulk out > usbserial.c: found bulk in > usbserial.c: CP2101/CP2102/CP2103 USB to UART Bridge converter detected > usbserial.c: get_free_serial 1 > usbserial.c: get_free_serial - minor base = 0 > usbserial.c: usb_serial_probe - setting up 1 port structures for this device > usbserial.c: CP2101/CP2102/CP2103 USB to UART Bridge converter now > attached to ttyUSB0 (or usb/tts/0 for devfs) > usb.c: serial driver claimed interface c0df6e00 > hub.c: port 2, portstatus 0, change 0, 12 Mb/s > ------------------------------------------------------------------------------ > > So, I can now start my program: it opens the interface correctly, but hangs > when reading. Here's the functions I use for driving the UART: > > ------------------------------------------------------------------------------ > int tty_open(char* tty_dev) { > struct termios new_attributes; > tty_fd = open(tty_dev,O_RDWR| O_NOCTTY); > if (tty_fd<0) { return -1; } > tcgetattr(tty_fd,&tty_saved_attributes); > bzero(&new_attributes, sizeof(new_attributes)); > new_attributes.c_cflag = CREAD | B19200 | CS8 | CLOCAL; > new_attributes.c_iflag = IGNPAR; > new_attributes.c_oflag = 0; > new_attributes.c_lflag = ~(ICANON) & ~(ECHO) & ~(ECHOE) & ~(ISIG); > new_attributes.c_cc[VMIN]=1; > new_attributes.c_cc[VTIME]=0; > tcflush(tty_fd, TCIFLUSH); > tcsetattr(tty_fd, TCSANOW, &new_attributes); > return tty_fd; > } > int tty_write(char *buffer, int len){ return write(tty_fd,buffer,len); } > char tty_getc(){ char c; read(tty_fd,&c,1); return c; } > void tty_close(){ > if (tty_fd>0) tcsetattr(tty_fd,TCSANOW,&tty_saved_attributes); > close(tty_fd); > } > ------------------------------------------------------------------------------ > > The output from dmesg is the following: > ------------------------------------------------------------------------------ > usbserial.c: serial_open > cp2101.c: cp2101_open - port 0 > cp2101.c: cp2101_get_termios - port 0 > cp2101.c: cp2101_get_termios - baud rate = 115200 > cp2101.c: cp2101_get_termios - data bits = 8 > cp2101.c: cp2101_get_termios - parity = NONE > cp2101.c: cp2101_get_termios - stop bits = 1 > cp2101.c: cp2101_get_termios - flow control = NONE > cp2101.c: cp2101_tiocmset - port 0 > cp2101.c: cp2101_tiocmset - control = 0x0303 > usbserial.c: serial_ioctl - port 0, cmd 0x5401 > cp2101.c: cp2101_ioctl (0) cmd = 0x5401 > cp2101.c: cp2101_ioctl not supported = 0x5401 > usbserial.c: serial_ioctl - port 0, cmd 0x540b > cp2101.c: cp2101_ioctl (0) cmd = 0x540b > cp2101.c: cp2101_ioctl not supported = 0x540b > usbserial.c: serial_ioctl - port 0, cmd 0x5402 > cp2101.c: cp2101_ioctl (0) cmd = 0x5402 > cp2101.c: cp2101_ioctl not supported = 0x5402 > usbserial.c: serial_set_termios - port 0 > cp2101.c: cp2101_set_termios - port 0 > cp2101.c: cp2101_set_termios - Setting baud rate to 19200 baud > usbserial.c: serial_ioctl - port 0, cmd 0x5401 > cp2101.c: cp2101_ioctl (0) cmd = 0x5401 > cp2101.c: cp2101_ioctl not supported = 0x5401 > usbserial.c: __serial_write - port 0, 4 byte(s) > usbserial.c: generic_write - port 0 [4] > usbserial.c: generic_write_bulk_callback - port 0 > usbserial.c: port_softint - port 0 > ------------------------------------------------------------------------------ > > and my program just hangs on a tty_getc(). > > Is there anything obvious that I'm missing? > > Thanks in advance for your help, > > Ant9000 >
