USB - Serial Arduino C code lsusb ?? Please help (usb_set_configuration)

PeterUK · 09-25-2012, 03:17 PM

Hi!

I am trying to read data sent to USB link using an Arduino.

I have download the firmware and it work on the IDE development environment of Arduino.

The first problem I have now is about usb_set_configuration I get error the value is returned -16

Now I connect the device and do lsusb and I get:

Code:

Bus 006 Device 024: ID 2341:0001

I do lsusb -v -d 2341:0001

and I get:

Quote:

Bus 006 Device 024: ID 2341:0001
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 2 Communications
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x2341
idProduct 0x0001
bcdDevice 0.01
iManufacturer 1 Arduino (www.arduino.cc)
iProduct 2 Arduino Uno
iSerial 220 74136333033351E07161
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 62
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 Communications
bInterfaceSubClass 2 Abstract (modem)
bInterfaceProtocol 1 AT-commands (v.25ter)
iInterface 0
CDC Header:
bcdCDC 10.01
CDC ACM:
bmCapabilities 0x06
sends break
line coding and serial state
CDC Union:
bMasterInterface 0
bSlaveInterface 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 255
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Device Status: 0x0000
(Bus Powered)

I also have added the Usbdev to rules.d as:

Quote:

SUBSYSTEM=="usb", ACTION=="add", ATTRS{idVendor}=="2341", ATTRS{idProduct}=="0001", DRIVER=="usbtest", RUN+="/bin/sh -c 'echo -n %k> %S%p/driver/unbind'"

On my C code the first problem is about:

Quote:

n_open = usb_set_configuration(usbhandle,2);

I get is fail the value returned is -16 what may I doing wrong?

PeterUK · 09-25-2012, 05:55 PM

A update here I know that 2 in the int config is wrong according to some page I went the bConfigurationValue is 1

as you can see on the lsusb.

But this still returning -16

PeterUK · 09-25-2012, 07:33 PM

Other thing if I do cat and the device I can see the serial data coming...

firstfire · 09-25-2012, 11:47 PM

Hi.

Look here for a description of how to communicate with this board without usb-serial driver (like cdc_acm). Because you have a device file in /dev, you probably have corresponding module (cdc_acm ?) loaded, which blocks your usb device (it is already used by the module). So try to remove (unload) that module:

Code:

sudo rmmod cdc_acm

You may need to discover which module is actually used: look at dmesg, lsmod etc.

On the other hand I'd advise you to just use standard driver, i.e. to communicate via /dev/ttyACM0 (or whatever name it is given).

PeterUK · 09-26-2012, 04:12 AM

Quote:

Originally Posted by firstfire

Hi.

Look here for a description of how to communicate with this board without usb-serial driver (like cdc_acm). Because you have a device file in /dev, you probably have corresponding module (cdc_acm ?) loaded, which blocks your usb device (it is already used by the module). So try to remove (unload) that module:

Code:

sudo rmmod cdc_acm

You may need to discover which module is actually used: look at dmesg, lsmod etc.

On the other hand I'd advise you to just use standard driver, i.e. to communicate via /dev/ttyACM0 (or whatever name it is given).

Thanks for this, I went to bed thinking that was the problem like something is already opening that port.

I got a reply form another forum and now I have some code for serial comm as you suggested

Nevertheless today when I do cat to the dev its not hanging on it, after reading in close the cat do you know why?

PeterUK · 09-26-2012, 04:37 AM

That is very strange I reboot the PC and cat work fine it hang after executing and every time I sent data to USB_Serial (push button) I get it on the terminal but after running the C code to read the Serial port it stop hanging it close cat command on the terminal. Do you know why?

Here is the c code I am running.

Quote:

/*
* Arduino-serial
* --------------
*
* A simple command-line example program showing how a computer can
* communicate with an Arduino board. Works on any POSIX system (Mac/Unix/PC)
*
*
* Compile with something like:
* gcc -o arduino-serial arduino-serial.c
*
* Created 5 December 2006
* Copyleft (c) 2006, Tod E. Kurt, tod@todbot.com
* http://todbot.com/blog/
*
*
* Updated 8 December 2006:
* Justin McBride discoevered B14400 & B28800 aren't in Linux's termios.h.
* I've included his patch, but commented out for now. One really needs a
* real make system when doing cross-platform C and I wanted to avoid that
* for this little program. Those baudrates aren't used much anyway.

*
* Updated 26 December 2007:
* Added ability to specify a delay (so you can wait for Arduino Diecimila)
* Added ability to send a binary byte number
*
* Update 31 August 2008:
* Added patch to clean up odd baudrates from Andy at hexapodia.org
*
*/

#include <stdio.h> /* Standard input/output definitions */
#include <stdlib.h>
#include <stdint.h> /* Standard types */
#include <string.h> /* String function definitions */
#include <unistd.h> /* UNIX standard function definitions */
#include <fcntl.h> /* File control definitions */
#include <errno.h> /* Error number definitions */
#include <termios.h> /* POSIX terminal control definitions */
#include <sys/ioctl.h>
#include <getopt.h>

void usage(void);
int serialport_init(const char* serialport, int baud);
int serialport_writebyte(int fd, uint8_t b);
int serialport_write(int fd, const char* str);
int serialport_read_until(int fd, char* buf, char until);

void usage(void) {
printf("Usage: arduino-serial -p <serialport> [OPTIONS]\n"
"\n"
"Options:\n"
" -h, --help Print this help message\n"
" -p, --port=serialport Serial port Arduino is on\n"
" -b, --baud=baudrate Baudrate (bps) of Arduino\n"
" -s, --send=data Send data to Arduino\n"
" -r, --receive Receive data from Arduino & print it out\n"
" -n --num=num Send a number as a single byte\n"
" -d --delay=millis Delay for specified milliseconds\n"
"\n"
"Note: Order is important. Set '-b' before doing '-p'. \n"
" Used to make series of actions: '-d 2000 -s hello -d 100 -r' \n"
" means 'wait 2secs, send 'hello', wait 100msec, get reply'\n"
"\n");
}

int main(int argc, char *argv[])
{
int fd = 0;
char serialport[256];
int baudrate = B9600; // default
char buf[256];
int rc,n;

if (argc==1) {
usage();
exit(EXIT_SUCCESS);
}

/* parse options */
int option_index = 0, opt;
static struct option loptions[] = {
{"help", no_argument, 0, 'h'},
{"port", required_argument, 0, 'p'},
{"baud", required_argument, 0, 'b'},
{"send", required_argument, 0, 's'},
{"receive", no_argument, 0, 'r'},
{"num", required_argument, 0, 'n'},
{"delay", required_argument, 0, 'd'}
};

while(1) {
opt = getopt_long (argc, argv, "hp:b:s:rn:d:",
loptions, &option_index);
if (opt==-1) break;
switch (opt) {
case '0': break;
case 'd':
n = strtol(optarg,NULL,10);
usleep(n * 1000 ); // sleep milliseconds
break;
case 'h':
usage();
break;
case 'b':
baudrate = strtol(optarg,NULL,10);
break;
case 'p':
strcpy(serialport,optarg);
fd = serialport_init(optarg, baudrate);
if(fd==-1) return -1;
break;
case 'n':
n = strtol(optarg, NULL, 10); // convert string to number
rc = serialport_writebyte(fd, (uint8_t)n);
if(rc==-1) return -1;
break;
case 's':
strcpy(buf,optarg);
rc = serialport_write(fd, buf);
if(rc==-1) return -1;
break;
case 'r':
serialport_read_until(fd, buf, '\n');
printf("read: %s\n",buf);
break;
}
}

exit(EXIT_SUCCESS);
} // end main

int serialport_writebyte( int fd, uint8_t b)
{
int n = write(fd,&b,1);
if( n!=1)
return -1;
return 0;
}

int serialport_write(int fd, const char* str)
{
int len = strlen(str);
int n = write(fd, str, len);
if( n!=len )
return -1;
return 0;
}

int serialport_read_until(int fd, char* buf, char until)
{
char b[1];
int i=0;
do {
int n = read(fd, b, 1); // read a char at a time
if( n==-1) return -1; // couldn't read
if( n==0 ) {
usleep( 10 * 1000 ); // wait 10 msec try again
continue;
}
buf[i] = b[0]; i++;
} while( b[0] != until );

buf[i] = 0; // null terminate the string
return 0;
}

// takes the string name of the serial port (e.g. "/dev/tty.usbserial","COM1")
// and a baud rate (bps) and connects to that port at that speed and 8N1.
// opens the port in fully raw mode so you can send binary data.
// returns valid fd, or -1 on error
int serialport_init(const char* serialport, int baud)
{
struct termios toptions;
int fd;

//fprintf(stderr,"init_serialport: opening port %s @ %d bps\n",
// serialport,baud);

fd = open(serialport, O_RDWR | O_NOCTTY | O_NDELAY);
if (fd == -1) {
perror("init_serialport: Unable to open port ");
return -1;
}

if (tcgetattr(fd, &toptions) < 0) {
perror("init_serialport: Couldn't get term attributes");
return -1;
}
speed_t brate = baud; // let you override switch below if needed
switch(baud) {
case 4800: brate=B4800; break;
case 9600: brate=B9600; break;
#ifdef B14400
case 14400: brate=B14400; break;
#endif
case 19200: brate=B19200; break;
#ifdef B28800
case 28800: brate=B28800; break;
#endif
case 38400: brate=B38400; break;
case 57600: brate=B57600; break;
case 115200: brate=B115200; break;
}
cfsetispeed(&toptions, brate);
cfsetospeed(&toptions, brate);

// 8N1
toptions.c_cflag &= ~PARENB;
toptions.c_cflag &= ~CSTOPB;
toptions.c_cflag &= ~CSIZE;
toptions.c_cflag |= CS8;
// no flow control
toptions.c_cflag &= ~CRTSCTS;

toptions.c_cflag |= CREAD | CLOCAL; // turn on READ & ignore ctrl lines
toptions.c_iflag &= ~(IXON | IXOFF | IXANY); // turn off s/w flow ctrl

toptions.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); // make raw
toptions.c_oflag &= ~OPOST; // make raw

// see: http://unixwiz.net/techtips/termios-vmin-vtime.html
toptions.c_cc[VMIN] = 0;
toptions.c_cc[VTIME] = 20;

if( tcsetattr(fd, TCSANOW, &toptions) < 0) {
perror("init_serialport: Couldn't set term attributes");
return -1;
}

return fd;
}