Regarding rasberry pi usb library

[sanket123]

hello,

I am new to rasberry pi 3. I have install rasbian OS on my board.
I need to use usb library for communication of rasberry pi usb port with GSM usb port.
how should i start?

[topguy]

Are you sure you need an "USB library" ?
GSM devices if they are recognized by the kernel will become devices which you can talk to usually without any special libraries.

Connect your device after the Pi has booted and then run the command "dmesg" in a terminal and look at the last messages because they are most likely related to your device. A typical response from inserting a GSM/3G dongle is to get one or more /dev/ttyUSB0 devices. These are (virtual) serial ports you can read and write to.

[sanket123]

Are you sure you need an "USB library" ?
GSM devices if they are recognized by the kernel will become devices which you can talk to usually without any special libraries.

Connect your device after the Pi has booted and then run the command "dmesg" in a terminal and look at the last messages because they are most likely related to your device. A typical response from inserting a GSM/3G dongle is to get one or more /dev/ttyUSB0 devices. These are (virtual) serial ports you can read and write to.

Yes, my GSM module gets detected on raspberry pi usb port.I need send some commands to gsm device through c code. So to write application code for usb of raspberry pi I need to use usb library libraries in c. So how to install usb libraries in raspberry pi and is there any ide to generate execution fro raspberry pi so that i can run my application on boot without using raspbian OS.

[rpdom]

Often the USB device will show up as a serial port and you can access that without needing to touch any USB code.

However, if you want to write code to use USB you will probably need to install libusb-dev and libusb-1.0-0-dev for C and additionally libusb++-dev if you are going to use C++.

[sanket123]

Often the USB device will show up as a serial port and you can access that without needing to touch any USB code.

However, if you want to write code to use USB you will probably need to install libusb-dev and libusb-1.0-0-dev for C and additionally libusb++-dev if you are going to use C++.

I have installed usb library using following commands:

sudo apt-get install libusb-1.0-0
sudo apt-get install libusb-1.0-0-dev

I have written simple code

#include <stdio.h>
#include <libusb-1.0/libusb.h>

int main(int argc, char **argv)
{

libusb_init(NULL);

printf("hello");
return 0;
}

I have compile as gcc usb1.c -o usb1

But getting error

/tmp/ccC7cEyG.o: In function `main':
usb1.c:(.text+0x18): undefined reference to `libusb_init'
collect2: error: ld returned 1 exit status

I have also tried as
gcc usb1.c -o usb1 -l/usr/include/libusb-1.0

getting same error as:

/usr/bin/ld: cannot find -l/usr/include/libusb-1.0
collect2: error: ld returned 1 exit status

please help....

[piras77]

Code: Select all

$ find /usr | grep libusb | grep \.so\$
/usr/lib/arm-linux-gnueabihf/libusb-1.0.so

There is your lib.

So all you need:

Code: Select all

$ gcc usb1.c -o usb1 -lusb-1.0
$ ./usb1
hello

[sanket123]

Code: Select all

$ find /usr | grep libusb | grep \.so\$
/usr/lib/arm-linux-gnueabihf/libusb-1.0.so

There is your lib.

So all you need:

Code: Select all

$ gcc usb1.c -o usb1 -lusb-1.0
$ ./usb1
hello

Thank you
It worked with above commands

[rpdom]

Yes, the command I used to build USB software was cc -g -o outputfile sourcefile.c -lusb-1.0

[sanket123]

Yes, the command I used to build USB software was cc -g -o outputfile sourcefile.c -lusb-1.0

I am going to communicate with usb device from raspberry pi 3 using c program.

Do you know any function through which i can write and read some data from usb?

Any link which can help me

[scotty101]

Can you share a link to the GSM device you are communicating with?

It is not possible to tell you what commands to send to the device unless we know precisely which module you are using.

Also it would be helpful if you would copy the output of the command "lsusb" here so we can see what type of device the raspberry pi recognises the GSM module as.
As other posters have tried to get across to you, most GSM modules can be communicated to to as if they were a serial port rather than having to deal with USB.

[sanket123]

Can you share a link to the GSM device you are communicating with?

It is not possible to tell you what commands to send to the device unless we know precisely which module you are using.

Also it would be helpful if you would copy the output of the command "lsusb" here so we can see what type of device the raspberry pi recognises the GSM module as.
As other posters have tried to get across to you, most GSM modules can be communicated to to as if they were a serial port rather than having to deal with USB.

GSM module is detected as

001 Device 008: ID 1e0e:9001 Qualcomm / Option

Gsm module is SIM7600.
It has usb port. I need to fire simple AT command and read response in C.

[scotty101]

Right so you do not need libusb. At all.

You need to send commands via the serial port that is created when the GSM module is plugged in. This might be called /dev/ttyUSB0 or something similar.

Since you are using C, I'd suggest you give Wiring Pi a try and use its serial port functions
http://wiringpi.com/reference/serial-library/

I can't find the datasheet for the SIM7600 so you'll need to find the AT commands and use the wiring pi serial library to send the AT commands.

[sanket123]

Right so you do not need libusb. At all.

You need to send commands via the serial port that is created when the GSM module is plugged in. This might be called /dev/ttyUSB0 or something similar.

Since you are using C, I'd suggest you give Wiring Pi a try and use its serial port functions
http://wiringpi.com/reference/serial-library/

I can't find the datasheet for the SIM7600 so you'll need to find the AT commands and use the wiring pi serial library to send the AT commands.

I am able send command and read response now.
I have use following functions which work
open(portname, O_RDWR | O_NOCTTY | O_SYNC);
write(fd,cmd,strlen(cmd));
read(fd, buf, sizeof(buf) - 1);

Is it possible to run application on boot.?
Without using raspbian OS or with raspbian os.

how can I generate .hex or exe for my application as we do for microcontrollers like (PIC,etc)?
so that I can burn that file in sd card to run my application.

[jamesh]

You are using a set of libraries that require the full Linux OS to be running.

If you want this to run 'bare metal' you have a completely different set of problems and things will get a lot more complicated.

Remember, the Pi is NOT a micro controller - it is a full blown Linux PC.

Search for "Linux Running program on startup" to get details on this.

[W. H. Heydt]

Is it possible to run application on boot.?
Without using raspbian OS or with raspbian os.

There are a bunch of ways to run a program (or shell script) at boot. The choice will probably depend on what else you need running and how you define "at boot". Two of them are... using crontab with the "@reboot" for timing. If you need a GUI desktop up, add the command the default account "autostart" file. Obviously in this case, you can't (successfully) run your program until after the USB devices have been enumerated.