gistfile1.txt

//gcc -o test_ez_read test_ez_read.c -lusb
 
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <stdarg.h>
#include <usb.h>
 
//Define
#define USB_VENDOR 0x1f00
#define USB_PRODUCT 0x2012
#define TIMEOUT (5*1000)
#define EP2IN	0x82
#define EP2OUT	0x02
#define IF_CDCACM       0
#define IF_CDCDATA      1
#define ACM_CTRL_DTR    0x01
#define ACM_CTRL_RTS    0x02

/* - set line encoding: here 9600 8N1
 * 9600 = 0x2580 ~> 0x80, 0x25 in little endian
 */
unsigned char encoding[] = { 0x80, 0x25, 0x00, 0x00, 0x00, 0x00, 0x08 };

/* Init USB */
struct usb_bus *USB_init()
{
	usb_init();
	usb_find_busses();
	usb_find_devices();
	return(usb_get_busses());
}
 
/* Find USB device  */
struct usb_device *USB_find(struct usb_bus *busses, struct usb_device *dev)
{
	struct usb_bus *bus;
	for(bus=busses; bus; bus=bus->next){
		for(dev=bus->devices; dev; dev=dev->next) {
			if( (dev->descriptor.idVendor==USB_VENDOR) && (dev->descriptor.idProduct==USB_PRODUCT) ){
				return( dev );
			}
		}
	}
	return( NULL );
}
/* USB Open */
struct usb_dev_handle *USB_open(struct usb_device *dev)
{
	struct usb_dev_handle *udev = NULL;
    int i, bNumIf;
 
	udev=usb_open(dev);
	if( (udev=usb_open(dev))==NULL ){
		fprintf(stderr,"usb_open Error.(%s)\n",usb_strerror());
		exit(1);
	}
 /*
	if( usb_set_configuration(udev,dev->config->bConfigurationValue)<0 ){
		if( usb_detach_kernel_driver_np(udev,dev->config->interface->altsetting->bInterfaceNumber)<0 ){
			fprintf(stderr,"usb_set_configuration Error.\n");
			fprintf(stderr,"usb_detach_kernel_driver_np Error.(%s)\n",usb_strerror());
 		}
	}
 */
    bNumIf = dev->config->bNumInterfaces;
    for(i=0; i<bNumIf; i++){
   		if( usb_claim_interface(udev, i)<0 ){
			if( usb_detach_kernel_driver_np(udev, i)<0 ){
				fprintf(stderr,"usb_claim_interface Error.\n");
				fprintf(stderr,"usb_detach_kernel_driver_np Error.(%s)\n",usb_strerror());
			}
		}
 
		if( usb_claim_interface(udev, i)<0 ){
			fprintf(stderr,"usb_claim_interface Error.(%s)\n",usb_strerror());
		}
 	}
	return(udev);
}
 
/* USB Close */
void USB_close(struct usb_dev_handle *dh)
{
	if(usb_release_interface(dh, 0)){
		fprintf(stderr,"usb_release_interface() failed. (%s)\n",usb_strerror());
		usb_close(dh);
	}
	if( usb_close(dh)<0 ){
		fprintf(stderr,"usb_close Error.(%s)\n",usb_strerror());
	}
}
 
/* USB altinterface */
void USB_altinterface(struct usb_dev_handle *dh,int tyep)
{
	if(usb_set_altinterface(dh,tyep)<0)
	{
		fprintf(stderr,"Failed to set altinterface %d: %s\n", 1,usb_strerror());
		USB_close(dh);
	}
}
 
main()
{
	struct usb_bus *bus;
	struct usb_device *dev;
	usb_dev_handle *dh;
	unsigned char buf[512];
	int ret;
	/* Initialize */
 
	printf("starting!\n");
	bus=USB_init();
	dev=USB_find(bus,dev);
	if( dev==NULL ){ 
 
 
 
 
               printf("device not found\n");
 
 
 
 
		exit(1); }
	printf("Initialize OK\n");
	/*-------------*/
	/* Device Open */
	/*-------------*/
	dh=USB_open(dev);
	if( dh==NULL ){ exit(2); }
	printf("Device Open OK\n");
 
	/*
		Put command here
	*/
    ret = usb_control_msg(dh, 0x21, 0x22, ACM_CTRL_DTR | ACM_CTRL_RTS, IF_CDCACM, NULL, 0, 0);
    ret = usb_control_msg(dh, 0x21, 0x20, 0, IF_CDCACM, encoding, sizeof(encoding), 0);
	printf("Start Read data from EP2\n");
//	USB_altinterface(dh,1);
	ret = usb_bulk_read(dh,EP2IN, buf, sizeof(buf), TIMEOUT);
	if(ret<0){
		fprintf(stderr,"usb_bulk_read() failed? buf(%d) usb(%d)\n",sizeof(buf), ret);
		fprintf(stderr,"usb_bulk_read error.(%s)\n",usb_strerror());
		USB_close(dh);
		return 1;
	}
	printf("usb_bulk_read() finished\n");
	//fwrite(buf, 1, sizeof(buf), stdout);
	fwrite(buf, 1, ret, stdout);
 
	USB_close(dh);
	printf("\nUSB End\n");
	return 0;

}

pi@raspberrypi:/src/usbtest$ cat /etc/debian_version
7.0
pi@raspberrypi:/src/usbtest$ uname -a
Linux raspberrypi 3.6.11+ #371 PREEMPT Thu Feb 7 16:31:35 GMT 2013 armv6l GNU/Linux
pi@raspberrypi:/src/usbtest$ dpkg -l | grep libusb
ii libusb-0.1-4:armhf 2:0.1.12-20+nmu1 armhf userspace USB programming library
ii libusb-1.0-0:armhf 2:1.0.11-1 armhf userspace USB programming library
ii libusb-dev 2:0.1.12-20+nmu1 armhf userspace USB programming library development files
ii libusbmuxd1 1.0.7-2 armhf USB multiplexor daemon for iPhone and iPod Touch devices - library
pi@raspberrypi:/src/usbtest$ gcc -o usbtest usbtest.c -lusb
pi@raspberrypi:~/src/usbtest$ sudo ./usbtest
starting!
Initialize OK
Device Open OK
Start Read data from EP2
usb_bulk_read() finished
a
USB End