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/**
* Project: AVR ATtiny USB Tutorial at http://codeandlife.com/
* Author: Joonas Pihlajamaa, joonas.pihlajamaa@iki.fi
* Based on V-USB example code by Christian Starkjohann
* Copyright: (C) 2012 by Joonas Pihlajamaa
* License: GNU GPL v3 (see License.txt)
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// this is libusb, see http://libusb.sourceforge.net/
#include <usb.h>
// same as in main.c
#define USB_LED_OFF 0
#define USB_LED_ON 1
#define USB_DATA_OUT 2
#define USB_DATA_WRITE 3
#define USB_DATA_IN 4
// used to get descriptor strings for device identification
static int usbGetDescriptorString(usb_dev_handle *dev, int index, int langid,
char *buf, int buflen) {
char buffer[256];
int rval, i;
// make standard request GET_DESCRIPTOR, type string and given index
// (e.g. dev->iProduct)
rval = usb_control_msg(dev,
USB_TYPE_STANDARD | USB_RECIP_DEVICE | USB_ENDPOINT_IN,
USB_REQ_GET_DESCRIPTOR, (USB_DT_STRING << 8) + index, langid,
buffer, sizeof(buffer), 1000);
if(rval < 0) // error
return rval;
// rval should be bytes read, but buffer[0] contains the actual response size
if((unsigned char)buffer[0] < rval)
rval = (unsigned char)buffer[0]; // string is shorter than bytes read
if(buffer[1] != USB_DT_STRING) // second byte is the data type
return 0; // invalid return type
// we're dealing with UTF-16LE here so actual chars is half of rval,
// and index 0 doesn't count
rval /= 2;
// lossy conversion to ISO Latin1
for(i = 1; i < rval && i < buflen; i++) {
if(buffer[2 * i + 1] == 0)
buf[i-1] = buffer[2 * i];
else
buf[i-1] = '?'; // outside of ISO Latin1 range
}
buf[i-1] = 0;
return i-1;
}
static usb_dev_handle * usbOpenDevice(int vendor, char *vendorName,
int product, char *productName) {
struct usb_bus *bus;
struct usb_device *dev;
char devVendor[256], devProduct[256];
usb_dev_handle * handle = NULL;
usb_init();
usb_find_busses();
usb_find_devices();
for(bus=usb_get_busses(); bus; bus=bus->next) {
for(dev=bus->devices; dev; dev=dev->next) {
if(dev->descriptor.idVendor != vendor ||
dev->descriptor.idProduct != product)
continue;
// we need to open the device in order to query strings
if(!(handle = usb_open(dev))) {
fprintf(stderr, "Warning: cannot open USB device: %s\n",
usb_strerror());
continue;
}
// get vendor name
if(usbGetDescriptorString(handle, dev->descriptor.iManufacturer, 0x0409, devVendor, sizeof(devVendor)) < 0) {
fprintf(stderr,
"Warning: cannot query manufacturer for device: %s\n",
usb_strerror());
usb_close(handle);
continue;
}
// get product name
if(usbGetDescriptorString(handle, dev->descriptor.iProduct,
0x0409, devProduct, sizeof(devVendor)) < 0) {
fprintf(stderr,
"Warning: cannot query product for device: %s\n",
usb_strerror());
usb_close(handle);
continue;
}
if(strcmp(devVendor, vendorName) == 0 &&
strcmp(devProduct, productName) == 0)
return handle;
else
usb_close(handle);
}
}
return NULL;
}
int main(int argc, char **argv) {
usb_dev_handle *handle = NULL;
int nBytes = 0;
char buffer[256];
if(argc < 2) {
printf("Usage:\n");
printf("usbtext.exe on\n");
printf("usbtext.exe off\n");
printf("usbtext.exe out\n");
printf("usbtext.exe write\n");
printf("usbtext.exe in <string>\n");
exit(1);
}
handle = usbOpenDevice(0x16C0, "y3xz.com", 0x05DC, "keyboard");
if(handle == NULL) {
fprintf(stderr, "Could not find USB device!\n");
exit(1);
}
if(strcmp(argv[1], "on") == 0) {
nBytes = usb_control_msg(handle,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN,
USB_LED_ON, 0, 0, (char *)buffer, sizeof(buffer), 5000);
} else if(strcmp(argv[1], "off") == 0) {
nBytes = usb_control_msg(handle,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN,
USB_LED_OFF, 0, 0, (char *)buffer, sizeof(buffer), 5000);
} else if(strcmp(argv[1], "out") == 0) {
nBytes = usb_control_msg(handle,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN,
USB_DATA_OUT, 0, 0, (char *)buffer, sizeof(buffer), 5000);
printf("Got %d bytes: %s\n", nBytes, buffer);
} else if(strcmp(argv[1], "write") == 0) {
nBytes = usb_control_msg(handle,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN,
USB_DATA_WRITE, 'T' + ('E' << 8), 'S' + ('T' << 8),
(char *)buffer, sizeof(buffer), 5000);
} else if(strcmp(argv[1], "in") == 0 && argc > 2) {
nBytes = usb_control_msg(handle,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_OUT,
USB_DATA_IN, 0, 0, argv[2], strlen(argv[2])+1, 5000);
}
if(nBytes < 0)
fprintf(stderr, "USB error: %s\n", usb_strerror());
usb_close(handle);
return 0;
}
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