So I sat down to start seeing if I could write the aforementioned driver for the Logitech Harmony remote using libusb. After reading the docs, I whipped out the following test code (ok, its mostly a copy and paste of the docs, but that's OK) which binds to the interface and attempts to do an interrupt transfer to the endpoint.
But I get: "error submitting URB: Bad address". I've attached the (very ugly) code below, but I don't think it's a coding error as much as a not understanding error. Looking at lsusb, the device has one Configuration with bConfigurationValue 1, and one Interface with bInterfaceNumber 0. Under this interface, it has two endpoints, 0x81, "EP 1 IN", and 0x02, "EP 1 OUT", which I believe, from looking at USB Snoopy dumps, are IN ==> device-to-host, and OUT ==> host-to-device. But I've tried my code using both endpoints, and get the same error each time. The USBSnoopy log shows from windows shows a very simple setup: SELECT_CONFIGURATION, CLASS_INTERFACE, GET_DESCRIPTOR_FROM_INTERFACE, and then a ton of BULK_OR_INTERRUPT_TRANSFERs. lsusb shows that the devices or of transfer type Interrupt. Since all the software does is write a blob to the remote (which, after looking, turns out to just be XML), this all seems straight forward. It doesn't seem like I have to do any special setup... The USBSnoopy logs show it writing 64 bytes at a time, so that's what I write in my code. -- Phil Dibowitz [EMAIL PROTECTED] Open Source software and tech docs Insanity Palace of Metallica http://www.phildev.net/ http://www.ipom.com/ "Never write it in C if you can do it in 'awk'; Never do it in 'awk' if 'sed' can handle it; Never use 'sed' when 'tr' can do the job; Never invoke 'tr' when 'cat' is sufficient; Avoid using 'cat' whenever possible" -- Taylor's Laws of Programming
#include <stdio.h>
#include <errno.h>
#include <stdio.h>
#include <usb.h>
#define LH_VENDOR_ID 0x046d
#define LH_PRODUCT_ID 0xc110
#define DATAFILE "/tmp/Connectivity.EZHex"
#define SIZE 64
#define IN_EP 0x81
#define OUT_EP 0x02
void write_data(usb_dev_handle *udev);
int main(int argc, char *argv[])
{
struct usb_bus *busses, *bus;
int retval = 0;
usb_init();
usb_find_busses();
usb_find_devices();
busses = usb_get_busses();
/* loop through busses... */
for (bus = busses; bus; bus = bus->next) {
struct usb_device *dev;
/* loop through devices on bus ...*/
for (dev = bus->devices; dev; dev = dev->next) {
usb_dev_handle *udev;
if (dev->descriptor.idVendor == LH_VENDOR_ID
&& dev->descriptor.idProduct == LH_PRODUCT_ID) {
printf("Found remote\n");
udev = usb_open(dev);
if (!udev) {
printf("Failed to open device\n");
exit(1);
}
printf("Opened device\n");
/*
* Choose the first configuration (1)
*/
if (usb_set_configuration(udev,1) < 0) {
printf("Failed to set conf: %s\n",
usb_strerror());
exit(1);
}
printf("Set conf\n");
/*
* Choose the first interface (0)
*/
retval = usb_claim_interface(udev,1);
if (retval == -EBUSY) {
printf("Interface busy\n");
exit(1);
}
printf("Claimed device\n");
write_data(udev);
usb_release_interface(udev,0);
printf("released device\n");
usb_close(udev);
printf("closed device\n");
exit(0);
} else {
printf("Found another device\n");
continue;
}
}
}
exit(1);
}
void write_data(usb_dev_handle* udev)
{
printf("writing data...\n");
char buf[SIZE];
int bytes = 0;
FILE *fh;
fh = fopen(DATAFILE, "r");
int i = 0;
while (bytes = read((int)fh, buf, SIZE)) {
printf("writing %d bytes (%d)\n",SIZE,++i);
if (usb_interrupt_write(udev, OUT_EP, buf, bytes, 2) < 0) {
printf("Write failed: %s\n", usb_strerror());
return;
}
}
fclose(fh);
}
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