skylarmt/usbscale
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Seems to be getting data now.

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This commit is contained in:
Eric Jiang 2011-02-13 20:47:37 -05:00
parent a9190a5703
commit e48f9984c7
1 changed files with 7 additions and 11 deletions
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18
usbscale.c
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@ -13,7 +13,7 @@
#define HID_REPORT_GET 0x01
#define HID_RT_INPUT 0x01
#define WEIGH_REPORT_ID 0x06 // Scale Data Report ID
#define WEIGH_REPORT_SIZE 0x07
#define WEIGH_REPORT_SIZE 0x06
static libusb_device* find_scale(libusb_device**);
@ -57,21 +57,17 @@ int main(void)
* test_libhid.c
*/
unsigned char data[WEIGH_REPORT_SIZE];
unsigned int len = libusb_control_transfer(
unsigned int len;
unsigned int res = libusb_interrupt_transfer(
handle,
//bmRequestType => direction: in, type: class,
// recipient: interface
LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_CLASS |
LIBUSB_ENDPOINT_IN | //LIBUSB_REQUEST_TYPE_CLASS |
LIBUSB_RECIPIENT_INTERFACE,
//bRequest => HID_REPORT_GET
// see HID1_11.pdf 60/97 (pg 51)
HID_REPORT_GET,
//wValue => hid report, no report ID
0x0100,
0x00, //windex => interface 0
data,
WEIGH_REPORT_SIZE, //wLength
10000 //timeout => 1 sec
WEIGH_REPORT_SIZE, // length of data
&len,
10000 //timeout => 10 sec
);
int i;
printf("Got %d bytes from control transfer:\n", len);