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Add a zero report ID to the commands

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The zero report ID byte is required when using the hidapi library. We
just never noticed this problem before, because we use libusb by
default, and libusb doesn't need the extra zero byte.
This commit is contained in:
Jef Driesen 2017-07-11 00:17:36 +02:00
parent 05c858bf96
commit d251b373be
1 changed files with 5 additions and 4 deletions
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9
src/uwatec_g2.c
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@ -110,16 +110,17 @@ uwatec_g2_transfer (uwatec_g2_device_t *device, const unsigned char command[], u
dc_status_t status = DC_STATUS_SUCCESS;
size_t transferred = 0;
if (csize >= PACKET_SIZE) {
if (csize + 2 > PACKET_SIZE) {
ERROR (device->base.context, "command too big (%d)", csize);
return DC_STATUS_INVALIDARGS;
}
HEXDUMP (device->base.context, DC_LOGLEVEL_DEBUG, "cmd", command, csize);
buf[0] = csize;
memcpy(buf + 1, command, csize);
status = dc_usbhid_write (device->usbhid, buf, csize + 1, &transferred);
buf[0] = 0;
buf[1] = csize;
memcpy(buf + 2, command, csize);
status = dc_usbhid_write (device->usbhid, buf, csize + 2, &transferred);
if (status != DC_STATUS_SUCCESS) {
ERROR (device->base.context, "Failed to send the command.");
return status;