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scpi/usbtmc: fix remote locking according to USBTMC spec 

According to USBTMC usb488 subclass spec, wValue hast to be 0 for both
LOCAL_LOCKOUT and GO_TO_LOCAL. At least required for R&S HMO1002, the
bad request results in a STALL. Fixes bug #783.
This commit is contained in:
Stefan Brüns 2016-04-16 23:37:40 +02:00 committed by Uwe Hermann
parent 3db03efa4a
commit 66836720f7
1 changed files with 2 additions and 2 deletions
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4
src/scpi/scpi_usbtmc_libusb.c
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@ -238,7 +238,7 @@ static int scpi_usbtmc_remote(struct scpi_usbtmc_libusb *uscpi)
LIBUSB_ENDPOINT_IN |
LIBUSB_REQUEST_TYPE_CLASS |
LIBUSB_RECIPIENT_INTERFACE,
LOCAL_LOCKOUT, 1,
LOCAL_LOCKOUT, 0,
uscpi->interface,
&status, 1,
TRANSFER_TIMEOUT);
@ -276,7 +276,7 @@ static void scpi_usbtmc_local(struct scpi_usbtmc_libusb *uscpi)
LIBUSB_ENDPOINT_IN |
LIBUSB_REQUEST_TYPE_CLASS |
LIBUSB_RECIPIENT_INTERFACE,
GO_TO_LOCAL, 1,
GO_TO_LOCAL, 0,
uscpi->interface,
&status, 1,
TRANSFER_TIMEOUT);