OpenUSB Developers Guide
PrevNext

openusb_get_altsetting,openusb_set_altsetting

Name

openusb_get_altsetting,openusb_set_altsetting -- Get alternate setting number, Set alternate setting

Synopsis

int32_t openusb_get_altsetting(openusb_dev_handle_t dev, uint8_t ifc, openusb_init_flag_t* alt);

int32_topenusb_set_altsetting(openusb_dev_handle_t dev, uint8_t ifc, uint8_t alt);

Parameters

dev - Device handle.

ifc - Interface number.

alt - Alternate setting number

Description

openusb_get_altsetting() get the current alternate setting number of interface ifc. The alternate number is returned in alt.

openusb_set_altsetting() sets the active alternate setting of the interface ifc. Application should call this function to set proper alternate setting of an interface before doing data transfer on endpoints in that setting.

Return Value

openusb_get_altsetting(), openusb_set_altsetting() returns 0 on success. Otherwise, a openusb error is returned.

OPENUSB_SUCCESS No errors.

OPENUSB_BADARG ifc or alt is not valid.

OPENUSB_UNKNOWN_DEVICE Device handle is not valid

OPENUSB_PLATFORM_FAILURE Unspecified kernel/driver failure

OPENUSB_BUSY The interface ifc has already been claimed.

See Also

openusb_claim_interface, openusb_release_interface, openusb_is_interface_claimed

PrevHomeNext
openusb_claim_interface, openusb_release_interface, openusb_is_interface_claimedUpopenusb_reset