USBD_CtrlTx

Description

Sends data on control IN endpoint.

Files

usbd_core.h/usbd_ep.c

Prototype

Arguments

dev_nbr

Device number.

p_buf

Pointer to buffer of data that will be sent

buf_len

Number of octets to transmit.

timeout_ms

Timeout in milliseconds.

end

End-of-transfer flag (see Note #1).

p_err

Pointer to variable that will receive the return error code from this function.

USBD_ERR_NONE

USBD_ERR_INVALID_ARG

USBD_ERR_DEV_INVALID_NBR

USBD_ERR_DEV_INVALID_STATE

USBD_ERR_EP_INVALID_ADDR

USBD_ERR_EP_INVALID_STATE

USBD_ERR_EP_INVALID_TYPE

USBD_ERR_OS_TIMEOUT

USBD_ERR_OS_ABORT

USBD_ERR_OS_FAIL

Returned Value

Number of octets transmitted, if no errors.

0, otherwise.

Callers

Classes.

Notes / Warnings

1. If end-of-transfer is set and transfer length is multiple of maximum packet size, a zero-length packet is transferred to indicate a short transfer to the host.
2. This function can be only called from USB device class drivers during class specific setup request callbacks.