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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Printer Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_printer.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_printer_write PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function writes to the printer interface. The call is blocking */
/* and only returns when there is either an error or when the transfer */
/* is complete. */
/* */
/* INPUT */
/* */
/* printer Pointer to printer class */
/* data_pointer Pointer to data to write */
/* requested_length Length of data to write */
/* actual_length Actual length of data written */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_transfer_request Process transfer request */
/* _ux_host_stack_transfer_request_abort Abort transfer request */
/* _ux_utility_semaphore_get Get protection semaphore */
/* _ux_utility_semaphore_put Release protection semaphore */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* prefixed UX to MS_TO_TICK, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _ux_host_class_printer_write(UX_HOST_CLASS_PRINTER *printer, UCHAR * data_pointer,
ULONG requested_length, ULONG *actual_length)
{
UX_TRANSFER *transfer_request;
UINT status;
ULONG transfer_request_length;
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_CLASS_PRINTER_WRITE, printer, data_pointer, requested_length, 0, UX_TRACE_HOST_CLASS_EVENTS, 0, 0)
/* Ensure the instance is valid. */
if (printer -> ux_host_class_printer_state != UX_HOST_CLASS_INSTANCE_LIVE)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_INSTANCE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_INSTANCE_UNKNOWN, printer, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_HOST_CLASS_INSTANCE_UNKNOWN);
}
/* Protect thread reentry to this instance. */
status = _ux_utility_semaphore_get(&printer -> ux_host_class_printer_semaphore, UX_WAIT_FOREVER);
if (status != UX_SUCCESS)
/* Return error. */
return(status);
/* Start by resetting the actual length of the transfer. */
*actual_length = 0;
/* Get the pointer to the bulk out endpoint transfer request. */
transfer_request = &printer -> ux_host_class_printer_bulk_out_endpoint -> ux_endpoint_transfer_request;
/* Perform a transfer on the bulk out endpoint until either the transfer is
completed or when there is an error. */
while (requested_length)
{
/* Program the maximum authorized length for this transfer_request. */
if (requested_length > transfer_request -> ux_transfer_request_maximum_length)
transfer_request_length = transfer_request -> ux_transfer_request_maximum_length;
else
transfer_request_length = requested_length;
/* Initialize the transfer_request. */
transfer_request -> ux_transfer_request_data_pointer = data_pointer;
transfer_request -> ux_transfer_request_requested_length = transfer_request_length;
/* Perform the transfer. */
status = _ux_host_stack_transfer_request(transfer_request);
/* If the transfer is successful, we need to wait for the transfer request to be completed. */
if (status == UX_SUCCESS)
{
/* Wait for the completion of the transfer request. */
status = _ux_utility_semaphore_get(&transfer_request -> ux_transfer_request_semaphore, UX_MS_TO_TICK(UX_HOST_CLASS_PRINTER_CLASS_TRANSFER_TIMEOUT));
/* If the semaphore did not succeed we probably have a time out. */
if (status != UX_SUCCESS)
{
/* All transfers pending need to abort. There may have been a partial transfer. */
_ux_host_stack_transfer_request_abort(transfer_request);
/* Update the length of the actual data transferred. We do this after the
abort of the transfer_request in case some data actually went out. */
*actual_length += transfer_request -> ux_transfer_request_actual_length;
/* Unprotect thread reentry to this instance. */
status = _ux_utility_semaphore_put(&printer -> ux_host_class_printer_semaphore);
/* Set the completion code. */
transfer_request -> ux_transfer_request_completion_code = UX_TRANSFER_TIMEOUT;
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_TRANSFER_TIMEOUT);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_TRANSFER_TIMEOUT, transfer_request, 0, 0, UX_TRACE_ERRORS, 0, 0)
/* There was an error, return to the caller. */
return(UX_TRANSFER_TIMEOUT);
}
}
else
{
/* Unprotect thread reentry to this instance. */
status = _ux_utility_semaphore_put(&printer -> ux_host_class_printer_semaphore);
/* There was a non transfer error, no partial transfer to be checked */
return(status);
}
/* Update the length of the transfer. Normally all the data has to be sent. */
*actual_length += transfer_request -> ux_transfer_request_actual_length;
/* Check for completion of transfer. If the transfer is partial, return to caller.
The transfer is marked as successful but the caller will need to check the length
actually sent and determine if a partial transfer is OK. */
if (transfer_request_length != transfer_request -> ux_transfer_request_actual_length)
{
/* Unprotect thread reentry to this instance. */
status = _ux_utility_semaphore_put(&printer -> ux_host_class_printer_semaphore);
/* Return success. */
return(UX_SUCCESS);
}
/* Update the data pointer for next transfer. */
data_pointer += transfer_request_length;
/* Update what is left to send out. */
requested_length -= transfer_request_length;
}
/* Unprotect thread reentry to this instance. */
status = _ux_utility_semaphore_put(&printer -> ux_host_class_printer_semaphore);
/* We get here when all the transfers went through without errors. */
return(UX_SUCCESS);
}
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