131 lines
4.3 KiB
C
131 lines
4.3 KiB
C
/****************************************************************************
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* apps/graphics/ft80x/ft80x_ramdl.c
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*
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* Copyright (C) 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/ioctl.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/lcd/ft80x.h>
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#include "graphics/ft80x.h"
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#include "ft80x.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ft80x_ramdl_rewind
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*
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* Description:
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* Reset to the start of RAM DL memory
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*
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* Input Parameters:
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* fd - The file descriptor of the FT80x device. Opened by the caller
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* with write access.
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*
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* Returned Value:
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* Zero (OK) on success. A negated errno value on failure.
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*
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****************************************************************************/
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int ft80x_ramdl_rewind(int fd)
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{
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off_t pos;
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/* Reposition the VFSso that subsequent writes will be to the beginning of
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* the hardware display list.
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*/
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pos = lseek(fd, 0, SEEK_SET);
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if (pos < 0)
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{
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int errcode = errno;
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ft80x_err("ERROR: lseek failed: %d\n", errcode);
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return -errcode;
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}
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return OK;
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}
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/****************************************************************************
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* Name: ft80x_ramdl_append
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*
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* Description:
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* Append new display list data to RAM DL
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*
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* Input Parameters:
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* fd - The file descriptor of the FT80x device. Opened by the caller
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* with write access.
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* data - A pointer to the start of the data to be written.
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* len - The number of bytes to be written.
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*
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* Returned Value:
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* Zero (OK) on success. A negated errno value on failure.
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*
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****************************************************************************/
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int ft80x_ramdl_append(int fd, FAR const void *data, size_t len)
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{
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size_t nwritten;
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DEBUGASSERT(data != NULL && ((uintptr_t)data & 3) == 0 &&
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len > 0 && (len & 3) == 0);
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/* Write the aligned data directly to the FT80x hardware display list.
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*
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* NOTE: We have inside knowledge that the write will complete in a
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* single operation so that no piecewise writes will ever be necessary.
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*/
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nwritten = write(fd, data, len);
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if (nwritten < 0)
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{
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int errcode = errno;
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ft80x_err("ERROR: write failed: %d\n", errcode);
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return -errcode;
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}
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DEBUGASSERT(nwritten == len);
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return OK;
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} |