565 lines
16 KiB
C
565 lines
16 KiB
C
/****************************************************************************
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* apps/graphics/ft80x/ft80x_dl.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/types.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <string.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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#ifdef CONFIG_GRAPHICS_FT80X
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ft80x_dl_dump
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*
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* Description:
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* Dump the content of the display list to stdout as it is written from
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* the local display buffer to hardware.
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*
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* Input Parameters:
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* buffer - An instance of struct ft80x_dlbuffer_s allocated by the caller.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#ifdef GRAPHICS_FT80X_DEBUG_INFO
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static void ft80x_dl_dump(FAR struct ft80x_dlbuffer_s *buffer)
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{
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uint16_t nwords;
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int max;
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int i;
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int j;
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printf("Write display list: dlsize=%lu dloffset=%lu\n",
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(unsigned long)buffer->dlsize, (unsigned long)buffer->dloffset);
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nwords = buffer->dloffset >> 2;
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for (i = 0; i < nwords; i += 8)
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{
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printf(" %04x: ", i << 2);
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max = i + 4;
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if (max >= nwords)
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{
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max = nwords - i;
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}
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for (j = i; j < max; j++)
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{
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printf(" %08x", buffer->dlbuffer[j]);
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}
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putchar(' ');
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max = i + 8;
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if (i + max >= nwords)
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{
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max = nwords - i;
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}
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for (j = i + 4; j < max; j++)
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{
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printf(" %08x", buffer->dlbuffer[j]);
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}
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putchar('\n');
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}
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ft80x_dl_start
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*
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* Description:
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* Start a new display list. This function will:
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*
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* 1) Set the total display size to zero
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* 2) Set the display list buffer offset to zero
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* 3) Reposition the VFS so that subsequent writes will be to the
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* beginning of the hardware display list.
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* 4) Write the CMD_DLSTART command into the local display list buffer.
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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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* buffer - An instance of struct ft80x_dlbuffer_s allocated by the caller.
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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_dl_start(int fd, FAR struct ft80x_dlbuffer_s *buffer)
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{
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struct ft80x_cmd_dlstart_s dlstart;
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off_t pos;
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ft80x_info("fd=%d buffer=%p\n", fd, buffer);
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DEBUGASSERT(fd >= 0 && buffer != NULL);
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/* 1) Set the total display size to zero
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* 2) Set the display list buffer offset to zero
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*/
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buffer->dlsize = 0;
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buffer->dloffset = 0;
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/* 3) Reposition the VFS so that subsequent writes will be to the
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* beginning of 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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/* 4) Write the CMD_DLSTART command into the local display list buffer. */
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dlstart.cmd = FT80X_CMD_DLSTART;
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return ft80x_dl_data(fd, buffer, &dlstart,
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sizeof(struct ft80x_cmd_dlstart_s));
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}
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/****************************************************************************
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* Name: ft80x_dl_end
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*
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* Description:
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* Terminate the display list. This function will:
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*
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* 1) Add the DISPLAY command to the local display list buffer to finish
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* the last display
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* 2) Add the CMD_DLSWAP command to the local display list buffer to swap
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* to the newly created display list.
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* 3) Flush the local display buffer to hardware and set the display list
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* buffer offset to zero.
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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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* buffer - An instance of struct ft80x_dlbuffer_s allocated by the caller.
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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_dl_end(int fd, FAR struct ft80x_dlbuffer_s *buffer)
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{
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union
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{
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struct ft80x_dlcmd_s display;
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struct ft80x_cmd_swap_s swap;
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} u;
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int ret;
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ft80x_info("fd=%d buffer=%p\n", fd, buffer);
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DEBUGASSERT(fd >= 0 && buffer != NULL);
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/* 1) Add the DISPLAY command to the local display list buffer to finish
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* the last display
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*/
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u.display.cmd = FT80X_DISPLAY();
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ret = ft80x_dl_data(fd, buffer, &u.display, sizeof(struct ft80x_dlcmd_s));
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if (ret < 0)
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{
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ft80x_err("ERROR: ft80x_dl_data failed: %d\n", ret);
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return ret;
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}
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/* 2) Add the CMD_DLSWAP command to the local display list buffer to swap
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* to the newly created display list.
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*/
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u.swap.cmd = FT80X_CMD_SWAP;
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ret = ft80x_dl_data(fd, buffer, &u.swap, sizeof(struct ft80x_cmd_swap_s));
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if (ret < 0)
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{
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ft80x_err("ERROR: ft80x_dl_data failed: %d\n", ret);
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return ret;
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}
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/* 3) Flush the local display buffer to hardware and set the display list
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* buffer offset to zero.
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*/
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ret = ft80x_dl_flush(fd, buffer);
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if (ret < 0)
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{
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ft80x_err("ERROR: ft80x_dl_flush failed: %d\n", ret);
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}
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return ret;
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}
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/****************************************************************************
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* Name: ft80x_dl_data
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*
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* Description:
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* Add data to the display list and increment the display list buffer
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* offset. If the data will not fit into the local display buffer, then
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* the local display buffer will first be flushed to hardware in order to
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* free up space.
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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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* buffer - An instance of struct ft80x_dlbuffer_s allocated by the caller.
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* data - The data to be added to the display list
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* datlen - The length of the data to be added to the display list. If
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* this is not an even multiple of 4 bytes, then the actual length
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* will be padded with zero bytes to achieve alignment.
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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_dl_data(int fd, FAR struct ft80x_dlbuffer_s *buffer,
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FAR const void *data, size_t datlen)
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{
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FAR uint8_t *bufptr;
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size_t padlen;
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int ret;
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ft80x_info("fd=%d buffer=%p data=%p datlen=%u\n", fd, buffer, data, datlen);
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DEBUGASSERT(fd >= 0 && buffer != NULL && data != NULL && datlen > 0);
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if (datlen > 0)
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{
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/* This is the length of the data after alignment */
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padlen = (datlen + 3) & ~3;
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if (padlen != datlen)
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{
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ft80x_warn("WARNING: Length padded to %u->%u\n", datlen, padlen);
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}
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/* Is there enough space in the local display list buffer to hold the
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* new data?
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*/
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if ((size_t)buffer->dloffset + padlen > FT80X_DL_BUFSIZE)
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{
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/* No... flush the local buffer */
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ret = ft80x_dl_flush(fd, buffer);
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if (ret < 0)
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{
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ft80x_err("ERROR: ft80x_dl_flush failed: %d\n", ret);
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return ret;
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}
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}
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/* Special case: The new data won't fit into our local display list
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* buffer.
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*/
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if (padlen > FT80X_DL_BUFSIZE)
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{
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size_t writelen;
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size_t nwritten;
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/* Write the aligned portion of the data directly to the FT80x
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* hardware display list. NOTE: We have inside knowledge that
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* the write will complete in a single operation so that no
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* piecewise writes will ever be necessary.
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*/
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writelen = datlen & ~3;
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nwritten = write(fd, data, writelen);
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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 == writelen);
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/* Is there any unaligned remainder? If the original data length
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* was aligned, then we should have writelen == datlen == padlen.
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* If it the length was unaligned, then we should have writelen <
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* datlen < padlen
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*/
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if (writelen < datlen)
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{
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/* Yes... we will handle the unaligned bytes below. */
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data = (FAR void *)((uintptr_t)data + writelen);
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datlen -= writelen;
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padlen -= writelen;
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}
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else
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{
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/* No.. then we are finished */
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return OK;
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}
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}
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/* Copy the data into the local display list buffer */
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bufptr = (FAR uint8_t *)buffer->dlbuffer;
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bufptr += buffer->dloffset;
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memcpy(bufptr, data, datlen);
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bufptr += datlen;
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buffer->dloffset += datlen;
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/* Then append zero bytes as necessary to achieve alignment */
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while (datlen < padlen)
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{
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*bufptr++ = 0;
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buffer->dloffset++;
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datlen++;
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}
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}
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return OK;
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}
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/****************************************************************************
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* Name: ft80x_dl_string
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*
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* Description:
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* Add the string along with its NUL terminator to the display list and
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* increment the display list buffer offset. If the length of the string
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* with its NUL terminator is not an even multiple of 4 bytes, then the
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* actual length will be padded with zero bytes to achieve alignment.
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*
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* If the data will not fit into the local display buffer, then the local
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* display buffer will first be flushed to hardware in order to free up
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* space.
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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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* buffer - An instance of struct ft80x_dlbuffer_s allocated by the caller.
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* str - The string to be added to the display list. If NUL, then a
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* NUL string will be added to the display list.
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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_dl_string(int fd, FAR struct ft80x_dlbuffer_s *buffer,
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FAR const char *str)
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{
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FAR uint8_t *bufptr;
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int datlen;
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int padlen;
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int ret;
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ft80x_info("fd=%d buffer=%p str=%p\n", fd, buffer, str);
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DEBUGASSERT(fd >= 0 && buffer != NULL);
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/* Get the length the the string (excluding the NUL terminator) */
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if (str == NULL)
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{
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str = "";
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datlen = 0;
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}
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else
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{
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datlen = strlen(str);
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}
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/* This is the length of the string after the NUL terminator is added and
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* the length is aligned to 32-bit boundary alignment.
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*/
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padlen = (datlen + 4) & ~3;
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if (padlen != (datlen + 1))
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{
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ft80x_warn("WARNING: Length padded to %u->%u\n", datlen, padlen);
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}
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/* Is there enough space in the local display list buffer to hold the new
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* string?
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*/
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if ((size_t)buffer->dloffset + padlen > FT80X_DL_BUFSIZE)
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{
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/* No... flush the local buffer */
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ret = ft80x_dl_flush(fd, buffer);
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if (ret < 0)
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{
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ft80x_err("ERROR: ft80x_dl_flush failed: %d\n", ret);
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return ret;
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}
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}
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/* Special case: The new string won't fit into our local display list
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* buffer.
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*/
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if (padlen > FT80X_DL_BUFSIZE)
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{
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size_t writelen;
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size_t nwritten;
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/* Write the aligned portion of the string directly to the FT80x
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* hardware display list. NOTE: We have inside knowledge that the
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* write will complete in a single operation so that no piecewise
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* writes will ever be necessary.
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*/
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writelen = datlen & ~3;
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nwritten = write(fd, str, writelen);
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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 == writelen);
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/* There should always be an unaligned remainder If the original
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* string length was aligned, then we should have writelen == datlen <
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* padlen. If it the length was unaligned, then we should have
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* writelen < datlen < padlen
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*/
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DEBUGASSERT(writelen < padlen);
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/* We will handle the unaligned remainder below. */
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str = &str[writelen];
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datlen -= writelen;
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padlen -= writelen;
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}
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/* Copy the data into the local display list buffer */
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bufptr = (FAR uint8_t *)buffer->dlbuffer;
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bufptr += buffer->dloffset;
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strcpy((FAR char *)bufptr, str);
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/* NOTE: that strcpy will copy the NUL terminator too */
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datlen++;
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/* Update pointers/offsets */
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bufptr += datlen;
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buffer->dloffset += datlen;
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/* Then append zero bytes as necessary to achieve alignment */
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while (datlen < padlen)
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{
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*bufptr++ = 0;
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buffer->dloffset++;
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datlen++;
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}
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return OK;
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}
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/****************************************************************************
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* Name: ft80x_dl_flush
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*
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* Description:
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* Flush the current contents of the local local display list buffer to
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* hardware and reset the local display list buffer offset to zero.
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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 with
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* write access.
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* buffer - An instance of struct ft80x_dlbuffer_s allocated by the caller.
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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_dl_flush(int fd, FAR struct ft80x_dlbuffer_s *buffer)
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{
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size_t nwritten;
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ft80x_info("fd=%d buffer=%p\n", fd, buffer);
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DEBUGASSERT(fd >= 0 && buffer != NULL);
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/* Write the content of the local display buffer to hardware. NOTE: We
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* have inside knowledge that the write will complete in a single
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* operation so that no piecewise writes will ever be necessary.
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*/
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nwritten = write(fd, buffer->dlbuffer, buffer->dloffset);
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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 == buffer->dloffset);
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buffer->dloffset = 0;
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return OK;
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}
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#endif /* CONFIG_GRAPHICS_FT80X */
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