/****************************************************************************
* apps/graphics/ft80x/ft80x_touch.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/ioctl.h>
#include <stdint.h>
#include <signal.h>
#include <assert.h>
#include <errno.h>
#include <nuttx/lcd/ft80x.h>
#include "graphics/ft80x.h"
#include "ft80x.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: ft80x_touch_gettransform
*
* Description:
* Read the touch transform matrix
*
* Input Parameters:
* fd - The file descriptor of the FT80x device. Opened by the caller
* with write access.
* matrix - The location to return the transform matrix
*
* Returned Value:
* Zero (OK) on success. A negated errno value on failure.
*
****************************************************************************/
int ft80x_touch_gettransform(int fd, FAR uint32_t matrix[6])
{
int ret;
/* Read FT80X_REG_TOUCH_TRANSFORM_A through FT80X_REG_TOUCH_TRANSFORM_F */
#ifdef CONFIG_LCD_FT800
ret = ft80x_getregs(fd, FT80X_REG_TOUCH_TRANSFORM_A, 6, matrix);
#else
ret = ft80x_getregs(fd, FT80X_REG_CTOUCH_TRANSFORM_A, 6, matrix);
#endif
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getregs failed: %d\n", ret);
}
return ret;
}
/****************************************************************************
* Name: ft80x_touch_tag
*
* Description:
* Read the current touch tag. The touch tag is an 8-bit value
* identifying the specific graphics object on the screen that is being
* touched. The value zero indicates that there is no graphic object being
* touched.
*
* Only a single touch can be queried. For the FT801 in "extended",
* multi-touch mode, this value indicates only the tag associated with
* touch 0.
*
* Input Parameters:
* fd - The file descriptor of the FT80x device. Opened by the caller
* with write access.
*
* Returned Value:
* A value of 1-255 is returned if a graphics object is touched. Zero is
* returned if no graphics object is touched. A negated errno value on failure.
*
****************************************************************************/
int ft80x_touch_tag(int fd)
{
uint8_t tag;
int ret;
#if defined(CONFIG_LCD_FT800)
/* Read REG_TOUCH_TAG */
ret = ft80x_getreg8(fd, FT80X_REG_TOUCH_TAG, &tag);
#elif defined(CONFIG_LCD_FT801)
/* Read REG_CTOUCH_TAG */
ret = ft80x_getreg8(fd, FT80X_REG_CTOUCH_TAG, &tag);
#endif
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg8 failed: %d\n", ret);
return ret;
}
return (int)tag;
}
/****************************************************************************
* Name: ft80x_touch_waittag
*
* Description:
* Wait until there is a change in the touch tag.
*
* Input Parameters:
* fd - The file descriptor of the FT80x device. Opened by the caller
* with write access.
* oldtag - The previous tag value. This function will return when the
* current touch tag differs from this value.
*
* Returned Value:
* A value of 1-255 is returned if a graphics object is touched. Zero is
* returned if no graphics object is touched. A negated errno value on failure.
*
****************************************************************************/
int ft80x_touch_waittag(int fd, uint8_t oldtag)
{
struct ft80x_notify_s notify;
struct timespec timeout;
sigset_t set;
uint8_t tag;
int ret;
/* Block the signal so that it will pend if received asynchronously */
sigemptyset(&set);
sigaddset(&set, CONFIG_GRAPHICS_FT80X_TAG_SIGNAL);
ret = pthread_sigmask(SIG_BLOCK, &set, NULL);
if (ret < 0)
{
ret = -errno;
ft80x_err("ERROR: pthread_sigmask for signal %d failed: %d\n",
CONFIG_GRAPHICS_FT80X_TAG_SIGNAL, ret);
return ret;
}
notify.event.sigev_notify = SIGEV_SIGNAL;
notify.event.sigev_signo = CONFIG_GRAPHICS_FT80X_TAG_SIGNAL;
notify.pid = getpid();
notify.id = FT80X_NOTIFY_TAG;
notify.enable = false;
for (; ; )
{
/* Read the current touch tag. */
ret = ft80x_touch_tag(fd);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_touch_tag failed: %d\n", ret);
return ret;
}
/* Check if the touch tag has already changed */
tag = (uint8_t)(ret & 0xff);
ft80x_info("oldtag=%u tag=%u\n", oldtag, tag);
if (tag == oldtag)
{
/* The tag has changed... return success */
ret = OK;
break;
}
/* Set up to receive a notification when the touch tag changes.
* NOTE that there is a race condition here between the preceding test
* and the time when the event is registered. We catch this with a
* timeout below.
*/
notify.enable = true;
ret = ioctl(fd, FT80X_IOC_EVENTNOTIFY,
(unsigned long)((uintptr_t)¬ify));
if (ret < 0)
{
ret = -errno;
ft80x_err("ERROR: ioctl(FT80X_IOC_EVENTNOTIFY) failed: %d\n", ret);
break;
}
/* Now wait for the signal event (or a timeout) */
timeout.tv_sec = 0;
timeout.tv_nsec = 400 * 1000 * 1000;
ret = sigtimedwait(&set, NULL, &timeout);
/* Make sure that the event notification is again disabled */
notify.enable = false;
ioctl(fd, FT80X_IOC_EVENTNOTIFY,
(unsigned long)((uintptr_t)¬ify));
/* Check if the signal was received correctly or if the timeout occurred. */
if (ret < 0)
{
int errcode = errno;
if (errcode != EAGAIN)
{
ft80x_err("ERROR: ioctl(FT80X_IOC_EVENTNOTIFY) failed: %d\n",
errcode);
ret = -errcode;
break;
}
}
}
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
return tag;
}
/****************************************************************************
* Name: ft80x_touch_info
*
* Description:
* Return the current touch tag and touch position information.
*
* For the FT801 in "extended", multi-touch mode, the tag value indicates
* only the tag associated with touch 0.
*
* Touch positions of -32768 indicate that no touch is detected.
*
* Input Parameters:
* fd - The file descriptor of the FT80x device. Opened by the caller
* with write access.
* info - Location in which to return the touch information
*
* Returned Value:
* A value of 1-255 is returned if a graphics object is touched. Zero is
* returned if no graphics object is touched. A negated errno value on failure.
*
****************************************************************************/
int ft80x_touch_info(int fd, FAR struct ft80x_touchinfo_s *info)
{
int ret;
DEBUGASSERT(info != NULL);
#if defined(CONFIG_LCD_FT800)
/* Read REG_TOUCH_TAG */
ret = ft80x_getreg8(fd, FT80X_REG_TOUCH_TAG, &info->tag);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg8 failed: %d\n", ret);
return ret;
}
/* Read the FT80X_REG_TOUCH_TAG_XY register */
ret = ft80x_getreg32(fd, FT80X_REG_TOUCH_TAG_XY, &info->tagpos.xy);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg32 failed: %d\n", ret);
return ret;
}
/* Read the FT80X_REG_TOUCH_RZ register */
ret = ft80x_getreg16(fd, FT80X_REG_TOUCH_RZ,
(FAR uint16_t *)&info->pressure);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg16 failed: %d\n", ret);
return ret;
}
/* Read the FT80X_REG_TOUCH_SCREEN_XY register */
ret = ft80x_getreg32(fd, FT80X_REG_TOUCH_SCREEN_XY, &info->pos.xy);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg32 failed: %d\n", ret);
return ret;
}
#elif defined(CONFIG_LCD_FT801)
/* Read REG_CTOUCH_TAG */
ret = ft80x_getreg8(fd, FT80X_REG_CTOUCH_TAG, &info->tag);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg8 failed: %d\n", ret);
return ret;
}
/* Read the FT80X_REG_CTOUCH_TAG_XY register */
ret = ft80x_getreg32(fd, FT80X_REG_CTOUCH_TAG_XY, &info->tagpos.xy);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg32 failed: %d\n", ret);
return ret;
}
#ifndef CONFIG_LCD_FT801_MULTITOUCH
/* Read the FT80X_REG_CTOUCH_TOUCH0_XY register */
ret = ft80x_getreg32(fd, FT80X_REG_CTOUCH_TOUCH0_XY, &info->pos.xy);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg32 failed: %d\n", ret);
return ret;
}
#else
/* Read the FT80X_REG_CTOUCH_TOUCH0_XY register */
ret = ft80x_getreg32(fd, FT80X_REG_CTOUCH_TOUCH0_XY, &info->pos[0].xy);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg32 failed: %d\n", ret);
return ret;
}
/* Read the FT80X_REG_CTOUCH_TOUCH1_XY register */
ret = ft80x_getreg32(fd, FT80X_REG_CTOUCH_TOUCH1_XY, &info->pos[1].xy);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg32 failed: %d\n", ret);
return ret;
}
/* Read the FT80X_REG_CTOUCH_TOUCH2_XY register */
ret = ft80x_getreg32(fd, FT80X_REG_CTOUCH_TOUCH2_XY, &info->pos[2].xy);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg32 failed: %d\n", ret);
return ret;
}
/* Read the FT80X_REG_CTOUCH_TOUCH3_XY register */
ret = ft80x_getreg32(fd, FT80X_REG_CTOUCH_TOUCH3_XY, &info->pos[3].xy);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg32 failed: %d\n", ret);
return ret;
}
/* Read the FT80X_REG_CTOUCH_TOUCH4_X and Y registers */
ret = ft80x_getreg16(fd, FT80X_REG_CTOUCH_TOUCH4_X,
(FAR uint16_t *)&info->pos[4].u.x);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg16 failed: %d\n", ret);
return ret;
}
ret = ft80x_getreg16(fd, FT80X_REG_CTOUCH_TOUCH4_Y,
(FAR uint16_t *)&info->pos[4].u.y);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg16 failed: %d\n", ret);
return ret;
}
#endif /* CONFIG_LCD_FT801_MULTITOUCH */
#endif /* CONFIG_LCD_FT800/1 */
return OK;
}