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drivers/ft5x06.c: Add additional configuration options: Optimize if multi-touch capability is not used. Add options to swap X/Y and thresholding to reduce the rate of false alarm reports (with no motion).

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This commit is contained in:
Gregory Nutt
2017-12-18 10:31:49 -06:00
parent a0004173d4
commit 4a5e18a6db
4 changed files with 183 additions and 12 deletions
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drivers/input/ft5x06.c
+129 -5
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@@ -120,6 +120,12 @@ struct ft5x06_dev_s
* FT5x06 data */
volatile bool valid; /* True: New, valid touch data in
* touchbuf[] */
#ifdef CONFIG_FT5X06_SINGLEPOINT
uint8_t lastid; /* Last reported touch id */
uint8_t lastevent; /* Last reported event */
int16_t lastx; /* Last reported X position */
int16_t lasty; /* Last reported Y position */
#endif
sem_t devsem; /* Manages exclusive access to this
* structure */
sem_t waitsem; /* Used to wait for the
@@ -299,7 +305,12 @@ static void ft5x06_data_worker(FAR void *arg)
msg[0].buffer = &regaddr; /* Send one byte of data (no STOP) */
msg[0].length = 1;
/* Set up the data read operation */
/* Set up the data read operation.
*
* REVISIT: If CONFIG_FT5X06_SINGLEPOINT is selected, we we not just
* set the length for one sample? Or is there some reason why we have to
* read all of the points?
*/
msg[1].frequency = priv->frequency; /* I2C frequency */
msg[1].addr = config->address; /* 7-bit address */
@@ -427,6 +438,113 @@ static int ft5x06_data_interrupt(int irq, FAR void *context, FAR void *arg)
* Name: ft5x06_sample
****************************************************************************/
#ifdef CONFIG_FT5X06_SINGLEPOINT
static ssize_t ft5x06_sample(FAR struct ft5x06_dev_s *priv, FAR char *buffer,
size_t len)
{
FAR struct ft5x06_touch_data_s *raw;
FAR struct ft5x06_touch_point_s *touch;
FAR struct touch_sample_s *sample;
FAR struct touch_point_s *point;
int16_t x;
int16_t y;
uint8_t event;
uint8_t id;
if (!priv->valid)
{
return 0; /* Nothing to read */
}
/* Raw data pointers (source) */
raw = (FAR struct ft5x06_touch_data_s *)priv->touchbuf;
if (raw->tdstatus != 1)
{
priv->valid = false;
return 0; /* No touches read. */
}
/* Get the reported X and Y positions */
touch = raw->touch;
#ifdef CONFIG_FT5X06_SWAPXY
y = TOUCH_POINT_GET_X(touch[0]);
x = TOUCH_POINT_GET_Y(touch[0]);
#else
x = TOUCH_POINT_GET_X(touch[0]);
y = TOUCH_POINT_GET_Y(touch[0]);
#endif
/* Get the touch point ID and event */
event = TOUCH_POINT_GET_EVENT(touch[0]);
id = TOUCH_POINT_GET_ID(touch[0]);
if (id == priv->lastid && event == priv->lastevent)
{
int16_t deltax;
int16_t deltay;
/* Same ID and event.. Compare the change in position from the last
* report.
*/
deltax = (x - priv->lastx);
if (deltax < 0)
{
deltax = -deltax;
}
if (deltax < CONFIG_FT5X06_THRESHX)
{
/* There as been no significant change in X, try Y */
deltay = (y - priv->lasty);
if (deltay < 0)
{
deltay = -deltay;
}
if (deltax < CONFIG_FT5X06_THRESHX)
{
/* Ignore... no significant change in Y either */
priv->valid = false;
return 0; /* No new touches read. */
}
}
}
priv->lastid = id;
priv->lastevent = event;
priv->lastx = x;
priv->lasty = y;
/* User data buffer points (sink) */
/* Return the number of touches read */
sample = (FAR struct touch_sample_s *)buffer;
sample->npoints = 1;
/* Decode and return the single touch point */
point = sample->point;
point[0].id = id;
point[0].flags = g_event_map[event];
point[0].x = x;
point[0].y = y;
point[0].h = 0;
point[0].w = 0;
point[0].pressure = 0;
priv->valid = false;
return SIZEOF_TOUCH_SAMPLE_S(1);
}
#else
static ssize_t ft5x06_sample(FAR struct ft5x06_dev_s *priv, FAR char *buffer,
size_t len)
{
@@ -434,8 +552,8 @@ static ssize_t ft5x06_sample(FAR struct ft5x06_dev_s *priv, FAR char *buffer,
FAR struct ft5x06_touch_point_s *touch;
FAR struct touch_sample_s *sample;
FAR struct touch_point_s *point;
unsigned int ntouches;
unsigned int maxtouches;
unsigned int ntouches;
int i;
maxtouches = (len - sizeof(int)) / sizeof(struct touch_point_s);
@@ -454,6 +572,8 @@ static ssize_t ft5x06_sample(FAR struct ft5x06_dev_s *priv, FAR char *buffer,
/* Decode number of touches */
ntouches = raw->tdstatus;
DEBUGASSERT(ntouches <= FT5x06_MAX_TOUCHES);
if (ntouches > maxtouches)
{
ntouches = maxtouches;
@@ -465,8 +585,6 @@ static ssize_t ft5x06_sample(FAR struct ft5x06_dev_s *priv, FAR char *buffer,
return 0; /* No touches read. */
}
DEBUGASSERT(ntouches <= FT5x06_MAX_TOUCHES);
/* User data buffer points (sink) */
sample = (FAR struct touch_sample_s *)buffer;
@@ -478,14 +596,19 @@ static ssize_t ft5x06_sample(FAR struct ft5x06_dev_s *priv, FAR char *buffer,
/* Decode and return the touch points */
for (i = 0; i < raw->tdstatus; i++)
for (i = 0; i < ntouches; i++)
{
int event = TOUCH_POINT_GET_EVENT(touch[i]);
point[i].id = TOUCH_POINT_GET_ID(touch[i]);
point[i].flags = g_event_map[event];
#ifdef CONFIG_FT5X06_SWAPXY
point[i].y = TOUCH_POINT_GET_X(touch[i]);
point[i].x = TOUCH_POINT_GET_Y(touch[i]);
#else
point[i].x = TOUCH_POINT_GET_X(touch[i]);
point[i].y = TOUCH_POINT_GET_Y(touch[i]);
#endif
point[i].h = 0;
point[i].w = 0;
point[i].pressure = 0;
@@ -494,6 +617,7 @@ static ssize_t ft5x06_sample(FAR struct ft5x06_dev_s *priv, FAR char *buffer,
priv->valid = false;
return SIZEOF_TOUCH_SAMPLE_S(ntouches);
}
#endif /* CONFIG_FT5X06_SINGLEPOINT */
/****************************************************************************
* Name: ft5x06_waitsample