Kerry Martin
KSM edits to RA8875
Diff: RA8875_Touch.cpp
- Revision:
- 83:7bad0068cca0
- Parent:
- 81:01da2e34283d
- Child:
- 85:022bba13c5c4
--- a/RA8875_Touch.cpp Tue Dec 30 23:45:37 2014 +0000
+++ b/RA8875_Touch.cpp Thu Jan 01 20:35:37 2015 +0000
@@ -3,6 +3,9 @@
#include "RA8875.h"
+#define NOTOUCH_TIMEOUT_uS 100000
+#define TOUCH_TICKER_uS 1000
+
// ### Touch Panel support code additions begin here
RetCode_t RA8875::TouchPanelInit(void)
@@ -13,6 +16,11 @@
WriteCommand(TPCR1, TP_MODE_DEFAULT | TP_DEBOUNCE_DEFAULT);
WriteCommand(INTC1, ReadCommand(INTC1) | RA8875_INT_TP); // reg INTC1: Enable Touch Panel Interrupts (D2 = 1)
WriteCommand(INTC2, RA8875_INT_TP); // reg INTC2: Clear any TP interrupt flag
+ touchSample = 0;
+ touchState = no_cal;
+ touchTicker.attach_us(this, &RA8875::_TouchTicker, TOUCH_TICKER_uS);
+ touchTimer.start();
+ touchTimer.reset();
return noerror;
}
@@ -34,6 +42,16 @@
// Set up the interrupt flag and enable bits
WriteCommand(INTC1, ReadCommand(INTC1) | RA8875_INT_TP); // reg INTC1: Enable Touch Panel Interrupts (D2 = 1)
WriteCommand(INTC2, RA8875_INT_TP); // reg INTC2: Clear any TP interrupt flag
+ touchSample = 0;
+ touchState = no_cal;
+ if (bTpEnable == TP_ENABLE) {
+ touchTicker.attach_us(this, &RA8875::_TouchTicker, TOUCH_TICKER_uS);
+ touchTimer.start();
+ touchTimer.reset();
+ } else {
+ touchTicker.detach();
+ touchTimer.stop();
+ }
return noerror;
}
@@ -60,8 +78,10 @@
{
point_t pTest[3];
point_t pSample[3];
- loc_t x,y;
+ int x,y;
+ while (TouchPanelA2DFiltered(&x, &y))
+ wait_ms(20);
cls();
if (msg)
puts(msg);
@@ -145,32 +165,32 @@
* operations to scale results by a factor of 2 or even 4.
*
*/
-bool RA8875::TouchPanelReadable(point_t * TouchPoint)
+TouchCode_t RA8875::TouchPanelReadable(point_t * TouchPoint)
{
- bool touched = false;
- point_t screenpoint = {0, 0};
+ int a2dX = 0;
+ int a2dY = 0;
- if (TouchPanelA2DFiltered(&screenpoint.x, &screenpoint.y)) {
- touched = true;
+ TouchCode_t ts = TouchPanelA2DFiltered(&a2dX, &a2dY);
+ if (ts != no_touch) {
if (tpMatrix.Divider != 0 && TouchPoint) {
/* Operation order is important since we are doing integer */
/* math. Make sure you add all terms together before */
/* dividing, so that the remainder is not rounded off */
/* prematurely. */
- TouchPoint->x = ( (tpMatrix.An * screenpoint.x) +
- (tpMatrix.Bn * screenpoint.y) +
+ TouchPoint->x = ( (tpMatrix.An * a2dX) +
+ (tpMatrix.Bn * a2dY) +
tpMatrix.Cn
) / tpMatrix.Divider ;
- TouchPoint->y = ( (tpMatrix.Dn * screenpoint.x) +
- (tpMatrix.En * screenpoint.y) +
+ TouchPoint->y = ( (tpMatrix.Dn * a2dX) +
+ (tpMatrix.En * a2dY) +
tpMatrix.Fn
) / tpMatrix.Divider ;
} else {
- touched = false;
+ ts = no_cal;
}
}
- return touched;
+ return ts;
}
@@ -179,27 +199,76 @@
if (matrixPtr == NULL || matrixPtr->Divider == 0)
return bad_parameter;
memcpy(&tpMatrix, matrixPtr, sizeof(tpMatrix_t));
+ touchState = no_touch;
return noerror;
}
-bool RA8875::TouchPanelA2DFiltered(loc_t *x, loc_t *y)
+static void InsertionSort(int * buf, int bufsize)
+{
+ int i, j;
+ int temp;
+
+ for(i = 1; i <= bufsize; i++) {
+ temp = buf[i];
+ j = i;
+ while( j && (buf[j-1] > temp) ) {
+ buf[j] = buf[j-1];
+ j = j-1;
+ }
+ buf[j] = temp;
+ } // End of sort
+}
+
+
+void RA8875::_TouchTicker(void)
{
- unsigned char touchready;
- static int xbuf[TPBUFSIZE], ybuf[TPBUFSIZE], sample = 0;
- int i, j, temp;
+ if (touchTimer.read_us() > NOTOUCH_TIMEOUT_uS) {
+ touchSample = 0;
+ if (touchState == held)
+ touchState = release;
+ else
+ touchState = no_touch;
+ touchTimer.reset();
+ }
+}
+
+TouchCode_t RA8875::TouchPanelA2DRaw(int *x, int *y)
+{
+ if( (ReadCommand(INTC2) & RA8875_INT_TP) ) { // Test for TP Interrupt pending in register INTC2
+ touchTimer.reset();
+ *y = ReadCommand(TPYH) << 2 | ( (ReadCommand(TPXYL) & 0xC) >> 2 ); // D[9:2] from reg TPYH, D[1:0] from reg TPXYL[3:2]
+ *x = ReadCommand(TPXH) << 2 | ( (ReadCommand(TPXYL) & 0x3) ); // D[9:2] from reg TPXH, D[1:0] from reg TPXYL[1:0]
+ WriteCommand(INTC2, RA8875_INT_TP); // reg INTC2: Clear that TP interrupt flag
+ touchState = touch;
+ } else {
+ touchState = no_touch;
+ }
+ return touchState;
+}
+
+TouchCode_t RA8875::TouchPanelA2DFiltered(int *x, int *y)
+{
+ static int xbuf[TPBUFSIZE], ybuf[TPBUFSIZE];
+ static int lastX, lastY;
+ int i, j;
+ TouchCode_t ret = touchState;
if( (ReadCommand(INTC2) & RA8875_INT_TP) ) { // Test for TP Interrupt pending in register INTC2
+ touchTimer.reset();
// Get the next data samples
- ybuf[sample] = ReadCommand(TPYH) << 2 | ( (ReadCommand(TPXYL) & 0xC) >> 2 ); // D[9:2] from reg TPYH, D[1:0] from reg TPXYL[3:2]
- xbuf[sample] = ReadCommand(TPXH) << 2 | ( (ReadCommand(TPXYL) & 0x3) ); // D[9:2] from reg TPXH, D[1:0] from reg TPXYL[1:0]
+ ybuf[touchSample] = ReadCommand(TPYH) << 2 | ( (ReadCommand(TPXYL) & 0xC) >> 2 ); // D[9:2] from reg TPYH, D[1:0] from reg TPXYL[3:2]
+ xbuf[touchSample] = ReadCommand(TPXH) << 2 | ( (ReadCommand(TPXYL) & 0x3) ); // D[9:2] from reg TPXH, D[1:0] from reg TPXYL[1:0]
// Check for a complete set
- if(++sample == TPBUFSIZE) {
+ if(++touchSample == TPBUFSIZE) {
// Buffers are full, so process them using Finn's method described in Analog Dialogue No. 44, Feb 2010
// This requires sorting the samples in order of size, then discarding the top 25% and
// bottom 25% as noise spikes. Finally, the middle 50% of the values are averaged to
// reduce Gaussian noise.
-
+#if 1
+ InsertionSort(ybuf, TPBUFSIZE);
+ InsertionSort(xbuf, TPBUFSIZE);
+#else
// Sort the Y buffer using an Insertion Sort
for(i = 1; i <= TPBUFSIZE; i++) {
temp = ybuf[i];
@@ -220,44 +289,49 @@
}
xbuf[j] = temp;
} // End of X sort
+#endif
// Average the middle half of the Y values and report them
j = 0;
for(i = (TPBUFSIZE/4) - 1; i < TPBUFSIZE - TPBUFSIZE/4; i++ ) {
j += ybuf[i];
}
- *y = j * (float)2/TPBUFSIZE; // This is the average
+ *y = lastY = j * (float)2/TPBUFSIZE; // This is the average
// Average the middle half of the X values and report them
j = 0;
for(i = (TPBUFSIZE/4) - 1; i < TPBUFSIZE - TPBUFSIZE/4; i++ ) {
j += xbuf[i];
}
- *x = j * (float)2/TPBUFSIZE; // This is the average
+ *x = lastX = j * (float)2/TPBUFSIZE; // This is the average
// Tidy up and return
- touchready = 1;
- sample = 0; // Ready to start on the next set of data samples
+ if (touchState == touch || touchState == held)
+ touchState = held;
+ else
+ touchState = touch;
+ ret = touchState;
+ touchSample = 0; // Ready to start on the next set of data samples
} else {
// Buffer not yet full, so do not return any results yet
- touchready = 0;
+ if (touchState == touch || touchState == held) {
+ *x = lastX;
+ *y = lastY;
+ ret = touchState = held;
+ }
}
WriteCommand(INTC2, RA8875_INT_TP); // reg INTC2: Clear that TP interrupt flag
} // End of initial if -- data has been read and processed
- else
- touchready = 0; // Touch Panel "Int" was not set
- return touchready;
-}
-
-bool RA8875::TouchPanelA2DRaw(loc_t *x, loc_t *y)
-{
- unsigned char touchready;
-
- if( (ReadCommand(INTC2) & RA8875_INT_TP) ) { // Test for TP Interrupt pending in register INTC2
- *y = ReadCommand(TPYH) << 2 | ( (ReadCommand(TPXYL) & 0xC) >> 2 ); // D[9:2] from reg TPYH, D[1:0] from reg TPXYL[3:2]
- *x = ReadCommand(TPXH) << 2 | ( (ReadCommand(TPXYL) & 0x3) ); // D[9:2] from reg TPXH, D[1:0] from reg TPXYL[1:0]
- WriteCommand(INTC2, RA8875_INT_TP); // reg INTC2: Clear that TP interrupt flag
- touchready = 1;
- } else
- touchready = 0;
- return touchready;
+ else {
+ if (touchState == touch || touchState == held) {
+ *x = lastX;
+ *y = lastY;
+ ret = touchState = held;
+ } else if (touchState == release) {
+ *x = lastX;
+ *y = lastY;
+ ret = release;
+ touchState = no_touch;
+ }
+ }
+ return ret;
}
/* The following section is derived from Carlos E. Vidales.
@@ -451,6 +525,7 @@
tpMatrix.Fn = (screenPtr[2].x * displayPtr[1].y - screenPtr[1].x * displayPtr[2].y) * screenPtr[0].y +
(screenPtr[0].x * displayPtr[2].y - screenPtr[2].x * displayPtr[0].y) * screenPtr[1].y +
(screenPtr[1].x * displayPtr[0].y - screenPtr[0].x * displayPtr[1].y) * screenPtr[2].y ;
+ touchState = no_touch;
if (matrixPtr)
memcpy(matrixPtr, &tpMatrix, sizeof(tpMatrix_t));
}