David Smart / RA8875 Featured

Library to control a Graphics TFT connected to 4-wire SPI - revised for the Raio RA8875 Display Controller.

Dependents:   FRDM_RA8875_mPaint RA8875_Demo RA8875_KeyPadDemo SignalGenerator ... more

Fork of SPI_TFT by Peter Drescher

See Components - RA8875 Based Display

Enhanced touch-screen support - where it previous supported both the Resistive Touch and Capacitive Touch based on the FT5206 Touch Controller, now it also has support for the GSL1680 Touch Controller.

Offline Help Manual (Windows chm)

/media/uploads/WiredHome/ra8875.zip.bin (download, rename to .zip and unzip)

Diff: RA8875_Touch.cpp

Revision:
157:1565f38ca44b
Parent:
155:b3f225ae572c
Child:
165:695c24cc5197
--- a/RA8875_Touch.cpp	Mon Nov 19 02:21:41 2018 +0000
+++ b/RA8875_Touch.cpp	Wed Jan 02 23:42:15 2019 +0000
@@ -57,6 +57,8 @@
 
 RetCode_t RA8875::TouchPanelInit(void)
 {
+    RetCode_t r = noerror;
+    
     panelTouched = false;
     if (useTouchPanel == TP_CAP) {
         // Set to normal mode
@@ -81,8 +83,9 @@
         
         touchTimer.start();
         touchTimer.reset();
+        r = _internal_ts_cal();
     }
-    return noerror;
+    return r;
 }
 
 
@@ -125,6 +128,7 @@
             touchTicker.detach();
             touchTimer.stop();
         }
+        _internal_ts_cal();
     }
     return noerror;
 }
@@ -176,8 +180,11 @@
         }
     }
     cls();
-    if (msg)
-        puts(msg);
+    if (msg) {                  // User defines the message
+        if (*msg) puts(msg);    // If any
+    } else {                    // Default message
+        puts("Touch '+' to calibrate the touch panel");
+    }
     SetTextCursor(0,height()/2);
     pTest[0].x = 50;
     pTest[0].y = 50;
@@ -189,8 +196,9 @@
     for (int i=0; i<3; i++) {
         foreground(Blue);
         printf(" (%3d,%3d) => ", pTest[i].x, pTest[i].y);
-        line(pTest[i].x-10, pTest[i].y, pTest[i].x+10, pTest[i].y, White);
-        line(pTest[i].x, pTest[i].y-10, pTest[i].x, pTest[i].y+10, White);
+        fillcircle(pTest[i].x,pTest[i].y, 20, White);
+        line(pTest[i].x-10, pTest[i].y, pTest[i].x+10, pTest[i].y, Blue);
+        line(pTest[i].x, pTest[i].y-10, pTest[i].x, pTest[i].y+10, Blue);
         while (!TouchPanelA2DFiltered(&x, &y) && timeout.read() < maxwait_s) {
             wait_ms(20);
             if (idle_callback) {
@@ -201,8 +209,9 @@
         }
         pSample[i].x = x;
         pSample[i].y = y;
-        line(pTest[i].x-10, pTest[i].y, pTest[i].x+10, pTest[i].y, Black);
-        line(pTest[i].x, pTest[i].y-10, pTest[i].x, pTest[i].y+10, Black);
+        fillcircle(pTest[i].x,pTest[i].y, 20, Black);   // Erase the target
+        //line(pTest[i].x-10, pTest[i].y, pTest[i].x+10, pTest[i].y, Black);
+        //line(pTest[i].x, pTest[i].y-10, pTest[i].x, pTest[i].y+10, Black);
         foreground(Blue);
         printf(" (%4d,%4d)\r\n", x,y);
         while (TouchPanelA2DFiltered(&x, &y) && timeout.read() < maxwait_s) {
@@ -363,6 +372,12 @@
     return noerror;
 }
 
+const tpMatrix_t * RA8875::TouchPanelGetMatrix()
+{
+    return &tpMatrix;
+}
+
+
 static void InsertionSort(int * buf, int bufsize)
 {
     int i, j;
@@ -696,6 +711,49 @@
     return( retValue ) ;
 }
 
+void RA8875::ResTouchPanelCfg(const char * _tpFQFN, const char * _tpCalMessage)
+{
+    tpFQFN = _tpFQFN;
+    tpCalMessage = _tpCalMessage;
+}
+
+
+RetCode_t RA8875::_internal_ts_cal()
+{
+    FILE * fh;
+    tpMatrix_t matrix;
+    RetCode_t r = noerror;
+    
+    if (tpFQFN) {
+        fh = fopen(tpFQFN, "rb");
+        if (fh) {
+            fread(&matrix, sizeof(tpMatrix_t), 1, fh);
+            fclose(fh);
+            TouchPanelSetMatrix(&matrix);
+        } else {
+            r = TouchPanelCalibrate(tpCalMessage, &matrix);
+            if (r == noerror) {
+                fh = fopen(tpFQFN, "wb");
+                if (fh) {
+                    fwrite(&matrix, sizeof(tpMatrix_t), 1, fh);
+                    fclose(fh);
+                    INFO("  tp cal written to '%s'.", tpFQFN);
+                } else {
+                    ERR("  couldn't open tpcal file '%s'.", tpFQFN);
+                    r = file_not_found;
+                }
+            } else {
+                ERR("error return: %d", r);
+            }
+            HexDump("TPCal", (const uint8_t *)&matrix, sizeof(tpMatrix_t));
+            cls();
+        }
+    }
+    return r;
+}
+
+
+
 ////////////////// Capacitive Touch Panel
 
 uint8_t RA8875::readRegister8(uint8_t reg) {