directory move

picocalc/libraries/TFT_eSPI/examples/480 x 320/Touch_Controller_Demo/Touch_Controller_Demo.ino

@@ -0,0 +1,76 @@
+#include "FS.h"
+#include <SPI.h>
+#include <TFT_eSPI.h>
+TFT_eSPI tft = TFT_eSPI();
+
+#define CALIBRATION_FILE "/calibrationData"
+
+void setup(void) {
+  uint16_t calibrationData[5];
+  uint8_t calDataOK = 0;
+
+  Serial.begin(115200);
+  Serial.println("starting");
+
+  tft.init();
+
+  tft.setRotation(3);
+  tft.fillScreen((0xFFFF));
+
+  tft.setCursor(20, 0, 2);
+  tft.setTextColor(TFT_BLACK, TFT_WHITE);  tft.setTextSize(1);
+  tft.println("calibration run");
+
+  // check file system
+  if (!SPIFFS.begin()) {
+    Serial.println("formating file system");
+
+    SPIFFS.format();
+    SPIFFS.begin();
+  }
+
+  // check if calibration file exists
+  if (SPIFFS.exists(CALIBRATION_FILE)) {
+    File f = SPIFFS.open(CALIBRATION_FILE, "r");
+    if (f) {
+      if (f.readBytes((char *)calibrationData, 14) == 14)
+        calDataOK = 1;
+      f.close();
+    }
+  }
+  if (calDataOK) {
+    // calibration data valid
+    tft.setTouch(calibrationData);
+  } else {
+    // data not valid. recalibrate
+    tft.calibrateTouch(calibrationData, TFT_WHITE, TFT_RED, 15);
+    // store data
+    File f = SPIFFS.open(CALIBRATION_FILE, "w");
+    if (f) {
+      f.write((const unsigned char *)calibrationData, 14);
+      f.close();
+    }
+  }
+
+  tft.fillScreen((0xFFFF));
+
+}
+
+void loop() {
+  uint16_t x, y;
+  static uint16_t color;
+
+  if (tft.getTouch(&x, &y)) {
+
+    tft.setCursor(5, 5, 2);
+    tft.printf("x: %i     ", x);
+    tft.setCursor(5, 20, 2);
+    tft.printf("y: %i    ", y);
+
+    tft.drawPixel(x, y, color);
+    color += 155;
+  }
+}
+
+
+