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