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In this article we look at the Lolin 32 to a 2.4“ inch 320×240 TFT LCD Touch Screen shield.
This is the shield which we connect via a TFT connector from the shield to the Lolin D32
Features
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2.4” diagonal LCD TFT display
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320×240 pixels
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TFT Driver IC: ILI9341
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Touch Screen controller IC: XPT2046
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Compatible with D1 mini, D1 mini Pro, D32 Pro.
Code
Install these libraries – Adafruit_GFX, Adafruit_ILI9341 and XPT2046_Touchscreen Library
A couple of really good examples here
Touch example
[cpp]
#include <SPI.h> #include <Adafruit_GFX.h> #include <Adafruit_ILI9341.h> #include <XPT2046_Touchscreen.h> //#define TFT_CS D0 //for D1 mini or TFT I2C Connector Shield (V1.1.0 or later) //#define TFT_DC D8 //for D1 mini or TFT I2C Connector Shield (V1.1.0 or later) //#define TFT_RST -1 //for D1 mini or TFT I2C Connector Shield (V1.1.0 or later) //#define TS_CS D3 //for D1 mini or TFT I2C Connector Shield (V1.1.0 or later) #define TFT_CS 14 //for D32 Pro #define TFT_DC 27 //for D32 Pro #define TFT_RST 33 //for D32 Pro #define TS_CS 12 //for D32 Pro Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST); XPT2046_Touchscreen ts(TS_CS); void setup() { Serial.begin(115200); ts.begin(); ts.setRotation(1); tft.begin(); tft.setRotation(3); tft.fillScreen(ILI9341_BLACK); tft.setTextColor(ILI9341_WHITE); tft.setTextSize(3); tft.println("Touch Test"); while (!Serial && (millis() <= 1000)) ; } void loop() { if (ts.touched()) { TS_Point p = ts.getPoint(); tft.fillScreen(ILI9341_BLACK); tft.setCursor(0, 0); tft.print("Pressure = "); tft.println(p.z); tft.print("X = "); tft.println(p.x); tft.print("Y = "); tft.println(p.y); } }
[/cpp]
Graphics example
[cpp]
#include <SPI.h> #include <Adafruit_GFX.h> #include <Adafruit_ILI9341.h> //#define TFT_CS D0 //for D1 mini or TFT I2C Connector Shield (V1.1.0 or later) //#define TFT_DC D8 //for D1 mini or TFT I2C Connector Shield (V1.1.0 or later) //#define TFT_RST -1 //for D1 mini or TFT I2C Connector Shield (V1.1.0 or later) //#define TS_CS D3 //for D1 mini or TFT I2C Connector Shield (V1.1.0 or later) #define TFT_CS 14 //for D32 Pro #define TFT_DC 27 //for D32 Pro #define TFT_RST 33 //for D32 Pro #define TS_CS 12 //for D32 Pro Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST); void setup() { Serial.begin(115200); Serial.println("ILI9341 Test!"); tft.begin(); // read diagnostics (optional but can help debug problems) uint8_t x = tft.readcommand8(ILI9341_RDMODE); Serial.print("Display Power Mode: 0x"); Serial.println(x, HEX); x = tft.readcommand8(ILI9341_RDMADCTL); Serial.print("MADCTL Mode: 0x"); Serial.println(x, HEX); x = tft.readcommand8(ILI9341_RDPIXFMT); Serial.print("Pixel Format: 0x"); Serial.println(x, HEX); x = tft.readcommand8(ILI9341_RDIMGFMT); Serial.print("Image Format: 0x"); Serial.println(x, HEX); x = tft.readcommand8(ILI9341_RDSELFDIAG); Serial.print("Self Diagnostic: 0x"); Serial.println(x, HEX); Serial.println(F("Benchmark Time (microseconds)")); delay(10); Serial.print(F("Screen fill ")); Serial.println(testFillScreen()); delay(500); Serial.println(F("Done!")); } void loop(void) { for (uint8_t rotation = 0; rotation < 4; rotation++) { tft.setRotation(rotation); testText(); delay(1000); } } unsigned long testFillScreen() { unsigned long start = micros(); tft.fillScreen(ILI9341_BLACK); yield(); tft.fillScreen(ILI9341_RED); yield(); tft.fillScreen(ILI9341_GREEN); yield(); tft.fillScreen(ILI9341_BLUE); yield(); tft.fillScreen(ILI9341_BLACK); yield(); return micros() - start; } unsigned long testText() { tft.fillScreen(ILI9341_BLACK); unsigned long start = micros(); tft.setCursor(0, 0); tft.setTextColor(ILI9341_WHITE); tft.setTextSize(1); tft.println("Hello World!"); tft.setTextColor(ILI9341_YELLOW); tft.setTextSize(2); tft.println(1234.56); tft.setTextColor(ILI9341_RED); tft.setTextSize(3); tft.println(0xDEADBEEF, HEX); tft.println(); tft.setTextColor(ILI9341_GREEN); tft.setTextSize(5); tft.println("Groop"); tft.setTextSize(2); tft.println("I implore thee,"); tft.setTextSize(1); tft.println("my foonting turlingdromes."); tft.println("And hooptiously drangle me"); tft.println("with crinkly bindlewurdles,"); tft.println("Or I will rend thee"); tft.println("in the gobberwarts"); tft.println("with my blurglecruncheon,"); tft.println("see if I don't!"); return micros() - start; } unsigned long testLines(uint16_t color) { unsigned long start, t; int x1, y1, x2, y2, w = tft.width(), h = tft.height(); tft.fillScreen(ILI9341_BLACK); yield(); x1 = y1 = 0; y2 = h - 1; start = micros(); for (x2 = 0; x2 < w; x2 += 6) tft.drawLine(x1, y1, x2, y2, color); x2 = w - 1; for (y2 = 0; y2 < h; y2 += 6) tft.drawLine(x1, y1, x2, y2, color); t = micros() - start; // fillScreen doesn't count against timing yield(); tft.fillScreen(ILI9341_BLACK); yield(); x1 = w - 1; y1 = 0; y2 = h - 1; start = micros(); for (x2 = 0; x2 < w; x2 += 6) tft.drawLine(x1, y1, x2, y2, color); x2 = 0; for (y2 = 0; y2 < h; y2 += 6) tft.drawLine(x1, y1, x2, y2, color); t += micros() - start; yield(); tft.fillScreen(ILI9341_BLACK); yield(); x1 = 0; y1 = h - 1; y2 = 0; start = micros(); for (x2 = 0; x2 < w; x2 += 6) tft.drawLine(x1, y1, x2, y2, color); x2 = w - 1; for (y2 = 0; y2 < h; y2 += 6) tft.drawLine(x1, y1, x2, y2, color); t += micros() - start; yield(); tft.fillScreen(ILI9341_BLACK); yield(); x1 = w - 1; y1 = h - 1; y2 = 0; start = micros(); for (x2 = 0; x2 < w; x2 += 6) tft.drawLine(x1, y1, x2, y2, color); x2 = 0; for (y2 = 0; y2 < h; y2 += 6) tft.drawLine(x1, y1, x2, y2, color); yield(); return micros() - start; } unsigned long testFastLines(uint16_t color1, uint16_t color2) { unsigned long start; int x, y, w = tft.width(), h = tft.height(); tft.fillScreen(ILI9341_BLACK); start = micros(); for (y = 0; y < h; y += 5) tft.drawFastHLine(0, y, w, color1); for (x = 0; x < w; x += 5) tft.drawFastVLine(x, 0, h, color2); return micros() - start; } unsigned long testRects(uint16_t color) { unsigned long start; int n, i, i2, cx = tft.width() / 2, cy = tft.height() / 2; tft.fillScreen(ILI9341_BLACK); n = min(tft.width(), tft.height()); start = micros(); for (i = 2; i < n; i += 6) { i2 = i / 2; tft.drawRect(cx - i2, cy - i2, i, i, color); } return micros() - start; } unsigned long testFilledRects(uint16_t color1, uint16_t color2) { unsigned long start, t = 0; int n, i, i2, cx = tft.width() / 2 - 1, cy = tft.height() / 2 - 1; tft.fillScreen(ILI9341_BLACK); n = min(tft.width(), tft.height()); for (i = n; i > 0; i -= 6) { i2 = i / 2; start = micros(); tft.fillRect(cx - i2, cy - i2, i, i, color1); t += micros() - start; // Outlines are not included in timing results tft.drawRect(cx - i2, cy - i2, i, i, color2); yield(); } return t; } unsigned long testFilledCircles(uint8_t radius, uint16_t color) { unsigned long start; int x, y, w = tft.width(), h = tft.height(), r2 = radius * 2; tft.fillScreen(ILI9341_BLACK); start = micros(); for (x = radius; x < w; x += r2) { for (y = radius; y < h; y += r2) { tft.fillCircle(x, y, radius, color); } } return micros() - start; } unsigned long testCircles(uint8_t radius, uint16_t color) { unsigned long start; int x, y, r2 = radius * 2, w = tft.width() + radius, h = tft.height() + radius; // Screen is not cleared for this one -- this is // intentional and does not affect the reported time. start = micros(); for (x = 0; x < w; x += r2) { for (y = 0; y < h; y += r2) { tft.drawCircle(x, y, radius, color); } } return micros() - start; } unsigned long testTriangles() { unsigned long start; int n, i, cx = tft.width() / 2 - 1, cy = tft.height() / 2 - 1; tft.fillScreen(ILI9341_BLACK); n = min(cx, cy); start = micros(); for (i = 0; i < n; i += 5) { tft.drawTriangle( cx, cy - i, // peak cx - i, cy + i, // bottom left cx + i, cy + i, // bottom right tft.color565(i, i, i)); } return micros() - start; } unsigned long testFilledTriangles() { unsigned long start, t = 0; int i, cx = tft.width() / 2 - 1, cy = tft.height() / 2 - 1; tft.fillScreen(ILI9341_BLACK); start = micros(); for (i = min(cx, cy); i > 10; i -= 5) { start = micros(); tft.fillTriangle(cx, cy - i, cx - i, cy + i, cx + i, cy + i, tft.color565(0, i * 10, i * 10)); t += micros() - start; tft.drawTriangle(cx, cy - i, cx - i, cy + i, cx + i, cy + i, tft.color565(i * 10, i * 10, 0)); yield(); } return t; } unsigned long testRoundRects() { unsigned long start; int w, i, i2, cx = tft.width() / 2 - 1, cy = tft.height() / 2 - 1; tft.fillScreen(ILI9341_BLACK); w = min(tft.width(), tft.height()); start = micros(); for (i = 0; i < w; i += 6) { i2 = i / 2; tft.drawRoundRect(cx - i2, cy - i2, i, i, i / 8, tft.color565(i, 0, 0)); } return micros() - start; } unsigned long testFilledRoundRects() { unsigned long start; int i, i2, cx = tft.width() / 2 - 1, cy = tft.height() / 2 - 1; tft.fillScreen(ILI9341_BLACK); start = micros(); for (i = min(tft.width(), tft.height()); i > 20; i -= 6) { i2 = i / 2; tft.fillRoundRect(cx - i2, cy - i2, i, i, i / 8, tft.color565(0, i, 0)); yield(); } return micros() - start; }
[/cpp]
Video
A video showing these examples