Added Lcd darw QRCode method

Author: 0x1abin

examples/Advanced/QRCode/QRCode.ino

@@ -0,0 +1,12 @@
+#include <M5Stack.h>
+
+void setup() {
+  M5.begin();
+
+  // Display QRCode
+  M5.Lcd.qrcode("http://www.m5stack.com");
+  // M5.Lcd.qrcode(const char *string, uint16_t x = 50, uint16_t y = 10, uint8_t width = 220, uint8_t version = 6);
+}
+
+void loop() {
+}

src/utility/Display.cpp

@@ -2944,6 +2944,37 @@ void ILI9341::drawJpgFile(fs::FS &fs, const char *path, uint16_t x, uint16_t y,
   file.close();
 }
 
+
+#include "qrcode.h"
+void ILI9341::qrcode(const char *string, uint16_t x, uint16_t y, uint8_t width, uint8_t version) {
+  
+  // Create the QR code
+  QRCode qrcode;
+  uint8_t qrcodeData[qrcode_getBufferSize(version)];
+  qrcode_initText(&qrcode, qrcodeData, version, 0, string);
+  
+  // Top quiet zone
+  uint8_t thickness = width / qrcode.size;
+  uint16_t lineLength = qrcode.size * thickness;
+  uint8_t xOffset = x + (width-lineLength)/2;
+  uint8_t yOffset = y + (width-lineLength)/2;
+  fillRect(x, y, width, width, TFT_WHITE);
+
+  for (uint8_t y = 0; y < qrcode.size; y++) {
+    for (uint8_t x = 0; x < qrcode.size; x++) {
+      uint8_t q = qrcode_getModule(&qrcode, x, y);
+      if (q) fillRect(x * thickness + xOffset, y * thickness + yOffset, thickness, thickness, TFT_BLACK);
+    }
+  }
+}
+
+void ILI9341::qrcode(const String &string, uint16_t x, uint16_t y, uint8_t width, uint8_t version) {
+  int16_t len = string.length() + 2;
+  char buffer[len];
+  string.toCharArray(buffer, len);
+  qrcode(buffer, x, y, width, version);
+}
+
 /**************************************************************************
 **
 ** GBK character support

src/utility/Display.h

@@ -574,7 +574,9 @@ class ILI9341 : public Print
            writePixels(uint16_t *colors, uint32_t len),
            drawJpg(const uint8_t *jpg_data, size_t jpg_len, uint16_t x = 0, uint16_t y = 0, uint16_t maxWidth = 0, uint16_t maxHeight = 0, uint16_t offX = 0, uint16_t offY = 0, jpeg_div_t scale = JPEG_DIV_NONE),
            drawJpgFile(fs::FS &fs, const char *path, uint16_t x = 0, uint16_t y = 0, uint16_t maxWidth = 0, uint16_t maxHeight = 0, uint16_t offX = 0, uint16_t offY = 0, jpeg_div_t scale = JPEG_DIV_NONE),
-           drawBmpFile(fs::FS &fs, const char *path, uint16_t x = 0, uint16_t y = 0, uint16_t maxWidth = 0, uint16_t maxHeight = 0, uint16_t offX = 0, uint16_t offY = 0);
+           drawBmpFile(fs::FS &fs, const char *path, uint16_t x = 0, uint16_t y = 0, uint16_t maxWidth = 0, uint16_t maxHeight = 0, uint16_t offX = 0, uint16_t offY = 0),
+           qrcode(const char *string, uint16_t x = 50, uint16_t y = 10, uint8_t width = 220, uint8_t version = 6),
+           qrcode(const String &string, uint16_t x = 50, uint16_t y = 10, uint8_t width = 220, uint8_t version = 6);
 
 
   virtual size_t write(uint8_t);