Add SD card to demonstrate how to use the second SPI device

TTGO-T-Display.ino

@@ -34,6 +34,47 @@ char buff[512];
 int vref = 1100;
 int btnCick = false;
 
+#define ENABLE_SPI_SDCARD
+
+//Uncomment will use SDCard, this is just a demonstration,
+//how to use the second SPI
+#ifdef ENABLE_SPI_SDCARD
+
+#include "FS.h"
+#include "SD.h"
+#include <SPI.h>
+
+SPIClass SPI1(HSPI);
+
+#define MY_CS       33
+#define MY_SCLK     25
+#define MY_MISO     27
+#define MY_MOSI     26
+
+void setupSDCard()
+{
+    SPI1.begin(MY_SCLK, MY_MISO, MY_MOSI, MY_CS);
+    //Assuming use of SPI SD card
+    if (!SD.begin(MY_CS, SPI1)) {
+        Serial.println("Card Mount Failed");
+        tft.setTextColor(TFT_RED);
+        tft.drawString("SDCard Mount FAIL", tft.width() / 2, tft.height() / 2 - 32);
+        tft.setTextColor(TFT_GREEN);
+    } else {
+        tft.setTextColor(TFT_GREEN);
+        Serial.println("SDCard Mount PASS");
+        tft.drawString("SDCard Mount PASS", tft.width() / 2, tft.height() / 2 - 48);
+        String size = String((uint32_t)(SD.cardSize() / 1024 / 1024)) + "MB";
+        tft.drawString(size, tft.width() / 2, tft.height() / 2 - 32);
+    }
+}
+#else
+#define setupSDCard()
+#endif
+
+
+void wifi_scan();
+
 //! Long time delay, it is recommended to use shallow sleep, which can effectively reduce the current consumption
 void espDelay(int ms)
 {
@@ -160,6 +201,7 @@ void setup()
     tft.pushImage(0, 0,  240, 135, ttgo);
     espDelay(5000);
 
+
     tft.setRotation(0);
     tft.fillScreen(TFT_RED);
     espDelay(1000);
@@ -182,8 +224,13 @@ void setup()
         Serial.println("Default Vref: 1100mV");
     }
 
+
     tft.fillScreen(TFT_BLACK);
     tft.setTextDatum(MC_DATUM);
+
+    setupSDCard();
+
+
     tft.drawString("LeftButton:", tft.width() / 2, tft.height() / 2 - 16);
     tft.drawString("[WiFi Scan]", tft.width() / 2, tft.height() / 2 );
     tft.drawString("RightButton:", tft.width() / 2, tft.height() / 2 + 16);