set actually SPI freq

Author: 0x1abin

src/M5Stack.cpp

@@ -31,7 +31,7 @@ void M5Stack::begin() {
     Lcd.setBrightness(50);
 
     // TF Card
-    SD.begin(TFCARD_CS_PIN);
+    SD.begin(TFCARD_CS_PIN, SPI, 27000000);
 
     // Set wakeup button
     setWakeupButton(BUTTON_A_PIN);

src/utility/Display.h

@@ -45,8 +45,8 @@
 // #define SPI_FREQUENCY   5000000
 // #define SPI_FREQUENCY  10000000
 // #define SPI_FREQUENCY  20000000
-// #define SPI_FREQUENCY  27000000 // Actually sets it to 26.67MHz = 80/3
-#define SPI_FREQUENCY 40000000 // Maximum to use SPIFFS
+#define SPI_FREQUENCY  27000000 // Actually sets it to 26.67MHz = 80/3
+// #define SPI_FREQUENCY  40000000 // Maximum to use SPIFFS
 // #define SPI_FREQUENCY  80000000
 
 // Comment out the following #define if "SPI Transactions" do not need to be