为什么espidf的spi就是很慢

code/demo2/src/main.cpp

@@ -0,0 +1,18 @@
+#include <Arduino.h>
+#include "lcd.h"
+// put function declarations here:
+int myFunction(int, int);
+
+void setup()
+{
+  // put your setup code here, to run once:
+  lcd_init();
+
+  LCD_Clear(rand());
+}
+
+void loop()
+{
+  // put your main code here, to run repeatedly:
+  LCD_Clear(rand());
+}