Add libraries, picocalc notes.

libraries/TFT_eSPI/examples/320 x 240/TFT_Float_Test/TFT_Float_Test.ino

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+/*
+Tests the updated floating point plot function
+The datum is set to the centre of the 320 x 240 screen
+so numbers are printed the middle.
+
+The last test shows the datum point as a red dot.
+
+Normally strings are printed relative to the top left corner but this can be
+changed with the setTextDatum() function. The library has #defines for:
+
+TL_DATUM  0 //Top left
+TC_DATUM  1 //Top centre
+TR_DATUM  2 //Top right
+ML_DATUM  3 //Middle left
+MC_DATUM  4 //Middle centre
+MR_DATUM  5 //Middle right
+BL_DATUM  6 //Bottom left
+BC_DATUM  7 //Bottom centre
+BR_DATUM  8 //Bottom right
+
+ 
+ Needs fonts 2 and 6
+
+ Make sure all the display driver and pin connections are correct by
+ editing the User_Setup.h file in the TFT_eSPI library folder.
+
+ #########################################################################
+ ###### DON'T FORGET TO UPDATE THE User_Setup.h FILE IN THE LIBRARY ######
+ #########################################################################
+ */
+
+
+#include <TFT_eSPI.h> // Hardware-specific library
+#include <SPI.h>
+
+TFT_eSPI tft = TFT_eSPI();       // Invoke custom library
+
+unsigned long drawTime = 0;
+
+void setup(void) {
+  Serial.begin(115200);
+  tft.init();
+  tft.setRotation(1);
+
+}
+
+void loop() {
+
+  char tmp[12];
+  
+  tft.fillScreen(TFT_BLACK);
+  tft.setTextColor(TFT_WHITE, TFT_BLACK);
+  
+  // Datum is middle centre
+  tft.setTextDatum(MC_DATUM);
+
+  // Test floating point drawing function:
+  // drawFloat(value, precision, x, y, font);
+  
+  float test = 67.125;
+  tft.drawFloat(test, 4, 160, 120, 6);
+    tft.drawString(dtostrf(test,4,4,tmp), 100, 200, 6);
+
+  delay(1000);
+  tft.fillScreen(TFT_BLACK);
+  
+  test = -0.555555;
+  tft.drawFloat(test, 3, 160, 120, 6);
+    tft.drawString(dtostrf(test,2,2,tmp), 100, 200, 6);
+
+  delay(1000);
+  tft.fillScreen(TFT_BLACK);
+  
+  test = 0.123;
+  tft.drawFloat(test, 4, 160, 120, 6);
+
+  tft.drawString(dtostrf(test,4,4,tmp), 100, 200, 6);
+
+  delay(1000);
+  tft.fillScreen(TFT_BLACK);
+
+  // This does not work at the moment....
+  test = 9999999;
+  tft.drawFloat(test, 0, 160, 120, 6);
+  tft.drawString(dtostrf(test,4,4,tmp), 100, 200, 6);
+  delay(1000);
+
+  //Plot the datum for the last number
+  tft.fillCircle(160,120,5,TFT_RED);
+  tft.setTextDatum(MC_DATUM);
+  tft.setTextColor(TFT_BLACK);
+  tft.drawString("X", 160, 120, 2);
+ 
+  delay(4000);
+}
+
+
+
+
+
+
+
+