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9341 display tool
Moderators: adafruit_support_bill, adafruit

9341 display tool

by normlane on Wed Feb 19, 2014 1:30 am

This will dump the font to the screen along with a scale to help figure out character codes. Just between you and me I'd dump everything above 0x7f and cut the font memory use in half. This is a graphic display after all why do you need the funny characters? Everything below 0x20 looks expendable as well although it would be more work to reclaim that memory.

Code: Select all | TOGGLE FULL SIZE
#include <Adafruit_GFX.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_ILI9341.h>
#include <Adafruit_STMPE610.h>
#include <Streaming.h>

#define TFT_DC 9
#define TFT_CS 10

// Use hardware SPI (on Uno, #13, #12, #11) and the above for CS/DC
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

const int sz = 2;         // text size
const int charWd = 6*sz;  // actually 5X7 but it's padded a little
const int charHt = 8*sz;

const int hOffset = 4*(charWd);
const int vOffset = 2*(charHt);

void setup(void)
  for (int i = 0; i<0x10;i++){
    for (int j = 0;j<0x10;j++){
      if (j==0){
        tft << "0x" << _HEX(i) << "_";
      tft.setCursor(hOffset +(j*charWd),(i*charHt)+vOffset);
      char c = (i*0x10)+ j;
  for (int i = 0;i<0x10;i++){
    tft.setCursor(hOffset + i*(charWd), vOffset-charHt-2);
    tft << _HEX(i);
    tft.setCursor(hOffset + i*charWd, (0x10*charHt)+ vOffset+2);
    tft << _HEX(i);

void loop()

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Joined: Thu Apr 01, 2010 5:39 pm