TFT_eSprite drawString is crash

[nnn112358]

Kernel panic occurs when the size of drawString is set to 1 in TFT_eSprite.

moji2 = "Test";
TFT_eSprite * Spr->drawString(moji2, 80, 0, 1);

Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled.

There is no problem if the character size is 2 or more.

moji2 = "Test";
TFT_eSprite * Spr->drawString(moji2, 80, 0, 2);

I use ・arduino-esp ver 1.04 ・m5stickc libs in adrduino ver 0.1.1

[EeeeBin]

Hi. Try follow: https://github.com/m5stack/M5Stack/tree/master/examples/Advanced/Display/Sprite

[nnn112358]

This example is no problem by the character size is between 2 and 8 .

EX.
    stext2.drawString("Hello World", 6, 0, 2); // draw at 6,0 in sprite, font 2 size

If folloow modification is bad.

    stext2.drawString("Hello World", 6, 0, 1); // draw at 6,0 in sprite, font 1 size
    stext2.drawString("Hello World", 6, 0, 10); // draw at 6,0 in sprite, font 10 size

[nnn112358]

I investigated.

*int16_t TFT_eSPI::drawString(const char string, int32_t poX, int32_t poY, uint8_t font)

When specifying the "uint8_t font" value, there is no problem between 2 and 8. "uint8_t font" value is 1 or over 9will crash.

My Trouble Source Code

  //This is crash
  //Spr->drawString(moji, 0, 0, 1);

  //This is No problem
  Spr->drawString(moji, 0, 20, 2);
  Spr->drawString(moji, 0, 40, 3);
  Spr->drawString(moji, 0, 60, 4);
  
  //This is crash
  //Spr->drawString(moji, 0, 60, 10);

https://gist.github.com/anoken/8ef9355e6945080b37fed12d6edb1e94

Crash Point drawString() goes into textWidth() processing

TFT_eSPI::textWidth(const char *string, uint8_t font) https://github.com/m5stack/M5StickC/blob/master/src/utility/In_eSPI.cpp#L2354

If "uint8_t font" value between 2 and 8 is follow process. This is No problem. int16_t TFT_eSPI::textWidth(const char *string, uint8_t font) https://github.com/m5stack/M5StickC/blob/master/src/utility/In_eSPI.cpp#L2387

But, If "uint8_t font" value1 or 9 is follow process. This is crash point. gfxFont is invaid value, so crashed when accessed. https://github.com/m5stack/M5StickC/blob/master/src/utility/In_eSPI.cpp#L2409

And, M5Stack is No problem. the same code within M5StickC is crash.

[ciniml]

Hi,

I found that the root cause of this issue is just initialization code of TFT_eSPI::gfxFont is missing in its constructor.

Adding gfxFont = NULL; before the line 269 of In_eSPI.cpp is enough to solve this issue.

[mancini0]

@ciniml your workaround worked for me - thanks!