Function to test all LEDs at once?

[seanspotatobusiness]

Hi. Is there a function to illuminate all LEDs in the display at once (i.e. all decimal places and the colon and set all digits to 8)? Thanks.

[RobTillaart]

No no such function exists. What is the rationale for this functionality?

it should be something like this

void testAll()
{
  for (uint8_t i = 0; i < 5; i++) writePos(i, 255);
};

or far more fancy something like

void testAll()
{
  // for (uint8_t i = 0; i < 5; i++) writePos(i, 255);
  for (uint8_t i = 0; i < 5; i++)
  {
    for (int j = 0; j < 256; j <<= 1, j |= 1) 
    {
      writePos(i, (uint8_t)j);
      delay(100);
    }
  }
};

you can copy the above in th .h file of the lib to give it a try.

maybe 2 functions just on() and off()

[RobTillaart]

in a sense displayTest() does test all leds but also all possible combinations.

If there is a short circuit somewhere it should become visible with this call as all digits should be same in every step.

void HT16K33::displayTest(uint8_t del)
{
  for (int i = 0; i < 256; i++)
  {
    writePos(0, i);
    writePos(1, i);
    writePos(2, i);
    writePos(3, i);
    writePos(4, i);
    delay(del);
  }
}

set del to 0 for fast test (< 1 second)

[seanspotatobusiness]

Thanks for your help but I'm afraid I don't know how to implement your advice. I'm using version 0.24 of your library (the latest installed via the Library Manager in the Arduino IDE (1.8.13)).

I copied this into HT16K33.h, just above // -- END OF FILE --

void testAll() { for (uint8_t i = 0; i < 5; i++) writePos(i, 255); };

I then replaced "test_printfloat();" with "testAll();" in test_printfloat.ino but when I try to compile I get errors revolving around writePos:

E:\Projects\Electronics\Arduino sketches\libraries\HT16K33/HT16K33.h:77:35: error: 'writePos' was not declared in this scope
   for (uint8_t i = 0; i < 5; i++) writePos(i, 255);

                                   ^~~~~~~~

E:\Projects\Electronics\Arduino sketches\libraries\HT16K33/HT16K33.h:77:35: note: suggested alternative: 'fwrite'
   for (uint8_t i = 0; i < 5; i++) writePos(i, 255);

                                   ^~~~~~~~

                                   fwrite

exit status 1

Error compiling for board Arduino Nano.

Do you know how to resolve this? Thanks again for your help.

[RobTillaart]

What platform do you use?

[RobTillaart]

I copied this into HT16K33.h, just above // -- END OF FILE --

That is outside the class definition, you should include it just above the word private: (line 62 or so)

[RobTillaart]

For the upcoming 0.3.0 version I extended the interface of displayRaw(uint *ar, bool colon = false) so you can also switch on/off the colon to allow you to switch on all leds in 2 lines - here wrapped in a function:

void testAll()
{
  uint8_t x[4] = { 255, 255, 255, 255 };
  seg.displayRaw(x, true); 
}

I choose for this solution as it is more flexible than the first proposed testAll()

[RobTillaart]

extended displayRaw() included, 0.3.0 released