ladyada / adafruit_characteroled Goto Github PK

Hello,

I just got my OLED 16x2 module today, so I wanted to try it using the example given with the library.

This is the render of the "Hello World" exemple on my screen :

Any idea ?

The source code mentions it would handle warm starts. But in my case, most of the time it shows some "greek" alpha and x characters after a restart and nothing else happens.

Is there some way to fix that?

( I am using the spark core and the adafruit 16x2 oled display)

Just using the provided example sketch HelloOLEDWorld gives:

F:\Documents\Arduino\libraries\Adafruit_CharacterO LED-master\Adafruit_CharacterOLED.cpp:66:101: warning: default argument given for parameter 3 of 'void Adafruit_CharacterOLED::begin(uint8_t, uint8_t, uint8_t)' [-fpermissive]
void Adafruit_CharacterOLED::begin(uint8_t cols, uint8_t lines, uint8_t character_set = LCD_JAPANESE)
^
In file included from F:\Documents\Arduino\libraries\Adafruit_CharacterO LED-master\Adafruit_CharacterOLED.cpp:7:0:
F:\Documents\Arduino\libraries\Adafruit_CharacterO LED-master\Adafruit_CharacterOLED.h:58:8: note: previous specification in 'void Adafruit_CharacterOLED::begin(uint8_t, uint8_t, uint8_t)' here
void begin(uint8_t cols, uint8_t rows, uint8_t character_set = LCD_JAPANESE);
^
F:\Documents\Arduino\libraries\Adafruit_CharacterO LED-master\Adafruit_CharacterOLED.cpp: In member function 'virtual size_t Adafruit_CharacterOLED::write(uint8_t)':
F:\Documents\Arduino\libraries\Adafruit_CharacterO LED-master\Adafruit_CharacterOLED.cpp:244:1: warning: no return statement in function returning non-void [-Wreturn-type]
}
^

in the cpp file, changing void Adafruit_CharacterOLED::begin(uint8_t cols, uint8_t lines, uint8_t character_set = LCD_JAPANESE)
to
void Adafruit_CharacterOLED::begin(uint8_t cols, uint8_t lines, uint8_t character_set)
fixes the first warning (should I have to do this???) but the warning still remails:

F:\Documents\Arduino\libraries\Adafruit_CharacterOLED-master\Adafruit_CharacterOLED.cpp: In member function 'virtual size_t Adafruit_CharacterOLED::write(uint8_t)':
F:\Documents\Arduino\libraries\Adafruit_CharacterOLED-master\Adafruit_CharacterOLED.cpp:244:1: warning: no return statement in function returning non-void [-Wreturn-type]
}
^

Is this a bug or what should I do? Thanks

When i try to compile this lib using a compiler optimization flag other than Arduino default -Os. For example when using -Ofast
I get the following error, which is if I understand it correctly a problem with the library :
In function global constructors keyed to 65535_0_Device.cpp.o.6022':
:(.text.startup+0x7d4): undefined reference to `Adafruit_CharacterOLED::command(unsigned char)'

`

If you use lcd.cursor(); the screen goes black

The library seems to use the ENGLISH_JAPANESE character font table and I can't figure out how to change it to WESTERN EUROPEAN.

To demo this, do a
oled.print((char)0xfd);

The rendered char is the "divide sign" (ENGLISH_JAPANESE) instead of the "tall lowercase u" (WESTERN EUROPEAN).
See WS0010 docs pages 5 & 6, right-most column, 3rd to last row.

I tried monkeying with Adafruit_CharacterOLED::begin() but couldn't figure out which instruction sets the Font Table.
I thought it might be this at line 97:
write4bits(0x08);
where the 2 LSB are 00 (FT1:0 = ENGLISH_JAPANESE) and tried setting this to
write4bits(0x09);
where the 2 LSB are 01 (FT1:0 = WESTERN EUROPEAN)
but the display reboots to displaying garbage, so that doesn't seem to be it.

Hi
I've found problem and I can't use RX from MIDI.h library at all
TX works.

I tested and I found that this function causes problem of RX pins in all Serial0, 1, 2, 3

void Adafruit_CharacterOLED::waitForReady(void) 
{
  unsigned char busy = 1;
  pinMode(_busy_pin, INPUT);
  digitalWrite(_rs_pin, LOW);	
  digitalWrite(_rw_pin, HIGH);      
  do
  {
  	digitalWrite(_enable_pin, LOW);
  	digitalWrite(_enable_pin, HIGH);

  	delayMicroseconds(10);
  	busy = digitalRead(_busy_pin);
  	digitalWrite(_enable_pin, LOW);

  	pulseEnable();		// get remaining 4 bits, which are not used.
  }
  while(busy);
  
  pinMode(_busy_pin, OUTPUT);
  digitalWrite(_rw_pin, LOW);
}

and this is simple code to check the problem:

#include <MIDI.h>
#include <Adafruit_CharacterOLED.h>
Adafruit_CharacterOLED lcd(OLED_V2, 22, 24, 26, 28, 30, 32, 34);

MIDI_CREATE_DEFAULT_INSTANCE();
bool LED=false;


 void setup()
 {
     MIDI.begin(MIDI_CHANNEL_OMNI);  // Listen to all incoming messages
     MIDI.setHandleNoteOn(MyNoteOnFunction);
     MIDI.setHandleNoteOff(MyNoteOffFunction); 

pinMode(10,OUTPUT);
  
     
 }

 void loop()
 {
     
     // Read incoming messages
     MIDI.read();
     if (LED==true)
     {
      digitalWrite(10,HIGH);//turn on led
     }

}


void MyNoteOnFunction (byte channel, byte note, byte velocity)
{

LED=true;

}

void MyNoteOffFunction (byte channel, byte note, byte velocity)

{

}


}

Standard library LiquidCrystal works correctly and of course it doesn't have that function.