SSD1306 Only one line of text at a time?

[JonathanGlass]

With the SSD1306, is there a clean way of putting more than one line of text on the screen at a time?
I used two oled.drawstring functions and I offset the starting point of the second one to be under the first. When I ran it, it only displayed the first and it ignored the second.
With that being said, my end game is this:
What I am trying to do is to scroll through a list of mp3s from an SD card, selecting one, and then executing the mp3 from the SD card.
If someone has already written this, lemme know.

I can list the files on the serial display but I can only get one line of text on the SSD1306 at a time.
Can you guys point me in the right direction?

[JonathanGlass]

Nothing?

[adafruit_support_bill]

Looking at the library code, I don't see anything that would preclude a second line of text. Can you post the code you are using?

[deejayspinz]

I just did this the other night.. Using the 128x32 OLED LCD. Sample is below. In a nutshell, I have 3 lines of items being displayed with 2 items per line. The 2nd parameter in .drawstring is set to line 0, then I jump to 2 and 3. I figure it could do 4 lines of text but it would look tight. Sample image in my blog here. See the second image for how the below code renders.

Code: Select all

      oled.clear();

      //Distance to next red light
      oled.drawstring(0, 0, "Dist:");
      if (minDist == 100000)
      {
        oled.drawstring(30, 0, "?");
      }
        else
      {
        ftoa(cVal, minDist/1000, 2);
        oled.drawstring(30, 0, cVal);
      }
      oled.drawstring(55, 0, "km");


      //Cardinal Direction of vehicle
      //strcpy ( cVal, TinyGPS::cardinal(gps.f_course()) );
      strcpy ( cVal, gps.f_course() == TinyGPS::GPS_INVALID_F_ANGLE ? "?" : TinyGPS::cardinal(gps.f_course()));
      oled.drawstring(75, 0, "Dir:");
      oled.drawstring(100, 0, cVal);
     
      oled.drawline(0, 12, 128, 12, WHITE);

      //speed
      spd = gps.f_speed_kmph();
      if (spd < 0) {spd=0;}
      ftoa(cVal, spd, 0);
      oled.drawstring(0, 2, "Spd:");
      oled.drawstring(25, 2, cVal);


     
      //satellites
      itoa(gps.satellites(), cVal, 0);
      oled.drawstring(65, 2, "Sats:");
      oled.drawstring(90, 2, cVal);

     

      //latitude     
      ftoa(cVal, flat, 2);
      oled.drawstring(0, 3, "Lat:");
      oled.drawstring(25, 3, cVal);
      //longitude
      ftoa(cVal, flon, 2);
      oled.drawstring(65, 3, "Lng:");
      oled.drawstring(90, 3, cVal);


      //Display all the results
      oled.display();


[JonathanGlass]

Sweet! So basically I was using :

Code: Select all

oled.drawstring(0,0,"line one text");
oled.drawstring(0,8,"line two text");
delay(1000);
oled.clear();

So if I read this correctly I need a oled.display(); at the end to put it all together.
Something like this?

Code: Select all

oled.drawstring(0,0,"line one text");
oled.drawstring(0,8,"line two text");
oled.display();
delay(1000);
oled.clear();

I will this tonight. Thanks for the help.

[JonathanGlass]

Anyone have anywhere I can look for a head start on displaying the files and directory structure of the the sd card on the oled screen?
I am using an Teensy++ and SD Card Adaptor from PJRC and the SSD1306 I bought here. All of the pieces have been wiring correctly and work serparately using their various example sketches. I would like to scroll through the files on the SD card and select one file for execution.
I am pretty new to the scene. I have a vb.net programming background and it is taking me a minute to get up to speed on C but I am getting there.
I appreciate any help you guys can offer.

[deejayspinz]

Re your prev. post. I don't think you mentioned which oled you have, but using line # 8 may be off the screen. If it doesn't work try 1 or 2 first.

[JonathanGlass]

that is a LINE number...
I thought it was going off of pixels.
That speeds things up.
I got the screen working. Thanks to everyone for walking me through this.