title: Writing a string to a framebuffer device?
body: <p>This is on a Raspberry Pi, Linux 3.13, bash 4.2</p>
  
  <p>Connected is a SPI 320x240 Display which is displaying a background image (I used <code>fbi</code> to display the image, the <code>cat /dev/fb1 &gt; framebuffer.contents</code>, then whenever I need the image I do <code>cat framebuffer.contents &gt; /dev/fb1</code> to save the looong startup time of <code>fbi</code>).</p>
  
  <p>Now I'd like to "amend" my image by a (changing) one-line text (a few word, the time, ...). Therefore I am looking for a way to write a string, from bash, to a specific location within the framebuffer. Eg. a tool is needed that <strong>a)</strong> converts a string given to some sort of framebuffer-redabe graphic (<code>ppm</code>?), then <strong>b)</strong> inserts that resulting image into a given part of the framebuffer.</p>
  
  <p>Any ideas? Or is my good old bash-and-unix-tools approach over it's head here and I need to look into .... ?</p>