The demo program which can be downloaded from this page illustrates a minimal interface between a PIC 16F84 and the STV5730A on screen display chip. By calling only two routines the STV5730A is initialised and the entire character set is continuously written to the screen. The demo program is annotated with comments to explain its function which refer to the STV5730A data sheet . The STV5730A has two output modes.
Mixed mode is used to overlay text onto an existing video signal.
In its full page mode the STV5730A generates own video signal onto which its text output is overlaid. Please refer to the data sheet in conjunction with the demo code for full descriptions of the STV5730A's modes and how these are selected. The demo code available below will assemble for PAL mixed mode if unaltered. For more advanced OSD projects, or if you just want to get up and running quickly, we suggest using our OSD example routines . Risto is developing a wireless video system for a remote control model helicopter using the project board to provide a text overlay of instrumentation information.