Difference between revisions of "TileDriver"

From Hackstrich
Line 2: Line 2:
  
 
== Project Status ==
 
== Project Status ==
 +
* 2015-10-03: Build a breakout board for the tile connection to enable hooking a logic analyzer up to all the signals. Got SPI-to-tile working for a full display! Using the internal EBR in the CPLD right now, still need to fix up a lot of messy code and get the framebuffer into the external SDRAM, but it's getting there.
 +
* 2015-09-26: Got the first 3 bytes of RAM used to set the colour of the whole screen, which is a start.
 +
* 2015-09-19: Got the BCM working so each colour can now be set to any brightness via the DIP switches.
 +
* 2015-09-18: Got the basic hardware assembled on the MachXO dev board (connector for tile, 3x3 DIP switches to set colours for testing). Screen is successfully being driven with a single hardcoded colour over the whole display.
 
* 2015-09-16: Received 32x32 video tile and MachXO dev board to prototype this.
 
* 2015-09-16: Received 32x32 video tile and MachXO dev board to prototype this.
 
* 2015-09: Started putting idea together to use in the future BRCRD Scoreboard project.
 
* 2015-09: Started putting idea together to use in the future BRCRD Scoreboard project.

Revision as of 01:28, 4 October 2015

TileDriver is a board to drive HUB75 type RGB matrix panels from an SPI bus. It contains a framebuffer and interface circuitry to allow slower CPUs like an AVR or PIC to drive the displays.

Project Status

  • 2015-10-03: Build a breakout board for the tile connection to enable hooking a logic analyzer up to all the signals. Got SPI-to-tile working for a full display! Using the internal EBR in the CPLD right now, still need to fix up a lot of messy code and get the framebuffer into the external SDRAM, but it's getting there.
  • 2015-09-26: Got the first 3 bytes of RAM used to set the colour of the whole screen, which is a start.
  • 2015-09-19: Got the BCM working so each colour can now be set to any brightness via the DIP switches.
  • 2015-09-18: Got the basic hardware assembled on the MachXO dev board (connector for tile, 3x3 DIP switches to set colours for testing). Screen is successfully being driven with a single hardcoded colour over the whole display.
  • 2015-09-16: Received 32x32 video tile and MachXO dev board to prototype this.
  • 2015-09: Started putting idea together to use in the future BRCRD Scoreboard project.

Overview

  • 640x640x24bpp max display size
  • Main data input via SPI at up to 50MHz
    • 256x256x24bpp can update at 30fps
    • 640x640x24bpp can update at 5fps, still fine for static data displays