KF5N Radio Experimentation Site
T41-3 SDT: Implementing a New Display Technology
The T41-3 Experimental Platform Transceiver changes the display technology from the RA8875 to an “EVE” (Embedded Video Engine) display controller. Parts 1 through 6 below discuss the motivation to change to this very different display technology.
T41-3 Part 1: An Early Prototype
Here is a video of the first highly experimental T41-3 prototype:
As explained before in Part 1, the original T41 architecture includes a display module which places a high computational burden on the Teensy 4.1 single-core CPU. There are three display items that change with respect to time during normal operation of the receiver:
T41-3 Part 3: EVE Display Module Distributors
I will start out with bad news! EVE4 display modules are more expensive than RA8875 modules.
T41-3 Part 4 A Few Notes on Displays and Radio Frequency Interference
A few random notes on RFI and displays. I found this interesting display on eBay:
T41-3 Part 5 EVE Display Toolchain: Going up the learning curve fast!
Bridgetek, the company which designs the BT817 display driver IC, publishes tools to help in the deployment of products based on their display driver chip technology:
T41-3 Part 6 Building a Better Software Defined Transceiver: Software Concerns
The T41 as originally designed by Al and Jack uses this library to support display functions: