New Project wp34s micro usb flash cable revisited

[Marcus von Cube]

(02-07-2015 11:16 AM)MarkHaysHarris777 Wrote:  Can anyone who has Harald's board installed tell me whether there is a crystal on the back side of the board? One thing I'm noticing about the boards that work with MySamba and ones that do not doesn't seem to have anything to do with the PL2303HX chip (they're all made by FTDI); it has to do with whether the board is crystal controlled. The board I have has a crystal mounted on the back-side. Harald's pcb 2 the same?

Harald's board doesn't have the crystal mounted. The crystal needs to go to pads on the calculator to work reliably. If you want the IR led you will have to add the crystal because the IR software requires accurate timing.

The flash process has nothing to do with the crystal. Since the boot loader is part of the Atmel chip it cannot rely on the crystal to be present but only on the less accurate RC oscillator. So even with the crystal present it is not used during flashing.