Closed kiteretro closed 8 years ago
Sorry, late reply. The schematics are not really useful because there are issues with analog portion. I wouldn't want you to clone something that's not really a great schema.
Maybe at some point I'll have time to revisit this project.
Thanks for the reply, I think this project has legs as an open source STM OSD (to replace the MAX7456 based OSDs) would be massively welcome! I originally asked as I am looking at doing something similar and experimenting around with ideas.. I hope you do pick it up at some point, the TauLabs project uses dual SPI and DMA to provide a good OSD so there is code out there, but very little schematics ;) Thanks again, I'll close this issue.
Yeah, I totally agree. The MAX shit needs to die. there are schematics for tau stuff, I thought their requirement was being opensores?
The simplest way is just a analog switch that gets toggled between Vin and one of several voltages (representing NTSC white, NTSC black).
This is the switch that gets toggled by DMA'd SPI channels.
On Mon, Apr 4, 2016 at 9:11 PM, geebles notifications@github.com wrote:
Thanks for the reply, I think this project has legs as an open source STM OSD (to replace the MAX7456 based OSDs) would be massively welcome! I originally asked as I am looking at doing something similar and experimenting around with ideas.. I hope you do pick it up at some point, the TauLabs project uses dual SPI and DMA to provide a good OSD so there is code out there, but very little schematics ;) Thanks again, I'll close this issue.
— You are receiving this because you commented. Reply to this email directly or view it on GitHub https://github.com/trollcop/m4osd/issues/1#issuecomment-205269891
Totally, MAX + 328p isn't great..
You are correct I believe, they use the F4's DAC to provide the voltage as far as I can tell.. I didn't spend long digging so perhaps I'll revisit and search there for the schematics and start prototyping something.. Thanks for your help, all the best!
I've considered using dac, but unless you want changeable brightness levels (usually you don't), just using resistor dividers to get NTSC voltages is enough.
On Mon, Apr 4, 2016 at 10:53 PM, geebles notifications@github.com wrote:
Totally, MAX + 328p isn't great..
You are correct I believe, they use the F4's DAC to provide the voltage as far as I can tell.. I didn't spend long digging so perhaps I'll revisit and search there for the schematics and start prototyping something.. Thanks for your help, all the best!
— You are receiving this because you commented. Reply to this email directly or view it on GitHub https://github.com/trollcop/m4osd/issues/1#issuecomment-205303962
Hi, could you make any schematics available? I have a rough idea based on the board.h how it goes together but would be better if I had some basic schematic :) If you would like to PM me (instead of making public) then gilesburgess2[at]hotmail.com will work!