Sony Lanc source code

[thedemri]

Hi
I'm deep in the programming of the LANC protocol . And I wish I could have a CCS C source code as a reference (not ASM).

If anyone of you can halp in this topic please do.

Anyway, some questions about the protocol:

I am working with a scope and an external controller.
I also have a list of the LANC commands. I'm currently detecting the frame of each BYTE and know the timing of every BIT.

But I have run into three problems, I will be happy if you could help me with them:

1. The order of bits in every byte is a 0 first and last 7 or vice versa?
2. When I want to write a command to the camera, at what point of the bit timing am I supposed to modify the BIT logic state ? Mid-time or early the beginning of BIT? And for how long the BIT logic state must appear for the camera to recognize it as 1 or 0 ?
3. Is +5 volts is considered a 1 or 0?

thanks Amnon

[Guest]

A lot of info here..

http://elmelectronics.com/thehome.html#ELM624

I have used this chip in the past - what a timesaver!

I have also hacked into the buttons from a working LANC control dongle - that saves time too.


HTH - Steve H.