Planning to order a new 20X2 (SMD)

[Andrew Cowan]

I'm using a (smd) 20X2 in a project which communicates with an serial LCD (with a crystal for timing), with another 20X2, and via a serial radio link.

However, the 20X2 requires calibfreq -5 to communicate with all these things (especially the screen), and even then there are errors.

I know a lot of people on this forum have mentioned the need for calibfreq with 20X2s - as I bought mine back when they were first released, I'm wondering if buying new ones would exhibit this problem less and need a smaller calibfreq?

Thanks,

Andrew

 

[inglewoodpete]

Andrew, All I can say is that I don't have any problems with comms from my 20X2's, bought about 4 months ago.

 

[Andrew Cowan]

Thanks for that Pete. I need some anyway, so I'll hope for the best.

Am I right in thinking that I2C is not so dependant on exact timing, as it has a clock line?

Thanks

Andrew

 

[Dippy]

Synchronous serial will always have that advantage over asynch. so I2C and SPI will always be happier assuming all things are operated within their speed limit.