[WIP] Jolla OtherHalf UART/232 Interface
 

Originated from other thread....


I have given some toughts to this already...

--> either SC16IS750. Has 3.3V operation, but you'll need I2C levelconverter (e.g. PCA9517) and 1.8V regulator. Easier to interface to the 232 transceiver.

http://talk.maemo.org/attachment.php...1&d=1389602581

--> or SC16IS850L. Has 1.8V operation, no need for I2C level converter, but needs 1.8V regulator. and some tricks to interface to 232 transceiver.

http://talk.maemo.org/attachment.php...1&d=1389602574

Re: Jolla OtherHalf UART/232 Interface
 

trying to see if i can get a ssmple, or two. as they have a distributor close by

Re: Jolla OtherHalf UART/232 Interface
 

Looks good! What about the software side - what kind of interface we would have to use with this SC16IS750 ? I mean do we have to write a library from scratch ?

Pardon my ignorance.. I'm not an HW expert and new to Jolla. What is TCVR ?

Re: Jolla OtherHalf UART/232 Interface
 

tranciever
the purpose - and interface is rs232/ infrared addition to communicate with serial devices or connect fx to retrieve logs from bootloader

Re: Jolla OtherHalf UART/232 Interface
 

I should have all parts for the -750 version.. and some code ready, as this was used in one project to interface 232 touchscreen via I2C.
Only thing missing is time to tinker it..

Re: Jolla OtherHalf UART/232 Interface
 

And, I just got a qoute that the connection close here is very interested in this, and wants to help where they can - So, all chips and technical assistance is 'almost' ready :)

Re: Jolla OtherHalf UART/232 Interface
 

Looking for the thinnest D9 -connector (Straight) solution... The WP 425 was thinnest after 30min go'ogling.

http://wppro.com/content/typo3temp/p...237bdb06db.gif


kinda-retro-look

Re: Jolla OtherHalf UART/232 Interface
 

update
V0.02 schematic. ready. then layout.
(The 232 transceiver changed to SP3203E -has separate logic supply for interfacing 1.8V and with more channels)

No leds, should be buffered as there is no outputs with enough drive-strength.
Signals available in connector

• TXD -->
• RXD <--
• DTR -->
• RTS -->
• CTS <--

Re: [WIP] Jolla OtherHalf UART/232 Interface
 

I have seen some discussions about IRDA transmitter/receiver things?
Or are they talking just IR transmitters like in remote controllers?
IRDA shold be doable with this uart.

Re: [WIP] Jolla OtherHalf UART/232 Interface
 

Thats what I plan, I believe irda is a thing missing, since N900 ;)