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kimmoli's Avatar
Posts: 559 | Thanked: 2,701 times | Joined on Dec 2013 @ Espoo, Finland
#1
Originated from other thread....

Originally Posted by phenoboy
I'd like to add serial port (UART RX/TX pins at least) capability to Jolla with I2C.

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.



--> 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.


Last edited by kimmoli; 2015-02-21 at 13:33. Reason: back to WIP
 

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#2
trying to see if i can get a ssmple, or two. as they have a distributor close by
 
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#3
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 ?
 
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#4
Originally Posted by phenoboy View Post
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 ?
tranciever
the purpose - and interface is rs232/ infrared addition to communicate with serial devices or connect fx to retrieve logs from bootloader
 
kimmoli's Avatar
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#5
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..
 
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#6
Originally Posted by kimmoli View Post
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..
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
 

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kimmoli's Avatar
Posts: 559 | Thanked: 2,701 times | Joined on Dec 2013 @ Espoo, Finland
#7
Looking for the thinnest D9 -connector (Straight) solution... The WP 425 was thinnest after 30min go'ogling.




kinda-retro-look
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kimmoli's Avatar
Posts: 559 | Thanked: 2,701 times | Joined on Dec 2013 @ Espoo, Finland
#8
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 <--
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Last edited by kimmoli; 2014-01-21 at 19:28.
 
kimmoli's Avatar
Posts: 559 | Thanked: 2,701 times | Joined on Dec 2013 @ Espoo, Finland
#9
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.
 
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#10
Thats what I plan, I believe irda is a thing missing, since N900
 
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