Real Time Clock and RS232 buffer

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Farren
Posts: 10
Joined: Tue Sep 15, 2015 11:07 am

Real Time Clock and RS232 buffer

Post by Farren » Mon Jan 18, 2016 2:02 pm

Hi All,

I connected my RedPitaya UART RX and TX ( TTL ) lines to an external processor ( STM32 ) for communications between the 2 boards. For some reason I have not yet been able to work out why, the RP board got damaged , the RX and TX lines stopped working even through the connections were both 3V3. The RP still works but gets very hot, Unfortunately I had to throw that RP away, I got a couple of new RP units.
I decided to make a buffer board for the TX and RX on the RP to protect the signals, I also added some protection for the I/O lines and RS232 for the USART.
My application requires accurate Date and Time so I added an ISL 12022 RTC chip.
The RP communicate with the RTC via i2c interface. ( Note: My application works off line so I cannot use NTP server for time. )
I wrote some code to set/get the Date and Time from the RTC.
The same program can set the LINUX system date and time.
The board seems to work very well and RTC is accurate. Since using the board I have not damaged my new RedPitaya.

See attached picture of the board.
Any comments ??

Cheers
Farren
RP_A1.jpg

Nils Roos
Posts: 1441
Joined: Sat Jun 07, 2014 12:49 pm
Location: Königswinter

Re: Real Time Clock and RS232 buffer

Post by Nils Roos » Mon Jan 18, 2016 10:27 pm

Sounds interesting, but unfortunately attachments are broken in this forum :(

Farren
Posts: 10
Joined: Tue Sep 15, 2015 11:07 am

Re: Real Time Clock and RS232 buffer

Post by Farren » Wed Jan 20, 2016 10:57 am

Hi Nils,
I put a picture of the board on the Red Pitaya Facebook.
https://www.facebook.com/photo.php?fbid ... 711&type=3

Look forward to be able to post pics on this forum.

Cheers
Farren

Nils Roos
Posts: 1441
Joined: Sat Jun 07, 2014 12:49 pm
Location: Königswinter

Re: Real Time Clock and RS232 buffer

Post by Nils Roos » Thu Jan 21, 2016 10:35 pm

Wow, you even sprung for a red board^^

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redpitaya
Site Admin
Posts: 387
Joined: Wed Mar 26, 2014 7:04 pm

Re: Real Time Clock and RS232 buffer

Post by redpitaya » Fri Jan 22, 2016 10:35 am

Hi,

Great.
Thanks for sharing your project.

All Best, RP

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