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SC16IS752 problem

 
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championx



Joined: 28 Feb 2006
Posts: 151

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SC16IS752 problem
PostPosted: Mon Mar 09, 2015 2:51 pm     Reply with quote

Hi! I'm currently testing a board that has a SC16IS752 connected to a PIC24EP512GU810.

The thing is that I'm trying to use the library for the SC16IS752 posted on this forum but i cant make it work.

I tested the I2C connection to the IC successfully, but i cant make the SC16IS752 output a byte on the TXA or TXB pin.

I use the CCS compiler version 5.042, and here is the portion of the code that uses the i2c port:

Code:
#use I2C(master, sda=PIN_D4, scl=PIN_D5, stream = uart_i2c, SLOW)


Then i init the IC.

Code:
Init_SC16IS752();


then i try to output the "X" char over both ports

Code:
 while(1)
   {   
   delay_ms(200);
   UART_Send_Char(0,'X');
   UART_Send_Char(1,'X');
   output_toggle(PIN_F13);
   fprintf(U2,"TEST...\n\r");
   }


Someone have a suggestion?

thanks!
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Mon Mar 09, 2015 3:15 pm     Reply with quote

Run this program and see if it detects the i2c chip:
http://www.ccsinfo.com/forum/viewtopic.php?t=49713
championx



Joined: 28 Feb 2006
Posts: 151

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PostPosted: Mon Mar 09, 2015 4:26 pm     Reply with quote

Hi PCM thanks for your answer! yes, that is the first thing that i did, it detects the chip with the address 9A which is correct when both A0 and A1 are tied to ground.

Im really stuck here...
dyeatman



Joined: 06 Sep 2003
Posts: 1938
Location: Norman, OK

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PostPosted: Mon Mar 09, 2015 5:27 pm     Reply with quote

What frequency xtal are you running on the SC16?
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championx



Joined: 28 Feb 2006
Posts: 151

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PostPosted: Tue Mar 10, 2015 6:10 am     Reply with quote

Hi dyeatman! im running it a 11.052mhz.

Something weird... if i measure the xtal with an scope i dont see the 11mhz
temtronic



Joined: 01 Jul 2010
Posts: 9254
Location: Greensville,Ontario

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PostPosted: Tue Mar 10, 2015 7:40 am     Reply with quote

What value xtal caps have you used ???

Jay
championx



Joined: 28 Feb 2006
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PostPosted: Tue Mar 10, 2015 7:52 am     Reply with quote

I use 33pf and 22pf. Is that too much?
championx



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PostPosted: Tue Mar 10, 2015 8:23 am     Reply with quote

IT WORKS!

Thanks for the help... it turns out that the company that assemblies the boards made a mistake on the XTAL capacitors, so i replace both for 22pf and worked at the first attempt....

2 days of my life lost cause of two caps... Mad

thanks for the help.
temtronic



Joined: 01 Jul 2010
Posts: 9254
Location: Greensville,Ontario

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PostPosted: Tue Mar 10, 2015 8:47 am     Reply with quote

Good to here you're 'up and running' !

33 puff too much for an 11MHz xtal, 15-22 puff would be my gut feeling.

I know how easy it is to 'misplace' parts in the wrong bin. Only two days is not bad. I lost 3 weeks to an unsoldered wiper on a trim pot. It 'made' connection due to a fairly tight fit but when the board got cold, it nicely 'disconnected', perfectly centered in the hole.sigh....the good old dayze !

Jay
championx



Joined: 28 Feb 2006
Posts: 151

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PostPosted: Tue Mar 10, 2015 9:54 am     Reply with quote

haha! Yes temtronic! and when the caps are SMD 0805 it is very hard to know if the value is ok.

well... thanks a lot for your help!
Ttelmah



Joined: 11 Mar 2010
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PostPosted: Tue Mar 10, 2015 10:03 am     Reply with quote

The classic one if the 'decimal slip'. 22nF, for 22pF etc..
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