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HELP SPI on QFN IC and PIC 16F877 or 18f4685
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ketron82



Joined: 07 Jun 2010
Posts: 36

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PostPosted: Mon Jul 19, 2010 7:35 pm     Reply with quote
Many thanks for Reply,
I am newbie but I'm learning C for PIC because I have studied only C++ .
I have no hard "due date" for my project but I am interested to this project because I'm radio amateur and this chip is very beautiful and is able to do some thing that I can use in VHF! If I learn how to communicate with it, the rest is quite easy because I have enough experience in RF, HF, VHF, SHF (1.2Ghz - 2.4Ghz - 5Ghz - 10 Ghz)

So....I write in this forum because I have encountred this problem about Serial Bus communication.

I don't want that you must write code for me....It is not beautiful and not good for my learning....!

With your posts I learned a little better the reading of Datasheet and I will go on Smile . Many many thanks for your helps.

I will looking for send ACK command at the end of the i2c_read() function.
Some of my questions are silly but important for me because English datasheet and manual appear for me much complicated even if they are not!

Sorry and many thanks again
Fabio
ketron82



Joined: 07 Jun 2010
Posts: 36

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PostPosted: Sat Jul 24, 2010 2:10 pm     Reply with quote
Laughing Very Happy Mr. Green Mr. Green Mr. Green Very Happy Laughing
Some days ago after some tests I turned on the SI4703. I'm very happy!!
Laughing Very Happy Mr. Green Mr. Green Mr. Green Very Happy Laughing

I can controll all function that SI4703 implements.

I have now one problem.
I made some function to control all registers and all go well.
I encounter a problem when I set the INT_RDA interrupt.

I set the RS232 interrupt as I have always done but the program run well until I send string from PC to PIC.
When interrupt begin (I2C is always reading in while(1) loop) the PIC and SI4703 go down.

Int_rda and While(1) loop with i2c_read() are compatible??

Many thanks

Fabio
IZ0CBG
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Jul 24, 2010 4:02 pm     Reply with quote
Do you have the ERRORS parameter in your #use rs232() statement ?
If not, add it. Example:
Code:
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

This will prevent the UART receiver from locking up if you don't get
the characters from the UART in sufficient time. This could happen
if you disable #int_rda interrupts for too long. With 'ERRORS', you
will still lose characters if you don't get them (using getc or fgetc),
from the UART promptly, but at least the UART won't lock up.
You will still need to fix your program design so that you don't lose
characters.
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