AVR-Chat

Wow... I feel like a major idiot. Thanks so much for your help... I'd 
probably be sitting here for another six hours trying to figure that one 
out. Works perfectly now.

- Robert

Larry Barello wrote:
> You have /SS set as an input.  It either needs to be tied high, or, made an
> output.  Read the data sheet w/regard to multi-master operation.
> 
> 
> -----------
> Larry Barello
> www.barello.net
> 
> 
> | -----Original Message-----
> | From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
> | Of Robert Ussery
> | 
> | Hi, all...
> | I'm having some trouble with an SPI interface on the Mega32, which I'm
> | using to communicate with a TI TLV2543 ADC. I'm programming the micro in
> | C using avr-gcc.
> | 
> | Here's my problem... using the SPI transmit code more or less straight
> | from the Mega32 datasheet:
> | 	SPDR = (channel<<4)|(ADCSetup);
> | 	while(!(SPSR & (1<<SPIF)));
> | my code keeps getting stuck in an infinite loop at that while()
> | statement, but only on the 30th iteration or so (the micro loops through
> | the ADC code indefinitely). The first 29ish times through the code,
> | everything works perfectly. Am I missing something with how to handle
> | the SPIF flag? I RTFM'd and all that, and it says that SPIF is set and
> | reset automatically based on the SPI state and when SPDR is read.
> | 
> | I've included all of my code at the end of this email, but here are some
> | of the more relevant parts:
> | SPI setup:
> | 	// Set MOSI and SCK output, all others input
> | 	DDRB = (1<<PB5)|(1<<PB7);
> | 	// Enable SPI, Master, set clock rate fck/128
> | 	SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR1)|(1<<SPR0);
> | 
> | The ADC code is contained in the function ADCRead(), as shown in the
> | code below.
> | 
> | Am I making some classic n00b mistake here? Any advice or pointers are
> | welcome.
> 
> 
> 
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