AVR Freaks

 ATmega640/V-1280/V-1281/V-2560/V-2561/V Datasheet wrote:

The Power Reduction SPI bit, PRSPI, in “PRR0 – Power Reduction Register 0” on page 55 on page 50 must be written to zero to enable SPI module.

 

http://www.atmel.com/Images/Atme... - immediately above Figure 21-1 on page 190

Have you done that?

 

Depending on the optimization, it may not be setting registers at that point yet.
What happens if you put a breakpoint outside the function?

  SPI_MasterInit ();
  _NOP (); // set break point

In the OP he said:

SleepyOak wrote:

with an AVR Dragon

which is curious - as clearly that is not what is being used to debug here.

kabasan wrote:

He does not want to clear SPI2X, he is writing a setting value of 0.

So why has he written

SPSR = (0<<SPI2X);

and not just

SPSR = 0;

then?

 

It certainly looks like he has misunderstood the bit manipulation ...

It is not a solution of the issue, but it is also worth to mention, that there should be

SPCR = (1<<SPE)|(1<<MSTR)|(0<<SPR1)|(1<<SPR0)

instead of

SPCR = (1<<SPE)|(1<<MSTR)|(0<SPR1)|(1<<SPR0)

assuming, of course, that it is better than

SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR0)

 

So it looks like a faulty ADTF file then.

 

Just checking - this is .1417 and your DFPs are up to date ?

SleepyOak wrote:

Could the problem be because of the software? should I try to reinstall atmel or perhaps use another computer?

It is totally unlikely for me that this could help. Currently I have two suggestions:

 

1. Check what happens to SPCR with the code like this:

#include <what has to be included>

volatile int n;

int main ()
{
    SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR0);
    n = 1; // this line is only to allow you to enter here with debugger
}

2. Check what happens to SPCR with your current code built with all optimizations turned off.

Does the code actually work on the chip?

 

What happens if you add code to read the register into a variable, then examine that variable in the debugger? or send it to the serial port?

 

Do you have access to another debugger; eg, AtmelICE ... ?