I did change the SPI Pins going from 10,11,12,13 to the corresponding right ones 50,51,52,53. I jumpered from 10 to 53, 11 to 51, 12 to 50, 13 to 52 like i should.
The Shield doesnt work at all that means i receive no incoming midi data, no data led flashes, no sound comes out on the Audio Out.
It worked on the Duemillanove. The Mega Board is OK as it is my second one, because i replaced it already.
Maybe there has to be changes to the Hardware.pde. I looked everything up but dont really get behind it well. Thats the Code
// Hardware Setup
extern uint16_t SynthEngine_ProcessSample() ;
//Timer2 setup This is the audio rate timer, fires an interrupt at 15625 Hz sampling rate
TIMSK2 = 1<<OCIE2A; // interrupt enable audio timer
OCR2A = 127;
TCCR2A = 2; // CTC mode, counts up to 127 then resets
TCCR2B = 0<<CS22 | 1<<CS21 | 0<<CS20; // different for atmega8 (no 'B' i think)
SPCR = 0x50; // set up SPI port SPCR = 01010000,
SPSR = 0x01; //
DDRB |= 0x2E; // PB output for DAC CS, and SPI port
PORTB |= (1<<1); // CS high
sei(); // global interrupt enable
uint8_t dacSPI0; // the two bytes that go to the DAC over SPI
// Timer 2 interrupt routine calling the synth engine for every sample
OCR2A = 127;
//PORTB &= ~(1<<1); // Frame sync low for SPI (making it low here so that we can measure length of interrupt with scope)
uint16_t sample = SynthEngine_ProcessSample();
// format sample for SPI port
dacSPI0 = sample >> 8;
dacSPI0 >>= 4;
//dacSPI0 |= 0x30; // Write to DAC-A, unbuffered VREF, gain=1x, Output Power Down Control bit (low impedence out?),
dacSPI0 |= 0x70; //buffered VRef
dacSPI1 = sample >> 4;
// transmit value out the SPI port
PORTB &= ~(1<<1); // Frame sync low
SPDR = dacSPI0; //The SPI Data Register - Writing to the register initiates data transmission.
while (!(SPSR & (1<<SPIF))); //Wait for data to be sent over SPI, flag raised
SPDR = dacSPI1;
while (!(SPSR & (1<<SPIF)));
PORTB |= (1<<1); // Frame sync high
I dont really know if Port Registers and so on are 1:1 compatible from Duemillanove to Mega?
Hope someone can help