DAC (TLV5616) gibt nichts aus

#define F_CPU 4000000UL

#include "spi.h"

#include <avr/io.h>

#include <util/delay.h>

int main(void)

{

  DDRB |= (1<<PB2) | (1<<PB3) | (1<<PB5);//ausgänge für SPI setzen

  setup_spi(SPI_MODE_2,SPI_MSB,SPI_NO_INTERRUPT,SPI_MSTR_CLK16);

  send_spi(0b01001111);// 4bit daten + control bits

  _delay_us(100);

  send_spi(0b11111111);// restlichen daten

  while(1)

    {

    }

}

/* 

 * Copyright (c) 2009 Andrew Smallbone <andrew@rocketnumbernine.com>

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 * 

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 * 

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#ifndef _spi_h__

#define _spi_h__

#include <avr/io.h>

#ifdef __cplusplus

extern "C"{

#endif

// create alias for the different SPI chip pins - code assumes all on port B

#if (defined(__AVR_AT90USB82__) || defined(__AVR_AT90USB162__))

 #define SPI_SS_PIN PORTB0

 #define SPI_SCK_PIN PORTB1

 #define SPI_MOSI_PIN PORTB2

 #define SPI_MISO_PIN PORTB3

#elif (defined(__AVR_ATmega48__) || defined(__AVR_ATmega88__) || defined(__AVR_ATmega168__) || defined(__AVR_ATmega328__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega8__))

 #define SPI_SS_PIN PORTB2

 #define SPI_SCK_PIN PORTB5

 #define SPI_MOSI_PIN PORTB3

 #define SPI_MISO_PIN PORTB4

#else

 #error unknown processor - add to spi.h

#endif

// SPI clock modes

#define SPI_MODE_0 0x00 /* Sample (Rising) Setup (Falling) CPOL=0, CPHA=0 */

#define SPI_MODE_1 0x01 /* Setup (Rising) Sample (Falling) CPOL=0, CPHA=1 */

#define SPI_MODE_2 0x02 /* Sample (Falling) Setup (Rising) CPOL=1, CPHA=0 */

#define SPI_MODE_3 0x03 /* Setup (Falling) Sample (Rising) CPOL=1, CPHA=1 */

// data direction

#define SPI_LSB 1 /* send least significant bit (bit 0) first */

#define SPI_MSB 0 /* send most significant bit (bit 7) first */

// whether to raise interrupt when data received (SPIF bit received)

#define SPI_NO_INTERRUPT 0

#define SPI_INTERRUPT 1

// slave or master with clock diviser

#define SPI_SLAVE 0xF0

#define SPI_MSTR_CLK4 0x00 /* chip clock/4 */

#define SPI_MSTR_CLK16 0x01 /* chip clock/16 */

#define SPI_MSTR_CLK64 0x02 /* chip clock/64 */

#define SPI_MSTR_CLK128 0x03 /* chip clock/128 */

#define SPI_MSTR_CLK2 0x04 /* chip clock/2 */

#define SPI_MSTR_CLK8 0x05 /* chip clock/8 */

#define SPI_MSTR_CLK32 0x06 /* chip clock/32 */

// setup spi

void setup_spi(uint8_t mode,   // timing mode SPI_MODE[0-4]

         int dord,             // data direction SPI_LSB|SPI_MSB

         int interrupt,        // whether to raise interrupt on recieve

         uint8_t clock); // clock diviser

// disable spi

void disable_spi(void);

// send and receive a byte of data (master mode)

uint8_t send_spi(uint8_t out);

// receive the byte of data waiting on the SPI buffer and

// set the next byte to transfer - for use in slave mode

// when interrupts are enabled.

uint8_t received_from_spi(uint8_t out);

#ifdef __cplusplus

} // extern "C"

#endif

#endif

/* 

 * Copyright (c) 2009 Andrew Smallbone <andrew@rocketnumbernine.com>

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 * 

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 * 

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "spi.h"

#ifdef __cplusplus

extern "C"{

#endif

#ifdef __ARDUINO__

#include <wiring.h>

#endif

void setup_spi(uint8_t mode, int dord, int interrupt, uint8_t clock)

{

  // specify pin directions for SPI pins on port B

  if (clock == SPI_SLAVE) { // if slave SS and SCK is input

    DDRB &= ~(1<<SPI_MOSI_PIN); // input

    DDRB |= (1<<SPI_MISO_PIN); // output

    DDRB &= ~(1<<SPI_SS_PIN); // input

    DDRB &= ~(1<<SPI_SCK_PIN);// input

  } else {

    DDRB |= (1<<SPI_MOSI_PIN); // output

    DDRB &= ~(1<<SPI_MISO_PIN); // input

    DDRB |= (1<<SPI_SCK_PIN);// output

    DDRB |= (1<<SPI_SS_PIN);// output

  }

  SPCR = ((interrupt ? 1 : 0)<<SPIE) // interrupt enabled

    | (1<<SPE) // enable SPI

    | (dord<<DORD) // LSB or MSB

    | (((clock != SPI_SLAVE) ? 1 : 0) <<MSTR) // Slave or Master

    | (((mode & 0x02) == 2) << CPOL) // clock timing mode CPOL

    | (((mode & 0x01)) << CPHA) // clock timing mode CPHA

    | (((clock & 0x02) == 2) << SPR1) // cpu clock divisor SPR1

    | ((clock & 0x01) << SPR0); // cpu clock divisor SPR0

  SPSR = (((clock & 0x04) == 4) << SPI2X); // clock divisor SPI2X

}

void disable_spi()

{

  SPCR = 0;

}

uint8_t send_spi(uint8_t out)

{

  SPDR = out;

  while (!(SPSR & (1<<SPIF)));

  return SPDR;

}

uint8_t received_from_spi(uint8_t data)

{

  SPDR = data;

  return SPDR;

}