SAM4S und MAX31865

#include <asf.h>

#include "sam_gpio\sam_gpio.h"

void init_spi(void)

{

  spi_flags_t spi_flags = SPI_MODE; // MODE 1, 100KHz

  board_spi_select_id_t spi_select_id = SPI_DEVICE_ID;

  spi_master_init(SPI0);

  spi_master_setup_device(SPI0, &device, spi_flags, SPI_SPEED, spi_select_id);

  spi_enable(SPI0);

}

void send_data(uint8_t Register, uint8_t Data, Pio *pinlocation, uint32_t pin)

{

  uint8_t command[2] = {Register,Data};

  pio_clear(pinlocation,pin);// Clear CS Pin

  spi_write_packet(SPI0, command, sizeof(command));

  while(!(SPI0->SPI_SR & SPI_SR_TXEMPTY));

  pio_set(pinlocation,pin);// Set CS Pin

}

uint16_t receive_data_16bit(uint8_t address, Pio *pinlocation, uint32_t pin)

{

  uint8_t rx[2] = {0,0};

  pio_clear(pinlocation,pin);// Clear CS Pin

  spi_write_packet(SPI0, &address, sizeof(address));

  while(!(SPI0->SPI_SR & SPI_SR_TXEMPTY));// Wait till transfer is done

  spi_read_packet(SPI0,rx,sizeof(rx));

  pio_set(pinlocation,pin);// Set CS Pin

  return ((uint16_t)rx[0]<<8) | rx[1];// Return shifted Value (MSB first)

}

int main (void)

{    

  board_init();

  sysclk_init();

  pmc_enable_periph_clk(ID_PIOA);// Enable GPIO Clock

  pio_set_output(PIOA, PIO_PA11, HIGH, DISABLE, ENABLE);// Set CS Pin to output and high

  pio_set_input(PIOA,PIO_PA12,IOPORT_MODE_PULLDOWN);// Set MISO as input

  init_spi();

  uint16_t rx=0;  

  while (1) {

    delay_us(10);                

    send_data(0x80,0x01, PIOA, PIO_PA11);// Send 50Hz filter to config Register

    delay_us(10);                

    rx = receive_data_16bit(0x00, PIOA, PIO_PA11);// Read config Register

    rx = receive_data_16bit(0x03, PIOA, PIO_PA11);// Read High Fault Threshold Register 

  }

}