Exemplos de cs2200_freq_clk_adjust em C++ (Cpp)

Exemplo n.º 1

Arquivo: usb_stream_player_with_cs2200.c Projeto: AndreyMostovov/asf

//!
//! @brief This function ensures that no underflow/underflow will never occur
//! by adjusting the SSC/ABDAC frequencies.
void usb_stream_resync(void)
{
  if (!usb_stream_context->synchronized)
    return;

  if( !cpu_is_timeout(&usb_resync_timer) )
    return;

  if( twi_is_busy() )
    return;

  // time-out occur. Let's check frequency deviation.
  int nb_full_buffers = usb_stream_fifo_get_used_room();

  // Frequency control
  if( nb_full_buffers>USB_STREAM_BUFFER_NUMBER/2 )
  { // Need to increase the frequency
    if( nb_full_buffers >= usb_stream_resync_last_room )
    {
      usb_stream_resync_freq_ofst += usb_stream_resync_step;
      usb_stream_resync_ppm_ofst += USB_STREAM_RESYNC_PPM_STEPS;
      usb_stream_resync_last_room = nb_full_buffers;
      cs2200_freq_clk_adjust((uint16_t)_32_BITS_RATIO(usb_stream_resync_freq_ofst, CS2200_FREF));
      cpu_set_timeout( cpu_ms_2_cy(TIMER_USB_RESYNC_CORRECTION, FCPU_HZ), &usb_resync_timer );
    }
  }
  else if (nb_full_buffers<USB_STREAM_BUFFER_NUMBER/2 )
  { // Need to slow down the frequency
    if( nb_full_buffers <= usb_stream_resync_last_room )
    {
      usb_stream_resync_freq_ofst -= usb_stream_resync_step;
      usb_stream_resync_ppm_ofst -= USB_STREAM_RESYNC_PPM_STEPS;
      usb_stream_resync_last_room = nb_full_buffers;
      cs2200_freq_clk_adjust((uint16_t)_32_BITS_RATIO(usb_stream_resync_freq_ofst, CS2200_FREF));
      cpu_set_timeout( cpu_ms_2_cy(TIMER_USB_RESYNC_CORRECTION, FCPU_HZ), &usb_resync_timer );
    }
  }
}

Exemplo n.º 2

Arquivo: main.c Projeto: kerichsen/asf

/*! \brief Main function. Execution starts here.
 *
 * \retval 42 Fatal error.
 */
int main(void)
{
  uint32_t iter=0;
  uint32_t cs2200_out_freq=11289600;
  static bool b_sweep_up=true;
  static uint32_t freq_step=0;

  // USART options.
  static usart_serial_options_t USART_SERIAL_OPTIONS =
  {
    .baudrate     = USART_SERIAL_EXAMPLE_BAUDRATE,
    .charlength   = USART_SERIAL_CHAR_LENGTH,
    .paritytype   = USART_SERIAL_PARITY,
    .stopbits     = USART_SERIAL_STOP_BIT
  };

  // Initialize the TWI using the internal RCOSC
  init_twi(AVR32_PM_RCOSC_FREQUENCY);

  // Initialize the CS2200 and produce a default frequency.
  cs2200_setup(11289600, FOSC0);

  sysclk_init();

  // Initialize the board.
  // The board-specific conf_board.h file contains the configuration of the board
  // initialization.
  board_init();

  // Initialize the TWI
  init_twi(sysclk_get_pba_hz());

  // Initialize Serial Interface using Stdio Library
  stdio_serial_init(USART_SERIAL_EXAMPLE,&USART_SERIAL_OPTIONS);

  // Initialize the HMatrix.
  init_hmatrix();

  print_dbg("\r\nCS2200 Example\r\n");

  // Generate a 12.288 MHz frequency out of the CS2200.
  print_dbg("Output 12.288 MHz\r\n");
  cs2200_freq_clk_out(_32_BITS_RATIO(12288000, FOSC0));
  cpu_delay_ms( 10000, sysclk_get_cpu_hz());

  // Generate a 11.2896 MHz frequency out of the CS2200.
  print_dbg("Output 11.2896 MHz\r\n");
  cs2200_freq_clk_out(_32_BITS_RATIO(cs2200_out_freq, FOSC0));
  cpu_delay_ms( 10000, sysclk_get_cpu_hz());

  print_dbg("Sweep from 11.2896 MHz steps of 100 PPM\r\n");
  freq_step = PPM(cs2200_out_freq, 100);

  while(1)
  {
    uint32_t ratio;

    if(b_sweep_up)
    {
      if( iter<=10 )
      {
        print_dbg("Add 100 PPM\r\n");
        iter++;
        cs2200_out_freq += freq_step;
        ratio = _32_BITS_RATIO(cs2200_out_freq, FOSC0);
        cs2200_freq_clk_adjust((uint16_t)ratio);
        cpu_delay_ms( 1000, sysclk_get_cpu_hz());
        while( twi_is_busy() );
      }
      else
        b_sweep_up=false;
    }

    if(!b_sweep_up)
    {
      if( iter>0 )
      {
        print_dbg("Sub 100 PPM\r\n");
        iter--;
        cs2200_out_freq -= freq_step;
        ratio = _32_BITS_RATIO(cs2200_out_freq, FOSC0);
        cs2200_freq_clk_adjust((uint16_t)ratio);
        cpu_delay_ms( 1000, sysclk_get_cpu_hz());
        while( twi_is_busy() );
      }
      else
        b_sweep_up=true;
    }
  }
}