#include <stdio.h>
#include "conf_usb.h"
#include "conf_audio_player.h"
#include "audio_mixer.h"
#include "usb_drv.h"
#include "usb_stream_player.h"
#include "conf_cs2200.h"
#include "cs2200.h"
#include "cycle_counter.h"
#include "gpio.h"
#include "twi.h"

Macros
#define	BROKEN_STREAM_TIMER 4000

#define	CS2200_FREF FOSC0

#define	TIMER_USB_RESYNC_CORRECTION 320

Functions
void	dac_sample_sent_cb (void)
	This callback function is called when the DAC interrupt has sent the buffer 'n-1' and switches to buffer 'n'. More...

void	dac_underflow_cb (void)
	This callback function is called when the PWM DAC interrupt does not have any more audio samples (i.e. More...

void	player_init (void)

void	player_shutdown (void)

uint32_t	usb_stream_get_buffer_level ()
	This function returns the number of full buffers. More...

uint16_t	usb_stream_get_counter ()
	This function returns the internal audio counter. More...

uint16_t	usb_stream_get_stream_status ()
	This function returns the audio status. More...

void	usb_stream_init (uint32_t sample_rate_hz, uint8_t num_channels, uint8_t bits_per_sample, bool swap_channels)
	This function initializes the USB Stream driver. More...

int	usb_stream_input (usb_stream_side_t side, uint8_t pipe_in, uint32_t *pFifoCount)
	This function takes the stream coming from the selected USB pipe and sends it to the DAC driver. More...

bool	usb_stream_new_sample_rate (uint32_t sample_rate)
	Sync the sample rate of the audio output stream with the USB stream. More...

int32_t	usb_stream_ppm_get (void)
	This function returns the PPM differences between the input audio stream frequency and the DAC output frequency. More...

void	usb_stream_resync (void)
	This function ensures that no underflow/underflow will never occur by adjusting the SSC/ABDAC frequencies. More...

Variables
static t_cpu_time	broken_stream_timer

uint32_t	buf_trace []

t_cpu_time	usb_resync_timer

volatile uint16_t	usb_stream_cnt =0

usb_stream_context_t *	usb_stream_context = NULL

static uint32_t	usb_stream_resync_freq_ofst =0

uint32_t	usb_stream_resync_frequency =0
	CS2200 out frequency. More...

static uint16_t	usb_stream_resync_last_room =0

static int16_t	usb_stream_resync_ppm_ofst =0

static uint32_t	usb_stream_resync_step =0

#define BROKEN_STREAM_TIMER 4000

Referenced by usb_stream_init(), and usb_stream_input().

#define CS2200_FREF FOSC0

Referenced by usb_stream_input(), and usb_stream_resync().

#define TIMER_USB_RESYNC_CORRECTION 320

Referenced by usb_stream_input(), and usb_stream_resync().

void dac_sample_sent_cb ( void )

This callback function is called when the DAC interrupt has sent the buffer 'n-1' and switches to buffer 'n'.

The aim of this function is thus to prepare the buffer 'n+1'; so that there is always a pending buffer for the interrupt.

References audio_mixer_dacs_output_direct(), usb_stream_context_t::bits_per_sample, usb_stream_context_t::channel_count, usb_stream_context_t::status, usb_stream_context_t::synchronized, USB_STREAM_ERROR_NOT_SYNCHRONIZED, usb_stream_fifo_get(), usb_stream_fifo_get_used_room(), and usb_stream_fifo_pull().

void dac_underflow_cb ( void )

This callback function is called when the PWM DAC interrupt does not have any more audio samples (i.e.

"famine").

References usb_stream_context_t::status, usb_stream_context_t::synchronized, and USB_STREAM_ERROR_NOT_SYNCHRONIZED.

void player_init ( void )

Referenced by device_audio_task_init().

void player_shutdown ( void )

References audio_mixer_dacs_flush_direct().

uint32_t usb_stream_get_buffer_level ( void )

This function returns the number of full buffers.

References usb_stream_fifo_get_used_room().

uint16_t usb_stream_get_counter ( void )

This function returns the internal audio counter.

References usb_stream_cnt.

uint16_t usb_stream_get_stream_status ( void )

This function returns the audio status.

References usb_stream_context_t::status.

void usb_stream_init	(	uint32_t	sample_rate_hz,
		uint8_t	num_channels,
		uint8_t	bits_per_sample,
		bool	swap_channels
	)

int usb_stream_input	(	usb_stream_side_t	side,
		uint8_t	pipe_in,
		uint32_t *	pFifoCount
	)

This function takes the stream coming from the selected USB pipe and sends it to the DAC driver.

Moreover, it ensures that both input and output stream keep synchronized by adding or deleting samples.

Parameters

side	USB_STREAM_HOST for USB host, USB_STREAM_DEVICE for device.
pipe_in	Number of the addressed pipe/endpoint
pFifoCount	(return parameter) NULL or pointer to the number of used buffers at this time

Returns: status: (USB_STREAM_STATUS_OK, USB_STREAM_STATUS_NOT_SYNCHRONIZED, USB_STREAM_STATUS_SPEED_UP, USB_STREAM_STATUS_SLOW_DOWN, USB_STREAM_STATUS_BUFFER_OVERFLOW)

References _32_BITS_RATIO, audio_mixer_dacs_output_direct(), usb_stream_context_t::bits_per_sample, BROKEN_STREAM_TIMER, usb_stream_context_t::channel_count, cpu_is_timeout(), cpu_ms_2_cy(), cpu_set_timeout(), CS2200_FREF, cs2200_freq_clk_out(), FCPU_HZ, Host_byte_count, Host_reset_pipe_fifo_access, PPM, UnionPtr::s16ptr, UnionPtr::s32ptr, UnionPtr::s8ptr, usb_stream_context_t::status, swap16, swap32, usb_stream_context_t::synchronized, TIMER_USB_RESYNC_CORRECTION, Usb_byte_count, usb_read_ep_rxpacket(), Usb_reset_endpoint_fifo_access, USB_STREAM_BUFFER_NUMBER, usb_stream_cnt, USB_STREAM_DEVICE, USB_STREAM_ERROR_BROKEN_STREAM, USB_STREAM_ERROR_NO_DATA, USB_STREAM_ERROR_NONE, USB_STREAM_ERROR_NOT_SYNCHRONIZED, USB_STREAM_ERROR_OVERFLOW, usb_stream_fifo_get(), usb_stream_fifo_get_buffer(), usb_stream_fifo_get_used_room(), usb_stream_fifo_pull(), usb_stream_fifo_push(), USB_STREAM_HOST, USB_STREAM_REAL_BUFFER_SIZE, usb_stream_resync_freq_ofst, usb_stream_resync_frequency, usb_stream_resync_last_room, usb_stream_resync_ppm_ofst, USB_STREAM_RESYNC_PPM_STEPS, usb_stream_resync_step, and usb_stream_context_t::wr_id.