wm8731_example.c File Reference

WM8731 example for SAM.

#include <asf.h>
#include "xmodem.h"

Data Structures
struct	wav_header

Macros
#define	BITS_BY_SLOT   (16)
	Bits per slot. More...
#define	DMA_CH   0
#define	MAX_WAV_SIZE   0x800000
	Maximum size in bytes of the WAV file. More...
#define	RECORD_ADDRESS   (WAV_FILE_ADDRESS + MAX_WAV_SIZE)
	Address at which the recorded sample is stored. More...
#define	SAMPLE_RATE   (48000)
	Wav feature. More...
#define	SLOT_BY_FRAME   (2)
	Wav slot per frame. More...
#define	WAV_CHUNKID   0x46464952
#define	WAV_FORMAT   0x45564157
#define	WAV_SUBCHUNKID   0x20746D66

Functions
static void	configure_console (void)
	Configure the console UART. More...
static void	display_menu (void)
	Displays the user menu on the DBGU. More...
static void	display_wav_info (void)
	Display the information of the WAV file (sample rate, stereo/mono and frame size). More...
void	DMAC_Handler (void)
	ISR for DMA interrupt. More...
static void	init_dac (void)
	Initial the WM8731 to play back the sample WAV file. More...
static void	init_dma (void)
	DMA driver configuration. More...
static void	init_ssc (void)
	Initial the ssc interface. More...
static void	init_twi_wm8731 (void)
int	main (void)
	ssc_dma_audio Application entry point. More...
static void	ssc_dma (void *p_buffer, uint16_t us_size)
	Start DMA sending data. More...
static void	start_play_wav (uint32_t ul_wav_data_address, uint32_t ul_wav_size)
	Play a WAV file pre-loaded in PSRAM/SDRAM. More...
static void	stop_play_wav (void)
	Stop the current playback (if any). More...

Variables
static uint8_t	g_uc_is_wav_available = 0
	Indicates if there is wav data. More...
static uint8_t	g_uc_is_wav_playing = 0
	Indicates if the WAV file is currently being played. More...
static uint32_t	g_ul_remaining_bytes
	Number of samples that have not yet been transmitted. More...
static uint32_t	g_ul_transmitted_bytes
	Number of samples which have already been transmitted. More...
static struct wav_header *	p_wav_file
	Pointer to the playback WAV file header. More...

#define BITS_BY_SLOT   (16)

Bits per slot.

Referenced by init_ssc().

#define DMA_CH   0

Referenced by DMAC_Handler(), init_dma(), ssc_dma(), and stop_play_wav().

#define MAX_WAV_SIZE   0x800000

Maximum size in bytes of the WAV file.

#define RECORD_ADDRESS   (WAV_FILE_ADDRESS + MAX_WAV_SIZE)

Address at which the recorded sample is stored.

#define SAMPLE_RATE   (48000)

Wav feature.

Referenced by init_ssc().

#define SLOT_BY_FRAME   (2)

Wav slot per frame.

#define WAV_CHUNKID   0x46464952

Referenced by main().

#define WAV_FORMAT   0x45564157

Referenced by main().

#define WAV_SUBCHUNKID   0x20746D66

static void configure_console ( void  )

static

Configure the console UART.

References uart_rs232_options::baudrate, stdio_serial_init(), and sysclk_enable_peripheral_clock().

Referenced by main().

static void display_menu ( void  )

static

Displays the user menu on the DBGU.

References g_uc_is_wav_available, and g_uc_is_wav_playing.

Referenced by DMAC_Handler(), and main().

static void display_wav_info ( void  )

static

Display the information of the WAV file (sample rate, stereo/mono and frame size).

References wav_header::audio_format, wav_header::bits_per_sample, wav_header::block_align, wav_header::byte_rate, wav_header::chunk_id, wav_header::chunk_size, wav_header::format, wav_header::num_channels, wav_header::sample_rate, wav_header::sub_chunk1_id, wav_header::sub_chunk1_size, wav_header::sub_chunk2_id, wav_header::sub_chunk2_size, and uart_read().

Referenced by main().

void DMAC_Handler

(

void

)

ISR for DMA interrupt.

References wav_header::bits_per_sample, display_menu(), DMA_CH, dmac_get_status(), g_uc_is_wav_playing, g_ul_remaining_bytes, Min, and ssc_dma().

static void init_dac ( void  )

static

Initial the WM8731 to play back the sample WAV file.

References init_twi_wm8731(), pmc_disable_pck(), pmc_enable_pck(), PMC_PCK_0, pmc_switch_pck_to_mainck(), wm8731_dac_select(), wm8731_power_mode_dac(), WM8731_REG_DIGITAL_AUDIO_INTERFACE_FORMAT_I2S, WM8731_REG_DIGITAL_AUDIO_INTERFACE_FORMAT_IWL_16_BIT, wm8731_reset(), wm8731_set_active(), wm8731_set_dac_soft_mute(), wm8731_set_digital_audio_data_bit_length(), and wm8731_set_sampling_control().

Referenced by main().

static void init_dma ( void  )

static

DMA driver configuration.

References DMA_CH, dmac_channel_disable(), dmac_channel_set_configuration(), dmac_enable(), dmac_enable_interrupt(), dmac_init(), DMAC_PRIORITY_ROUND_ROBIN, dmac_set_priority_mode(), and pmc_enable_periph_clk().

Referenced by main().

static void init_ssc ( void  )

static

Initial the ssc interface.

References BITS_BY_SLOT, pmc_enable_periph_clk(), SAMPLE_RATE, ssc_disable_interrupt(), ssc_disable_tx(), ssc_reset(), ssc_set_clock_divider(), ssc_set_transmitter(), sysclk_get_peripheral_hz(), clock_opt_t::ul_ckg, clock_opt_t::ul_cki, clock_opt_t::ul_cko, clock_opt_t::ul_cks, data_frame_opt_t::ul_datlen, data_frame_opt_t::ul_datnb, data_frame_opt_t::ul_fsedge, data_frame_opt_t::ul_fslen, data_frame_opt_t::ul_fslen_ext, data_frame_opt_t::ul_fsos, data_frame_opt_t::ul_msbf, clock_opt_t::ul_period, clock_opt_t::ul_start_sel, and clock_opt_t::ul_sttdly.

Referenced by main().

static void init_twi_wm8731 ( void  )

static

References twi_options::chip, twi_options::master_clk, twi_options::speed, sysclk_get_peripheral_hz(), twi_master_setup(), TWI_WM8731, and WM8731_SLAVE_ADDRESS.

Referenced by init_dac().

int main

(

void

)

ssc_dma_audio Application entry point.

Returns

Unused (ANSI-C compatibility).

References board_init(), BOARD_NAME, wav_header::chunk_id, configure_console(), display_menu(), display_wav_info(), wav_header::format, g_uc_is_wav_available, g_uc_is_wav_playing, init_dac(), init_dma(), init_ssc(), pmc_enable_periph_clk(), wav_header::sample_rate, SDRAM_MICRON_MT48LC16M16A2, sdramc_init(), smc_set_cycle_timing(), smc_set_mode(), smc_set_pulse_timing(), smc_set_setup_timing(), start_play_wav(), stop_play_wav(), wav_header::sub_chunk1_size, wav_header::sub_chunk2_size, sysclk_get_peripheral_hz(), sysclk_init(), uart_read(), WAV_CHUNKID, WAV_FORMAT, and xmodem_receive_file().

static void ssc_dma ( void *  p_buffer, uint16_t  us_size  )

static

Start DMA sending data.

Parameters

p_buffer	Pointer to the data to be transmitted.
us_size	Size of the data to be transmitted.

References DMA_CH, dmac_channel_enable(), dmac_channel_single_buf_transfer_init(), NULL, ssc_enable_tx(), dma_transfer_descriptor_t::ul_ctrlA, dma_transfer_descriptor_t::ul_ctrlB, dma_transfer_descriptor_t::ul_descriptor_addr, dma_transfer_descriptor_t::ul_destination_addr, and dma_transfer_descriptor_t::ul_source_addr.

Referenced by DMAC_Handler(), and start_play_wav().

static void start_play_wav ( uint32_t  ul_wav_data_address, uint32_t  ul_wav_size  )

static

Play a WAV file pre-loaded in PSRAM/SDRAM.

Parameters

ul_wav_data_address	The address of the WAVE file.
ul_wav_size	Wave file size.

References wav_header::bits_per_sample, g_uc_is_wav_playing, g_ul_remaining_bytes, g_ul_transmitted_bytes, Min, and ssc_dma().

Referenced by main().

static void stop_play_wav ( void  )

static

Stop the current playback (if any).

References DMA_CH, dmac_channel_stop_transfer(), g_uc_is_wav_playing, and ssc_disable_tx().

Referenced by main().

uint8_t g_uc_is_wav_available = 0

static

Indicates if there is wav data.

Referenced by display_menu(), and main().

uint8_t g_uc_is_wav_playing = 0

static

Indicates if the WAV file is currently being played.

Referenced by display_menu(), DMAC_Handler(), main(), start_play_wav(), and stop_play_wav().

uint32_t g_ul_remaining_bytes

static

Number of samples that have not yet been transmitted.

Referenced by DMAC_Handler(), and start_play_wav().

uint32_t g_ul_transmitted_bytes

static

Number of samples which have already been transmitted.

Referenced by start_play_wav().

struct wav_header* p_wav_file

static

Initial value:

=
        (struct wav_header *)WAV_FILE_ADDRESS

Pointer to the playback WAV file header.