abdacb_example.c File Reference

Audio Bitstream DAC Example for SAM4L.

Copyright (c) 2013-2018 Microchip Technology Inc. and its subsidiaries.

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

Macros
#define	PDCA_ABDAC_CHANNEL0   0
#define	PDCA_ABDAC_CHANNEL1   1
#define	SOUND_SAMPLES   0x100

Functions
static void	config_buttons (void)
static void	configure_console (void)
	Configure UART console. More...
static void	display_menu (void)
	Display the user menu on the terminal. More...
static void	eic_5_callback (void)
	EIC interrupt handler for push button interrupt. More...
int	main (void)
	Application entry point for ABDAC example. More...

Variables
volatile bool	exit_flag = false
struct abdac_config	g_abdac_cfg
	ABDAC configuration. More...
struct abdac_dev_inst	g_abdac_inst
	ABDAC instance. More...
static const pdca_channel_config_t	pdca_abdac_config0
static const pdca_channel_config_t	pdca_abdac_config1
int16_t	samples_left [SOUND_SAMPLES]
int16_t	samples_right [SOUND_SAMPLES]

#define PDCA_ABDAC_CHANNEL0   0

Referenced by main().

#define PDCA_ABDAC_CHANNEL1   1

Referenced by main().

#define SOUND_SAMPLES   0x100

Referenced by main().

static void config_buttons ( void  )

static

References eic_5_callback(), EIC_ASYNCH_MODE, EIC_EDGE_FALLING_EDGE, eic_enable(), EIC_FILTER_DISABLED, EIC_LEVEL_LOW_LEVEL, eic_line_enable(), eic_line_set_callback(), eic_line_set_config(), EIC_MODE_EDGE_TRIGGERED, and GPIO_PUSH_BUTTON_EIC_LINE.

Referenced by main().

static void configure_console ( void  )

static

Configure UART console.

References uart_rs232_options::baudrate, CONF_UART, CONF_UART_BAUDRATE, CONF_UART_CHAR_LENGTH, CONF_UART_PARITY, CONF_UART_STOP_BITS, and stdio_serial_init().

Referenced by main().

static void display_menu ( void  )

static

Display the user menu on the terminal.

Referenced by main().

static void eic_5_callback ( void  )

static

EIC interrupt handler for push button interrupt.

References eic_line_clear_interrupt(), eic_line_interrupt_is_pending(), exit_flag, and GPIO_PUSH_BUTTON_EIC_LINE.

Referenced by config_buttons().

int main

(

void

)

Application entry point for ABDAC example.

Returns

Unused (ANSI-C compatibility).

Wait until the reload register is empty. This means that one transmission is still ongoing but we are already able to set up the next transmission.

References abdac_clear_interrupt_flag(), ABDAC_DATE_16BIT, abdac_enable(), abdac_get_config_defaults(), abdac_init(), ABDAC_INTERRUPT_TXRDY, ABDAC_INTERRUPT_TXUR, ABDAC_SAMPLE_RATE_11025, abdac_set_volume0(), abdac_set_volume1(), board_init(), BOARD_NAME, abdac_config::cmoc, config_buttons(), configure_console(), abdac_config::data_word_format, display_menu(), exit_flag, g_abdac_cfg, g_abdac_inst, abdac_config::mono, PDCA_ABDAC_CHANNEL0, PDCA_ABDAC_CHANNEL1, PDCA_CH_COUNTER_RELOAD_IS_ZERO, pdca_channel_enable(), pdca_channel_set_config(), pdca_channel_write_reload(), pdca_enable(), pdca_get_channel_status(), abdac_config::sample_rate_hz, samples_left, samples_right, SOUND_SAMPLES, sound_table, STATUS_OK, and sysclk_init().

volatile bool exit_flag = false

Referenced by eic_5_callback(), and main().

struct abdac_config g_abdac_cfg

ABDAC configuration.

Referenced by main().

struct abdac_dev_inst g_abdac_inst

ABDAC instance.

Referenced by main().

const pdca_channel_config_t pdca_abdac_config0

static

Initial value:

= {
    .addr = 0,   
    .pid = ABDACB_PDCA_ID_TX_CH0,     
    .size = 0,   
    .r_addr = 0,                   
    .r_size = 0,                   
    .ring = false,                 
    .transfer_size = PDCA_MR_SIZE_HALF_WORD 
}

const pdca_channel_config_t pdca_abdac_config1

static

Initial value:

= {
    .addr = 0,   
    .pid = ABDACB_PDCA_ID_TX_CH1,     
    .size = 0,   
    .r_addr = 0,                   
    .r_size = 0,                   
    .ring = false,                 
    .transfer_size = PDCA_MR_SIZE_HALF_WORD 
}

int16_t samples_left[SOUND_SAMPLES]

Referenced by main().

int16_t samples_right[SOUND_SAMPLES]

Referenced by main().