adpcm_wav_player/adpcm_example.c File Reference

#include <avr32/io.h>
#include <stdio.h>
#include "compiler.h"
#include "board.h"
#include "dsp.h"
#include "pm.h"
#include "gpio.h"
#include "usart.h"
#include "intc.h"
#include "pwm.h"
#include "flashc.h"
#include "preprocessor.h"
#include "ima_dvi_adpcm_wav.h"

Data Structures
struct	A_PACKED
struct	A_PACKED
struct	A_PACKED
struct	A_PACKED
struct	A_PACKED

Macros
#define	BYTE   unsigned char
#define	CP_PBA_SPEED   48000000
	The clock frequency. More...
#define	DAC_PWM_FREQUENCY   (CP_PBA_SPEED >> 8)
#define	DWORD   unsigned long
#define	MAX_SEARCH_LENGTH   256
#define	SWITCH_ENDIANNESS(width, data)   (TPASTE2(Swap, width)(data))
#define	WAVE_FORMAT_DVI_ADPCM   0x0011
#define	WORD   unsigned short
USART Settings
#define	EXAMPLE_USART   (&AVR32_USART1)
#define	EXAMPLE_USART_RX_PIN   AVR32_USART1_RXD_0_0_PIN
#define	EXAMPLE_USART_RX_FUNCTION   AVR32_USART1_RXD_0_0_FUNCTION
#define	EXAMPLE_USART_TX_PIN   AVR32_USART1_TXD_0_0_PIN
#define	EXAMPLE_USART_TX_FUNCTION   AVR32_USART1_TXD_0_0_FUNCTION
#define	DAC_PWM_CHANNEL_LSB   1
#define	DAC_PWM_CHANNEL_LSB_PIN
#define	DAC_PWM_CHANNEL_MSB   0
#define	DAC_PWM_CHANNEL_MSB_PIN

Typedefs
typedef struct A_PACKED	s_wave_data
typedef struct A_PACKED	s_wave_dvi_block_header
typedef struct A_PACKED	s_wave_fmt
typedef struct A_PACKED	s_wave_fmt_dvi
typedef struct A_PACKED	s_wave_riff

Functions
void	dac_pwm_init ()
	Initialize the PWM to make it works as a DAC. More...
static void	dac_pwm_int_handler (void)
	The PWM interrupt handler. More...
int	fget_struct (const char *_data, char *_ptr, int size, char *_start_str)
void	init_usart ()
	this function initializes the USART module at 115200 bauds More...
int	main (int argc, char *argv[])
	The main function. More...
void	print_fct (char *str)
	This function is used by the debugging module. It permits to print a string through the USART. More...
void	sys_cpu_48MHz (void)
	To set the clock frequency to 48MHz. More...

Variables
int	cur_i_read_buffer = 0
	The offset of the current reading buffer. More...
volatile int	dac_pwm_period
int	dac_pwm_periods_per_sample
volatile int	get_sample = 0
	A flag to tell if we need to play a new sample with the DAC. More...
A_ALIGNED short	predicted_value
	Predicted value for the adpcm decoder. More...
A_ALIGNED short	step_index
	Step index for the adpcm decoder. More...

#define BYTE   unsigned char

#define CP_PBA_SPEED   48000000

The clock frequency.

#define DAC_PWM_CHANNEL_LSB   1

Referenced by dac_pwm_init(), and main().

#define DAC_PWM_CHANNEL_LSB_PIN

Referenced by dac_pwm_init().

#define DAC_PWM_CHANNEL_MSB   0

Referenced by dac_pwm_init(), and main().

#define DAC_PWM_CHANNEL_MSB_PIN

Referenced by dac_pwm_init().

#define DAC_PWM_FREQUENCY   (CP_PBA_SPEED >> 8)

Referenced by main().

#define DWORD   unsigned long

#define EXAMPLE_USART   (&AVR32_USART1)

Referenced by init_usart(), main(), and print_fct().

#define EXAMPLE_USART_RX_FUNCTION   AVR32_USART1_RXD_0_0_FUNCTION

Referenced by init_usart().

#define EXAMPLE_USART_RX_PIN   AVR32_USART1_RXD_0_0_PIN

Referenced by init_usart().

#define EXAMPLE_USART_TX_FUNCTION   AVR32_USART1_TXD_0_0_FUNCTION

Referenced by init_usart().

#define EXAMPLE_USART_TX_PIN   AVR32_USART1_TXD_0_0_PIN

Referenced by init_usart().

#define MAX_SEARCH_LENGTH   256

Referenced by fget_struct().

#define SWITCH_ENDIANNESS	(		width,
			data
	)		(TPASTE2(Swap, width)(data))

Referenced by main().

#define WAVE_FORMAT_DVI_ADPCM   0x0011

Referenced by main().

#define WORD   unsigned short

typedef struct A_PACKED s_wave_data

typedef struct A_PACKED s_wave_dvi_block_header

typedef struct A_PACKED s_wave_fmt

typedef struct A_PACKED s_wave_fmt_dvi

typedef struct A_PACKED s_wave_riff

void dac_pwm_init

(

)

Initialize the PWM to make it works as a DAC.

References ATPASTE4, DAC_PWM_CHANNEL_LSB, DAC_PWM_CHANNEL_LSB_PIN, DAC_PWM_CHANNEL_MSB, DAC_PWM_CHANNEL_MSB_PIN, dac_pwm_int_handler(), gpio_enable_module(), and INTC_register_interrupt().

static void dac_pwm_int_handler ( void  )

static

The PWM interrupt handler.

References dac_pwm_period, and get_sample.

Referenced by dac_pwm_init().

int fget_struct	(	const char *	_data,
		char *	_ptr,
		int	size,
		char *	_start_str
	)

References i, j, and MAX_SEARCH_LENGTH.

Referenced by main().

void init_usart

(

)

this function initializes the USART module at 115200 bauds

References usart_options_t::baudrate, EXAMPLE_USART, EXAMPLE_USART_RX_FUNCTION, EXAMPLE_USART_RX_PIN, EXAMPLE_USART_TX_FUNCTION, EXAMPLE_USART_TX_PIN, FOSC0, gpio_enable_module(), USART_1_STOPBIT, usart_init_rs232(), USART_NO_PARITY, and USART_NORMAL_CHMODE.

int main	(	int	argc,
		char *	argv[]
	)

The main function.

References A_PACKED::avg_bytes_per_sec, A_PACKED::bits_per_sample, A_PACKED::block_align, c, A_PACKED::chunk_size, A_PACKED::compression_code, cur_i_read_buffer, DAC_PWM_CHANNEL_LSB, DAC_PWM_CHANNEL_MSB, DAC_PWM_FREQUENCY, dac_pwm_init(), dac_pwm_period, dac_pwm_periods_per_sample, Disable_global_interrupt, dsp_adpcm_ima_decode_nibble(), Enable_global_interrupt, EXAMPLE_USART, A_PACKED::extra_bytes, fget_struct(), flashc_set_wait_state(), A_PACKED::fmt, get_sample, i, init_usart(), INTC_init_interrupts(), A_PACKED::isamp0, j, length, A_PACKED::nb_channels, predicted_value, A_PACKED::sample_rate, A_PACKED::samples_per_block, sound_data, sprintf(), step_index, A_PACKED::step_table_index, SWITCH_ENDIANNESS, sys_cpu_48MHz(), usart_write_line(), and WAVE_FORMAT_DVI_ADPCM.

void print_fct

(

char *

str

)

This function is used by the debugging module. It permits to print a string through the USART.

Parameters

str	The input string to print.

Precondition

It as to be used after having initializing the USART module.

References EXAMPLE_USART, and usart_write_line().

void sys_cpu_48MHz

(

void

)

To set the clock frequency to 48MHz.

References FOSC0, OSC0_STARTUP, pm_cksel(), pm_pll_enable(), pm_pll_set_option(), pm_pll_setup(), pm_switch_to_clock(), pm_switch_to_osc0(), pm_wait_for_pll0_locked(), and TRUE.

int cur_i_read_buffer = 0

The offset of the current reading buffer.

volatile int dac_pwm_period

int dac_pwm_periods_per_sample

volatile int get_sample = 0

A flag to tell if we need to play a new sample with the DAC.

A_ALIGNED short predicted_value

Predicted value for the adpcm decoder.

A_ALIGNED short step_index

Step index for the adpcm decoder.