#include <avr32/io.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 "pdca.h"

Macros
#define	BUFFER_SIZE 2048
	The size of the buffer. More...

#define	CP_PBA_SPEED 48000000
	The clock frequency. More...

#define	DAC_PWM_FREQUENCY (CP_PBA_SPEED >> 8)

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 2

#define	DAC_PWM_CHANNEL_LSB_PIN

#define	DAC_PWM_CHANNEL_MSB 3

#define	DAC_PWM_CHANNEL_MSB_PIN

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...

void	init_pdca ()

void	init_usart ()
	this function initializes the USART module at 115200 bauds More...

int	main (int argc, char *argv[])
	The main function. More...

static void	pdca_interrupt_handler (void)

void	print_fct (char *str)
	This function is used by the debugging module. It permits to print a string through the USART. More...

void	set_new_dac_buffer (char *_next_buffer)
	Read the next block. More...

void	sys_cpu_48MHz (void)
	To set the clock frequency to 48MHz. More...

Variables
int	block_size
	The size of a block. More...

A_ALIGNED char	buffer [BUFFER_SIZE]
	The main buffer. More...

int	cur_i_buffer = 0
	The offset of the current writing buffer. More...

int	cur_i_read_buffer = 0
	The offset of the current reading buffer. More...

int	dac_pwm_period

int	dac_pwm_periods_per_sample

int	fill_activ = 0
	A flag to tell if the buffer is currently filled or not. More...

volatile int	get_new_block = 0
	A flag to tell if we need to get a new block from the USART. More...

volatile int	get_sample = 0
	A flag to tell if we need to play a new sample with the DAC. More...

int	nb_buffers
	The number of buffers. More...

char *	pbuffer_r
	A pointer on the current reading block. More...

char *	pbuffer_w
	A pointer on the current writing block. More...

int	pdca_channel_usart = 0
	In the example we will use the pdca channel 0. There is 17 possible pdca channel in AT32UC3A0512. 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 BUFFER_SIZE 2048

The size of the buffer.

Referenced by main(), and pdca_interrupt_handler().

#define CP_PBA_SPEED 48000000

The clock frequency.

#define DAC_PWM_CHANNEL_LSB 2

Referenced by dac_pwm_init(), and main().

#define DAC_PWM_CHANNEL_LSB_PIN

Referenced by dac_pwm_init().

#define DAC_PWM_CHANNEL_MSB 3

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 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().

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().

Referenced by main().

static void dac_pwm_int_handler ( void )

static

The PWM interrupt handler.

References dac_pwm_period, and get_sample.

Referenced by dac_pwm_init().

void init_pdca ( )

References pdca_channel_options_t::addr, buffer, INTC_register_interrupt(), NULL, pdca_channel_usart, pdca_init_channel(), pdca_interrupt_handler(), and PDCA_TRANSFER_SIZE_BYTE.

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.

Enable pdca transfer interrupt when completed

add the address of memory buffer

Enable pdca transfer interrupt when completed

add the address of memory buffer

Enable pdca transfer interrupt when completed

References block_size, buffer, BUFFER_SIZE, c, cur_i_buffer, 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, fill_activ, flashc_set_wait_state(), get_new_block, get_sample, i, init_pdca(), init_usart(), INTC_init_interrupts(), nb_buffers, pbuffer, pbuffer_r, pbuffer_w, pdca_channel_usart, pdca_enable(), pdca_enable_interrupt_transfer_complete(), pdca_reload_channel(), predicted_value, set_new_dac_buffer(), step_index, sys_cpu_48MHz(), and usart_putchar().

static void pdca_interrupt_handler ( void )

static

References block_size, buffer, BUFFER_SIZE, fill_activ, get_new_block, pbuffer_w, pdca_channel_usart, and pdca_disable_interrupt_transfer_complete().

Referenced by init_pdca().

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 set_new_dac_buffer ( char * _next_buffer )

Read the next block.

References cur_i_read_buffer, pbuffer_r, predicted_value, and step_index.

Referenced by main().

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 block_size

The size of a block.

Referenced by main(), membag_alloc(), membag_free(), membag_init(), pdca_interrupt_handler(), and udi_msc_trans_block().

A_ALIGNED char buffer[BUFFER_SIZE]

The main buffer.

int cur_i_buffer = 0

The offset of the current writing buffer.

Referenced by main().

int cur_i_read_buffer = 0

The offset of the current reading buffer.

Referenced by main(), and set_new_dac_buffer().

int dac_pwm_period

Referenced by dac_pwm_int_handler(), and main().

int dac_pwm_periods_per_sample

Referenced by main().

int fill_activ = 0

A flag to tell if the buffer is currently filled or not.

Referenced by main(), and pdca_interrupt_handler().

volatile int get_new_block = 0

A flag to tell if we need to get a new block from the USART.

Referenced by main(), and pdca_interrupt_handler().

volatile int get_sample = 0

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

int nb_buffers

The number of buffers.

Referenced by audio_mixer_create_buffers_direct(), and main().

char* pbuffer_r

A pointer on the current reading block.

char* pbuffer_w

A pointer on the current writing block.

int pdca_channel_usart = 0

In the example we will use the pdca channel 0. There is 17 possible pdca channel in AT32UC3A0512.

Referenced by init_pdca(), main(), and pdca_interrupt_handler().

A_ALIGNED short predicted_value

Predicted value for the adpcm decoder.

Referenced by dsp_adpcm_ima_decode(), dsp_adpcm_ima_encode(), main(), and set_new_dac_buffer().

A_ALIGNED short step_index

Step index for the adpcm decoder.

Referenced by dsp16_gen_step(), dsp32_gen_step(), dsp_adpcm_ima_decode(), dsp_adpcm_ima_encode(), main(), and set_new_dac_buffer().

Microchip® Advanced Software Framework

Macros

Functions

Variables