DSP task for the FreeRTOS Web/DSP Demo.

#include "task_demo.h"
#include "arm_math.h"
#include "sound.h"
#include "pdc.h"
#include "afec.h"
#include "tc.h"
#include "dacc.h"
#include "conf_uart_serial.h"
#include "pio.h"
#include "pio_handler.h"
#include <stdio_serial.h>
#include <serial.h>

Macros
#define	ADC_CHANNEL_MICROPHONE AFEC_CHANNEL_4

#define	ADC_CHANNEL_POTENTIOMETER AFEC_CHANNEL_5
	ADC definitions. More...

#define	ADC_POTENTIOMETER_NOISE 10

#define	DACC_REFRESH 1

#define	INT_PRI_PUSHBUTTON (configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY + 2)

#define	INT_PRIORITY_DACC configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY
	Interrupt priorities. More...

#define	IRQ_PRIOR_PIO 5
	IRQ priority for PIO (The lower the value, the greater the priority). More...

#define	SAMPLE_BLOCK_SIZE 256UL
	Numbers Definitions related to the FFT calculation. More...

#define	SAMPLING_FREQUENCY 22050UL
	Sound sampling frequency. More...

#define	SPEAKER_CHANNEL_L DACC_MR_USER_SEL_CHANNEL1

#define	SPEAKER_CHANNEL_R DACC_MR_USER_SEL_CHANNEL0
	DACC related definitions. More...

#define	TC_RA (TC_RC / 2)

#define	TC_RC (BOARD_MCK / 2 / SAMPLING_FREQUENCY)
	TC related definitions. More...

#define	VOICE_CHANGER_DELTA 100UL
	Voice changer step in hertz. More...

#define	WAVE_OFFSET (44 + 4)
	Wave file offset in bytes. More...

Functions
void	create_dsp_task (uint16_t stack_depth_words, unsigned portBASE_TYPE task_priority)
	Create the DSP task. More...

void	DACC_Handler (void)
	DACC interrupt handler. More...

static void	dsp_clean_buffer (uint16_t *buffer, uint32_t size)
	Clean the specified sound buffer with the 8 bits mediane value. More...

static void	dsp_configure_adc (void)
	AFEC(ADC) configuration. More...

static void	dsp_configure_button2 (void)
	Configure the push button 1. More...

static void	dsp_configure_dacc (void)
	DACC configuration. More...

static void	dsp_configure_tc (void)
	TC configuration. More...

static void	dsp_event_button2 (uint32_t id, uint32_t mask)
	Handler for Button 1 rising edge interrupt. More...

static void	dsp_sin_init (void)
	Generate sinusoidale signals for voice changing. More...

static void	dsp_sin_input (float32_t freq)
	Generate a sinus input signal. More...

static void	dsp_task (void *pvParameters)
	DSP task core function. More...

Variables
static uint32_t	adc_potentiometer_old = 0
	Backup previous adc potentiometer value. More...

static q15_t	cfft_q15 [SAMPLE_BLOCK_SIZE *2]
	q15 cFFT buffer declaration More...

static uint32_t	cur_dac_buffer = 2
	Pointer to current PDC buffer in use. More...

xSemaphoreHandle	dacc_notification_semaphore = NULL
	Notification semaphores. More...

static uint16_t	dacc_out_buffer [3][SAMPLE_BLOCK_SIZE]
	Output buffer for DACC. More...

Pdc *	dacc_pdc
	Pointer to PDC register base. More...

uint32_t	g_mode_select = 1
	Wave/Sinus mode selection. More...

pdc_packet_t	g_pdc_nextpacket

pdc_packet_t	g_pdc_packet
	PDC data packet. More...

xSemaphoreHandle	gfx_notification_semaphore = NULL
	GFX notification semaphore. More...

static portBASE_TYPE	higher_priority_task_woken = pdFALSE

float32_t	mag_in_buffer [SAMPLE_BLOCK_SIZE]
	Magnitude buffer converted in float. More...

uint32_t	mag_in_buffer_int [SAMPLE_BLOCK_SIZE]
	Magnitude buffer converted in float. More...

static q15_t	mag_in_buffer_q15 [SAMPLE_BLOCK_SIZE]
	q15 Magnitude buffer declaration More...

static const portTickType	max_block_time_ticks = 200UL / portTICK_RATE_MS

uint32_t	offset = WAVE_OFFSET
	Pointer to the wave file. More...

static float32_t	sin_buffer [SLIDER_SELECTOR_NB][SAMPLE_BLOCK_SIZE]
	Generated sinus signal for voice modulation. More...

uint8_t	slider_pos
	Slider position, used as sin_buffer table index. More...

float32_t	wav_in_buffer [SAMPLE_BLOCK_SIZE *2]
	Wave input buffer defined in DSP task. More...

#define ADC_CHANNEL_MICROPHONE AFEC_CHANNEL_4

Referenced by dsp_configure_adc().

#define ADC_CHANNEL_POTENTIOMETER AFEC_CHANNEL_5

ADC definitions.

Referenced by dsp_configure_adc(), and dsp_task().

#define ADC_POTENTIOMETER_NOISE 10

Referenced by dsp_task().

#define DACC_REFRESH 1

#define INT_PRI_PUSHBUTTON (configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY + 2)

Referenced by dsp_configure_button2().

#define INT_PRIORITY_DACC configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY

Interrupt priorities.

(lowest value = highest priority) ISRs using FreeRTOS *FromISR APIs must have priorities below or equal to configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY.

Referenced by dsp_configure_dacc().

#define IRQ_PRIOR_PIO 5

IRQ priority for PIO (The lower the value, the greater the priority).

#define SAMPLE_BLOCK_SIZE 256UL

Numbers Definitions related to the FFT calculation.

Referenced by DACC_Handler(), dsp_sin_init(), dsp_sin_input(), and dsp_task().

#define SAMPLING_FREQUENCY 22050UL

Sound sampling frequency.

Referenced by dsp_sin_init(), and dsp_sin_input().

#define SPEAKER_CHANNEL_L DACC_MR_USER_SEL_CHANNEL1

Referenced by dsp_configure_dacc().

#define SPEAKER_CHANNEL_R DACC_MR_USER_SEL_CHANNEL0

DACC related definitions.

Referenced by dsp_configure_dacc().

#define TC_RA (TC_RC / 2)

Referenced by dsp_configure_tc(), and tc_qdec_getresult().

#define TC_RC (BOARD_MCK / 2 / SAMPLING_FREQUENCY)

TC related definitions.

Referenced by dsp_configure_tc().

#define VOICE_CHANGER_DELTA 100UL

Voice changer step in hertz.

Referenced by dsp_sin_init().

#define WAVE_OFFSET (44 + 4)

Wave file offset in bytes.

Referenced by dsp_task().

void create_dsp_task	(	uint16_t	stack_depth_words,
		unsigned portBASE_TYPE	task_priority
	)

Create the DSP task.

Parameters

stack_depth_words	Task stack size in 32 bits word.
task_priority	Task priority.

References dsp_task(), NULL, vSemaphoreCreateBinary, xSemaphoreTake, and xTaskCreate.

Referenced by main().

void DACC_Handler ( void )

DACC interrupt handler.

Check if one PDC buffer has been received.

Add cur_dac_buffer as next transfert for PDC.

Notify DSP task to start data processing.

Use next PDC buffer for ADC and DACC.

References cur_dac_buffer, dacc_get_interrupt_status(), dacc_out_buffer, dacc_pdc, higher_priority_task_woken, NULL, pdc_tx_init(), SAMPLE_BLOCK_SIZE, pdc_packet::ul_addr, pdc_packet::ul_size, and xSemaphoreGiveFromISR.

static void dsp_clean_buffer	(	uint16_t *	buffer,
		uint32_t	size
	)

static

Clean the specified sound buffer with the 8 bits mediane value.

Parameters

buffer	Buffer to clean..
size	Buffer size.

Referenced by dsp_task().

static void dsp_configure_adc ( void )

static

AFEC(ADC) configuration.

References ADC_CHANNEL_MICROPHONE, ADC_CHANNEL_POTENTIOMETER, afec_ch_get_config_defaults(), afec_ch_set_config(), afec_channel_disable(), afec_channel_enable(), afec_channel_set_analog_offset(), afec_enable(), afec_get_config_defaults(), afec_get_interrupt_status(), afec_init(), afec_set_trigger(), afec_start_software_conversion(), afec_temp_sensor_get_config_defaults(), afec_temp_sensor_set_config(), AFEC_TRIG_SW, pmc_enable_periph_clk(), and afec_temp_sensor_config::rctc.

Referenced by dsp_task().

static void dsp_configure_button2 ( void )

static

Configure the push button 1.

Note: Configure the PIO as input and generate corresponding interrupt when pressed or released.

References dsp_event_button2(), INT_PRI_PUSHBUTTON, pio_enable_interrupt(), pio_set_debounce_filter(), and pmc_enable_periph_clk().

Referenced by dsp_task().

static void dsp_configure_dacc ( void )

static

DACC configuration.

References dacc_enable_channel(), dacc_enable_flexible_selection(), dacc_enable_interrupt(), dacc_get_pdc_base(), dacc_pdc, dacc_set_channel_selection(), dacc_set_power_save(), dacc_set_timing(), dacc_set_transfer_mode(), dacc_set_trigger(), INT_PRIORITY_DACC, pmc_enable_periph_clk(), SPEAKER_CHANNEL_L, and SPEAKER_CHANNEL_R.

Referenced by dsp_task().

static void dsp_configure_tc ( void )

static

TC configuration.

References pmc_enable_periph_clk(), tc_init(), TC_RA, TC_RC, tc_write_ra(), and tc_write_rc().

Referenced by dsp_task().

static void dsp_event_button2	(	uint32_t	id,
		uint32_t	mask
	)

static

Handler for Button 1 rising edge interrupt.

Parameters

id	The pressed button ID.
mask	Button mask.

References g_mode_select.

Referenced by dsp_configure_button2().

static void dsp_sin_init ( void )

static

Generate sinusoidale signals for voice changing.

References SAMPLE_BLOCK_SIZE, SAMPLING_FREQUENCY, sin_buffer, SLIDER_SELECTOR_NB, and VOICE_CHANGER_DELTA.

Referenced by dsp_task().

static void dsp_sin_input ( float32_t freq )

static

Generate a sinus input signal.

Parameters

freq	Sinus frequency.

References SAMPLE_BLOCK_SIZE, SAMPLING_FREQUENCY, and wav_in_buffer.

Referenced by dsp_task().

static void dsp_task ( void * pvParameters )

static

DSP task core function.

Parameters

pvParameters Junk parameter.

DSP task loop.

cFFT configuration instance declaration

References ADC_CHANNEL_POTENTIOMETER, ADC_POTENTIOMETER_NOISE, adc_potentiometer_old, afec_channel_get_value(), afec_start_software_conversion(), cfft_q15, cur_dac_buffer, dacc_out_buffer, dacc_pdc, dsp_clean_buffer(), dsp_configure_adc(), dsp_configure_button2(), dsp_configure_dacc(), dsp_configure_tc(), dsp_sfx, dsp_sfx_size, dsp_sin_init(), dsp_sin_input(), g_mode_select, mag_in_buffer, mag_in_buffer_int, mag_in_buffer_q15, max_block_time_ticks, offset, pdc_enable_transfer(), pdc_tx_init(), SAMPLE_BLOCK_SIZE, sin_buffer, slider_pos, tc_start(), pdc_packet::ul_addr, pdc_packet::ul_size, UNUSED, WAIT_FOR_TOUCH_EVENT, wav_in_buffer, WAVE_OFFSET, xSemaphoreGive, and xSemaphoreTake.

Referenced by create_dsp_task().

uint32_t adc_potentiometer_old = 0

static

Backup previous adc potentiometer value.

Referenced by dsp_task().

q15_t cfft_q15[SAMPLE_BLOCK_SIZE *2]

static

q15 cFFT buffer declaration

Referenced by dsp_task().

uint32_t cur_dac_buffer = 2

static

Pointer to current PDC buffer in use.

Referenced by DACC_Handler(), and dsp_task().

xSemaphoreHandle dacc_notification_semaphore = NULL

Notification semaphores.

uint16_t dacc_out_buffer[3][SAMPLE_BLOCK_SIZE]

static

Output buffer for DACC.

Referenced by DACC_Handler(), and dsp_task().

Pdc* dacc_pdc

Pointer to PDC register base.

Referenced by DACC_Handler(), dsp_configure_dacc(), and dsp_task().

uint32_t g_mode_select = 1

Wave/Sinus mode selection.

Referenced by dsp_event_button2(), and dsp_task().

pdc_packet_t g_pdc_nextpacket

pdc_packet_t g_pdc_packet

PDC data packet.

xSemaphoreHandle gfx_notification_semaphore = NULL

GFX notification semaphore.

Triggered from DSP task.

portBASE_TYPE higher_priority_task_woken = pdFALSE

static

Referenced by DACC_Handler().

float32_t mag_in_buffer[SAMPLE_BLOCK_SIZE]

Magnitude buffer converted in float.

Magnitude input buffer defined in DSP task.

Referenced by dsp_task().

uint32_t mag_in_buffer_int[SAMPLE_BLOCK_SIZE]

Magnitude buffer converted in float.

Referenced by cgi_status(), dsp_task(), and gfx_refresh_mag().

q15_t mag_in_buffer_q15[SAMPLE_BLOCK_SIZE]

static

q15 Magnitude buffer declaration

Referenced by dsp_task().

const portTickType max_block_time_ticks = 200UL / portTICK_RATE_MS

static

Referenced by dsp_task().

uint32_t offset = WAVE_OFFSET

Pointer to the wave file.

Referenced by dsp_task(), gfx_draw_bmpfile(), hx8347a_draw_char(), ili9325_draw_char(), ili93xx_draw_char(), nand_flash_spare_scheme_read_extra(), nand_flash_spare_scheme_write_extra(), pbuf_alloc(), pbuf_copy_partial(), pbuf_get_at(), pbuf_memcmp(), and tx_done_handling().

float32_t sin_buffer[SLIDER_SELECTOR_NB][SAMPLE_BLOCK_SIZE]

static

Generated sinus signal for voice modulation.

Referenced by dsp_sin_init(), and dsp_task().

uint8_t slider_pos

Slider position, used as sin_buffer table index.

Referenced by demo_process_qt_status(), and dsp_task().

float32_t wav_in_buffer[SAMPLE_BLOCK_SIZE *2]

Wave input buffer defined in DSP task.

Referenced by dsp_sin_input(), dsp_task(), and gfx_refresh_wav().

Microchip® Advanced Software Framework

Macros

Functions

Variables