widget_scr_fft.c File Reference

FFT example for SAM toolkit demo application.

Copyright (c) 2012-2018 Microchip Technology Inc. and its subsidiaries.

#include <board.h>
#include <sysclk.h>
#include <asf.h>
#include "arm_math.h"
#include "demo.h"
#include "pdc.h"

Macros
#define	ADC_CH   ADC_CHANNEL_4 /* sam4: MIC */
#define	BGCOLOR   GFX_COLOR_WHITE
#define	DRAW_H   90
#define	DRAW_W   200
#define	OFFSET_X   10
#define	OFFSET_Y   40
#define	Q15_A   (1)
#define	Q15_B   (15)
#define	Q15_DATA_MASK   (0x7fff)
#define	Q15_MAX   (0.99997)
#define	Q15_MIN   (-1.0)
#define	Q15_SIG_MASK   (0x8000)
#define	SIGNAL_VAL_MAX   0xFFF
#define	TRIGGER_TC   TC0
#define	TRIGGER_TC_CH   0
#define	TRIGGER_TC_ID   ID_TC0
#define	WORD_LENGTH   (16)

Functions
static void	adc_input_init (void)
	Initialize ADC input. More...
void	app_widget_fft_on (void)
	Turn on FFT example. More...
static void	fft_process (q15_t *buffer, uint32_t fft_size)
	Process FFT. More...
static void	gain_q15_buffer (q15_t *buffer, uint32_t size)
	Gain q15 data buffer. More...
static uint32_t	get_available_nb_sample (uint32_t i_index, uint32_t o_index)
	Get available number of sample data. More...
static void	gui_print_q15_bar (q15_t *signal, uint16_t signal_size, gfx_coord_t x, gfx_coord_t y, uint16_t w, uint16_t h, gfx_color_t fg_color, gfx_color_t bg_color)
	Display 1.15 format data with bar. More...
static void	gui_print_q15_signal (q15_t *signal, uint16_t signal_size, gfx_coord_t x, gfx_coord_t y, uint16_t w, uint16_t h, gfx_color_t fg_color, gfx_color_t bg_color)
	Display 1.15 format data with signal. More...
static void	tc_trigger_init (void)
	Initialize TC trigger. More...
static void	u16_to_q15 (uint16_t *p_u16, q15_t *p_q15, uint32_t size, uint16_t u16_max, uint16_t u16_min, bool b_centerize)
	Convert unsigned short to 1.15 format. More...

Variables
uint8_t	adc_buf_ndx = 0
uint32_t	adc_nb_samples = 0
pdc_packet_t	adc_nextpacket
pdc_packet_t	adc_packet
	PDC data packet. More...
uint32_t	fft_delay
	FFT delay counter. More...
bool	fft_update
	FFT update flag. More...
uint16_t	frame_buffer [AUDIO_NB_BUFFER][AUDIO_FRAME_SIZE]
uint16_t *	p_proc_src = frame_buffer[0]
uint16_t	proc_buffer [NB_VAL *2]
uint32_t	proc_ndx = 0
uint32_t	tc_ch_rc

#define ADC_CH   ADC_CHANNEL_4 /* sam4: MIC */

Referenced by adc_input_init().

#define BGCOLOR   GFX_COLOR_WHITE

Referenced by app_widget_fft_on().

#define DRAW_H   90

Referenced by app_widget_fft_on().

#define DRAW_W   200

Referenced by app_widget_fft_on().

#define OFFSET_X   10

Referenced by app_widget_fft_on().

#define OFFSET_Y   40

Referenced by app_widget_fft_on().

#define Q15_A   (1)

#define Q15_B   (15)

Referenced by gui_print_q15_bar(), and gui_print_q15_signal().

#define Q15_DATA_MASK   (0x7fff)

Referenced by gain_q15_buffer().

#define Q15_MAX   (0.99997)

#define Q15_MIN   (-1.0)

Referenced by gui_print_q15_bar(), and gui_print_q15_signal().

#define Q15_SIG_MASK   (0x8000)

Referenced by fft_process(), gain_q15_buffer(), and u16_to_q15().

#define SIGNAL_VAL_MAX   0xFFF

Referenced by app_widget_fft_on().

#define TRIGGER_TC   TC0

Referenced by app_widget_fft_on(), and tc_trigger_init().

#define TRIGGER_TC_CH   0

Referenced by app_widget_fft_on(), and tc_trigger_init().

#define TRIGGER_TC_ID   ID_TC0

Referenced by tc_trigger_init().

#define WORD_LENGTH   (16)

Referenced by gui_print_q15_bar(), and gui_print_q15_signal().

static void adc_input_init ( void  )

static

Initialize ADC input.

References ADC_CH, adc_enable_channel(), adc_enable_interrupt(), adc_get_pdc_base(), ADC_TRIG_TIO_CH_0, AUDIO_FRAME_SIZE, AUDIO_SAMPLE_RATE, frame_buffer, pdc_enable_transfer(), pdc_rx_init(), pmc_enable_periph_clk(), sysclk_get_cpu_hz(), pdc_packet::ul_addr, and pdc_packet::ul_size.

Referenced by app_widget_fft_on().

void app_widget_fft_on

(

void

)

Turn on FFT example.

References adc_buf_ndx, adc_input_init(), adc_nb_samples, AUDIO_BUFFER_SIZE, AUDIO_FRAME_SIZE, AUDIO_SAMPLE_RATE, BGCOLOR, DEMO_FFT_MODE, demo_get_special_mode_status(), DRAW_H, DRAW_W, fft_delay, fft_process(), gain_q15_buffer(), get_available_nb_sample(), GFX_COLOR_BLACK, GFX_COLOR_BLUE, GFX_COLOR_WHITE, gfx_draw_filled_rect, gfx_draw_string_aligned(), gfx_get_height(), gfx_get_width(), gui_print_q15_bar(), gui_print_q15_signal(), MAX_FFT_DISP_FREQ, NB_VAL, OFFSET_X, OFFSET_Y, p_proc_src, proc_buffer, proc_ndx, SIGNAL_VAL_MAX, sysclk_get_cpu_hz(), sysfont, SYSTICK_FREQ, tc_ch_rc, tc_trigger_init(), tc_write_ra(), tc_write_rc(), TEXT_ALIGN_LEFT, TEXT_POS_CENTER, TRIGGER_TC, TRIGGER_TC_CH, and u16_to_q15().

Referenced by widget_frame_command_handler().

static void fft_process ( q15_t *  buffer, uint32_t  fft_size  )

static

Process FFT.

Parameters

buffer	Pointer to the data buffer.
fft_size	Size to process.

References FFT_OUT_GAIN, and Q15_SIG_MASK.

Referenced by app_widget_fft_on().

static void gain_q15_buffer ( q15_t *  buffer, uint32_t  size  )

static

Gain q15 data buffer.

References FFT_IN_GAIN, Q15_DATA_MASK, Q15_SIG_MASK, and win_area::size.

Referenced by app_widget_fft_on().

static uint32_t get_available_nb_sample ( uint32_t  i_index, uint32_t  o_index  )

static

Get available number of sample data.

References AUDIO_BUFFER_SIZE.

Referenced by app_widget_fft_on().

static void gui_print_q15_bar ( q15_t *  signal, uint16_t  signal_size, gfx_coord_t  x, gfx_coord_t  y, uint16_t  w, uint16_t  h, gfx_color_t  fg_color, gfx_color_t  bg_color  )

static

Display 1.15 format data with bar.

Parameters

signal	Signal value.
signal_size	Signal size.
x	Position X.
y	Position Y.
w	Width.
h	Height.
fg_color	foreground color.
bg_color	background color.

References gfx_draw_filled_rect, gfx_draw_line, gfx_draw_pixel(), Q15_B, Q15_MIN, and WORD_LENGTH.

Referenced by app_widget_fft_on().

static void gui_print_q15_signal ( q15_t *  signal, uint16_t  signal_size, gfx_coord_t  x, gfx_coord_t  y, uint16_t  w, uint16_t  h, gfx_color_t  fg_color, gfx_color_t  bg_color  )

static

Display 1.15 format data with signal.

Parameters

signal	Signal value.
signal_size	Signal size.
x	Position X.
y	Position Y.
w	Width.
h	Height.
fg_color	foreground color.
bg_color	background color.

Returns

True if exiting, to destroy the window

References Abs, gfx_draw_filled_rect, gfx_draw_line, Min, Q15_B, Q15_MIN, and WORD_LENGTH.

Referenced by app_widget_fft_on().

static void tc_trigger_init ( void  )

static

Initialize TC trigger.

References AUDIO_SAMPLE_RATE, pmc_enable_periph_clk(), sysclk_get_cpu_hz(), tc_ch_rc, tc_find_mck_divisor(), tc_init(), tc_start(), tc_write_ra(), tc_write_rc(), TRIGGER_TC, TRIGGER_TC_CH, and TRIGGER_TC_ID.

Referenced by app_widget_fft_on().

static void u16_to_q15 ( uint16_t *  p_u16, q15_t *  p_q15, uint32_t  size, uint16_t  u16_max, uint16_t  u16_min, bool  b_centerize  )

static

Convert unsigned short to 1.15 format.

Parameters

p_u16	Unsigned short value.
p_q15	Pointer to the converted data.
size	data size.
u16_max	Maximum unsigned short value.
u16_min	Minimum unsigned short value.
b_centerize	Is centerized.

References Q15_SIG_MASK, and win_area::size.

Referenced by app_widget_fft_on().

uint8_t adc_buf_ndx = 0

Referenced by ADC_Handler(), and app_widget_fft_on().

uint32_t adc_nb_samples = 0

Referenced by ADC_Handler(), and app_widget_fft_on().

pdc_packet_t adc_nextpacket

pdc_packet_t adc_packet

PDC data packet.

uint32_t fft_delay

FFT delay counter.

Referenced by app_widget_fft_on(), and SysTick_Handler().

bool fft_update

FFT update flag.

Referenced by SysTick_Handler().

uint16_t frame_buffer[AUDIO_NB_BUFFER][AUDIO_FRAME_SIZE]

Referenced by ADC_Handler(), adc_input_init(), enter_wifi_firmware_download(), and serial_bridge_process_frame().

uint16_t* p_proc_src = frame_buffer[0]

Referenced by app_widget_fft_on().

uint16_t proc_buffer[NB_VAL *2]

Referenced by app_widget_fft_on().

uint32_t proc_ndx = 0

Referenced by app_widget_fft_on().

uint32_t tc_ch_rc

Referenced by app_widget_fft_on(), and tc_trigger_init().