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OV7740 image sensor capture example.

Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.

#include "asf.h"
#include "conf_board.h"
#include "conf_clock.h"

Macros
#define	_display() draw_frame_yuv_color_int()

#define	DEFAULT_MODE_COLORED

#define	PIO_PCMR_DSIZE_WORD PIO_PCMR_DSIZE(2)

#define	TWI_CLK (400000UL)

Functions
static void	board_configure_sram (void)
	Configure SMC interface for SRAM. More...

static void	button_handler (uint32_t ul_id, uint32_t ul_mask)
	Handler for button rising edge interrupt. More...

static void	capture_init (void)
	Initialize PIO capture and the OV7740 image sensor. More...

static uint8_t	clip32_to_8 (int32_t i)
	Take a 32 bit variable in parameters and returns a value between 0 and 255. More...

static void	configure_button (void)
	Configure push button and initialize button_handler interrupt. More...

static void	display_init (void)
	Intialize LCD display. More...

static void	draw_frame_yuv_color_int (void)
	Draw LCD in color with integral algorithm. More...

static void	init_vsync_interrupts (void)
	Intialize Vsync_Handler. More...

int	main (void)
	Application entry point for image sensor capture example. More...

static void	pio_capture_init (Pio *p_pio, uint32_t ul_id)
	Initialize PIO capture for the OV7740 image sensor communication. More...

static uint8_t	pio_capture_to_buffer (Pio p_pio, uint8_t uc_buf, uint32_t ul_size)
	Capture OV7740 data to a buffer. More...

static void	start_capture (void)
	Start picture capture. More...

static void	vsync_handler (uint32_t ul_id, uint32_t ul_mask)
	Handler for vertical synchronisation using by the OV7740 image sensor. More...

Variables
uint8_t *	g_p_uc_cap_dest_buf

static volatile uint32_t	g_ul_push_button_trigger = false

static volatile uint32_t	g_ul_vsync_flag = false

uint16_t	g_us_cap_line = (IMAGE_WIDTH * 2)

uint16_t	g_us_cap_rows = IMAGE_HEIGHT

#define _display ( ) draw_frame_yuv_color_int()

Referenced by main().

#define DEFAULT_MODE_COLORED

#define PIO_PCMR_DSIZE_WORD PIO_PCMR_DSIZE(2)

Referenced by pio_capture_init().

#define TWI_CLK (400000UL)

Referenced by capture_init().

static void board_configure_sram ( void )

static

Configure SMC interface for SRAM.

References pmc_enable_periph_clk(), smc_set_cycle_timing(), smc_set_mode(), smc_set_pulse_timing(), and smc_set_setup_timing().

Referenced by main().

static void button_handler	(	uint32_t	ul_id,
		uint32_t	ul_mask
	)

static

Handler for button rising edge interrupt.

References g_ul_push_button_trigger, and unused.

Referenced by configure_button().

static void capture_init ( void )

static

Initialize PIO capture and the OV7740 image sensor.

References delay_ms, init_vsync_interrupts(), twi_options::master_clk, ov_configure(), ov_init(), ov_power(), pio_capture_init(), pmc_enable_periph_clk(), PMC_PCK_PRES_CLK_4, QVGA_YUV422_20FPS, twi_options::speed, sysclk_get_cpu_hz(), TWI_CLK, and twi_master_init().

Referenced by main().

static uint8_t clip32_to_8 ( int32_t i )

inlinestatic

Take a 32 bit variable in parameters and returns a value between 0 and 255.

Parameters

i	Enter value .

Returns: i if 0<i<255, 0 if i<0 and 255 if i>255

Referenced by draw_frame_yuv_color_int().

static void configure_button ( void )

static

Configure push button and initialize button_handler interrupt.

References button_handler(), pio_enable_interrupt(), pio_set_debounce_filter(), and pmc_enable_periph_clk().

Referenced by main().

static void display_init ( void )

static

static void draw_frame_yuv_color_int ( void )

static

Draw LCD in color with integral algorithm.

References clip32_to_8(), g_p_uc_cap_dest_buf, ili9325_draw_prepare(), ILI9325_ENTRY_MODE, ILI9325_ENTRY_MODE_AM, ILI9325_ENTRY_MODE_BGR, ILI9325_ENTRY_MODE_DFM, ILI9325_ENTRY_MODE_ORG, and ILI9325_ENTRY_MODE_TRI.

static void init_vsync_interrupts ( void )

static

Intialize Vsync_Handler.

References vsync_handler().

Referenced by capture_init().

int main ( void )

Application entry point for image sensor capture example.

Returns: Unused (ANSI-C compatibility).

References _display, board_configure_sram(), board_init(), capture_init(), COLOR_TURQUOISE, configure_button(), display_init(), g_ul_push_button_trigger, ili9325_draw_string(), ili9325_fill(), pmc_enable_pllack(), start_capture(), and sysclk_init().

static void pio_capture_init	(	Pio *	p_pio,
		uint32_t	ul_id
	)

static

Initialize PIO capture for the OV7740 image sensor communication.

Parameters

p_pio	PIO instance to be configured in PIO capture mode.
ul_id	Corresponding PIO ID.

References PIO_PCMR_DSIZE_WORD, and pmc_enable_periph_clk().

Referenced by capture_init().

static uint8_t pio_capture_to_buffer	(	Pio *	p_pio,
		uint8_t *	uc_buf,
		uint32_t	ul_size
	)

static

Capture OV7740 data to a buffer.

Parameters

p_pio	PIO instance which will capture data from OV7740 iamge sensor.
p_uc_buf	Buffer address where captured data must be stored.
ul_size	Data frame size.

Referenced by start_capture().

static void start_capture ( void )

static

Start picture capture.

References g_p_uc_cap_dest_buf, g_ul_vsync_flag, g_us_cap_line, g_us_cap_rows, pio_capture_to_buffer(), pio_disable_interrupt(), and pio_enable_interrupt().

Referenced by main().

static void vsync_handler	(	uint32_t	ul_id,
		uint32_t	ul_mask
	)

static

Handler for vertical synchronisation using by the OV7740 image sensor.

References g_ul_vsync_flag, and unused.

Referenced by init_vsync_interrupts().

uint8_t* g_p_uc_cap_dest_buf

Referenced by draw_frame_yuv_color_int(), and start_capture().

volatile uint32_t g_ul_push_button_trigger = false

static

Referenced by button_handler(), and main().

volatile uint32_t g_ul_vsync_flag = false

static

Referenced by start_capture(), and vsync_handler().

uint16_t g_us_cap_line = (IMAGE_WIDTH * 2)

Referenced by start_capture().

uint16_t g_us_cap_rows = IMAGE_HEIGHT

Referenced by start_capture().