PIO + DMA frame capture engine. 更多...

#include <stddef.h>
#include <stdint.h>

pio_capture.h 的引用(Include)关系图:

结构体
struct	pio_capture_pins_t

函数
int	pio_capture_init (const pio_capture_pins_t *pins)
	Claim a PIO state machine and DMA channel, load the capture program.
void	pio_capture_deinit (void)
int	pio_capture_frame (uint8_t *buf, size_t len, uint32_t timeout_ms)
	Capture exactly len bytes (one frame) into buf, blocking.
int	pio_capture_frame_variable (uint8_t buf, size_t capacity, size_t out_len, uint32_t timeout_ms)
	Capture one variable-length frame (JPEG) into buf.

详细描述

PIO + DMA frame capture engine.

The PIO program is assembled at runtime with pio_encode_*(), so all pins come from camera_config_t - there is no .pio file and no pioasm build step (which also keeps the library Arduino-IDE friendly).

函数说明

◆ pio_capture_deinit()

void pio_capture_deinit ( void )

Release PIO state machine and DMA channel.

◆ pio_capture_frame()

int pio_capture_frame	(	uint8_t *	buf,
		size_t	len,
		uint32_t	timeout_ms )

Capture exactly len bytes (one frame) into buf, blocking.

Waits for the next VSYNC rising edge, then captures while HREF is high, clocked by PCLK, until len bytes are in the buffer.

参数

timeout_ms abort and return PICO timeout error after this long

返回: 0 on success, negative on timeout/error

◆ pio_capture_frame_variable()

int pio_capture_frame_variable	(	uint8_t *	buf,
		size_t	capacity,
		size_t *	out_len,
		uint32_t	timeout_ms )

Capture one variable-length frame (JPEG) into buf.

Uses the continuous capture program: streams from a VSYNC rising edge until VSYNC falls again (frame end), then trims the buffer at the JPEG EOI marker (0xFFD9).