pico_camera.h

浏览该文件的文档.

/*
 * This file is part of the PicoCamera project.
 * https://github.com/umeiko/PicoCamera
 *
 * Author: umeko <umeko@stu.xmu.edu.cn>
 * License: MIT
 */

#pragma once
 
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include <sys/time.h>
 
#include "sensor.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef int pico_camera_err_t;
 
#define PICO_CAMERA_OK                            0
#define PICO_CAMERA_FAIL                          -1
#define PICO_CAMERA_ERR_NO_MEM                    -2
#define PICO_CAMERA_ERR_INVALID_ARG               -3
#define PICO_CAMERA_ERR_INVALID_STATE             -4
#define PICO_CAMERA_ERR_NOT_SUPPORTED             -5
#define PICO_CAMERA_ERR_TIMEOUT                   -6
#define PICO_CAMERA_ERR_BASE                      (-100)
#define PICO_CAMERA_ERR_NOT_DETECTED              (PICO_CAMERA_ERR_BASE - 1)
#define PICO_CAMERA_ERR_FAILED_TO_SET_FRAME_SIZE  (PICO_CAMERA_ERR_BASE - 2)
#define PICO_CAMERA_ERR_FAILED_TO_SET_OUT_FORMAT  (PICO_CAMERA_ERR_BASE - 3)

static inline const char *pico_camera_err_str(pico_camera_err_t err) {
    switch (err) {
    case PICO_CAMERA_OK:                           return "OK";
    case PICO_CAMERA_FAIL:                         return "generic failure";
    case PICO_CAMERA_ERR_NO_MEM:                   return "out of memory (frame buffer allocation failed)";
    case PICO_CAMERA_ERR_INVALID_ARG:              return "invalid argument (check pins, pixel_format, frame_size)";
    case PICO_CAMERA_ERR_INVALID_STATE:            return "invalid state (camera already initialized)";
    case PICO_CAMERA_ERR_NOT_SUPPORTED:            return "not supported (e.g. JPEG on a sensor without a JPEG encoder)";
    case PICO_CAMERA_ERR_TIMEOUT:                  return "timeout";
    case PICO_CAMERA_ERR_NOT_DETECTED:             return "no sensor detected on the SCCB bus (check wiring/power)";
    case PICO_CAMERA_ERR_FAILED_TO_SET_FRAME_SIZE: return "failed to set frame size";
    case PICO_CAMERA_ERR_FAILED_TO_SET_OUT_FORMAT: return "failed to set output format";
    default:                                       return "unknown error";
    }
}
 
/* Library version, kept in sync with library.properties / library.json.
 * When a copy installed from the Library Manager overrides a (possibly older)
 * copy bundled with the Arduino core, these macros describe the copy the
 * sketch actually compiled against. */
#define PICO_CAMERA_VERSION_MAJOR   0
#define PICO_CAMERA_VERSION_MINOR   4
#define PICO_CAMERA_VERSION_PATCH   2
#define PICO_CAMERA_VERSION_HEX     ((PICO_CAMERA_VERSION_MAJOR << 16) | \
                                     (PICO_CAMERA_VERSION_MINOR << 8) |  \
                                     PICO_CAMERA_VERSION_PATCH)
#define PICO_CAMERA_VERSION_STRING  "0.4.2"

typedef enum {
    PICO_CAMERA_FB_AUTO = 0,        //< PSRAM when available, SRAM otherwise (default)
    PICO_CAMERA_FB_IN_PSRAM,        //< PSRAM only; init fails if unavailable (esp32-camera parity)
    PICO_CAMERA_FB_IN_SRAM          //< On-chip SRAM only
} camera_fb_location_t;

typedef struct {
    int pin_pwdn;                   //< GPIO for camera power down line (-1 if unused)
    int pin_reset;                  //< GPIO for camera reset line (-1 if unused)
    int pin_xclk;                   //< GPIO for XCLK output
    int pin_sccb_sda;               //< GPIO for SCCB SDA. Hard-muxed: SDA must be an even
    //< GPIO, SCL the matching odd one, both routing to I2C(sccb_i2c_port) —
    //< i.e. (pin / 2) % 2 == sccb_i2c_port (e.g. port 0: SDA on 0/4/8/.../28,
    //< SCL on 1/5/9/.../29). If -1, use the already configured I2C bus by
    //< number (sccb_i2c_port); esp32-camera parity. The bus must be
    //< initialized beforehand (Wire.begin() / Wire1.begin() under Arduino,
    //< i2c_init() under the bare Pico SDK).
    int pin_sccb_scl;               //< GPIO for SCCB SCL (ignored when pin_sccb_sda is -1)
    int pin_d0;                     //< GPIO for data line 0 (lowest of 8 consecutive pins)
    int pin_d1;
    int pin_d2;
    int pin_d3;
    int pin_d4;
    int pin_d5;
    int pin_d6;
    int pin_d7;
    int pin_vsync;                  //< GPIO for VSYNC line
    int pin_href;                   //< GPIO for HREF line
    int pin_pclk;                   //< GPIO for PCLK line
 
    int xclk_freq_hz;               //< XCLK frequency in Hz (0 = default 10 MHz)
 
    int sccb_i2c_port;              //< I2C peripheral: 0 or 1. In shared bus mode
    //< (pin_sccb_sda == -1) this selects which
    //< already-initialized bus to reuse
 
    pixformat_t pixel_format;       //< PIXFORMAT_RGB565, PIXFORMAT_YUV422 or PIXFORMAT_JPEG
    framesize_t frame_size;         //< FRAMESIZE_*
 
    int jpeg_quality;               //< 0-63, lower means higher quality (JPEG only)
    size_t fb_count;                //< Number of frame buffers to allocate
    camera_fb_location_t fb_location; //< Where frame buffers live; PICO_CAMERA_FB_AUTO (0)
    //< keeps old zero-initialized configs working
} camera_config_t;

typedef struct {
    uint8_t *buf;                   //< Pointer to the pixel data
    size_t len;                     //< Length of the used data in bytes
    size_t width;                   //< Width in pixels
    size_t height;                  //< Height in pixels
    pixformat_t format;             //< Format of the pixel data
    struct timeval timestamp;       //< Timestamp since boot of the captured frame
} camera_fb_t;

pico_camera_err_t pico_camera_init(const camera_config_t *config);

pico_camera_err_t pico_camera_deinit(void);

camera_fb_t *pico_camera_fb_get(void);

void pico_camera_fb_return(camera_fb_t *fb);

sensor_t *pico_camera_sensor_get(void);

const camera_sensor_info_t *pico_camera_sensor_info_get(void);
 
#ifdef __cplusplus
}
#endif