ESP32_CAMERA_QR-master_esp32-cam照片_esp_32camera_ESP32-CAMERA__ca

# ESP32 Camera Demo Code provided in this repository gets the image from camera and prints it out as ASCII art to the serial port. ## Function + support OV2640 to output JPEG format . + support OV2640 and OV7725 to output grayscale format. + support QR recognize. + support ESP-IDF V4.0 ## Components To make this code work, you need the following components: * This repository. It contains submodules, so make sure you clone it with `--recursive` option. If you have already cloned it without `--recursive`, run `git submodule update --init`. * [ESP32](https://espressif.com/en/products/hardware/esp32/overview) module * Camera module * PC with [esp-idf](https://github.com/espressif/esp-idf) See the following sections for more details. ### Camera This example has been tested with OV7725 and ov2640 camera modules. Use it, if this is your first exposure to interfacing a microcontroller with a camera. Other OV7xxx series should work as well, with some changes to camera configuration code. OV5xxx can work too, but it is advisable to choose the ones which support RGB or YUV 8-bit wide output bus. The ones which only output 10-bit raw data may be a bit harder to work with. Also choose the camera which can output a scaled down (QVGA or VGA) image. Use of larger frame buffers will require external SPI RAM. ### Ai-Thinker CAM board Ai-Thinker Launch a camera board.This board contain camera interface,TF card and ESP32 with psram.It is very a samll module.The size of the board is 40mm * 26mm * 4mm.You can plug the camera in the board.We will sell this board in our [taobao](https://shop72165205.taobao.com/?spm=a230r.7195193.1997079397.26.Z8Ck3C).    Also,if you have an ESP-WROVER-KIT,you can try this demo. ## Quick Start If you have your components ready, follow this section to [connect](#connect) the camera to ESP32 module, [flash](#flash) application to the ESP32 and finally [shoot](#shoot) and display the image. ## Connect Specific pins used in this example to connect ESP32 and camera are shown in table below. Pinout can be adjusted to some extent in software. Table below provides two options of pin mapping (last two columns). | Interface | Camera Pin | Pin Mapping for ESP32 DevKitJ | Ai-Thinker CAM board | | :--- | :---: | :---: | :---: | | SCCB Clock | SIOC | IO27 | IO27 | | SCCB Data | SIOD | IO26 | IO26 | | System Clock | XCLK | IO21 | IO0 | | Vertical Sync | VSYNC | IO25 | IO25 | | Horizontal Reference | HREF | IO23 | IO23 | | Pixel Clock | PCLK | IO22 | IO22 | | Pixel Data Bit 0 | D2 | IO4 | IO5 | | Pixel Data Bit 1 | D3 | IO5 | IO18 | | Pixel Data Bit 2 | D4 | IO18 | IO19 | | Pixel Data Bit 3 | D5 | IO19 | IO21 | | Pixel Data Bit 4 | D6 | IO36 | IO36 | | Pixel Data Bit 5 | D7 | IO39 | IO39 | | Pixel Data Bit 6 | D8 | IO34 | IO34 | | Pixel Data Bit 7 | D9 | IO35 | IO35 | | Camera Reset | RESET | IO2 | 3.3V | | Camera Power Down | PWDN | *see Note 1* | GND | | Power Supply 3.3V | 3V3 | 3V3 | IO32 | | Ground | GND | GND | GND | Notes: 1. **Camera pin** column refers to pinout on OV7725 camera module 2. **Camera Power Down** pin does not need to be connected to ESP32 GPIO. Instead it may be pulled down to ground with 10 kOhm resistor. ### Flash Clone the code provided in this repository to your PC, compile with the latest [esp-idf](https://github.com/espressif/esp-idf) installed from GitHub and download to the module. If all h/w components are connected properly you are likely to see the following message during download: ``` Krzysztof@tdk-kmb-op780 MSYS /esp/esp32-cam-demo $ make flash Flashing binaries to serial port com18 (app at offset 0x10000)... esptool.py v2.0-dev Connecting... A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header make: *** [C:/msys32/esp-idf/components/esptool_py/Makefile.projbuild:48: flash] Error 2 ``` This is due to a pullup on the camera reset line. It is stronger than the internal pull-down on `GPIO2` of the ESP32, so the chip cannot go into programming mode. There are couple of options how to resolve this issue: * If you are using ESP-WROVER V1 then connect GPIO2 to GND while flashing. * Power down the camera module by removing it from the socket (ESP-WROVER V1) or by uplugging 3.3V wire. * Map Camera Reset line to another GPIO pin on ESP32, for instance `GPIO15`. ### Shoot Once module is loaded with code, open a serial terminal. Camera demo application will first configure XCLK output that is timing operation of the camera chip. If you set the pin of the xclk as GPIO0,the clock will be output by I2S1.The wave of clock is the best. ``` I (71) I2S: DMA Malloc info, datalen=blocksize=256, dma_buf_count=8 I (71) I2S: PLL_D2: Req RATE: 78125, real rate: 78125.000, BITS: 16, CLKM: 8, BCK: 8, MCLK: 20000000.000, SCLK: 2500000.000000, diva: 64, divb: 0 I (81) camera_xclk: PIN_CTRL before:3ff I (81) camera_xclk: PIN_CTRL after:7fff ``` If you set the pin of the xclk as other GPIO,the clock will be output by ledc. ``` D (1527) camera: Enabling XCLK output I (1527) ledc: LEDC_PWM CHANNEL 0|GPIO 21|Duty 0004|Time 0 ``` This clock is also timing output of pixel data on camera output interface - see I2S and DMA described below. Then [SCCB](http://www.ovt.com/download_document.php?type=document&DID=63) interface is set up: ``` D (1527) camera: Initializing SSCB I (1537) gpio: GPIO[26]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 I (1537) gpio: GPIO[27]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 I (1547) gpio: GPIO[26]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 I (1557) gpio: GPIO[27]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 ``` In next step the communication with camera should be established. ESP will retrieve camera's address and signature. ``` D (1567) camera: Resetting camera D (1587) camera: Searching for camera address D (1587) camera: Detected camera at address=0x21 D (1587) camera: Camera PID=0x77 VER=0x21 MIDL=0x7f MIDH=0xa2 ``` If communication fails, the following message is shown: ``` E (1076) camera: Camera address not found E (1076) camera_demo: Camera init failed with error = 131073 ``` If communication with camera module is established, ESP will reset the camera sensor and reserve memory for video frame buffer: ``` D (1587) camera: Doing SW reset of sensor D (1647) camera: Setting frame size at 320x240 D (1677) camera: Allocating frame buffer (320x240, 76800 bytes) ``` Image from camera is retrieved using I2S communication for all eight pixel bits at once and saved in memory line by line. Log below shows completion of initialization steps for I2S and DMA: ``` D (1677) camera: Initializing I2S and DMA I (1677) gpio: GPIO[35]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 I (1677) gpio: GPIO[34]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 I (1687) gpio: GPIO[39]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 I (1697) gpio: GPIO[36]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 I (1707) gpio: GPIO[19]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 I (1717) gpio: GPIO[18]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 I (1727) gpio: GPIO[5]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 I (1737) gpio: GPIO[4]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 I (1747) gpio: GPIO[25]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 I (1757) gpio: GPIO[23]| InputEn: 1| OutputEn: 0| OpenDrain: 0|