SEN-12804

JPEG RS-232 Camera-2M JPEG Compression 2M Camera Module General Description The JPEG compression module performs as a video camera or a JPEG compressed still camera and can be attached to a wireless or PDA host. Users can send out a snapshot command from the host in order to capture a full resolution single-frame still picture. The picture is then compressed by the JPEG engine and transferred to the host. Block Diagram 2M Image Sensor VCC TxD RxD GND Features . Low-cost, & low-powered solution for high resolution image capture .Built-in down-sampling, clamping and windowing circuits for 1600*1200/1280*960/1024*768/800*600/VGA/QVQAF/160x120 image resolutions . RS-232: 1.209600 M bps for transferring JPEG still pictures or VGA preview @8bpp with 0.75~6 fps . JPEG CODEC with variable quality settings for different resolutions System Configuration Camera Sensors DSP Serial Bridge The DSP Serial Bridge is a controller chip that can transfer image data from CameraChips to external device. The camera interface synchronizes with input video data and performs down sampling, clamping and windowing functions with desired resolution, as well as color conversion that is requested by the user through serial bus host commands. The JPEG CODEC with variable quality settings can achieve higher compression ratio & better image quality for various image resolutions. Program Memory A serial type program memory is built-in for JPEG RS-232 Camera, which provides user-friendly commands to interface external control units. Pin Description VCC Power 5VDC TxD Data Transmit RxD Data Receive GND Power Ground Lens : CL4022IR (f3.6mm F/No 2.2) with IR Cut filter General Description: 1. Small in size(32*32MM).low cost and low powered(3.3V or 5.0V). 2. Power on or reset,rs-232 baud rate is 115200. Serial Interface 1. Single Byte Timing Diagram A Single byte RS-232 transmission consists of the start bit,8-bit contents and the stop bit .Astart bit is always 0,while a stop bit is always 1.LSB is sent out first and is right after the start bit. Command Set 1. Reset 56 00 26 00 Receiving ACK command 76 00 26 00 2. Snapshot 56 0036 01 00 Receiving ACK command 76 00 36 00 3 Length of data of the Snapshot Picture 56 00 34 01 00 Receiving ACK command 76 00 34 00 04 00 Byte2 Byte1 Byte0 Byte0 Byte1 is Length of data of the Snapshot Picture Byte2 Length High Byte Byte1 Length Mid Byte Byte0 Length Low Byte 4． Read Data of the Snapshot Picture 56 00 32 0c 00 0a 00 Addr2 Addr1 Addr0 00 Data2 Data1 Data0 00 0a Addr2 Addr1 Addr0 is start Addr of the package Data2 Data1 Data0 is package Size package Size is a multiple of 8 Receiving ACK command 76 00 32 00 00 。 。 。 。 。 。 。 。76 00 32 00 00 5． Snapshot Picture End 56 00 36 01 03 Receiving ACK command 76 00 36 00 00 ⒍ JPEG Resolution The JPEG preview mode can support following image sizes. It is different from normal preview mode. command 1.56 00 54 01 22 160*120 2.56 00 54 01 11 320*240 3.56 00 54 01 00 640*480 returns 76 00 54 00 00 76 00 54 00 00 76 00 54 00 00 4. 56 00 54 01 1D 5. 56 00 54 01 1C 6. 56 00 54 01 1B 7. 56 00 54 01 21 800*600 1024*768 1280*960 1600*1200 76 00 54 00 00 76 00 54 00 00 76 00 54 00 00 76 00 54 00 00 7．Set Baudrate：56 00 24 03 01 XX XX 0XAE 0X2A 0X1C 0X0D 0X7E 0x23 0X56 0x58 0x42 0x9e 0x13 0x87 0x39 0x72 0x92 returns：76 00 24 00 00 Baudrate 9600 38400 57600 115200 128000 230400 256000 460800 512000 576000 600000 691200 921600 1152000 1209600 8. Serial port to manually adjust the exposure control 56 00 46 00 xx XX 00-0xff 9. The serial port to control the IR-CUT command 56 00 aa xx 00 XX 0X00 0x01 ir-cut Day mode ir-cut Night mode ◆Programming block diagram DSP Detection function: bool ImgDsp_Check(Viod) Camera power on Init end（36 32 35 0D 0A 49 6E 69 74 20 65 6E 64 0D 0A）？ Delay 2-3s began to send photo command Start taking photos Read one frame JPG images：bool CaputreImage(Void) Timeout Image Signalling:56 00 36 01 00 Return: 76 00 36 00 00 Signalling:56 00 34 01 00 Return: 76 00 34 00 00 Signalling:56 00 32 0C 00 0A 00 00 MH ML 00 00 KH KL XX XX Read the next data Receive:FF D9 Signalling:56 00 36 01 03 Return: 76 00 36 00 00 The end