Comedia.C328 UM_V4
Contents
1. sc OMedia Ltd ARARA RAJ C328 USER MANUAL nl gt PO PQ Q FO Q AQ Q DP What is the power range of the camera module The range is 3 0V 3 6V I want to establish the connection between a PC and the camera module Is there any configuration should be done To connection with a PC a RS 232 transceiver set up should be used as a communication interface I have sent an SYNC command to camera but it has no response How can I synchronize with the module Users should send the SYNC commands one by one continuously until receiving the ACK and SYNC commands from the module Normally 25 60 SYNC commands are required After that users should reply with an ACK command What is the baud rate to synchronize with the camera Will the baud rate change after SYNC C328 supports 7200 9600 14400 19200 28800 38400 57600 and 115200bps Users can synchronize with the camera at one of the baud rate above Once synchronizing with camera successfully the baud rate will not be changed until users change it with the Set Baud rate command When will the baud rate be changed after receiving the Set Baud rate command The baud rate will be changed after the module reply with the ACK command Users must use the new baud rate after this After sending Getpicture command to the camera what will the users receive After sending Getpicture command to the module users will receive an ACK2. a Data command AA 0A 01 XX YY ZZ telling you the image size and then the first package of image data How to use the image size returned Also how many packages must be received to get the captured image Users can use the image size to calculate the number of packages will be received according to the package size set The equation is shown in the following Number of package Image size Package size 6 According to the flow diagram the ACK command for the first package is AA OE 00 00 00 00 and that for the second one AA OE 00 00 01 00 Is the third one AA 0E 00 00 02 00 or AA 0E 00 00 01 01 For the third package it should be AA 0E 00 00 02 00 Those for the other package are shown in the following AA 0E 00 00 L L H H L L is the low byte of package ID H H is the high byte of package ID i e ID H H L Lin hex After synchronization I got the first picture with too low to too high luminance What s wrong with it After synchronization the camera needs a little time for AEC and AGC to be stable Users should wait for 1 2 seconds before capturing the first picture What are the formats of the uncompressed pictures The formats are shown in the following 2 bit Gray Scale 2 bit for Y only 4 bit Gray Scale 4 bit for Y only 8 bit Gray Scale 8 bit for Y only 12 bit Color 444 RGB 16 bit Color 565 RGB C328 JPEG Compression Module 13 2004 8 19
3. C328 User Manual Release Note 1 Jan 28 2004 official released v1 0 2 Feb 24 2004 official released v1 1 e Fix the definition of verify code e Fix the bug of unable jump to power save mode e Fix the incorrect connection speed after wake up from power save mode 3 Apr 24 2004 official released v2 0 Add auto baud rate detection e Add support of 9600bps 19200bps 38400bps e Disable the 8 bit colour for uncompressed picture 4 Apr 12 2005 official released v2 1 e Add command to change the light frequency between 50 60 Hz Add more descriptions of the resolution selection 5 Aug 19 2005 official released v3 0 Add description of the auto power mode Add FAQ section COMedia Ltd SS BKARARD A Rm 802 Nan Fung Ctr Castle Peak Rd Tsuen Wan NT Hong Kong Fax 852 2414 3050 Tel 852 2498 6248 Email sales comedia com hk k htto Awww comedia com h COMedia Ltd SS RAF RARA A C328 USER MANUAL General Description The C328 module is a highly integrated serial camera board that can be attached to a wireless or PDA host performing as a video camera or a JPEG compressed still camera It provides a serial interface RS 232 and JPEG compression engine to act as a low cost and low powered camera module for high resolution serial bus security system or PDA accessory applications OV CMOS OV528 VGA Image Compression Sensor Engine EEPROM C328 camera module Pro
4. Obh Picture Up Scale 02h Send Register Timeout Och Picture Scale Error 03h Command ID Error Odh Unexpected Reply 04h Picture Not Ready Ofh Send Picture Timeout 05h Transfer Package Number Error 10h Unexpected Command 06h Set Transfer Package Size Wrong Ith SRAM JPEG Type Error 07h Command Header Error FOh SRAM JPEG Size Error 08h Command Length Error Fih Picture Format Error 09h Send Picture Error F5h Picture Size Error Oah Send Command Error ffh 12 Light Frequency AA13h The host issues this command to change the light frequency of the C328 12 1 Light Frequency Type 50Hz 00h 60Hz Olh C328 JPEG Compression Module 2004 8 19 COMedia Ltd FAFRARZA I C328 USER MANUAL Command Protocol 1 SYNC Command SYNC er AA OD 00 00 00 00 O8 ACK C328 AA OE OD xx 00 00 SYNC AA OD 00 00 00 00 ACK AA OE OD xx 00 00 2 Make Connection with C328 Send the SYNC command at 14400bps until receiving ACK command from C328 usually an ACK command is receive after sending 25 times of SYNC command This must be done after power up SYNC AA OD 00 00 00 00 SYNC AA OD 00 00 00 00 SYNC l AA 0D 00 00 00 00 Max 60 times SYNC AA OD 00 00 00 00 ACK AA OE OD xx 00 00 SYNC AA OD 00 00 00 00 ACK AA OE OD xx 00 00 C328 JPEG Compression Module 8 2004 8 19 A COMedia Ltd SS R AARAA RAE C328 USER MANUAL 3 Initial Get Picture Snapshot Set Package Size Set Baudrate Reset and P
5. gram Figure 1 System block diagram Features gt VVVVV v gt Small in size low cost and low powered 3 3V camera module for high resolution serial bus security system or PDA accessory applications On board EEPROM provides a command based interface to external host via RS 232 UART 115 2Kbps for transferring JPEG still pictures or 160x128 preview 8bpp with 0 75fps On board OmniVision VGA color sensor Built in JPEG CODEC for different resolutions Built in down sampling clamping and windowing circuits for VGA QVGA 160x120 or 80x60 image resolutions Built in color conversion circuits for 2 bit gray 4 bir gray 8 bit gray 12 bit RGB 16 bit RGB or standard JPEG preview images No external DRAM required System Configuration 1 Camera Sensor The C328 module uses OmniVision VGA color digital CameraChips with an 8 bit YCbCr interface OV528 Serial Bridge The OV528 Serial Bridge is a JPEG CODEC embedded controller chip that can compress and transfer image data from CameraChips to external device The OV528 takes 8 bit YCbCr 422 progressive video data from an Sensor CameraChip 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 can achieve higher compression ratio and better image quality for various image resol
6. image data which is ready for transmitting out to the host Data Type Snapshot Picture Olh Preview Picture 02h JPEG Preview Picture 05h Length These three bytes represent the length of data of the Snapshot Picture Preview Picture or JPEG Preview Picture SYNC AAODh Either the host or the C328 can issue this command to make connection An ACK command must be sent out after receiving this command C328 JPEG Compression Module 6 2004 8 19 COMedia Ltd SS R AARAA RAR C328 USER MANUAL 10 ACK AA0Eh This command indicates the success of last operation After receiving any valid command ACK command must be sent out except when getting preview data The host can issue this command to request image data package with desired package ID after receiving Data command from C328 The host should send this command with package ID FOFOh after receiving a package to end the package transfer Note that the field command ID should be 00h when request image data package 10 1 Command ID The command with that ID is acknowledged by this command 10 2 ACK Counter No use 10 3 Package ID For acknowledging Data command these two bytes represent the requested package ID While for acknowledging other commands these two bytes are set to 00h 11 NAK AAOFh This command indicates corrupted transmission or unsupported features 11 1 NAK Counter No use 11 2 Error Number Picture Type Error Olh Parameter Error
7. meter2 Parameter3 Parameter4 Initial AAOlh 00h Color Type RAW JPEG Resolution Resolution Still image only Get Picture AA04h Picture Type 00h 00h 00h Snapshot AAOS5h Snapshot Type Skip Frame Skip Frame 00h Low Byte High Byte Set Package AAO6h 08h Package Size Package Size 00h Size Low Byte High Byte Set Baudrate AAO07h Ist Divider 2nd Divider 00h 00h Reset AAO8h Reset Type 00h 00h xxh Power Off AAO9h 00h 00h 00h 00h Data AAOAh Data Type Length Byte 0 Length Byte 1 Length Byte 2 SYNC AAODh 00h 00h 00h 00h ACK AAOEh Command ID ACK counter 00h Package 00h Package ID Byte 0 ID Byte 1 NAK AAOFh 00h NAK counter Error Number 00h Light AAI3h Frequency 00h 00h 00h Frequency Type If the parameter is OxFF the command is a special Reset command and the firmware responds to it immediately 1 initial AA01h The host issues this command to configure the preview image size and color type After receiving this command the module will send out an ACK command to the host if the configuration success Otherwise an NACK command will be sent out 1 1 Color Type C328 can support 7 different color types as follow 2 bit Gray Scale 4 bit Gray Scale 8 bit Gray Scale 12 bit Color 16 bit Color JPEG 1 2 Preview Resolution 80x60 160x120 1 3 JPEG Resolution Since the Embedded JPEG Code can support only multiple of 16 the JPEG preview mode can support following image sizes It is different from normal p
8. ower Off Command SYNC Get Picture Snapshot Set Package Size Set Baudrate Reset Power Off 4 Getting a Snapshot for RS232 Make sure connection is made before the following communication 4 1 JPEG Snapshot Picture eg 640x480 resolution Initial JPEG preview VGA AA 01 00 07 yy 07 yy 07 ACK AA OE 01 xx 00 00 Set Package Size 512 bytes size AA 06 08 00 02 00 ACK AA OE 06 xx 00 00 Snapshot compressed picture AA 05 00 00 00 00 ACK AA OE 05 xx 00 00 Get Picture snapshot picture AA 04 01 00 00 00 ACK AA OE 04 xx 00 00 Data snapshot picture ACK AA 0A 01 ere Te package ID 0000h AA 0E 00 00 00 00 Image Data Package 512 bytes ID 0000h ACK package ID 0001h AA OE 00 00 01 00 Image Data Package 512 bytes ID 0001h The Last Image Data Package ACK package ID FOFOh Note AA OE 00 00 FO FO xx yy Don t care Image size returned by C328 C328 JPEG Compression Module 9 2004 8 19 COMedia Ltd SS FAFRARZA I C328 USER MANUAL 4 2 Snapshot Picture uncompressed snapshot picture Initial preview VGA AA 01 00 06 07 zz ACK AA OE 01 xx 00 00 Snapshot uncompressed picture AA 05 01 00 00 00 ACK AA OE 05 xx 00 00 Get Picture snapshot picture AA 04 01 00 00 00 ACK AA OE 04 xx 00 00 Data snapshot picture AA 0A 01 Image Data whole picture AA OE OA xx 00 00 Note xx z
9. review mode 80x64 160x128 320x240 640x480 Olh 02h 03h 05h 06h 07h Olh 03h Olh 03h 05h 07h C328 JPEG Compression Module 2004 8 19 COMedia Ltd SS R AARAA RA C328 USER MANUAL 2 Get Picture AA04h The host gets a picture from C328 by sending this command 2 1 Picture Type Snapshot Picture Olh Preview Picture 02h JPEG Preview Picture 05h 3 Snapshot AA05h C328 keeps a single frame of JPEG still picture data in the buffer after receiving this command 3 1 Snapshot Type Compressed Picture 00h Uncompressed Picture Olh 3 2 Skip Frame Counter The number of dropped frames can be defined before compression occurs 0 keeps the current frame 1 captures the next frame and so forth 4 Set Package Size AAO6h The host issues this command to change the size of data package which is used to transmit JPEG image data from the C328 to the host This command should be issued before sending Snapshot command or Get Picture command to C328 It is noted that the size of the last package varies for different image 4 1 Package Size The default size is 64 bytes and the maximum size is 512 bytes ByteO ByteN ID Data Size Image Data Verify Code 2 bytes 2 bytes Package size 6 bytes 2 bytes Package Size _ ID gt Package ID starts from zero for an image Data Size gt Size of image data in the package Verify Code gt Error detection code equals to the lo
10. utions Program EEPROM A serial type program memory is built in for C328 to provide a set of user friendly command interfacing to external host C328 JPEG Compression Module 2 2004 8 19 COMedia Ltd ARAARA RD A C328 USER MANUAL Board Layout RS 232 RS 232 J1 EEPROM J1 3 3V Tx Rx GND 28mm OV Sensor OV528 Top View Bottom View Figure 2 C328 board layout and serial interface pin 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 A start bit is always 0 while a stop bit is always 1 LSB is sent out first and is right after the start bit lt q Single Byte Transmission p Uu y yy y y y y y y a S S amp F S ao S amp F S amp oO 40 KF NM BW BRN DAN TD Figure 3 RS 232 single byte timing diagram 2 Command Timing Diagram A single command consists of 6 continuous single byte RS 232 transmissions The following is an example of SYNC AA0D00000000h command lt 4 SYNC Command _ gt AAh i 0Dh r 00h a 00h r 00h 00h Single Byte Figure 4 RS 232 SYNC command timing diagram C328 JPEG Compression Module 3 2004 8 19 COMedia Ltd SS RAFRA RZ A C328 USER MANUAL Command Set The C328 module supports total 11 commands for interfacing to host as following Command ID Number Parameter Para
11. wer byte of sum of the whole package data except the verify code field The higher byte of this code is always zero i e verify code lowbyte sum byte 0 to byte N 2 Note As the transmission of uncompressed image is not in package mode it is not necessary to set the package size for uncompressed image C328 JPEG Compression Module 5 2004 8 19 gt COMedia Ltd SS RKAFRA RZ 3 C328 USER MANUAL 6 1 8 2 Set Baudrate AA07h Set the C328 baud rate by issuing this command As the module can auto detect the baud rate of the incoming command host can make connection with one of the following baud rate in the table The module will keep using the detected baud rate until physically power off Baudrate Divider Baudrate 14 7456MHz 2 x 2nd Divider 1 2 x 1st Divider 1 Baudrate 1 Divider 2 Divider Baudrate 1 Divider 2 Divider 7200 bps 28800 bps 9600 bps 38400 bps 14400 bps 57600 bps 19200 bps 115200 bps Reset AA08h The host reset C328 by issuing this command Reset Type 00h resets the whole system C328 will reboot and reset all registers and state machines 01h resets state machines only Power Off AA09h C328 will go into sleep mode after receiving this command SYNC command AAODh must be sent to wake up C328 for certain period until receiving ACK command from C328 Data AAOAh C328 issues this command for telling the host the type and the size of the
12. z Don t care Image size returned by C328 C328 JPEG Compression Module 10 2004 8 19 COMedia Ltd SS FAFRARZ I C328 USER MANUAL 5 Getting JPEG preview pictures video for RS232 Make sure connection is made before the following communication 5 1 JPEG Preview Picture Initial JPEG preview VGA AA 01 00 07 yy 07 ACK AA OE 01 xx 00 00 Set Package Size 512 bytes size AA 06 08 00 02 00 ACK AA 0E 06 xx 00 00 Get Picture JPEG preview picture AA 04 05 00 00 00 ACK AA OE 04 xx 00 00 Data JPEG preview picture ACK AA 0A 05 aera cite package ID 0000h AA OE 00 00 00 00 Image Data Package ACK package ID 0001h AA OE 00 00 01 00 Image Data Package 512 bytes ID 0001h The Last Image Data Package ACK package ID FOFOh Note AA OE 00 00 FO FO xx yy Don t care Image size returned by C328 C328 JPEG Compression Module 11 2004 8 19 u COMedia Ltd SS FAFRARZA I C328 USER MANUAL 5 2 Preview Picture uncompressed preview picture Initial preview VGA AA 01 00 06 07 zz ACK AA OE 01 xx 00 00 Get Picture preview picture AA 04 02 00 00 00 ACK AA OE 04 xx 00 00 Data preview picture 1 frame AA 0A 02 Image Data whole picture ACK AA OE 0A xx 00 00 Note xx zz Don t care Image size returned by C328 C328 JPEG Compression Module 12 2004 8 19 _ _ pa
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