C328R User Manual
Contents
1. The JPEG CODEC can achieve higher compression ratio and better image quality for various image resolutions Program EEPROM A serial type program memory is built in for C328R to provide a set of user friendly command interfacing to external host C328R JPEG Compression Module 2 2007 6 28 C328R USER MANUAL Board Layout RS 232 RS 232 fmeee EEPROM r aeee 3 3V Tx Rx GND OV76xx OV528 Top View Bottom View Figure 2 C328R board layout and serial interface pin assignment 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 Single Byte Transmission AD w w vvv S gt YF E gt YF YF EBE OD 2 om NoU BNW DAN B 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 4 SYNC Command gt Single Byte Figure 4 RS 232 SYNC command timing diagram C328R JPEG Compression Module 3 2007 6 28 C328R USER MANUAL Command Set The C328R module supports total 11 commands for interfacing to host as following Command ID Number Parameterl Param2. 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 0E 00 00 01 00 Is the third one AA OE 00 00 02 00 or AA OE 00 00 01 01 For the third package it should be AA OE 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 C328R JPEG Compression Module 13 2007 6 28
3. 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 C328R JPEG Compression Module 5 2007 6 28 C328R USER MANUAL 5 1 6 1 8 1 8 2 Set Baudrate AA07h Set the C328R 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 Olh 28800 bps Olh 9600 bps Olh 38400 bps Olh 14400 bps Olh 57600 bps Olh 19200 bps Olh 115200 bps Olh Reset AA08h The host reset C328R by issuing this command Reset Type 00h resets the whole system C328R will reboot and reset all registers and state machines Olh resets state machines only Power Off AA0Qh C328R will go into sleep mode after receiving this command SYNC command AAODh must be sent to wake up C328R for certain period until receiving ACK command from C328R Data AAOAh C328R issues this command for telling the host the type and the size of the
4. C328R User Manual Release Note 1 28 June 2007 Official released for model number changed from C328 to C328R C328R USER MANUAL General Description The C328R is VGA camera module performs as 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 thru serial port VGA Image OV528 Sensor Compression Engine EEPROM C328R camera module Program Figure 1 System block diagram Features Small in size 20x28mm VGA resolution down sample to QVGA or CIF 3 3V operation Low power consumption 60mA User friendly commands to control the module UART interface of up to 115 2Kbps Auto detect baud rate and make connection to the host Power saving mode Various lens options System Configuration 1 Camera Sensor The C328R 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 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
5. 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 11h SRAM JPEG Type Error 07h Command Header Error FOh SRAM JPEG Size Error 08h Command Length Error Flh 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 C328R 12 1 Light Frequency Type 50Hz 00h 60Hz Olh C328R JPEG Compression Module 2007 6 28 C328R USER MANUAL Command Protocol 1 SYNC Command SYNC Host AA OD 00 00 00 00 Be ACK C328R AA OE OD xx 00 00 SYNC AA OD 00 00 00 00 ACK AA 0E OD xx 00 00 2 Make Connection with C328R Send the SYNC command at 14400bps until receiving ACK command from C328R 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 OD 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 C328R JPEG Compression Module 8 2007 6 28 C328R USER MANUAL 3 Initial Get Picture Snapshot Set Package Size Set Baudrate Reset and Power Off Command SYNC Get Picture Snapshot Set Package Size Set Baudrate Reset Power Off 4 Getting
6. 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 package ID 0000h AA OE 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 0E 00 00 FO FO xx yy Don t care Image size returned by C328R C328R JPEG Compression Module 9 2007 6 28 C328R 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 ZZ Don t care Image size returned by C328R C328R JPEG Compression Module 10 2007 6 28 C328R USER MANUAL 5 Getting JPEG pr
7. age sizes It is different from normal preview mode 80x64 160x128 320x240 640x480 Olh 03h 05h 07h C328R JPEG Compression Module 2007 6 28 C328R USER MANUAL 2 Get Picture AA04h The host gets a picture from C328R by sending this command 2 1 Picture Type Snapshot Picture Olh Preview Picture 02h JPEG Preview Picture 05h 3 Snapshot AA05h C328R 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 C328R to the host This command should be issued before sending Snapshot command or Get Picture command to C328R 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 t_ _ _ Package Sie _ 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 lower byte of sum of
8. eter2 Parameter3 Parameter4 Initial AAOIh 00h Color Type RAW JPEG Resolution Resolution Still image only Get Picture AAO04h 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 AAO7h 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 AA13h 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 AAO1h 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 Color Type C328R can support 6 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 Olh 02h 03h 05h 06h 07h Olh 03h Since the Embedded JPEG Code can support only multiple of 16 the JPEG preview mode can support following im
9. eview 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 OE 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 Po TENE 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 i ACK package ID FOFOh Note AA OE 00 00 FO F0 xx yy Don t care Image size returned by C328R C328R JPEG Compression Module 11 2007 6 28 C328R 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 OA xx 00 00 Note Xx ZZ Don t care Image size returned by C328R C328R JPEG Compression Module 12 2007 6 28 C328R USER MANUAL gt O 2 Q REE Q gt PO PQ Q PO Q 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
10. 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 C328R can issue this command to make connection An ACK command must be sent out after receiving this command C328R JPEG Compression Module 6 2007 6 28 C328R USER MANUAL 10 ACK AAOEh 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 C328R 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 Obh Picture Up Scale 02h Send
11. 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 ACK 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
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