SX Video OSD Module Hitt Consulting

Transcription

1 SX Video OSD Module Hitt Consulting Rev A * Serial In Video Out 105 S Locust Street * 2400 baud serial input (8N1) Shiremanstown Pa * Compatible with NTSC video info@hittconsulting.com * 8 lines of 24 characters / 16 x 48 pixels * 3 Programmable character heights * Programmable vertical position by scanline * Programmable display time by frame (1/60 th sec)

2 SX VIDEO OSD MODULE DEBUG commands for the Basic Stamps, and the constants for DEBUG can be used. The Null (128) value is useful to send at startup just in case a multi-byte command (like CrsrXY) was send without the parameters. The next values sent would then be interpreted as the parameters for the CrsrXY command, instead of the commands intended. The Null value is simply ignored if received on it s own. VIDEO INPUT AND OUTPUT OVERVIEW The SX Video OSD Module is used to create text and low-resolution graphics on-top-of an input video signal. Popular uses include: time/date stamp, security info, status displays and demonstrations. The video module creates a display of 8 lines each consisting of 24 characters. Each character is 8 pixels wide and 8 pixels high. The module accepts serial data at 2400 baud or 240 characters per second. An entire screen of 192 characters takes less than 1 second. This makes fairly rapid display updates possible. SERIAL DATA FORMAT The serial data is received at a baud rate of N1. Character data is sent using standard ASCII codes. In other words on the Basic Stamp microntrollers a simple message might be: SEROUT SPin,Baud,[ Hello ] Also pixels (1/4 character size) can be turned on or off with the special plot and unplot serial commands. You only need to specify the location of the pixel on the screen. SEROUT Spin,Baud,[v_PlotXY, X, Y] COMMANDS Received data values from 16 to 127 and 144 to 255 are display characters. Values from 0 to 15 and 128 to 143 are commands. Some commands require additional data that is send immediately following the command. For example the CrsrXY command must be followed by the character for the X value then the character for the Y value CHR(2)+CHR(X)+CHR(Y). Commands for values from 0 to 15 are the same as the The video output must be connected to a video input. This is usually a yellow colored RCA jack on a TV, monitor, VCR or DVD player. Video inputs have an impedance of about 75 ohms, and this is needed to get the correct voltage from the module. SWITCHES There are two switches on the board. Switch 1 determines if the video background will be dimmed to make the text easier to see. Switch 2 determines if the serial input is inverted or true. Serial input is always N1 format. ON-BOARD VOLTAGE REGULATOR There is also an on-board voltage regulator. You can connect the Vin pin to a 5.0 to 7.5 volt supply. The module requires about 100 milliamps. Do NOT attempt to connect to the Vcc output of the Basic Stamps, they are not designed to supply the needed 100 milliamps of current. VIDEO OSD (OVERLAY) OR GENERATOR The SX Video OSD module will function as an On-Screen-Display when there is a video signal connected to the video in connector. When a video input is not recognized the module will switch to video generation mode. The module can be used as a video generator if needed. NOTE: The module uses the video signal (either from video in or it s own generated video signal) to time the serial communications. Therefore when the video input is not stable or when the module is switching modes the serial data may become corrupted. If there is any possibility that the video signal may become unstable, it is best to periodically erase and redraw the entire screen. Also note that if the module receives the FRAMES(141) command followed by a value other than 255, the module will not display until another FRAMES command is received, of the module is powered off and back on. It is recommended to send FRAMES,255 periodically to prevent this.

3 Power: Size: Controller: Display: Characters: SPECS 5.0 to 7.5VDC 100mA 2.0 x 1.5 (not including connectors) Ubicom SX48BD microcontroller operating at 50 MHz. 8 lines of 24 characters each Compatible with NTSC (USA) or PAL (Europe, Overlay ONLY) video signals. Vertical position adjustable. 224 including upper & lower case and inverse. 3 vertical character sizes. Serial Input to module that accepts serial data at 2400 baud, 8 data bits, 1 stop bit and no parity (2400-8N1). Depending on the setting of the INV/TRUE jumper will determine if the serial data must be inverted or true. The default setting is inverted which will be the case if the serial data is coming from a PC serial port. When sending data from the basic stamp, make sure the format matches the jumper setting. Gnd Power supply ground. This MUST also be connected to ground on the device sending the serial data to the module. Graphics: CN1 48 horizontal, 16 vertical (1/4 character blocks) SPECIAL FEATURES * Low Res graphics plot and unplot commands * Invert Screen command * Position text vertically by scanline * Display text for x video frames * No delays needed when sending data PIN FUNCTIONS Yellow RCA jack. This is the video output from the module. Connect this to the video input of your video display using an RCA cable. REGULATORY WARNINGS This device is NOT FCC approved. It is not in finished product form. It is strictly intended for experimental purposes only. If you wish to use these modules in an actual product (a nonexperimental capacity), the modules must first be designed into the product, then the whole product must be approved by the FCC. HEALTH WARNINGS This product contains lead, a chemical known by the state of CA to cause cancer and birth defects and other reproductive harm. CN2 Vin White RCA jack. This is the video input from a camera or other video source. Supply voltage input to regulator. Vin may be between 5.0 and 7.5 volts. This source must be able to supply 100milliamps of current. Demo programs and additional info can be found on the website

4 COMMANDS Commands from 0 to 15 are the same as the Basic Stamp(R) DEBUG commands. All parameters are sent as a single byte. CHR(X) or CHR$(X). VALUE NAME PARAMETERS DESCRIPTION 0 Cls (none) Clears the screen and moves cursor to 0,0 1 Home (none) Moves cursor to 0,0 2 CrsrXY (2) X,Y Moves cursor to specified coordinates 3 CrsrLf (none) Moves cursor 1 position to the left 4 CrsrRt (none) Moves cursor 1 position to the right 5 CrsrUp (none) Moves cursor 1 position upward 6 CrsrDn (none) Moves cursor 1 position downward 7 Ignored (none) Ignored 8 Bksp (none) Moves cursor 1 position to the left (destructive) 9 Tab (none) Moves cursor to next tab stop (0,8,16) 10 LF (none) Linefeed; Moves cursor down 1 line 11 ClrEol (none) Clears from cursor to end-of-line 12 ClrDn (none) Clears from cursor to end-of-screen 13 CR (none) Carriage Return; Moves cursor to start of next line 14 CrsrX (1) X Moves cursor to specified column 15 CrsrY (1) Y Moves cursor to specified row 128 Null (none) Ignored 129 InvOn (none) Turns on inverse mode 130 InvOff (none) Turns off inverse mode 131 InvScrn (none) Inverts the whole screen 132 PlotXY (2) X,Y Plots a point(1/4 char) at X(0..47),Y(0..15) 133 UnPlotXY (2) X,Y Unplots a point(1/4 char) at X(0..47),Y(0..15) 134 Outs (1) Sets pins on expansion connector 135 Version (none) Displays the firmware version letter 136 DecByte (1) Value Displays the next value in decimal 137 HexByte (1) Value Displays the next value in hexadecimal 138 Sound (2) [NOT USED] 139 Size (1) Size Set vertical size of text (0..2) 140 VertPos (1) Scanline Set the text vertical position on the screen 141 Frames (1) Frames [ RESERVED ] Display text for (1..254) frames 0=Off Immediately 255=Always on [ RESERVED ]

5 CHARACTER SET (+128 for Inverse)

6 Basic Stamp Example Programs =========================================== File... BouncingBall.BS2 Purpose... Demo for SX-Video OSD Module Author... Terry Hitt ... Started... Sept 4, 2005 =========================================== Stamp to Video Module Connections BS2 Video Module P Serial GND Gnd IF USING THE "Board of Education" SIMPLY PLUG THE 3-PIN CONNECTOR IN THE SERVO CONNECTOR LABELED "15" MAKE SURE SWITCH "2" IS OFF(RIGHT) FOR INVERTED SERIAL DATA {$STAMP BS2} {$PBASIC 2.5} #SELECT $STAMP #CASE BS2, BS2E, BS2PE T2400 CON 396 #CASE BS2SX, BS2P T2400 CON 1021 #ENDSELECT Inverted CON $4000 Baud CON T Inverted Video commands v_null CON 128 v_invon CON 129 v_invoff CON 130 v_invscrn CON 131 v_plotxy CON 132 v_unplotxy CON 133 v_out CON 134 v_version CON 135 v_decbyte CON 136 v_hexbyte CON 137 v_sound CON 138 v_size CON 139 v_vertpos CON 140 v_frames CON 141 Define I/O Pins Sout PIN 15 Define variables CurrX VAR Word CurrY VAR Word OldX VAR Word OldY VAR Word DirX VAR Word DirY VAR Word Cnt VAR Word Start of code Start: HIGH Sout PAUSE 100 SEROUT Sout,baud,[v_Null,v_Null,v_Null,v_Null, v_invoff, CLS, v_size, 2] FOR CurrX=0 TO 47 SEROUT Sout,baud,[v_PlotXY, CurrX, 0, v_plotxy, CurrX, 47] NEXT FOR CurrY=0 TO 15 SEROUT Sout,baud,[v_PlotXY, 0, CurrY, v_plotxy, 47, CurrY] NEXT

7 SEROUT Sout,baud,[CRSRXY, 1, 1, v_invon, "SX-Video", CRSRXY, 6, 3, v_invoff, "OSD Module", CRSRXY, 10, 5, v_invon, "Bouncing Ball"] PAUSE 5000 CurrX=15*2+10 CurrY=5*2+10 OldX=(CurrX-10)/2 OldY=(CurrY-10)/2 DirX=1 DirY=1 FOR Cnt=1 TO 1000 PAUSE 25 SEROUT Sout,baud,[v_UnPlotXY, OldX, OldY, v_plotxy, (CurrX-10)/2, (CurrY-10)/2] OldX=(CurrX-10)/2 OldY=(CurrY-10)/2 CurrX=CurrX+DirX CurrY=CurrY+DirY IF (CurrX < 12) OR (CurrX > 102) THEN DirX=-DirX CurrX=CurrX+DirX ENDIF IF (CurrY < 12) OR (CurrY > 38) THEN DirY=-DirY CurrY=CurrY+DirY ENDIF NEXT GOTO Start

8 ========================================================================= File... DS1307 DEMO.BS2 Purpose... DS1307 demo for SX-Video Overlay (OSD) Module Author... Terry Hitt, (I2C Portions from Jon Williams, Parallax) Started... Updated SEPT 2005 {$STAMP BS2} {$PBASIC 2.5} ========================================================================= -----[ Program Description ] Simple demo of the SX-Video Overlay (OSD) module using the DS1307 Tested using a BS2 on the NX1000/24 development board -----[ Revision History ] #SELECT $STAMP #CASE BS2, BS2E, BS2PE T2400 CON 396 #CASE BS2SX, BS2P T2400 CON 1021 #ENDSELECT Inverted CON $ [ I/O Definitions ] SDA PIN 0 I2C serial data line SCL PIN 1 I2C serial clock line SPin PIN 2 Serial output to OSD module -----[ Constants ] Ack CON 0 acknowledge bit Nak CON 1 no ack bit DS1307 CON %1101 << 4 Baud CON T Inverted VertPos CON 185 Vertical position on screen Video commands v_null CON 128 v_invon CON 129 v_invoff CON 130 v_invscrn CON 131 v_plotxy CON 132 v_unplotxy CON 133 v_out CON 134 For customized modules ONLY v_version CON 135 v_decbyte CON 136 v_hexbyte CON 137 v_sound CON 138 OSD Module does NOT generate sound v_size CON 139 v_vertpos CON 140 v_frames CON [ Variables ] slvaddr VAR Byte slave address devnum VAR Nib device number (0-3) addrlen VAR Nib 0, 1 or 2 devaddr VAR Word address in device i2cdata VAR Byte data to/from device i2cwork VAR Byte work byte for TX routine i2cack VAR Bit Ack bit from device idx VAR Nib secs VAR Byte DS1307 time registers

9 mins VAR Byte hrs VAR Byte day VAR Byte weekday date VAR Byte day in month, 1-31 month VAR Byte year VAR Byte control VAR Byte SQWV I/O control Cnt VAR Byte -----[ EEPROM Data ] [ Initialization ] Reset: slvaddr = DS1307 addrlen = 1 Setup: OUTPUT SPin PAUSE 100 SEROUT SPin, Baud, [v_null, v_null, v_null, CLS, v_size, 0, v_vertpos, VertPos, v_frames, 255] -----[ Program Code ] Main: Erase screen SEROUT SPin, Baud, [v_null, v_null, v_null, v_size, 0, v_vertpos, VertPos, v_frames, 255, CRSRXY, 0, 0, CLREOL, CR, CLREOL, CR, CLREOL, CR, CLREOL, CR, CLREOL, CR, CLREOL, CR, CLREOL, CR, " "] Update FOR Cnt=0 TO 50 GOSUB Get_Clock hrs = hrs & $3F SEROUT SPin, Baud, [CRSRXY, 7, 7, HEX2 month, "/", HEX2 date, "/", HEX2 year, " ", HEX2 hrs, ":", HEX2 mins, ":", HEX2 secs] PAUSE 100 NEXT GOTO Main END -----[ Subroutines ] Do a block read from clock registers Get_Clock: GOSUB I2C_Start i2cwork = slvaddr & % i2cwork = 0 GOSUB I2C_Start i2cwork = slvaddr % FOR idx = 0 TO 6 GOSUB I2C_RX_Byte secs(idx) = i2cwork NEXT GOSUB I2C_RX_Byte_Nak control = i2cwork GOSUB I2C_Stop send Start send slave ID (write) point at secs register send slave ID (read) read secs to year read control -----[ High Level I2C Subroutines] Random location read -- pass device slave address in "slvaddr" -- pass address bytes (0, 1 or 2) in "addrlen" -- register address passed in "devaddr" -- data byte read is returned in "i2cdata" Read_Byte: GOSUB I2C_Start IF (addrlen > 0) THEN i2cwork = slvaddr & % send Start send slave ID (write)

10 IF (i2cack = Nak) THEN Read_Byte wait until not busy IF (addrlen = 2) THEN i2cwork = devaddr.byte1 send word address (1) ENDIF i2cwork = devaddr.byte0 send word address (0) GOSUB I2C_Start ENDIF i2cwork = slvaddr % send slave ID (read) GOSUB I2C_RX_Byte_Nak GOSUB I2C_Stop i2cdata = i2cwork -----[ Low Level I2C Subroutines] *** Start Sequence *** I2C_Start: INPUT SDA INPUT SCL LOW SDA Clock_Hold: DO : LOOP UNTIL (SCL = 1) I2C start bit sequence wait for clock release *** Transmit Byte *** I2C_TX_Byte: SHIFTOUT SDA, SCL, MSBFIRST, [i2cwork\8] SHIFTIN SDA, SCL, MSBPRE, [i2cack\1] send byte to device get acknowledge bit *** Receive Byte *** I2C_RX_Byte_Nak: i2cack = Nak GOTO I2C_RX I2C_RX_Byte: i2cack = Ack I2C_RX: SHIFTIN SDA, SCL, MSBPRE, [i2cwork\8] SHIFTOUT SDA, SCL, LSBFIRST, [i2cack\1] no Ack = high Ack = low get byte from device send ack or nak *** Stop Sequence *** I2C_Stop: LOW SDA INPUT SCL INPUT SDA I2C stop bit sequence