Sensoray 614 Caption Overlay - Manual (Page 15)

III. Caption/Overlay Programming
As described in last section, the 614 FPGA internal registers including
Caption/Overlay control and programming registers, all are accessed by the
means of I2C bus.
Therefore, in Sensoray SDK-x14-win, an API function,
SN_WriteI2C ( I2C_Slave_Address, Bytes, Board ) is provided for the caption/overlay
programming purpose. In which:
I2C_Slave_Address = 0x60 (fixed I2C slave address for 614 FPGA), always;
Bytes is consisted of Register_Index+DataWord_HighByte+DataWord_LowByte;
Board is board instance.
At application level, a function,
USHORT fpga_reg_write( BOARD *b, UCHAR addr, USHORT data ) is provided for
caption/overlay control parameter load and/or caption character font or overlay
bitmap block data load.
Window/Field Position Control
Window/Field position control includes X-Start, X-Stop, Y-Start, and Y-Stop
parameter settings. With calling
fpga_reg_write ( board, address, data ), to
perform the setting load operation. In the function, the arguments:
board is board instance;
address is the register index of one of the following caption/overlay position
registers:
#define G_CAPWIN_X1START 0x10 // Caption window #1 X start.
#define G_CAPWIN_X2START 0x11 // Caption window #2 X start.
#define G_CAPWIN_X3START 0x12 // Caption window #3 X start.
#define G_CAPWIN_X4START 0x13 // Caption window #4 X start.
#define G_CAPWIN_X5START 0x14 // Caption window #5 X start.
#define G_CAPWIN_X6START 0x15 // Caption window #6 X start.
#define G_CAPWIN_X7START 0x16 // Caption window #7 X start.
#define G_CAPWIN_X8START 0x17 // Caption window #8 X start.
#define G_CAPWIN_X1STOP 0x18 // Caption window #1 X stop.
#define G_CAPWIN_X2STOP 0x19 // Caption window #2 X stop.
#define G_CAPWIN_X3STOP 0x1A // Caption window #3 X stop.
#define G_CAPWIN_X4STOP 0x1B // Caption window #4 X stop.
#define G_CAPWIN_X5STOP 0x1C // Caption window #5 X stop.
#define G_CAPWIN_X6STOP 0x1D // Caption window #6 X stop.
#define G_CAPWIN_X7STOP 0x1E // Caption window #7 X stop.
#define G_CAPWIN_X8STOP 0x1F // Caption window #8 X stop.
#define G_CAPWIN_Y1START 0x20 // Caption window #1 Y start.
#define G_CAPWIN_Y2START 0x21 // Caption window #2 Y start.
#define G_CAPWIN_Y3START 0x22 // Caption window #3 Y start.
#define G_CAPWIN_Y4START 0x23 // Caption window #4 Y start.
#define G_CAPWIN_Y5START 0x24 // Caption window #5 Y start.
#define G_CAPWIN_Y6START 0x25 // Caption window #6 Y start.
#define G_CAPWIN_Y7START 0x26 // Caption window #7 Y start.
#define G_CAPWIN_Y8START 0x27 // Caption window #8 Y start.
#define G_CAPWIN_Y1STOP 0x28 // Caption window #1 Y stop.
#define G_CAPWIN_Y2STOP 0x29 // Caption window #2 Y stop.
#define G_CAPWIN_Y3STOP 0x2A // Caption window #3 Y stop.
#define G_CAPWIN_Y4STOP 0x2B // Caption window #4 Y stop.
#define G_CAPWIN_Y5STOP 0x2C // Caption window #5 Y stop.