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Unibrain Fire-i 530/630/830 Operation Manual Page 49
SIO (RS232) TX Control Procedure Method II
STEP 1 Check TX buffer size by reading TBUF_ST of the Transmit_Buffer_Status_Control
register(Addr. : F2F220Ch)
If ((TBUF_ST == Buffer_Size_Inq) or (TBUF_TDRD ==1)) then TX is COMPLETE else TX is INCOMPLETE
TBUF_ST : Current TX Data buffer(Unit:byte) of the camera
TBUF_CNT : Read : Number of data transmitted by RS232 TX
Buffer_Size_Inq : Defined in Serial_Mode_Reg( Addr. : F2F22000h)
Ex) 20050000h : valid data buffer size = 20 number of data sent : 05
STEP 2 Write number of RS232 TX data to be set for TBUF_CNT at Transmit_Buffer_Status_Control
Register(Addr:F2F2200Ch)
TBUF_CNT can be configured by unit of byte.
The value of TBUF_CNT must be smaller than data written at SIO_Data_Register.
STEP 3 Write RS232 TX data set at TBUF_CNT to SIO_Data Register(Addr. : F2F22100h)
If (write data number > = TBUF_CNT)
{
RS232TX Start
Write Data number larger that TBUF_CNT is discarded.
For example if TBUF_CNT = 5 , in IEEE-1394 write is done by a unit of 4 bytes where 8 bytes shall be
written at SIO_Data_Register but only 5 bytes are transmitted and the 3 bytes remaining shall be
discarded.
}
STEP4 If there is data to be transmitted repeat from Step 1 .
Bit 0 ~ Bit 7 : 1
st
Data Bit 8 ~ Bit 15 : 2
nd
Data
Bit 16 ~ Bit 23 : 3
rd
Data Bit 24 ~ Bit 31 : 4
th
Data
Bit 0 : Msb Bit 31 : Lsb