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ADV7619 API I2C Field Read/Write

Question asked by hkhan@evertz.com on Oct 15, 2014
Latest reply on Oct 17, 2014 by Poornima

Hi,

 

I am using provided API which contains following function that has to be implemented by application designer. Can someone explain what these two statement means?

      "Set to 0 if FieldVal is in correct position of the reg"

      "If FieldVal is already in the correct position"

 

BitPos is passed in as a parameter so I can't imagine a scenario where user would ignore it by setting it to 0.

 

 

 

 

/*============================================================================

* Write up to 8-bit field to a single 8-bit register

*              ________  

* Example     |___****_|  Mask = 0x1E     BitPos = 1

*

* Entry:   DevAddr = Device Address

*          RegAddr = 8-bit register address

*          Mask    = Field mask

*          BitPos  = Field LSBit position in the register (0-7)

*                    Set to 0 if FieldVal is in correct position of the reg

*          FieldVal= Value (in the LSBits) of the field to be written

*                    If FieldVal is already in the correct position (i.e.,

*                    does not need to be shifted,) set BitPos to 0

*

* Return:  None

*

*===========================================================================*/

void ATV_I2CWriteField8 (UCHAR DevAddr, UCHAR RegAddr, UCHAR Mask,

                         UCHAR BitPos, UCHAR FieldVal)

{

}

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