FILE_READ Function Block

The FILE_READ function block is used to read data from a file on the SD memory card. A FileID is used to identify which file to read data from. FILE_SEEK may need to be used to move the file pointer to a position that has data.

Element Name	Element Type	Description
REQ	Input	Edge detected request to execute the function block.
FileID	Input	File identification number for the file to read from.
ReadAddr	Input	Address of the data to read.
Size	Input	Size of the data to read. If read data is an array, the number of elements equal to Size input will be read.
DONE	Output	Function block status for reading the file.
BUSY	Output	Function block is busy reading the file.
ReadSize	Output	The amount of data that has successfully been read.
STAT	Output	Outputs an error number if a problem occurs.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LM312-3