Filter
Top Products
The Bfv API Functions
November 2009 29
Hereafter each of the line states is referred to by the descriptive part
of its name only (for example, LINE_STATE_IDLE is referred to as
IDLE).
The current state of the line is stored in the BTLINE structure. A
pointer to this structure is passed as an argument to nearly all Bfv
API entry points and is provided to the application by the
BfvLineAttach function.
A number of functions and interrupts serve as inputs to the BTLINE
structure and affect the transition to different line states. Other
functions check the current line state.
Some functions conditionally branch to other points in the code, and
some prevent inappropriate action from occurring, for example,
frequent checking for CONNECTED before attempting to transmit
data.
The following is a partial list of the functions and interrupts and the
line state they set:
FUNCTION LINE STATE
BfvLineAnswer Sets the state to CONNECTED.
BfvLineAttach Initializes the state to IDLE.
BfvLineOriginateCall Sets the state to CONNECTED or OFF_HOOK
depending on the results from call
progress monitoring.
BfvLineReset Resets the state to IDLE.
BfvLineTerminateCall Sets the state to IDLE.
INTERRUPTS LINE STATE
Answer tone detect Sets the state to CONNECTED.
Direction change Sets the state to TURNAROUND.
Disconnect Sets the state to IDLE.
Received FSK data Sets the state to AWAIT_TRAINING.
Ring detect Sets the state to RINGING.
Training Sets the state to FAX_MODE.